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WO2020195004A1 - Motor, rotary wing device, and unmanned flying body - Google Patents
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WO2020195004A1 - Motor, rotary wing device, and unmanned flying body - Google Patents

Motor, rotary wing device, and unmanned flying body Download PDF

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Publication number
WO2020195004A1
WO2020195004A1 PCT/JP2020/000563 JP2020000563W WO2020195004A1 WO 2020195004 A1 WO2020195004 A1 WO 2020195004A1 JP 2020000563 W JP2020000563 W JP 2020000563W WO 2020195004 A1 WO2020195004 A1 WO 2020195004A1
Authority
WO
WIPO (PCT)
Prior art keywords
fins
stator
lattice structure
motor
radial
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/000563
Other languages
French (fr)
Japanese (ja)
Inventor
松田　和敏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Corp
Original Assignee
Nidec Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nidec Corp filed Critical Nidec Corp
Priority to JP2021508096A priority Critical patent/JPWO2020195004A1/ja
Priority to CN202090000454.8U priority patent/CN217335290U/en
Publication of WO2020195004A1 publication Critical patent/WO2020195004A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C27/00—Rotorcraft; Rotors peculiar thereto
    • B64C27/04—Helicopters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U30/00—Means for producing lift; Empennages; Arrangements thereof
    • B64U30/20—Rotors; Rotor supports
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U10/00—Type of UAV
    • B64U10/10—Rotorcrafts
    • B64U10/13—Flying platforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U20/00—Constructional aspects of UAVs
    • B64U20/90—Cooling
    • B64U20/94—Cooling of rotors or rotor motors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/40—Weight reduction

Definitions

  • the present invention relates to a motor, a rotorcraft, and an unmanned aerial vehicle.
  • Patent Document 1 describes a motor mounted on an unmanned aerial vehicle as such a motor.
  • the heat of the motor is easily released to the outside through the fins.
  • the number of fins that can be arranged in the housing there is a problem in further improving heat dissipation.
  • one of the objects of the present invention is to provide a motor, a rotary wing device, and an unmanned aerial vehicle having a structure capable of improving heat dissipation.
  • One aspect of the motor of the present invention includes a rotor that can rotate about a central axis, a stator that faces the rotor in the radial direction through a gap, and a stator holding member that holds the stator.
  • the stator holding member has a plurality of outer fins provided on the outer surface of the stator holding member. At least a part of the plurality of outer fins has a lattice structure.
  • One aspect of the rotary wing device of the present invention includes the above motor.
  • One aspect of the unmanned aerial vehicle of the present invention includes the above rotary wing device.
  • the heat dissipation of the motor can be improved.
  • FIG. 1 is a perspective view showing an unmanned aerial vehicle according to the first embodiment.
  • FIG. 2 is a perspective view showing the rotary wing device of the first embodiment.
  • FIG. 3 is a cross-sectional view showing the rotary wing device of the first embodiment.
  • FIG. 4 is a perspective view showing a part of the radial fins of the first embodiment.
  • FIG. 5 is a cross-sectional view showing a part of the motor of the modified example in the first embodiment.
  • FIG. 6 is a cross-sectional view showing a part of the rotary wing device according to the second embodiment.
  • the Z-axis direction shown in each figure is a vertical direction in which the positive side is the "upper side” and the negative side is the “lower side”.
  • the central axis J appropriately shown in each figure is a virtual line that is parallel to the Z-axis direction and extends in the vertical direction.
  • the axial direction of the central axis J that is, the direction parallel to the vertical direction
  • the radial direction centered on the central axis J is simply referred to as "radial direction”.
  • the circumferential direction centered on is simply called the "circumferential direction”.
  • the upper side corresponds to one side in the axial direction
  • the lower side corresponds to the other side in the axial direction.
  • the vertical direction, the upper side, and the lower side are names for simply explaining the arrangement relationship of each part, and the actual arrangement relationship, etc. is an arrangement relationship other than the arrangement relationship, etc. indicated by these names. You may.
  • extending in the axial direction includes not only the case of extending in the strict axial direction but also the case of extending in a direction inclined within a range of less than 45 ° with respect to the axial direction.
  • extending in the radial direction means that in addition to the case where the "extending in the radial direction" is strictly radial, that is, in the direction perpendicular to the axial direction, the term “extends in the radial direction” is tilted in a range of less than 45 ° with respect to the radial direction. Including the case of extending in the direction.
  • the unmanned aerial vehicle 1000 of the present embodiment includes a main body 1100, an image pickup device 1200, and a rotary wing device 1.
  • the image pickup device 1200 and the rotary wing device 1 are attached to the main body 1100.
  • the rotary wing device 1 is a device that generates the propulsive force of the unmanned aerial vehicle 1000.
  • a plurality of rotary blade devices 1 are provided. For example, four rotor devices 1 are provided.
  • the rotary blade device 1 includes a motor 10, a propeller 2, and a fan 75.
  • the motor 10 is an inner rotor type motor.
  • the motor 10 includes a housing 11, a rotor 20, a stator 30, bearings 23 and 24, a bus bar holder 50, a bus bar 51, a circuit board 80, and a hall sensor 81.
  • the housing 11 internally houses the rotor 20, the stator 30, the bearings 23, 24, the bus bar holder 50, the bus bar 51, the circuit board 80, and the hall sensor 81.
  • the housing 11 corresponds to a stator holding member.
  • the rotor 20 can rotate about the central axis J.
  • the rotor 20 includes a shaft 21, a rotor main body 22, and a propeller mounting portion 70.
  • the shaft 21 is arranged along the central axis J.
  • the shaft 21 has a columnar shape centered on the central axis J.
  • the shaft 21 is rotatably supported around the central axis J by bearings 23 and 24.
  • the upper end of the shaft 21 projects radially inside the top wall portion 11a of the housing 11, which will be described later, and inside the holding portion 11c, and protrudes above the housing 11.
  • the lower end of the shaft 21 is covered from below by a bearing holder 40, which will be described later.
  • the rotor body 22 is fixed to the shaft 21.
  • the rotor main body 22 has a rotor core 22a fixed to the outer peripheral surface of the shaft 21 and a rotor magnet 22b fixed to the outer peripheral surface of the rotor core 22a.
  • the propeller mounting portion 70 is provided on a portion of the shaft 21 located above the portion where the rotor body 22 is fixed. In the present embodiment, the propeller mounting portion 70 is provided on a portion of the shaft 21 that protrudes upward from the housing 11. More specifically, the propeller mounting portion 70 is fixed to the upper end of the shaft 21.
  • the propeller mounting portion 70 has an attachment member 71 connected to the shaft 21 and a connecting member 72 fixed to the upper side of the attachment member 71.
  • the attachment member 71 is provided on a cylindrical shaft portion 71a extending in the axial direction along the shaft 21, a flange portion 71b extending radially outward from the outer peripheral surface of the shaft portion 71a, and a radially outer end portion of the flange portion 71b. It has a cylindrical tubular portion 71c to be fixed.
  • a fan 75 is fixed to the tubular portion 71c.
  • the fan 75 has a plurality of blades 75a extending radially outward from the outer peripheral surface of the tubular portion 71c.
  • the fan 75 is located between the propeller 2 and the top wall portion 11a described later in the axial direction.
  • the fan 75 is an axial fan that blows air in the axial direction.
  • the attachment member 71 and the fan 75 are manufactured by insert molding.
  • the shaft portion 71a and the flange portion 71b are single metal members.
  • the tubular portion 71c and the fan 75 are a part of a single resin member.
  • the outer diameter of the fan 75 is smaller than the outer diameter of the propeller 2. With this configuration, interference between the propeller 2 and the fan 75 can be suppressed. Further, it is possible to suppress an increase in the weight of the rotary blade device 1.
  • the connecting member 72 is fixed to the upper surface of the attachment member 71.
  • the connecting member 72 is a disk-shaped member, and is fixed to the attachment member 71 with screws.
  • the propeller 2 is fixed to the upper surface of the connecting member 72 with screws. As a result, the propeller 2 is detachably attached to the propeller attachment portion 70.
  • the propeller 2 has a hub 2a located at the center in the axial direction and two blades 2b and 2c extending radially outward from the hub 2a.
  • the hub 2a has a flat plate shape with upper and lower surfaces flat.
  • the hub 2a has a through hole that penetrates in the axial direction.
  • the propeller 2 is fixed to the connecting member 72 by a screw passed through the through hole of the hub 2a.
  • the stator 30 faces the rotor 20 in the radial direction through a gap.
  • the stator 30 surrounds the rotor 20 on the radial outer side of the rotor 20.
  • the stator 30 has a stator core 31, an insulator 34, and a plurality of coils 35.
  • the stator core 31 is an annular shape that surrounds the rotor body 22 on the radial outer side of the rotor body 22.
  • the stator core 31 has a core back 32 and a plurality of teeth 33.
  • the core back 32 is an annular shape centered on the central axis J.
  • the teeth 33 project radially inward from the core back 32.
  • the plurality of teeth 33 are arranged at equal intervals along the circumferential direction.
  • the insulator 34 is a member that insulates the coil 35 and the stator core 31.
  • the insulator 34 is attached to each of the plurality of teeth 33.
  • the plurality of coils 35 are attached to each of the plurality of teeth 33 via the insulator 34.
  • the coil 35 is resin-molded together with, for example, the stator core 31 and the insulator 34.
  • the upper end surface of the mold resin comes into contact with the lower surface of the top wall portion 11a, which will be described later. That is, the coil 35 and the top wall portion 11a are thermally connected by the mold resin. Part of the heat generated in the coil 35 is transferred to the axial fins 16 described later via the resin mold and the top wall portion 11a, and is dissipated from the axial fins 16.
  • the bus bar holder 50 is arranged below the stator 30.
  • the bus bar holder 50 holds a plurality of bus bars 51.
  • the bus bar 51 is connected to leader wires extending from the plurality of coils 35.
  • the circuit board 80 has a plate shape that expands in the radial direction.
  • the circuit board 80 is arranged below the stator 30. In the present embodiment, the circuit board 80 is arranged outside the holding portion 41 described later in the radial direction.
  • the Hall sensor 81 is attached to the upper surface of the circuit board 80. The Hall sensor 81 detects the magnetic field of the rotor magnet 22b. Although not shown, a plurality of Hall sensors 81 are provided along the circumferential direction.
  • the housing 11 has a top wall portion 11a, a tubular portion 11b, a holding portion 11c, a bottom wall portion 11d, and a bearing holder 40.
  • the top wall portion 11a, the tubular portion 11b, and the holding portion 11c are a part of the same single member. That is, the top wall portion 11a, the tubular portion 11b, and the holding portion 11c are integrally molded.
  • the bottom wall portion 11d and the bearing holder 40 are separate members from the single member including the top wall portion 11a, the tubular portion 11b, and the holding portion 11c, and are fixed to the single member.
  • the bottom wall portion 11d and the bearing holder 40 are separate members from each other.
  • the top wall portion 11a is located above the stator 30 and covers the upper side of the stator 30.
  • the top wall portion 11a is located below the propeller 2 and the fan 75.
  • the top wall portion 11a faces the fan 75 in the axial direction via a gap.
  • the top wall portion 11a has an annular plate shape centered on the central axis J.
  • the tubular portion 11b extends downward from the radial outer peripheral edge portion of the top wall portion 11a.
  • the tubular portion 11b has a cylindrical shape that opens downward with the central axis J as the center.
  • the stator 30 is fixed to the inner peripheral surface of the tubular portion 11b. As a result, the housing 11 holds the stator 30.
  • the holding portion 11c projects upward from the radial inner peripheral edge portion of the top wall portion 11a.
  • the bearing 23 is held inside the holding portion 11c in the radial direction.
  • the bottom wall portion 11d is fixed to the lower end of the tubular portion 11b.
  • the bottom wall portion 11d projects radially inward from the lower end of the tubular portion 11b.
  • the bottom wall portion 11d is located below the stator 30 and covers the underside of the stator 30.
  • the bottom wall portion 11d has an annular plate shape centered on the central axis J.
  • the radial outer peripheral edge of the bottom wall portion 11d is fixed to the lower end of the tubular portion 11b, for example, with a screw.
  • the bearing holder 40 is fixed to the opening inside the bottom wall portion 11d in the radial direction.
  • the bearing holder 40 closes the radial inner opening of the bottom wall portion 11d from below.
  • the bearing holder 40 covers the rotor body 22 from below.
  • the bearing holder 40 has a cylindrical holding portion 41 that opens upward.
  • the bearing 24 is held by the holding portion 41.
  • the housing 11 has a plurality of outer fins 14.
  • the plurality of outer fins 14 are provided on the outer surface of the housing 11.
  • the outer surface of the housing 11 includes an upper surface of the top wall portion 11a, an outer peripheral surface of the tubular portion 11b, a lower surface of the bottom wall portion 11d, and a lower surface of the bearing holder 40.
  • the plurality of outer fins 14 may be integrally molded with other parts of the housing 11, or may be a separate member from the other parts of the housing 11 and may be fixed to the other parts.
  • the plurality of outer fins 14 include a plurality of radial fins 15 and a plurality of axial fins 16.
  • the plurality of radial fins 15 are provided on the outer peripheral surface of the housing 11, that is, the outer peripheral surface of the tubular portion 11b. As shown in FIG. 2, the plurality of radial fins 15 are arranged so as to be spaced apart from each other along the circumferential direction. In the present embodiment, the plurality of radial fins 15 are arranged at equal intervals over one circumference along the circumferential direction.
  • the radial fin 15 has, for example, a plate shape in which the plate surface faces the circumferential direction. The radial fin 15 extends axially from the upper end to the lower end of the tubular portion 11b.
  • the plurality of radial fins 15 has a lattice structure. That is, at least a part of the plurality of outer fins 14 has a lattice structure.
  • the lattice structure is a structure in which a plurality of beams are combined in a grid pattern.
  • the radial fin 15 of the present embodiment has a lattice structure in which a plurality of beams 15p are combined in a grid pattern.
  • the lattice structure is made, for example, by a three-dimensional modeling machine.
  • At least a part of a plurality of fins has a lattice structure means that at least a part of one fin has a lattice structure, and some of the plurality of fins may have a lattice structure.
  • the fins do not have to have a lattice structure, and one fin may include a portion having a lattice structure and a portion not having a lattice structure.
  • all the radial fins 15 of the plurality of radial fins 15 have a lattice structure, and the entire radial fins 15 have a lattice structure.
  • the surface area can be larger than that of a solid member having the same outer shape. Therefore, by forming at least a part of the plurality of outer fins 14 provided on the outer surface of the housing 11 into a lattice structure, the surface area of the outer fins 14 can be increased and the amount of heat released from the outer fins 14 is increased. Can be made to.
  • the air sent to the lattice structure easily passes through the gap between the beams and becomes turbulent.
  • the air flow tends to be turbulent due to the passage of air between the beams 15p shown in FIG.
  • Turbulent flow has a larger heat transfer coefficient than laminar flow.
  • the heat from the outer fin 14 is easily transferred to the air sent to the lattice structure, and the amount of heat released from the outer fin 14 can be further increased.
  • the heat dissipation of the motor 10 can be improved.
  • the air flowing along the surface of the outer fin 14 is dissipated from the outer fin 14, so that the temperature rises.
  • the temperature of the air flowing along the surface of the outer fin 14 varies in the region between the surface of the outer fin 14 and a predetermined distance. This region is called the temperature boundary layer. That is, the heat of the outer fin 14 is released to the air passing through the temperature boundary layer of the outer fin 14.
  • the heat released to the air from the one outer fin 14 forms the temperature boundary layer. It is transmitted to the other outer fin 14 via the passing air.
  • the heat from the outer fins 14 is less likely to be released to the outside of the motor 10, and the heat dissipation of the motor 10 may not be sufficiently improved. Therefore, the outer fins 14 need to be arranged apart from each other above the temperature boundary layer. Therefore, there is a limit to the number of outer fins 14 that can be arranged on the outer surface of the housing 11.
  • the present embodiment by forming at least a part of the outer fins 14 into a lattice structure, the total amount of heat radiated by the plurality of outer fins 14 is improved without increasing the number of the outer fins 14. it can. Therefore, even when the outer fins 14 are arranged as much as possible with respect to the housing 11, the heat dissipation of the motor 10 can be further improved.
  • the lattice structure is a structure that can maintain the same strength as a solid member having the same outer shape. Therefore, the strength of the outer fin 14 can be maintained even if at least a part of the outer fin 14 has a lattice structure to improve the surface area. Therefore, it is possible to prevent the outer fins 14 from being damaged while increasing the surface area of the outer fins 14 to improve the heat dissipation. Also, the lattice structure is lighter than a solid member having the same outer shape. Therefore, the weight of the entire motor 10 can be reduced.
  • At least a part of the plurality of radial fins 15 provided on the outer peripheral surface of the housing 11 that houses the rotor 20 and the stator 30 has a lattice structure. Therefore, the amount of heat released from the radial fins 15 can be increased. As a result, the heat from the tubular portion 11b to which the stator 30 is fixed can be suitably released to the outside by the radial fins 15. Therefore, the heat dissipation of the motor 10 can be further improved.
  • a propeller mounting portion 70 to which the propeller 2 is mounted is provided at a portion of the shaft 21 that protrudes upward from the housing 11. Therefore, as the propeller 2 rotates, air flows downward from the propeller 2 and air is sent to the housing 11. As a result, air is sent to the radial fins 15 provided on the outer peripheral surface of the housing 11, and heat can be suitably released from the radial fins 15. Therefore, the heat dissipation of the motor 10 can be further improved.
  • the plurality of axial fins 16 are provided on the upper surface of the housing 11, that is, the upper surface of the top wall portion 11a.
  • the plurality of axial fins 16 project upward from the upper surface of the top wall portion 11a.
  • the axial fin 16 is, for example, cylindrical.
  • the region in which the plurality of axial fins 16 are arranged is an annular shape that surrounds the central axis J in the circumferential direction.
  • the plurality of axial fins 16 do not have a lattice structure, unlike the radial fins 15. That is, in the present embodiment, only some of the outer fins 14 of the plurality of outer fins 14 have a lattice structure.
  • At least one of the plurality of radial fins 115 has a first portion 115a and a second portion 115b.
  • each of all radial fins 115 has a first portion 115a and a second portion 115b.
  • the first portion 115a is an upper portion of the radial fin 115.
  • the first portion 115a is located on the radial outer side of the stator core 31.
  • the first portion 115a has a lattice structure.
  • the second portion 115b is connected to the lower side of the first portion 115a.
  • the second portion 115b is a lower portion of the radial fin 115.
  • the second portion 115b is located below the stator core 31.
  • the axial dimension of the second portion 115b is smaller than the axial dimension of the first portion 115a.
  • the second part 115b is not a lattice structure but a solid plate-like part. That is, the second portion 115b has a non-lattice structure.
  • the “non-lattice structure” may be any structure other than the lattice structure.
  • the air sent from the propeller 2 to the lower side flows from the upper side to the lower side between the radial fins 115 adjacent to each other in the circumferential direction.
  • the temperature of the air flowing along the radial fins 115 becomes higher toward the lower side.
  • the temperature of the air flowing along the second portion 115b located on the lower side of the radial fins 115 becomes relatively high, and heat is released from the radial fins 115 to the air flowing along the second portion 115b. It becomes difficult to be done. Therefore, the second portion 115b contributes less to the improvement of heat dissipation of the motor 110 than the first portion 115a.
  • the amount of heat emitted from the radial fins 115 can be suitably increased by forming the first portion 115a with a lattice structure, and the heat dissipation of the motor 110 can be improved. It can be improved suitably. Since the second portion 115b does not have a lattice structure, a part of the radial fins 115 does not have to have a lattice structure, so that the manufacturing cost of the radial fins 115 can be reduced. Therefore, the manufacturing cost of the motor 110 can be reduced while improving the heat dissipation of the motor 110.
  • the stator core 231 of the stator 230 has a plurality of first groove portions 232a extending in the axial direction on the outer peripheral surface of the core back 232.
  • the housing 211 has a plurality of second groove portions 211f extending in the axial direction on the inner peripheral surface of the tubular portion 211b.
  • the plurality of first groove portions 232a and the plurality of second groove portions 211f are arranged at intervals along the circumferential direction.
  • the first groove portion 232a and the second groove portion 211f are arranged so as to face each other in the radial direction.
  • the housing 211 has a plurality of outer peripheral flow paths 261 each including a first groove portion 232a and a second groove portion 211f.
  • the holding portion 211c of the housing 211 has a plurality of through holes 211e that penetrate the holding portion 211c in the axial direction.
  • the plurality of axial fins 216 has a lattice structure. Therefore, the amount of heat that can be released by the axial fins 216 can be increased. As a result, the heat dissipation of the motor 210 can be improved.
  • all of the axial fins 216 have a lattice structure.
  • the axial fins 216 have a rectangular plate shape protruding upward from the upper surface of the top wall portion 11a. The plate surface of the axial fin 216 faces the circumferential direction. Axial fins 216 extend radially. Although not shown, the plurality of axial fins 216 are arranged at equal intervals along the circumferential direction.
  • the housing 211 has a sealing member 214.
  • the sealing member 214 seals an opening facing inward in the radial direction between adjacent teeth 33.
  • the sealing member 214 includes a plurality of pillars 214a extending in the axial direction at the inner peripheral end of the stator 230, an upper annular portion 214b connected to the upper ends of the plurality of pillars 214a, and a lower side connected to the lower ends of the plurality of pillars 214a. It has an annular portion 214c and.
  • the upper annular portion 214b and the lower annular portion 214c are annular around the central axis J. The upper end of the upper annular portion 214b comes into contact with the lower surface of the top wall portion 11a.
  • the lower end of the lower annular portion 214c contacts the upper surface of the bottom wall portion 211d.
  • the plurality of pillar portions 214a are located between adjacent teeth 33 in the circumferential direction.
  • the rotor 20 is arranged inside the sealing member 214 in the radial direction.
  • the housing 211 has a closed chamber 260 in which the coil 35 is housed.
  • the closed chamber 260 is surrounded by a top wall portion 11a, a tubular portion 211b, a bottom wall portion 211d, and a sealing member 214.
  • the cooling medium CM is housed in the closed chamber 260.
  • the cooling medium CM is, for example, a fluorine-based inert liquid.
  • the cooling medium CM has, for example, insulating properties.
  • the cooling medium CM can directly cool the coil 35 housed in the closed chamber 260. As a result, the cooling efficiency of the stator 230 can be improved.
  • the entire inside of the closed chamber 260 is filled with the cooling medium CM.
  • the closed chamber 260 has the above-mentioned outer peripheral side flow path 261, inner peripheral side flow path 262, upper flow path 263, and lower flow path 264.
  • the inner peripheral side flow path 262 is surrounded by the teeth 33 adjacent to each other in the circumferential direction and the pillar portion 214a of the sealing member 214.
  • the inner peripheral side flow path 262 extends along the axial direction and penetrates the stator 230 in the axial direction.
  • the upper flow path 263 is provided between the stator 230 and the top wall portion 11a.
  • the upper flow path 263 is connected to the upper ends of the plurality of outer peripheral side flow paths 261 and the upper ends of the plurality of inner peripheral side flow paths 262.
  • the lower flow path 264 is provided between the stator 230 and the bottom wall portion 211d.
  • the lower flow path 264 is connected to the lower ends of the plurality of outer peripheral side flow paths 261 and the lower ends of the plurality of inner peripheral side flow paths 262.
  • the housing 211 of the present embodiment has a plurality of inner fins 217 provided on the inner side surface of the closed chamber 260.
  • the inner fin 217 protrudes downward from the lower surface of the top wall portion 11a.
  • the inner fin 217 has a plate shape with the plate surface facing in the circumferential direction.
  • the inner fin 217 extends radially.
  • the plurality of inner fins 217 are arranged at equal intervals along the circumferential direction.
  • At least a part of the plurality of inner fins 217 has a lattice structure. Therefore, the surface area of the inner fin 217 can be increased, and the heat of the coil 35 can be easily absorbed by the inner fin 217 via the cooling medium CM housed in the closed chamber 260. As a result, the heat of the coil 35 released to the cooling medium CM is easily transferred to the housing 211 via the inner fins 217, and is easily released to the outside of the housing 211. Therefore, the heat dissipation of the motor 210 can be further improved.
  • the axial fins 216 are provided on the upper surface of the top wall portion 11a, the heat absorbed by the inner fins 217 into the housing 211 is more likely to be released to the outside of the housing 211 via the axial fins 216. ..
  • all the inner fins 217 have a lattice structure. Therefore, the heat of the coil 35 released to the cooling medium CM can be more easily transferred to the housing 211.
  • the fan 275 circulates cooling air inside the motor 210.
  • the fan 275 is a centrifugal fan. Due to the rotation of the fan 275, the air above the motor 210 is blown out in the radial direction, so that the pressure in the vicinity of the bearing 23 on the radial inside of the fan 275 becomes low. As a result, the air in the lower part of the motor 210 passes around the rotor 20 and moves to the through hole 211e. Therefore, the rotor device 201 has an air flow path that passes through the inside of the motor 210 and exits radially outward of the fan 275. Therefore, the stator 230 can be cooled from the inside in the radial direction by the air passing through the distribution path.
  • the air blown out radially outward by the fan 275 passes through the axial fins 216. Therefore, heat can be suitably released from the axial fins 216 to the air blown outward in the radial direction by the fan 275. As a result, the heat dissipation of the motor 210 can be further improved.
  • the present invention is not limited to the above-described embodiment, and the following configurations can also be adopted.
  • the lattice structure is not particularly limited as long as it is a structure in which beams are combined in a grid pattern, and may be a structure other than the structure shown in FIG.
  • a lattice structure may not be provided on some of the outer fins among the plurality of outer fins.
  • the radial fins 15 having a lattice structure and the radial fins 15 having no lattice structure may be alternately arranged along the circumferential direction.
  • at least a part of the axial fins 16 may have a lattice structure.
  • the outer diameter of the axial fin 16 may be increased to some extent to facilitate the lattice structure. Further, in this case, the axial fin 16 may have a cylindrical shape, for example. By forming at least a part of the axial fins 16 in a lattice structure, the heat dissipation of the motor 10 can be further improved.
  • the plurality of outer fins may include outer fins having different lattice structures from each other.
  • the plurality of inner fins may include inner fins having different lattice structures from each other.
  • the different lattice structures are, for example, lattice structures having different sizes of gaps between beams.
  • the shapes of the outer fins and the inner fins are not particularly limited, and may be shapes other than the shapes of the above-described embodiments.
  • the stator holding member is a housing, but the present invention is not limited to this.
  • the stator holding member may be any member that holds the stator.
  • the motor is an inner rotor type motor, but the motor is not limited to this.
  • the motor may be an outer rotor type motor.
  • the stator holding member may be a bracket or the like that holds the stator.
  • the outer surface of the stator holding member may be a surface capable of releasing heat to the outside of the motor, and includes a surface facing the outside of the motor and the like.
  • the stator holding member is a bracket and the bracket holds the stator on the upper side, the outer surface of the stator holding member includes the lower surface of the bracket.
  • the use of the motor, the use of the rotorcraft, and the use of the unmanned aerial vehicle are not particularly limited.
  • the motor may be a motor mounted on a motor other than the rotary wing device, or may be a motor mounted on a motor other than the unmanned aerial vehicle.
  • the rotary wing device may be a rotary wing device mounted on a vehicle other than the unmanned aerial vehicle.
  • each configuration described in this specification can be appropriately combined within a range that does not contradict each other.

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  • Mechanical Engineering (AREA)
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Abstract

A motor according to an aspect of the present invention is provided with: a rotor rotatable about a center axis; a stator radially facing the rotor with a gap therebetween; and a stator holding member that holds the stator. The stator holding member has a plurality of outer fins provided on the outer surface of the stator holding member. At least a portion of the plurality of outer fins has a lattice structure.

Description

モータ、回転翼装置、および無人飛行体Motors, rotorcraft, and unmanned aerial vehicles

　本発明は、モータ、回転翼装置、および無人飛行体に関する。 The present invention relates to a motor, a rotorcraft, and an unmanned aerial vehicle.

　ハウジングに複数のフィンが設けられたモータが知られる。例えば、特許文献１には、そのようなモータとして、無人航空機に搭載されるモータが記載される。 A motor with multiple fins in the housing is known. For example, Patent Document 1 describes a motor mounted on an unmanned aerial vehicle as such a motor.

特表２０１８－５０９３３２号公報Special Table 2018-509332

　上記のようなモータにおいては、フィンを介してモータの熱を外部に放出しやすい。しかし、ハウジングに配置できるフィンの数には限界があり、さらなる放熱性の向上に課題があった。 In the above motor, the heat of the motor is easily released to the outside through the fins. However, there is a limit to the number of fins that can be arranged in the housing, and there is a problem in further improving heat dissipation.

　本発明は、上記事情に鑑みて、放熱性を向上できる構造を有するモータ、回転翼装置、および無人飛行体を提供することを目的の一つとする。 In view of the above circumstances, one of the objects of the present invention is to provide a motor, a rotary wing device, and an unmanned aerial vehicle having a structure capable of improving heat dissipation.

　本発明のモータの一つの態様は、中心軸を中心として回転可能なロータと、前記ロータと隙間を介して径方向に対向するステータと、前記ステータを保持するステータ保持部材と、を備える。前記ステータ保持部材は、前記ステータ保持部材の外側面に設けられた複数の外側フィンを有する。前記複数の外側フィンの少なくとも一部は、ラティス構造を有する。 One aspect of the motor of the present invention includes a rotor that can rotate about a central axis, a stator that faces the rotor in the radial direction through a gap, and a stator holding member that holds the stator. The stator holding member has a plurality of outer fins provided on the outer surface of the stator holding member. At least a part of the plurality of outer fins has a lattice structure.

　本発明の回転翼装置の一つの態様は、上記のモータを備える。 One aspect of the rotary wing device of the present invention includes the above motor.

　本発明の無人飛行体の一つの態様は、上記の回転翼装置を備える。 One aspect of the unmanned aerial vehicle of the present invention includes the above rotary wing device.

　本発明の一つの態様によれば、モータの放熱性を向上できる。 According to one aspect of the present invention, the heat dissipation of the motor can be improved.

図１は、第１実施形態の無人飛行体を示す斜視図である。FIG. 1 is a perspective view showing an unmanned aerial vehicle according to the first embodiment. 図２は、第１実施形態の回転翼装置を示す斜視図である。FIG. 2 is a perspective view showing the rotary wing device of the first embodiment. 図３は、第１実施形態の回転翼装置を示す断面図である。FIG. 3 is a cross-sectional view showing the rotary wing device of the first embodiment. 図４は、第１実施形態の径方向フィンの一部を示す斜視図である。FIG. 4 is a perspective view showing a part of the radial fins of the first embodiment. 図５は、第１実施形態における変形例のモータの一部を示す断面図である。FIG. 5 is a cross-sectional view showing a part of the motor of the modified example in the first embodiment. 図６は、第２実施形態における回転翼装置の一部を示す断面図である。FIG. 6 is a cross-sectional view showing a part of the rotary wing device according to the second embodiment.

　各図に適宜示すＺ軸方向は、正の側を「上側」とし、負の側を「下側」とする上下方向である。各図に適宜示す中心軸Ｊは、Ｚ軸方向と平行であり、上下方向に延びる仮想線である。以下の説明においては、中心軸Ｊの軸方向、すなわち上下方向と平行な方向を単に「軸方向」と呼び、中心軸Ｊを中心とする径方向を単に「径方向」と呼び、中心軸Ｊを中心とする周方向を単に「周方向」と呼ぶ。 The Z-axis direction shown in each figure is a vertical direction in which the positive side is the "upper side" and the negative side is the "lower side". The central axis J appropriately shown in each figure is a virtual line that is parallel to the Z-axis direction and extends in the vertical direction. In the following description, the axial direction of the central axis J, that is, the direction parallel to the vertical direction is simply referred to as "axial direction", and the radial direction centered on the central axis J is simply referred to as "radial direction". The circumferential direction centered on is simply called the "circumferential direction".

　以下の実施形態において上側は、軸方向一方側に相当し、下側は、軸方向他方側に相当する。なお、上下方向、上側および下側とは、単に各部の配置関係等を説明するための名称であり、実際の配置関係等は、これらの名称で示される配置関係等以外の配置関係等であってもよい。 In the following embodiments, the upper side corresponds to one side in the axial direction, and the lower side corresponds to the other side in the axial direction. The vertical direction, the upper side, and the lower side are names for simply explaining the arrangement relationship of each part, and the actual arrangement relationship, etc. is an arrangement relationship other than the arrangement relationship, etc. indicated by these names. You may.

　また、本明細書において「軸方向に延びる」とは、厳密に軸方向に延びる場合に加えて、軸方向に対して、４５°未満の範囲で傾いた方向に延びる場合も含む。また、本明細書において「径方向に延びる」は、厳密に径方向、すなわち、軸方向に対して垂直な方向に延びる場合に加えて、径方向に対して、４５°未満の範囲で傾いた方向に延びる場合も含む。 Further, in the present specification, "extending in the axial direction" includes not only the case of extending in the strict axial direction but also the case of extending in a direction inclined within a range of less than 45 ° with respect to the axial direction. Further, in the present specification, "extending in the radial direction" means that in addition to the case where the "extending in the radial direction" is strictly radial, that is, in the direction perpendicular to the axial direction, the term "extends in the radial direction" is tilted in a range of less than 45 ° with respect to the radial direction. Including the case of extending in the direction.

＜第１実施形態＞
　図１に示すように、本実施形態の無人飛行体１０００は、本体部１１００と、撮像装置１２００と、回転翼装置１と、を備える。撮像装置１２００および回転翼装置１は、本体部１１００に取り付けられる。回転翼装置１は、無人飛行体１０００の推進力を発生させる装置である。本実施形態において回転翼装置１は、複数設けられる。回転翼装置１は、例えば、４つ設けられる。 <First Embodiment>
As shown in FIG. 1, the unmanned aerial vehicle 1000 of the present embodiment includes a main body 1100, an image pickup device 1200, and a rotary wing device 1. The image pickup device 1200 and the rotary wing device 1 are attached to the main body 1100. The rotary wing device 1 is a device that generates the propulsive force of the unmanned aerial vehicle 1000. In this embodiment, a plurality of rotary blade devices 1 are provided. For example, four rotor devices 1 are provided.

　図２および図３に示すように、回転翼装置１は、モータ１０と、プロペラ２と、ファン７５と、を備える。本実施形態においてモータ１０は、インナーロータ型のモータである。モータ１０は、ハウジング１１と、ロータ２０と、ステータ３０と、ベアリング２３，２４と、バスバーホルダ５０と、バスバー５１と、回路基板８０と、ホールセンサ８１と、を備える。ハウジング１１は、ロータ２０、ステータ３０、ベアリング２３，２４、バスバーホルダ５０、バスバー５１、回路基板８０、およびホールセンサ８１を内部に収容する。本実施形態においてハウジング１１は、ステータ保持部材に相当する。 As shown in FIGS. 2 and 3, the rotary blade device 1 includes a motor 10, a propeller 2, and a fan 75. In the present embodiment, the motor 10 is an inner rotor type motor. The motor 10 includes a housing 11, a rotor 20, a stator 30, bearings 23 and 24, a bus bar holder 50, a bus bar 51, a circuit board 80, and a hall sensor 81. The housing 11 internally houses the rotor 20, the stator 30, the bearings 23, 24, the bus bar holder 50, the bus bar 51, the circuit board 80, and the hall sensor 81. In this embodiment, the housing 11 corresponds to a stator holding member.

　ロータ２０は、中心軸Ｊを中心として回転可能である。図３に示すように、ロータ２０は、シャフト２１と、ロータ本体２２と、プロペラ取付部７０と、を有する。シャフト２１は、中心軸Ｊに沿って配置される。シャフト２１は、中心軸Ｊを中心とする円柱状である。シャフト２１は、ベアリング２３，２４によって中心軸Ｊ回りに回転可能に支持される。シャフト２１の上側の端部は、ハウジング１１の後述する頂壁部１１ａの径方向内側および保持部１１ｃの内部を介して、ハウジング１１よりも上側に突出する。シャフト２１の下側の端部は、後述するベアリングホルダ４０によって下側から覆われる。 The rotor 20 can rotate about the central axis J. As shown in FIG. 3, the rotor 20 includes a shaft 21, a rotor main body 22, and a propeller mounting portion 70. The shaft 21 is arranged along the central axis J. The shaft 21 has a columnar shape centered on the central axis J. The shaft 21 is rotatably supported around the central axis J by bearings 23 and 24. The upper end of the shaft 21 projects radially inside the top wall portion 11a of the housing 11, which will be described later, and inside the holding portion 11c, and protrudes above the housing 11. The lower end of the shaft 21 is covered from below by a bearing holder 40, which will be described later.

　ロータ本体２２は、シャフト２１に固定される。ロータ本体２２は、シャフト２１の外周面に固定されるロータコア２２ａと、ロータコア２２ａの外周面に固定されるロータマグネット２２ｂと、を有する。 The rotor body 22 is fixed to the shaft 21. The rotor main body 22 has a rotor core 22a fixed to the outer peripheral surface of the shaft 21 and a rotor magnet 22b fixed to the outer peripheral surface of the rotor core 22a.

　プロペラ取付部７０は、シャフト２１のうちロータ本体２２が固定される部分よりも上側に位置する部分に設けられる。本実施形態においてプロペラ取付部７０は、シャフト２１のうちハウジング１１よりも上側に突出する部分に設けられる。より詳細には、プロペラ取付部７０は、シャフト２１の上側の端部に固定される。プロペラ取付部７０は、シャフト２１に連結されるアタッチメント部材７１と、アタッチメント部材７１の上側に固定される連結部材７２と、を有する。 The propeller mounting portion 70 is provided on a portion of the shaft 21 located above the portion where the rotor body 22 is fixed. In the present embodiment, the propeller mounting portion 70 is provided on a portion of the shaft 21 that protrudes upward from the housing 11. More specifically, the propeller mounting portion 70 is fixed to the upper end of the shaft 21. The propeller mounting portion 70 has an attachment member 71 connected to the shaft 21 and a connecting member 72 fixed to the upper side of the attachment member 71.

　アタッチメント部材７１は、シャフト２１に沿って軸方向に延びる円筒状の軸部７１ａと、軸部７１ａの外周面から径方向外側に広がるフランジ部７１ｂと、フランジ部７１ｂの径方向外側の端部に固定される円筒状の筒部７１ｃと、を有する。筒部７１ｃには、ファン７５が固定される。ファン７５は、筒部７１ｃの外周面から径方向外側に延びる複数の羽根７５ａを有する。ファン７５は、プロペラ２と後述する頂壁部１１ａとの軸方向の間に位置する。本実施形態では、ファン７５は、軸方向に送風する軸流ファンである。 The attachment member 71 is provided on a cylindrical shaft portion 71a extending in the axial direction along the shaft 21, a flange portion 71b extending radially outward from the outer peripheral surface of the shaft portion 71a, and a radially outer end portion of the flange portion 71b. It has a cylindrical tubular portion 71c to be fixed. A fan 75 is fixed to the tubular portion 71c. The fan 75 has a plurality of blades 75a extending radially outward from the outer peripheral surface of the tubular portion 71c. The fan 75 is located between the propeller 2 and the top wall portion 11a described later in the axial direction. In the present embodiment, the fan 75 is an axial fan that blows air in the axial direction.

　本実施形態では、アタッチメント部材７１とファン７５とは、インサート成形により作製される。軸部７１ａおよびフランジ部７１ｂは金属製の単一部材である。筒部７１ｃとファン７５とは単一の樹脂部材の一部である。ファン７５の外径は、プロペラ２の外径よりも小さい。この構成により、プロペラ２とファン７５との干渉を抑制できる。また、回転翼装置１の重量の増加を抑制できる。 In the present embodiment, the attachment member 71 and the fan 75 are manufactured by insert molding. The shaft portion 71a and the flange portion 71b are single metal members. The tubular portion 71c and the fan 75 are a part of a single resin member. The outer diameter of the fan 75 is smaller than the outer diameter of the propeller 2. With this configuration, interference between the propeller 2 and the fan 75 can be suppressed. Further, it is possible to suppress an increase in the weight of the rotary blade device 1.

　連結部材７２は、アタッチメント部材７１の上面に固定される。連結部材７２は、円板状の部材であり、アタッチメント部材７１にネジで固定される。連結部材７２の上面には、プロペラ２がネジで固定される。これにより、プロペラ取付部７０には、プロペラ２が着脱可能に取り付けられる。 The connecting member 72 is fixed to the upper surface of the attachment member 71. The connecting member 72 is a disk-shaped member, and is fixed to the attachment member 71 with screws. The propeller 2 is fixed to the upper surface of the connecting member 72 with screws. As a result, the propeller 2 is detachably attached to the propeller attachment portion 70.

　プロペラ２は、軸方向に見て中央部に位置するハブ２ａと、ハブ２ａから径方向外側へ延びる２枚の羽根２ｂ，２ｃと、を有する。ハブ２ａは上下面が平坦面とされた平板状である。ハブ２ａは、軸方向に貫通する貫通孔を有する。プロペラ２は、ハブ２ａの貫通孔に通されるネジにより連結部材７２に固定される。 The propeller 2 has a hub 2a located at the center in the axial direction and two blades 2b and 2c extending radially outward from the hub 2a. The hub 2a has a flat plate shape with upper and lower surfaces flat. The hub 2a has a through hole that penetrates in the axial direction. The propeller 2 is fixed to the connecting member 72 by a screw passed through the through hole of the hub 2a.

　ステータ３０は、ロータ２０と隙間を介して径方向に対向する。本実施形態においてステータ３０は、ロータ２０の径方向外側においてロータ２０を囲む。ステータ３０は、ステータコア３１と、インシュレータ３４と、複数のコイル３５と、を有する。ステータコア３１は、ロータ本体２２の径方向外側においてロータ本体２２を囲む環状である。ステータコア３１は、コアバック３２と、複数のティース３３と、を有する。コアバック３２は、中心軸Ｊを中心とする円環状である。ティース３３は、コアバック３２から径方向内側に突出する。複数のティース３３は、周方向に沿って一周に亘って等間隔に配置される。 The stator 30 faces the rotor 20 in the radial direction through a gap. In this embodiment, the stator 30 surrounds the rotor 20 on the radial outer side of the rotor 20. The stator 30 has a stator core 31, an insulator 34, and a plurality of coils 35. The stator core 31 is an annular shape that surrounds the rotor body 22 on the radial outer side of the rotor body 22. The stator core 31 has a core back 32 and a plurality of teeth 33. The core back 32 is an annular shape centered on the central axis J. The teeth 33 project radially inward from the core back 32. The plurality of teeth 33 are arranged at equal intervals along the circumferential direction.

　インシュレータ３４は、コイル３５とステータコア３１とを絶縁する部材である。インシュレータ３４は、複数のティース３３のそれぞれに装着される。複数のコイル３５は、インシュレータ３４を介して、複数のティース３３のそれぞれに装着される。 The insulator 34 is a member that insulates the coil 35 and the stator core 31. The insulator 34 is attached to each of the plurality of teeth 33. The plurality of coils 35 are attached to each of the plurality of teeth 33 via the insulator 34.

　図示は省略するが、本実施形態においてコイル３５は、例えば、ステータコア３１およびインシュレータ３４とともに樹脂モールドされる。モールド樹脂の上側の端面は、後述する頂壁部１１ａの下面に接触する。すなわち、コイル３５と頂壁部１１ａとは、モールド樹脂により熱的に接続される。コイル３５において発生する熱の一部は、樹脂モールドおよび頂壁部１１ａを介して後述する軸方向フィン１６に伝わり、軸方向フィン１６から放熱される。 Although not shown, in the present embodiment, the coil 35 is resin-molded together with, for example, the stator core 31 and the insulator 34. The upper end surface of the mold resin comes into contact with the lower surface of the top wall portion 11a, which will be described later. That is, the coil 35 and the top wall portion 11a are thermally connected by the mold resin. Part of the heat generated in the coil 35 is transferred to the axial fins 16 described later via the resin mold and the top wall portion 11a, and is dissipated from the axial fins 16.

　バスバーホルダ５０は、ステータ３０の下側に配置される。バスバーホルダ５０は、複数のバスバー５１を保持する。バスバー５１は、複数のコイル３５から延びる引出線に接続される。 The bus bar holder 50 is arranged below the stator 30. The bus bar holder 50 holds a plurality of bus bars 51. The bus bar 51 is connected to leader wires extending from the plurality of coils 35.

　回路基板８０は、径方向に拡がる板状である。回路基板８０は、ステータ３０の下側に配置される。本実施形態において回路基板８０は、後述する保持部４１の径方向外側に配置される。ホールセンサ８１は、回路基板８０の上側の面に取り付けられる。ホールセンサ８１はロータマグネット２２ｂの磁界を検出する。図示は省略するが、ホールセンサ８１は、周方向に沿って複数設けられる。 The circuit board 80 has a plate shape that expands in the radial direction. The circuit board 80 is arranged below the stator 30. In the present embodiment, the circuit board 80 is arranged outside the holding portion 41 described later in the radial direction. The Hall sensor 81 is attached to the upper surface of the circuit board 80. The Hall sensor 81 detects the magnetic field of the rotor magnet 22b. Although not shown, a plurality of Hall sensors 81 are provided along the circumferential direction.

　ハウジング１１は、頂壁部１１ａと、筒状部１１ｂと、保持部１１ｃと、底壁部１１ｄと、ベアリングホルダ４０と、を有する。本実施形態において頂壁部１１ａと筒状部１１ｂと保持部１１ｃとは、同一の単一部材の一部である。すなわち、頂壁部１１ａと筒状部１１ｂと保持部１１ｃとは、一体成形されている。底壁部１１ｄおよびベアリングホルダ４０は、頂壁部１１ａと筒状部１１ｂと保持部１１ｃとを含む単一部材とは別部材であり、当該単一部材に固定される。底壁部１１ｄとベアリングホルダ４０とは、互いに別部材である。 The housing 11 has a top wall portion 11a, a tubular portion 11b, a holding portion 11c, a bottom wall portion 11d, and a bearing holder 40. In the present embodiment, the top wall portion 11a, the tubular portion 11b, and the holding portion 11c are a part of the same single member. That is, the top wall portion 11a, the tubular portion 11b, and the holding portion 11c are integrally molded. The bottom wall portion 11d and the bearing holder 40 are separate members from the single member including the top wall portion 11a, the tubular portion 11b, and the holding portion 11c, and are fixed to the single member. The bottom wall portion 11d and the bearing holder 40 are separate members from each other.

　頂壁部１１ａは、ステータ３０の上側に位置し、ステータ３０の上側を覆う。頂壁部１１ａは、プロペラ２およびファン７５の下側に位置する。本実施形態において頂壁部１１ａは、ファン７５と軸方向に隙間を介して対向する。頂壁部１１ａは、中心軸Ｊを中心とする円環板状である。筒状部１１ｂは、頂壁部１１ａの径方向外周縁部から下側に延びる。筒状部１１ｂは、中心軸Ｊを中心とし、下側に開口する円筒状である。筒状部１１ｂの内周面には、ステータ３０が固定される。これにより、ハウジング１１は、ステータ３０を保持する。 The top wall portion 11a is located above the stator 30 and covers the upper side of the stator 30. The top wall portion 11a is located below the propeller 2 and the fan 75. In the present embodiment, the top wall portion 11a faces the fan 75 in the axial direction via a gap. The top wall portion 11a has an annular plate shape centered on the central axis J. The tubular portion 11b extends downward from the radial outer peripheral edge portion of the top wall portion 11a. The tubular portion 11b has a cylindrical shape that opens downward with the central axis J as the center. The stator 30 is fixed to the inner peripheral surface of the tubular portion 11b. As a result, the housing 11 holds the stator 30.

　保持部１１ｃは、頂壁部１１ａの径方向内周縁部から上側に突出する。保持部１１ｃの径方向内側には、ベアリング２３が保持される。底壁部１１ｄは、筒状部１１ｂの下側の端部に固定される。底壁部１１ｄは、筒状部１１ｂの下側の端部から径方向内側に突出する。底壁部１１ｄは、ステータ３０の下側に位置し、ステータ３０の下側を覆う。底壁部１１ｄは、中心軸Ｊを中心とする円環板状である。底壁部１１ｄの径方向外周縁部は、筒状部１１ｂの下側の端部に、例えば、ネジで固定される。 The holding portion 11c projects upward from the radial inner peripheral edge portion of the top wall portion 11a. The bearing 23 is held inside the holding portion 11c in the radial direction. The bottom wall portion 11d is fixed to the lower end of the tubular portion 11b. The bottom wall portion 11d projects radially inward from the lower end of the tubular portion 11b. The bottom wall portion 11d is located below the stator 30 and covers the underside of the stator 30. The bottom wall portion 11d has an annular plate shape centered on the central axis J. The radial outer peripheral edge of the bottom wall portion 11d is fixed to the lower end of the tubular portion 11b, for example, with a screw.

　ベアリングホルダ４０は、底壁部１１ｄの径方向内側の開口部に固定される。ベアリングホルダ４０は、底壁部１１ｄの径方向内側の開口部を下側から塞ぐ。ベアリングホルダ４０は、ロータ本体２２を下側から覆う。ベアリングホルダ４０は、上側に開口する円筒状の保持部４１を有する。保持部４１には、ベアリング２４が保持される。 The bearing holder 40 is fixed to the opening inside the bottom wall portion 11d in the radial direction. The bearing holder 40 closes the radial inner opening of the bottom wall portion 11d from below. The bearing holder 40 covers the rotor body 22 from below. The bearing holder 40 has a cylindrical holding portion 41 that opens upward. The bearing 24 is held by the holding portion 41.

　ハウジング１１は、複数の外側フィン１４を有する。複数の外側フィン１４は、ハウジング１１の外側面に設けられる。本実施形態においてハウジング１１の外側面は、頂壁部１１ａの上側の面、筒状部１１ｂの外周面、底壁部１１ｄの下側の面、およびベアリングホルダ４０の下側の面を含む。複数の外側フィン１４は、ハウジング１１の他の部分と一体成形されてもよいし、ハウジング１１の他の部分と別部材であり他の部分に固定されてもよい。本実施形態において複数の外側フィン１４は、複数の径方向フィン１５と、複数の軸方向フィン１６と、を含む。 The housing 11 has a plurality of outer fins 14. The plurality of outer fins 14 are provided on the outer surface of the housing 11. In the present embodiment, the outer surface of the housing 11 includes an upper surface of the top wall portion 11a, an outer peripheral surface of the tubular portion 11b, a lower surface of the bottom wall portion 11d, and a lower surface of the bearing holder 40. The plurality of outer fins 14 may be integrally molded with other parts of the housing 11, or may be a separate member from the other parts of the housing 11 and may be fixed to the other parts. In the present embodiment, the plurality of outer fins 14 include a plurality of radial fins 15 and a plurality of axial fins 16.

　複数の径方向フィン１５は、ハウジング１１の外周面、すなわち筒状部１１ｂの外周面に設けられる。図２に示すように、複数の径方向フィン１５は、周方向沿って互いに間隔を空けて配置される。本実施形態において複数の径方向フィン１５は、周方向に沿って一周に亘って等間隔に配置される。径方向フィン１５は、例えば、板面が周方向を向く板状である。径方向フィン１５は、筒状部１１ｂの上端部から下端部まで軸方向に延びる。 The plurality of radial fins 15 are provided on the outer peripheral surface of the housing 11, that is, the outer peripheral surface of the tubular portion 11b. As shown in FIG. 2, the plurality of radial fins 15 are arranged so as to be spaced apart from each other along the circumferential direction. In the present embodiment, the plurality of radial fins 15 are arranged at equal intervals over one circumference along the circumferential direction. The radial fin 15 has, for example, a plate shape in which the plate surface faces the circumferential direction. The radial fin 15 extends axially from the upper end to the lower end of the tubular portion 11b.

　本実施形態において複数の径方向フィン１５の少なくとも一部は、ラティス構造を有する。すなわち、複数の外側フィン１４の少なくとも一部は、ラティス構造を有する。ラティス構造は、複数の梁が格子状に組み合わされた構造である。図４に示すように、本実施形態の径方向フィン１５は、複数の梁１５ｐが格子状に組み合わされたラティス構造である。ラティス構造は、例えば、三次元造形機によって作られる。 In the present embodiment, at least a part of the plurality of radial fins 15 has a lattice structure. That is, at least a part of the plurality of outer fins 14 has a lattice structure. The lattice structure is a structure in which a plurality of beams are combined in a grid pattern. As shown in FIG. 4, the radial fin 15 of the present embodiment has a lattice structure in which a plurality of beams 15p are combined in a grid pattern. The lattice structure is made, for example, by a three-dimensional modeling machine.

　なお、本明細書において「複数のフィンの少なくとも一部が、ラティス構造を有する」とは、１つのフィンの少なくとも一部がラティス構造を有していればよく、複数のフィンのうち一部のフィンがラティス構造を有していなくてもよいし、１つのフィンがラティス構造となっている部分とラティス構造となっていない部分とを含んでいてもよい。本実施形態では、複数の径方向フィン１５のすべての径方向フィン１５がラティス構造を有しており、各径方向フィン１５の全体がラティス構造である。 In the present specification, "at least a part of a plurality of fins has a lattice structure" means that at least a part of one fin has a lattice structure, and some of the plurality of fins may have a lattice structure. The fins do not have to have a lattice structure, and one fin may include a portion having a lattice structure and a portion not having a lattice structure. In the present embodiment, all the radial fins 15 of the plurality of radial fins 15 have a lattice structure, and the entire radial fins 15 have a lattice structure.

　ラティス構造は、複数の梁が格子状に組み合わされて構成されるため、同じ外形状の中実部材よりも表面積を大きくできる。そのため、ハウジング１１の外側面に設けられた複数の外側フィン１４の少なくとも一部をラティス構造とすることで、外側フィン１４の表面積を大きくすることができ、外側フィン１４から放出される熱量を増大させることができる。 Since the lattice structure is constructed by combining multiple beams in a grid pattern, the surface area can be larger than that of a solid member having the same outer shape. Therefore, by forming at least a part of the plurality of outer fins 14 provided on the outer surface of the housing 11 into a lattice structure, the surface area of the outer fins 14 can be increased and the amount of heat released from the outer fins 14 is increased. Can be made to.

　また、ラティス構造を構成する梁同士の間には隙間が設けられるため、ラティス構造に送られた空気は、梁同士の隙間を通り、乱流となりやすい。具体的に本実施形態では、図４に示す梁１５ｐ同士の間を空気が通ることで、空気の流れが乱流となりやすい。乱流は、層流に比べて熱伝達係数が大きくなる。これにより、ラティス構造に送られた空気に外側フィン１４からの熱が伝達されやすくなり、外側フィン１４から放出される熱量をより増大できる。以上により、本実施形態によれば、モータ１０の放熱性を向上できる。 In addition, since a gap is provided between the beams constituting the lattice structure, the air sent to the lattice structure easily passes through the gap between the beams and becomes turbulent. Specifically, in the present embodiment, the air flow tends to be turbulent due to the passage of air between the beams 15p shown in FIG. Turbulent flow has a larger heat transfer coefficient than laminar flow. As a result, the heat from the outer fin 14 is easily transferred to the air sent to the lattice structure, and the amount of heat released from the outer fin 14 can be further increased. As described above, according to the present embodiment, the heat dissipation of the motor 10 can be improved.

　また、外側フィン１４の表面に沿って流れる空気は、外側フィン１４から放熱されることで、温度が上昇する。外側フィン１４の表面に沿って流れる空気の温度は、外側フィン１４の表面から所定の距離までの間の領域において変化する。この領域は、温度境界層と呼ばれる。すなわち、外側フィン１４の熱は、外側フィン１４の温度境界層を通る空気に放出される。ここで、隣り合う一対の外側フィン１４において、一方の外側フィン１４の温度境界層に他方の外側フィン１４が配置されると、一方の外側フィン１４から空気に放出された熱が温度境界層を通る空気を介して他方の外側フィン１４に伝達される。そのため、外側フィン１４からの熱がモータ１０の外部に放出されにくくなり、モータ１０の放熱性を十分に向上できない場合がある。したがって、外側フィン１４同士は、温度境界層以上に離して配置する必要がある。そのため、ハウジング１１の外側面に配置できる外側フィン１４の数には限界がある。 Further, the air flowing along the surface of the outer fin 14 is dissipated from the outer fin 14, so that the temperature rises. The temperature of the air flowing along the surface of the outer fin 14 varies in the region between the surface of the outer fin 14 and a predetermined distance. This region is called the temperature boundary layer. That is, the heat of the outer fin 14 is released to the air passing through the temperature boundary layer of the outer fin 14. Here, in a pair of adjacent outer fins 14, when the other outer fin 14 is arranged on the temperature boundary layer of one outer fin 14, the heat released to the air from the one outer fin 14 forms the temperature boundary layer. It is transmitted to the other outer fin 14 via the passing air. Therefore, the heat from the outer fins 14 is less likely to be released to the outside of the motor 10, and the heat dissipation of the motor 10 may not be sufficiently improved. Therefore, the outer fins 14 need to be arranged apart from each other above the temperature boundary layer. Therefore, there is a limit to the number of outer fins 14 that can be arranged on the outer surface of the housing 11.

　これに対して、本実施形態によれば、外側フィン１４の少なくとも一部をラティス構造とすることで、外側フィン１４の数を増加させることなく、複数の外側フィン１４による全体の放熱量を向上できる。そのため、ハウジング１１に対して外側フィン１４を最大限配置した場合であっても、モータ１０の放熱性をさらに向上できる。 On the other hand, according to the present embodiment, by forming at least a part of the outer fins 14 into a lattice structure, the total amount of heat radiated by the plurality of outer fins 14 is improved without increasing the number of the outer fins 14. it can. Therefore, even when the outer fins 14 are arranged as much as possible with respect to the housing 11, the heat dissipation of the motor 10 can be further improved.

　また、ラティス構造は、同じ外形状を有する中実部材と同等の強度を維持できる構造である。そのため、外側フィン１４の少なくとも一部をラティス構造として表面積を向上させても、外側フィン１４の強度を維持できる。したがって、外側フィン１４の表面積を増大させて放熱性を向上させつつ、外側フィン１４が破損することを抑制できる。また、ラティス構造は、同じ外形状を有する中実部材よりも軽量である。そのため、モータ１０全体を軽量化できる。 In addition, the lattice structure is a structure that can maintain the same strength as a solid member having the same outer shape. Therefore, the strength of the outer fin 14 can be maintained even if at least a part of the outer fin 14 has a lattice structure to improve the surface area. Therefore, it is possible to prevent the outer fins 14 from being damaged while increasing the surface area of the outer fins 14 to improve the heat dissipation. Also, the lattice structure is lighter than a solid member having the same outer shape. Therefore, the weight of the entire motor 10 can be reduced.

　本実施形態のように無人飛行体１０００に搭載されるモータ１０においては、特に放熱性および耐久性が求められやすい。そのため、上述したように、強度を維持しつつ放熱性を向上できる効果は、無人飛行体１０００に搭載されるモータ１０において、特に有用に得られる。また、無人飛行体１０００においては、軽量化も求められやすい。そのため、上述したモータ１０全体を軽量化できる効果も、無人飛行体１０００に搭載されるモータ１０において、特に有用に得られる。 In the motor 10 mounted on the unmanned aerial vehicle 1000 as in the present embodiment, heat dissipation and durability are particularly likely to be required. Therefore, as described above, the effect of improving heat dissipation while maintaining the strength is particularly useful in the motor 10 mounted on the unmanned aerial vehicle 1000. Further, in the unmanned aerial vehicle 1000, weight reduction is likely to be required. Therefore, the effect of reducing the weight of the entire motor 10 described above can be obtained particularly usefully in the motor 10 mounted on the unmanned aerial vehicle 1000.

　また、本実施形態によれば、ロータ２０およびステータ３０を内部に収容するハウジング１１の外周面に設けられた複数の径方向フィン１５の少なくとも一部が、ラティス構造を有する。そのため、径方向フィン１５から放出される熱量を増大できる。これにより、ステータ３０が固定される筒状部１１ｂからの熱を径方向フィン１５によって好適に外部に放出することができる。したがって、モータ１０の放熱性をより向上できる。 Further, according to the present embodiment, at least a part of the plurality of radial fins 15 provided on the outer peripheral surface of the housing 11 that houses the rotor 20 and the stator 30 has a lattice structure. Therefore, the amount of heat released from the radial fins 15 can be increased. As a result, the heat from the tubular portion 11b to which the stator 30 is fixed can be suitably released to the outside by the radial fins 15. Therefore, the heat dissipation of the motor 10 can be further improved.

　また、本実施形態によれば、シャフト２１のうちハウジング１１よりも上側に突出する部分には、プロペラ２が取り付けられるプロペラ取付部７０が設けられる。そのため、プロペラ２が回転することで、プロペラ２から空気が下側に流れ、ハウジング１１に空気が送られる。これにより、ハウジング１１の外周面に設けられた径方向フィン１５に空気が送られ、径方向フィン１５から好適に熱を放出させることができる。したがって、モータ１０の放熱性をより向上できる。 Further, according to the present embodiment, a propeller mounting portion 70 to which the propeller 2 is mounted is provided at a portion of the shaft 21 that protrudes upward from the housing 11. Therefore, as the propeller 2 rotates, air flows downward from the propeller 2 and air is sent to the housing 11. As a result, air is sent to the radial fins 15 provided on the outer peripheral surface of the housing 11, and heat can be suitably released from the radial fins 15. Therefore, the heat dissipation of the motor 10 can be further improved.

　図２および図３に示すように、複数の軸方向フィン１６は、ハウジング１１の上側の面、すなわち頂壁部１１ａの上側の面に設けられる。複数の軸方向フィン１６は、頂壁部１１ａの上面から上側に突出する。軸方向フィン１６は、例えば、円柱状である。複数の軸方向フィン１６が配置される領域は、中心軸Ｊを周方向に囲む円環状である。本実施形態において複数の軸方向フィン１６は、径方向フィン１５と異なり、いずれもラティス構造を有しない。すなわち、本実施形態において複数の外側フィン１４は、一部の外側フィン１４のみがラティス構造を有する。 As shown in FIGS. 2 and 3, the plurality of axial fins 16 are provided on the upper surface of the housing 11, that is, the upper surface of the top wall portion 11a. The plurality of axial fins 16 project upward from the upper surface of the top wall portion 11a. The axial fin 16 is, for example, cylindrical. The region in which the plurality of axial fins 16 are arranged is an annular shape that surrounds the central axis J in the circumferential direction. In the present embodiment, the plurality of axial fins 16 do not have a lattice structure, unlike the radial fins 15. That is, in the present embodiment, only some of the outer fins 14 of the plurality of outer fins 14 have a lattice structure.

（第１実施形態の変形例）
　図５に示すように、本変形例のモータ１１０において複数の径方向フィン１１５の少なくとも１つは、第１部分１１５ａと、第２部分１１５ｂと、を有する。本変形例では、例えば、すべての径方向フィン１１５のそれぞれが、第１部分１１５ａと、第２部分１１５ｂと、を有する。 (Modified example of the first embodiment)
As shown in FIG. 5, in the motor 110 of the present modification, at least one of the plurality of radial fins 115 has a first portion 115a and a second portion 115b. In this modification, for example, each of all radial fins 115 has a first portion 115a and a second portion 115b.

　第１部分１１５ａは、径方向フィン１１５の上側部分である。第１部分１１５ａは、ステータコア３１の径方向外側に位置する。第１部分１１５ａは、ラティス構造を有する。第２部分１１５ｂは、第１部分１１５ａの下側に繋がる。第２部分１１５ｂは、径方向フィン１１５の下側部分である。第２部分１１５ｂは、ステータコア３１よりも下側に位置する。第２部分１１５ｂの軸方向の寸法は、第１部分１１５ａの軸方向の寸法よりも小さい。 The first portion 115a is an upper portion of the radial fin 115. The first portion 115a is located on the radial outer side of the stator core 31. The first portion 115a has a lattice structure. The second portion 115b is connected to the lower side of the first portion 115a. The second portion 115b is a lower portion of the radial fin 115. The second portion 115b is located below the stator core 31. The axial dimension of the second portion 115b is smaller than the axial dimension of the first portion 115a.

　第２部分１１５ｂは、ラティス構造ではなく、中実板状の部分である。すなわち、第２部分１１５ｂは、非ラティス構造を有する。なお、本明細書において「非ラティス構造」とは、ラティス構造以外の構造であればよい。 The second part 115b is not a lattice structure but a solid plate-like part. That is, the second portion 115b has a non-lattice structure. In the present specification, the “non-lattice structure” may be any structure other than the lattice structure.

　例えばプロペラ２から下側に送られる空気は、周方向に隣り合う径方向フィン１１５同士の間を上側から下側に流れる。このとき、径方向フィン１１５に沿って流れる空気には径方向フィン１１５から熱が放出されるため、径方向フィン１１５に沿って流れる空気の温度は、下側に向かうに従って高くなる。これにより、径方向フィン１１５のうち下側に位置する第２部分１１５ｂに沿って流れる空気の温度は比較的高くなり、第２部分１１５ｂに沿って流れる空気には径方向フィン１１５から熱が放出されにくくなる。したがって、第２部分１１５ｂは、第１部分１１５ａに比べてモータ１１０の放熱性向上に対する寄与が小さい。 For example, the air sent from the propeller 2 to the lower side flows from the upper side to the lower side between the radial fins 115 adjacent to each other in the circumferential direction. At this time, since heat is released from the radial fins 115 to the air flowing along the radial fins 115, the temperature of the air flowing along the radial fins 115 becomes higher toward the lower side. As a result, the temperature of the air flowing along the second portion 115b located on the lower side of the radial fins 115 becomes relatively high, and heat is released from the radial fins 115 to the air flowing along the second portion 115b. It becomes difficult to be done. Therefore, the second portion 115b contributes less to the improvement of heat dissipation of the motor 110 than the first portion 115a.

　そのため、第２部分１１５ｂをラティス構造としなくても、第１部分１１５ａをラティス構造とすることで、径方向フィン１１５から放出される熱量を好適に増大させることができ、モータ１１０の放熱性を好適に向上できる。そして、第２部分１１５ｂをラティス構造としないことで、径方向フィン１１５の一部をラティス構造としなくてよいため、径方向フィン１１５の製造コストを低減できる。したがって、モータ１１０の放熱性を向上させつつ、モータ１１０の製造コストを低減できる。 Therefore, even if the second portion 115b does not have a lattice structure, the amount of heat emitted from the radial fins 115 can be suitably increased by forming the first portion 115a with a lattice structure, and the heat dissipation of the motor 110 can be improved. It can be improved suitably. Since the second portion 115b does not have a lattice structure, a part of the radial fins 115 does not have to have a lattice structure, so that the manufacturing cost of the radial fins 115 can be reduced. Therefore, the manufacturing cost of the motor 110 can be reduced while improving the heat dissipation of the motor 110.

＜第２実施形態＞
　図６に示すように、本実施形態の回転翼装置２０１のモータ２１０において、ステータ２３０のステータコア２３１は、コアバック２３２の外周面に、軸方向に延びる複数の第１溝部２３２ａを有する。ハウジング２１１は、筒状部２１１ｂの内周面に、軸方向に延びる複数の第２溝部２１１ｆを有する。図示は省略するが、複数の第１溝部２３２ａと複数の第２溝部２１１ｆとは、それぞれ周方向に沿って間隔を空けて配置される。第１溝部２３２ａと第２溝部２１１ｆとは、径方向に対向して配置される。ハウジング２１１は、それぞれが第１溝部２３２ａと第２溝部２１１ｆとからなる複数の外周側流路２６１を有する。本実施形態においてハウジング２１１の保持部２１１ｃは、保持部２１１ｃを軸方向に貫通する複数の貫通孔２１１ｅを有する。 <Second Embodiment>
As shown in FIG. 6, in the motor 210 of the rotary blade device 201 of the present embodiment, the stator core 231 of the stator 230 has a plurality of first groove portions 232a extending in the axial direction on the outer peripheral surface of the core back 232. The housing 211 has a plurality of second groove portions 211f extending in the axial direction on the inner peripheral surface of the tubular portion 211b. Although not shown, the plurality of first groove portions 232a and the plurality of second groove portions 211f are arranged at intervals along the circumferential direction. The first groove portion 232a and the second groove portion 211f are arranged so as to face each other in the radial direction. The housing 211 has a plurality of outer peripheral flow paths 261 each including a first groove portion 232a and a second groove portion 211f. In the present embodiment, the holding portion 211c of the housing 211 has a plurality of through holes 211e that penetrate the holding portion 211c in the axial direction.

　本実施形態において複数の軸方向フィン２１６の少なくとも一部は、ラティス構造を有する。そのため、軸方向フィン２１６によって放出できる熱量を増大できる。これにより、モータ２１０の放熱性を向上できる。本実施形態においては、すべての軸方向フィン２１６の全体が、ラティス構造を有する。本実施形態において軸方向フィン２１６は、頂壁部１１ａの上側の面から上側に突出する長方形板状である。軸方向フィン２１６の板面は、周方向を向く。軸方向フィン２１６は、径方向に延びる。図示は省略するが、複数の軸方向フィン２１６は、周方向に沿って一周に亘って等間隔に配置される。 In the present embodiment, at least a part of the plurality of axial fins 216 has a lattice structure. Therefore, the amount of heat that can be released by the axial fins 216 can be increased. As a result, the heat dissipation of the motor 210 can be improved. In this embodiment, all of the axial fins 216 have a lattice structure. In the present embodiment, the axial fins 216 have a rectangular plate shape protruding upward from the upper surface of the top wall portion 11a. The plate surface of the axial fin 216 faces the circumferential direction. Axial fins 216 extend radially. Although not shown, the plurality of axial fins 216 are arranged at equal intervals along the circumferential direction.

　本実施形態においてハウジング２１１は、封止部材２１４を有する。封止部材２１４は、隣り合うティース３３同士の径方向内側に向く開口部を封止する。封止部材２１４は、ステータ２３０の内周端において軸方向に延びる複数の柱部２１４ａと、複数の柱部２１４ａの上端に繋がる上側環状部２１４ｂと、複数の柱部２１４ａの下端に繋がる下側環状部２１４ｃと、を有する。上側環状部２１４ｂおよび下側環状部２１４ｃは、中心軸Ｊを中心とする環状である。上側環状部２１４ｂの上側の端部は、頂壁部１１ａの下側の面と接触する。下側環状部２１４ｃの下側の端部は、底壁部２１１ｄの上側の面に接触する。複数の柱部２１４ａは、隣り合うティース３３同士の周方向の間に位置する。ロータ２０は、封止部材２１４の径方向内側に配置される。 In the present embodiment, the housing 211 has a sealing member 214. The sealing member 214 seals an opening facing inward in the radial direction between adjacent teeth 33. The sealing member 214 includes a plurality of pillars 214a extending in the axial direction at the inner peripheral end of the stator 230, an upper annular portion 214b connected to the upper ends of the plurality of pillars 214a, and a lower side connected to the lower ends of the plurality of pillars 214a. It has an annular portion 214c and. The upper annular portion 214b and the lower annular portion 214c are annular around the central axis J. The upper end of the upper annular portion 214b comes into contact with the lower surface of the top wall portion 11a. The lower end of the lower annular portion 214c contacts the upper surface of the bottom wall portion 211d. The plurality of pillar portions 214a are located between adjacent teeth 33 in the circumferential direction. The rotor 20 is arranged inside the sealing member 214 in the radial direction.

　本実施形態においてハウジング２１１は、コイル３５が収容される密閉室２６０を有する。本実施形態において密閉室２６０は、頂壁部１１ａと筒状部２１１ｂと底壁部２１１ｄと封止部材２１４とによって囲まれて構成される。密閉室２６０には、冷却媒体ＣＭが収容される。冷却媒体ＣＭは、例えば、フッ素系の不活性液体である。冷却媒体ＣＭは、例えば、絶縁性を有する。冷却媒体ＣＭによって、密閉室２６０に収容されたコイル３５を直接冷却できる。これにより、ステータ２３０の冷却効率を向上できる。本実施形態においては、密閉室２６０の内部の全体に、冷却媒体ＣＭが充填される。 In this embodiment, the housing 211 has a closed chamber 260 in which the coil 35 is housed. In the present embodiment, the closed chamber 260 is surrounded by a top wall portion 11a, a tubular portion 211b, a bottom wall portion 211d, and a sealing member 214. The cooling medium CM is housed in the closed chamber 260. The cooling medium CM is, for example, a fluorine-based inert liquid. The cooling medium CM has, for example, insulating properties. The cooling medium CM can directly cool the coil 35 housed in the closed chamber 260. As a result, the cooling efficiency of the stator 230 can be improved. In the present embodiment, the entire inside of the closed chamber 260 is filled with the cooling medium CM.

　密閉室２６０は、上述した外周側流路２６１と、内周側流路２６２と、上部流路２６３と、下部流路２６４と、を有する。内周側流路２６２は、周方向に隣り合うティース３３と封止部材２１４の柱部２１４ａとに囲まれて構成される。内周側流路２６２は、軸方向に沿って延び、ステータ２３０を軸方向に貫通する。上部流路２６３は、ステータ２３０と頂壁部１１ａとの間に設けられる。上部流路２６３は、複数の外周側流路２６１の上端、および複数の内周側流路２６２の上端と接続される。下部流路２６４は、ステータ２３０と底壁部２１１ｄとの間に設けられる。下部流路２６４は、複数の外周側流路２６１の下端、および複数の内周側流路２６２の下端と接続される。 The closed chamber 260 has the above-mentioned outer peripheral side flow path 261, inner peripheral side flow path 262, upper flow path 263, and lower flow path 264. The inner peripheral side flow path 262 is surrounded by the teeth 33 adjacent to each other in the circumferential direction and the pillar portion 214a of the sealing member 214. The inner peripheral side flow path 262 extends along the axial direction and penetrates the stator 230 in the axial direction. The upper flow path 263 is provided between the stator 230 and the top wall portion 11a. The upper flow path 263 is connected to the upper ends of the plurality of outer peripheral side flow paths 261 and the upper ends of the plurality of inner peripheral side flow paths 262. The lower flow path 264 is provided between the stator 230 and the bottom wall portion 211d. The lower flow path 264 is connected to the lower ends of the plurality of outer peripheral side flow paths 261 and the lower ends of the plurality of inner peripheral side flow paths 262.

　本実施形態のハウジング２１１は、密閉室２６０の内側面に設けられる複数の内側フィン２１７を有する。本実施形態において内側フィン２１７は、頂壁部１１ａの下側の面から下側に突出する。内側フィン２１７は、板面が周方向を向く板状である。内側フィン２１７は、径方向に延びる。図示は省略するが、複数の内側フィン２１７は、周方向に沿って一周に亘って等間隔に配置される。 The housing 211 of the present embodiment has a plurality of inner fins 217 provided on the inner side surface of the closed chamber 260. In the present embodiment, the inner fin 217 protrudes downward from the lower surface of the top wall portion 11a. The inner fin 217 has a plate shape with the plate surface facing in the circumferential direction. The inner fin 217 extends radially. Although not shown, the plurality of inner fins 217 are arranged at equal intervals along the circumferential direction.

　複数の内側フィン２１７の少なくとも一部は、ラティス構造を有する。そのため、内側フィン２１７の表面積を大きくでき、密閉室２６０に収容された冷却媒体ＣＭを介して、コイル３５の熱を内側フィン２１７に吸収させやすい。これにより、冷却媒体ＣＭに放出されたコイル３５の熱が、内側フィン２１７を介してハウジング２１１に伝わりやすく、ハウジング２１１の外部に放出されやすい。したがって、モータ２１０の放熱性をより向上できる。本実施形態では、頂壁部１１ａの上面に軸方向フィン２１６が設けられるため、内側フィン２１７からハウジング２１１に吸収された熱は、軸方向フィン２１６を介してよりハウジング２１１の外部に放出されやすい。 At least a part of the plurality of inner fins 217 has a lattice structure. Therefore, the surface area of the inner fin 217 can be increased, and the heat of the coil 35 can be easily absorbed by the inner fin 217 via the cooling medium CM housed in the closed chamber 260. As a result, the heat of the coil 35 released to the cooling medium CM is easily transferred to the housing 211 via the inner fins 217, and is easily released to the outside of the housing 211. Therefore, the heat dissipation of the motor 210 can be further improved. In the present embodiment, since the axial fins 216 are provided on the upper surface of the top wall portion 11a, the heat absorbed by the inner fins 217 into the housing 211 is more likely to be released to the outside of the housing 211 via the axial fins 216. ..

　本実施形態においては、すべての内側フィン２１７の全体が、ラティス構造を有する。そのため、冷却媒体ＣＭに放出されたコイル３５の熱を、よりハウジング２１１に伝えやすい。 In this embodiment, all the inner fins 217 have a lattice structure. Therefore, the heat of the coil 35 released to the cooling medium CM can be more easily transferred to the housing 211.

　本実施形態においてファン２７５は、モータ２１０の内部に冷却空気を流通させる。本実施形態においてファン２７５は、遠心ファンである。ファン２７５の回転により、モータ２１０上部の空気が径方向外側へ吹き出されることにより、ファン２７５の径方向内側のベアリング２３近傍の圧力が低くなる。これにより、モータ２１０の下部の空気が、ロータ２０の周囲を通って、貫通孔２１１ｅへ移動する。したがって、回転翼装置２０１は、モータ２１０の内部を通り、ファン２７５の径方向外側へ抜ける空気の流通経路を有する。そのため、当該流通経路を通る空気によって、ステータ２３０を径方向内側から冷却できる。 In the present embodiment, the fan 275 circulates cooling air inside the motor 210. In this embodiment, the fan 275 is a centrifugal fan. Due to the rotation of the fan 275, the air above the motor 210 is blown out in the radial direction, so that the pressure in the vicinity of the bearing 23 on the radial inside of the fan 275 becomes low. As a result, the air in the lower part of the motor 210 passes around the rotor 20 and moves to the through hole 211e. Therefore, the rotor device 201 has an air flow path that passes through the inside of the motor 210 and exits radially outward of the fan 275. Therefore, the stator 230 can be cooled from the inside in the radial direction by the air passing through the distribution path.

　ファン２７５によって径方向外側に吹き出される空気は、軸方向フィン２１６を通る。そのため、ファン２７５によって径方向外側に吹き出される空気に、軸方向フィン２１６から熱を好適に放出できる。これにより、モータ２１０の放熱性をより向上できる。 The air blown out radially outward by the fan 275 passes through the axial fins 216. Therefore, heat can be suitably released from the axial fins 216 to the air blown outward in the radial direction by the fan 275. As a result, the heat dissipation of the motor 210 can be further improved.

　本発明は上述の実施形態に限られず、以下の構成を採用することもできる。ラティス構造は、梁が格子状に組み合わされた構造であれば、特に限定されず、図４に示す構造以外の構造であってもよい。複数の外側フィンのうち一部の外側フィンには、ラティス構造が設けられなくてもよい。例えば、第１実施形態においては、ラティス構造を有する径方向フィン１５と、ラティス構造を有しない径方向フィン１５とが、周方向に沿って交互に配置されてもよい。また、第１実施形態において軸方向フィン１６の少なくとも一部がラティス構造を有してもよい。この場合、軸方向フィン１６の外径をある程度大きくして、ラティス構造としやすくしてもよい。また、この場合、軸方向フィン１６は、例えば、円筒形状であってもよい。軸方向フィン１６の少なくとも一部をラティス構造とすることで、モータ１０の放熱性をより向上できる。 The present invention is not limited to the above-described embodiment, and the following configurations can also be adopted. The lattice structure is not particularly limited as long as it is a structure in which beams are combined in a grid pattern, and may be a structure other than the structure shown in FIG. A lattice structure may not be provided on some of the outer fins among the plurality of outer fins. For example, in the first embodiment, the radial fins 15 having a lattice structure and the radial fins 15 having no lattice structure may be alternately arranged along the circumferential direction. Further, in the first embodiment, at least a part of the axial fins 16 may have a lattice structure. In this case, the outer diameter of the axial fin 16 may be increased to some extent to facilitate the lattice structure. Further, in this case, the axial fin 16 may have a cylindrical shape, for example. By forming at least a part of the axial fins 16 in a lattice structure, the heat dissipation of the motor 10 can be further improved.

　複数の外側フィンは、互いに異なるラティス構造を有する外側フィンを含んでもよい。複数の内側フィンは、互いに異なるラティス構造を有する内側フィンを含んでもよい。異なるラティス構造とは、例えば、梁同士の隙間の大きさが異なるラティス構造等である。外側フィンおよび内側フィンの形状は、特に限定されず、上述した実施形態の形状以外の形状であってもよい。 The plurality of outer fins may include outer fins having different lattice structures from each other. The plurality of inner fins may include inner fins having different lattice structures from each other. The different lattice structures are, for example, lattice structures having different sizes of gaps between beams. The shapes of the outer fins and the inner fins are not particularly limited, and may be shapes other than the shapes of the above-described embodiments.

　上述した実施形態においてステータ保持部材は、ハウジングとしたが、これに限られない。ステータ保持部材は、ステータを保持する部材であればよい。上述した実施形態においてモータは、インナーロータ型のモータとしたが、これに限られない。モータは、アウターロータ型のモータであってもよい。この場合、ステータ保持部材は、ステータを保持するブラケット等であってもよい。モータがアウターロータ型のモータである場合、ステータ保持部材の外側面は、モータの外部に熱を放出可能な面であればよく、モータの外部に面する面等を含む。例えば、ステータ保持部材がブラケットであり、ブラケットが上側においてステータを保持する場合には、ステータ保持部材の外側面は、ブラケットの下側の面を含む。 In the above-described embodiment, the stator holding member is a housing, but the present invention is not limited to this. The stator holding member may be any member that holds the stator. In the above-described embodiment, the motor is an inner rotor type motor, but the motor is not limited to this. The motor may be an outer rotor type motor. In this case, the stator holding member may be a bracket or the like that holds the stator. When the motor is an outer rotor type motor, the outer surface of the stator holding member may be a surface capable of releasing heat to the outside of the motor, and includes a surface facing the outside of the motor and the like. For example, when the stator holding member is a bracket and the bracket holds the stator on the upper side, the outer surface of the stator holding member includes the lower surface of the bracket.

　モータの用途、回転翼装置の用途、および無人飛行体の用途は、特に限定されない。モータは、回転翼装置以外に搭載されるモータであってもよいし、無人飛行体以外に搭載されるモータであってもよい。回転翼装置は、無人飛行体以外に搭載される回転翼装置であってもよい。なお、本明細書において説明した各構成は、相互に矛盾しない範囲内において、適宜組み合わせることができる。 The use of the motor, the use of the rotorcraft, and the use of the unmanned aerial vehicle are not particularly limited. The motor may be a motor mounted on a motor other than the rotary wing device, or may be a motor mounted on a motor other than the unmanned aerial vehicle. The rotary wing device may be a rotary wing device mounted on a vehicle other than the unmanned aerial vehicle. In addition, each configuration described in this specification can be appropriately combined within a range that does not contradict each other.

　１，２０１…回転翼装置、２…プロペラ、１０，１１０，２１０…モータ、１１，２１１…ハウジング（ステータ保持部材）、１４…外側フィン、１５，１１５…径方向フィン、１６，２１６…軸方向フィン、２０…ロータ、２１…シャフト、３０，２３０…ステータ、３５…コイル、７０…プロペラ取付部、１１５ａ…第１部分、１１５ｂ…第２部分、２１７…内側フィン、２６０…密閉室、１０００…無人飛行体、ＣＭ…冷却媒体、Ｊ…中心軸 1,201 ... Rotor blade device, 2 ... Propeller, 10,110,210 ... Motor, 11,211 ... Housing (stator holding member), 14 ... Outer fin, 15,115 ... Radial fin, 16,216 ... Axial direction Fins, 20 ... rotors, 21 ... shafts, 30, 230 ... stators, 35 ... coils, 70 ... propeller mounting parts, 115a ... first part, 115b ... second parts, 217 ... inner fins, 260 ... closed chambers, 1000 ... Unmanned aircraft, CM ... Cooling medium, J ... Central axis

Claims (8)

　中心軸を中心として回転可能なロータと、
　前記ロータと隙間を介して径方向に対向するステータと、
　前記ステータを保持するステータ保持部材と、
　を備え、
　前記ステータ保持部材は、前記ステータ保持部材の外側面に設けられた複数の外側フィンを有し、
　前記複数の外側フィンの少なくとも一部は、ラティス構造を有する、モータ。 A rotor that can rotate around the central axis and
A stator facing the rotor in the radial direction through a gap,
A stator holding member that holds the stator,
With
The stator holding member has a plurality of outer fins provided on the outer surface of the stator holding member.
A motor in which at least a part of the plurality of outer fins has a lattice structure. 　前記ステータは、前記ロータの径方向外側において前記ロータを囲み、
　前記ステータ保持部材は、前記ロータおよび前記ステータを内部に収容するハウジングであり、
　前記複数の外側フィンは、前記ハウジングの外周面に設けられる複数の径方向フィンを含み、
　前記複数の径方向フィンの少なくとも一部は、ラティス構造を有する、請求項１に記載のモータ。 The stator surrounds the rotor on the radial outer side of the rotor.
The stator holding member is a housing for accommodating the rotor and the stator inside.
The plurality of outer fins include a plurality of radial fins provided on the outer peripheral surface of the housing.
The motor according to claim 1, wherein at least a part of the plurality of radial fins has a lattice structure. 　前記ロータは、
　前記中心軸に沿って配置され、軸方向一方側の端部が前記ハウジングよりも軸方向一方側に突出するシャフトと、
　前記シャフトのうち前記ハウジングよりも軸方向一方側に突出する部分に設けられ、プロペラが取り付けられるプロペラ取付部と、
　を有する、請求項２に記載のモータ。 The rotor
A shaft that is arranged along the central axis and whose end on one side in the axial direction protrudes on one side in the axial direction from the housing.
A propeller mounting portion provided on a portion of the shaft that protrudes on one side in the axial direction from the housing and to which a propeller is mounted.
2. The motor according to claim 2. 　前記複数の径方向フィンの少なくとも１つは、
　ラティス構造を有する第１部分と、
　前記第１部分の軸方向他方側に繋がり、非ラティス構造を有する第２部分と、
　を有する、請求項３に記載のモータ。 At least one of the plurality of radial fins
The first part with a lattice structure and
A second portion connected to the other side in the axial direction of the first portion and having a non-lattice structure,
The motor according to claim 3. 　前記複数の外側フィンは、前記ハウジングの軸方向一方側の面に設けられる複数の軸方向フィンを含み、
　前記複数の軸方向フィンの少なくとも一部は、ラティス構造を有する、請求項２から４のいずれか一項に記載のモータ。 The plurality of outer fins include a plurality of axial fins provided on one side surface of the housing in the axial direction.
The motor according to any one of claims 2 to 4, wherein at least a part of the plurality of axial fins has a lattice structure. 　前記ステータは、複数のコイルを有し、
　前記ステータ保持部材は、前記コイルが収容される密閉室を有し、
　前記密閉室には、冷却媒体が収容され、
　前記ステータ保持部材は、前記密閉室の内側面に設けられる複数の内側フィンを有し、
　前記複数の内側フィンの少なくとも一部は、ラティス構造を有する、請求項１から５のいずれか一項に記載のモータ。 The stator has a plurality of coils
The stator holding member has a closed chamber in which the coil is housed.
A cooling medium is housed in the closed chamber.
The stator holding member has a plurality of inner fins provided on the inner surface of the closed chamber.
The motor according to any one of claims 1 to 5, wherein at least a part of the plurality of inner fins has a lattice structure. 　請求項１から６のいずれか一項に記載のモータを備える、回転翼装置。 A rotary wing device including the motor according to any one of claims 1 to 6. 　請求項７に記載の回転翼装置を備える、無人飛行体。 An unmanned aerial vehicle equipped with the rotorcraft according to claim 7.
PCT/JP2020/000563 2019-03-28 2020-01-10 Motor, rotary wing device, and unmanned flying body Ceased WO2020195004A1 (en)

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