JP6524342B2 - Motor and air conditioner - Google Patents

Description

  The present invention relates to a motor provided with a rotor having a rotor magnet and an air conditioner provided with the motor.

  The rotor described in Patent Document 1 includes an annular rotor magnet and an annular position detection magnet disposed at one end of the rotor magnet. The rotor magnet includes an annular yoke formed of a resin containing soft magnetic powder or ferrite powder, and an annular resin magnet portion formed on the outer peripheral surface of the yoke and formed of a resin containing rare earth magnetic powder.

  Here, the yoke includes, on one end surface thereof, a plurality of grooves extending radially from the inner circumferential surface of the yoke to the outer circumferential surface of the yoke. The plurality of grooves serve as injection paths for the resin containing the rare earth magnetic powder when the resin magnet portion is formed, and are respectively filled with the plurality of rib runners.

  On the other hand, the resin magnet portion has a plurality of pedestals on which the position detection magnets are mounted, and a plurality of projections which are respectively disposed outside the plurality of pedestals and hold the position detection magnets from the outside on one end surface thereof. Prepare. The plurality of pedestals and the plurality of protrusions are formed via the plurality of rib-like runners described above.

JP, 2011-120334, A

  In general, since the cost increases as the amount of use of the rare earth magnetic powder increases, it is desirable to reduce the amount of use of the rare earth magnetic powder.

  The present invention has been made in view of the above, and it is an object of the present invention to obtain a motor capable of reducing the amount of rare earth magnetic powder used for a rotor magnet.

  In order to solve the problems described above and to achieve the object, a motor according to the present invention is a position detection at an end of an annular first magnet and one end of the first magnet in the axial direction of the first magnet A motor having a rotor having an annular second magnet, the first magnet comprising: a first annular layer formed of a resin containing at least one of soft magnetic powder and ferrite powder; And a second annular layer disposed on the outer circumferential surface of the first annular layer and formed of a resin containing rare earth magnetic powder, wherein the first annular layer is the periphery of the first magnet. The end face having a plurality of grooves arranged in a direction is formed in the axial direction, and each of the plurality of grooves extends from an inner circumferential surface of the first annular layer to an outer circumferential surface of the first annular layer It extends in the radial direction of the first magnet, The second annular layer has a plurality of rib portions disposed in the plurality of grooves and extending from the inner circumferential surface of the second annular layer, and the length of each of the plurality of rib portions in the radial direction is It is smaller than the length of each of the plurality of grooves in the radial direction.

  According to the present invention, it is possible to reduce the amount of rare earth magnetic powder used for the rotor magnet.

A perspective view showing the configuration of the yoke in the first embodiment Another perspective view showing the configuration of the yoke in the first embodiment A perspective view showing a configuration of a rotor magnet in Embodiment 1 Another perspective view showing the configuration of the rotor magnet in the first embodiment The perspective view which shows the structure of the rotor magnet with a runner in Embodiment 1. A perspective view showing a method of assembling a rotor according to Embodiment 1 The perspective view which shows the structure of the rotor which concerns on Embodiment 1. A longitudinal sectional view showing a configuration of a motor according to Embodiment 1 The figure which shows an example of a structure of the air conditioner which concerns on Embodiment 2.

  Hereinafter, a motor and an air conditioner according to an embodiment of the present invention will be described in detail based on the drawings. The present invention is not limited by the embodiment.

Embodiment 1
FIG. 1 is a perspective view showing the configuration of the yoke in the present embodiment, FIG. 2 is another perspective view showing the configuration of the yoke in the present embodiment, and FIG. 3 is a configuration of a rotor magnet in the present embodiment 4 is another perspective view showing the configuration of the rotor magnet in the present embodiment, FIG. 5 is a perspective view showing the configuration of the rotor magnet with a runner in the present embodiment, FIG. These are perspective views which show the assembly method of the rotor which concerns on this Embodiment, FIG. 7 is a perspective view which shows the structure of the rotor which concerns on this Embodiment.

  First, the configuration of the yoke 1 will be described mainly with reference to FIGS. 1 and 2. The yoke 1 is a first annular layer. The yoke 1 is formed of a resin containing at least one of soft magnetic powder and ferrite powder. Here, the resin is a thermoplastic resin, for example, nylon. The yoke 1 is obtained by injection molding of a resin containing at least one of soft magnetic powder and ferrite powder.

  The yoke 1 has a cylindrical portion 2 which is a first cylindrical portion. The cylindrical portion 2 has end faces 3a and 3b which are first and second end faces which are arranged to be separated from each other in the axial direction. The end faces 3 a and 3 b are end faces of the cylindrical portion 2. The end face 3 a axially faces the sensor magnet 22 described later. The cylindrical portion 2 has an outer peripheral surface 4 a and an inner peripheral surface 4 b which are disposed to be separated from each other in the radial direction. The first tubular portion may not be cylindrical, and for example, the outer periphery may be corrugated.

  Here, the “axial direction” is the axial direction of the rotor magnet 15 described later. Since the yoke 1 is disposed coaxially with the rotor magnet 15, the axial direction of the rotor magnet 15 is the axial direction of the yoke 1. Further, the axial direction of the rotor magnet 15 is also the axial direction of the rotor 30 described later. Similarly, the “radial direction” is the radial direction of the rotor magnet 15, is also the radial direction of the yoke 1, and is also the radial direction of the rotor 30.

  The yoke 1 has a plurality of pedestals 5 on the end face 3a. The plurality of pedestals 5 are arranged at equal intervals in the circumferential direction. Here, the “circumferential direction” is the circumferential direction of the rotor magnet 15 and is also the circumferential direction of the yoke 1 and also the circumferential direction of the rotor 30.

  The plurality of pedestals 5 are disposed at the positions of the plurality of magnetic poles, respectively. In the illustrated example, the number of pedestals 5 is ten, and the number of magnetic poles of the rotor 30 is ten. The sensor magnets 22 are mounted on the plurality of pedestals 5. The plurality of pedestals 5 are integrally formed with the cylindrical portion 2.

  The yoke 1 has a plurality of protrusions 7 on the end face 3a. The protrusions 7 are disposed outside the pedestal 5 in the radial direction. The height of the projection 7 is larger than the height of the pedestal 5. Here, the height of the projection 7 is the height from the end face 3 a in the axial direction. The same applies to the height of the pedestal 5. The protrusion 7 is integrally formed with the pedestal 5.

  The yoke 1 has a plurality of connecting portions 6 on the end face 3a. The connecting portion 6 is disposed between the pedestals 5 adjacent to each other in the circumferential direction, and couples the pedestals 5 adjacent to each other in the circumferential direction. Two pedestals 5 adjacent to each other in the circumferential direction are respectively a first pedestal and a second pedestal. The projections 7 disposed radially outside the first pedestal are first projections, and the projections disposed radially outside the second pedestal are second projections. The plurality of connecting portions 6 and the plurality of pedestals 5 are alternately arranged in the circumferential direction, and the plurality of connecting portions 6 integrally connect the plurality of pedestals 5. The plurality of connecting portions 6 are integrally formed with the plurality of pedestals 5. The plurality of pedestals 5 are reinforced by the plurality of connecting portions 6. Thereby, the quality of the yoke 1 can be improved.

  The height of the connecting portion 6 is smaller than the height of the pedestal 5. Here, the height of the connecting portion 6 is the height from the end face 3 a in the axial direction. Moreover, the connection part 6 is spaced apart and arrange | positioned from both the outer peripheral surface 4a and the inner peripheral surface 4b in radial direction. Specifically, the connecting portion 6 is disposed at the center of the end face 3a in the radial direction. The connection portion 6 is arc-shaped in plan view from the axial direction.

  The yoke 1 has a plurality of recesses 8 at the outer peripheral edge of the end face 3a. That is, the plurality of recesses 8 are formed in the cylindrical portion 2. The plurality of recesses 8 are arranged at equal intervals in the circumferential direction. The recess 8 is disposed between the magnetic poles. That is, the recess 8 is disposed between the protrusions 7 adjacent to each other in the circumferential direction. The recess 8 is semicircular in plan view from the axial direction. The recess 8 is formed at a constant depth in the axial direction from the end face 3a. The recess 8 is concave with respect to both the end face 3a and the outer peripheral surface 4a. As described later, the plurality of concave portions 8 function as a rotation stopper for the resin magnet portion 16 formed on the outer peripheral surface 4 a of the yoke 1. The recess 8 is a first recess.

  The yoke 1 has a plurality of recesses 10 arranged at equal intervals in the circumferential direction on the end face 3 b. The recess 10 is disposed between the magnetic poles. The recess 10 is disposed between the pedestals 5 in a plan view from the axial direction. The number of recesses 10 is equal to the number of magnetic poles. The recess 10 is circular in plan view from the axial direction. The recess 10 is a second recess. At the center of the recess 10, a gate mark 10a is disposed. The gate mark 10a is a processing mark of a gate opening for injecting a resin containing at least one of soft magnetic powder and ferrite powder. By making the number of gate ports equal to the number of magnetic poles in this manner, the injection state of the above-described resin is made uniform with respect to the magnetic poles, the orientation state of the magnetic field is also made uniform, and the quality of the yoke 1 is improved.

  Further, the gate port is disposed between the pedestals 5 in a plan view from the axial direction. As a result, the position of the pedestal 5 becomes the weld position, and a sufficient thickness can be secured for the pedestal 5.

  The recess 10 has a depth such that the gate mark 10a does not come out of the end face 3b. As a result, the burrs remaining on the gate mark 10a are not exposed from the end face 3b, and the quality of the yoke 1 is improved.

  The yoke 1 has a plurality of grooves 11 arranged at equal intervals in the circumferential direction on the end face 3 b. The grooves 11 are disposed between the recesses 10 adjacent to each other in the circumferential direction. That is, the plurality of grooves 11 and the plurality of recesses 10 are alternately arranged in the circumferential direction. The groove 11 extends in the radial direction from the inner circumferential surface 4 b to the outer circumferential surface 4 a. The plurality of grooves 11 radially extend from the center of the yoke 1 in plan view from the axial direction. The plurality of grooves 11 are respectively disposed at the positions of the plurality of magnetic poles. As described later, when the resin magnet portion 16 is formed on the outer peripheral surface 4 a of the yoke 1, the groove 11 serves as an injection path for the resin containing the rare earth magnetic powder.

  Inside the yoke 1, a hollow portion is formed by the inner circumferential surface 4b. The inner circumferential surface 4b includes a tapered portion 4b1 disposed on the end face 3a side and a straight portion 4b2 disposed on the end face 3b side. Here, the tapered portion 4b1 has a tapered shape in which the inner diameter decreases in the axial direction from the end face 3a to the end face 3b. The straight portion 4b2 has a constant inner diameter regardless of the axial position. The tapered portion 4b1 is formed of a movable mold among the molds (not shown), and the straight part 4b2 is formed of the fixed mold among the molds (not shown). Here, the mold is a mold for forming the yoke 1.

  The yoke 1 has a plurality of notches 12 on the inner peripheral edge of the end face 3b. The plurality of notches 12 are arranged at equal intervals in the circumferential direction. The notches 12 are disposed between the magnetic poles. The notch 12 has a constant circumferential width and is inclined with respect to the axial direction.

  The yoke 1 can be oriented in polar anisotropy. That is, when the yoke 1 is formed, a magnet is disposed around the mold and an orientation magnetic field is applied to the yoke 1 so that the soft magnetic powder or ferrite powder contained in the yoke 1 is anisotropically with respect to the pole direction. It is oriented. Since the magnetic flux is concentrated at the center of the magnetic pole by the polar anisotropic orientation, the magnetic force can be enhanced.

  Next, the configuration of the rotor magnet 15 will be described mainly with reference to FIGS. 3 and 4. The rotor magnet 15 has a yoke 1 and a resin magnet portion 16 disposed on the outer peripheral surface 4 a of the yoke 1. The rotor magnet 15 is annular.

  The resin magnet portion 16 is a second annular layer. The resin magnet portion 16 is formed of a resin containing rare earth magnetic powder. Here, the rare earth magnetic powder is, for example, samarium iron nitrogen (SmFeN) magnet powder or neodymium magnet powder. The resin is a thermoplastic resin, for example nylon. The resin magnet portion 16 is obtained by injection molding of a resin containing rare earth magnetic powder. The resin magnet portion 16 is integrally formed on the outer peripheral surface 4 a of the yoke 1. Below, resin containing rare earth magnetic powder is called resin magnet.

  The resin magnet portion 16 has a cylindrical portion 21 which is a second cylindrical portion. The cylindrical portion 21 has end faces 21a and 21b which are third and fourth end faces which are arranged to be separated from each other in the axial direction. The end face 21a is disposed at the position of the end face 3a in the axial direction. That is, the end face 21a is flush with the end face 3a. The end face 21 b is disposed at the position of the end face 3 b in the axial direction. That is, the end face 21b is flush with the end face 3b. The cylindrical portion 21 has an outer peripheral surface 21 c and an inner peripheral surface 21 d which are disposed apart from each other in the radial direction.

  The resin magnet portion 16 has a plurality of rib portions 20 connected to the cylindrical portion 21. The plurality of rib portions 20 are disposed in the groove 11 respectively. The plurality of rib portions 20 are disposed at the positions of the plurality of magnetic poles, respectively. The rib portion 20 extends radially inward from the inner circumferential surface 21 d of the cylindrical portion 21 by a constant length. The length of the rib portion 20 in the radial direction is smaller than the length of the groove 11 in the radial direction. That is, the rib portion 20 has the end surface 20 a which does not reach the inner peripheral surface 4 b of the yoke 1 in the radial direction. In other words, the tip end surface 20a is disposed radially outward of the inner circumferential surface 4b.

  The resin magnet portion 16 has a plurality of convex portions 19 on the inner circumferential surface 21 d of the cylindrical portion 21. The plurality of convex portions 19 engage with the plurality of concave portions 10 provided in the yoke 1 respectively.

  Next, an outline of a method of manufacturing the rotor magnet 15 will be described with reference to FIGS. 1 to 5. The resin magnet portion 16 is formed integrally with the yoke 1 by storing the yoke 1 in a mold (not shown) and injecting the resin magnet to the yoke 1. Here, the mold is a mold for molding the resin magnet portion 16.

  When the resin magnet portion 16 is formed, magnets are arranged around the mold and an orientation magnetic field is applied to the resin magnet portion 16 so that the rare earth magnetic powder contained in the resin magnet portion 16 is different in the pole direction. It is oriented dimensionally.

  Among the molds, the movable and stationary molds have a core portion into which the hollow portion of the yoke 1 is inserted. The yoke 1 is inserted into the core from the end face 3a side and is incorporated into the movable side mold. As described above, the inner circumferential surface 4b of the yoke 1 has the straight portion 4b2. By suppressing the gap between the straight portion 4b2 and the core portion, leakage of the resin magnet to the gap is suppressed, and the quality of the rotor magnet 15 is improved.

  The movable-side mold has a plurality of recesses in which the plurality of projections 7 of the yoke 1 are respectively fitted. Thereby, when applying an orientation magnetic field to the resin magnet part 16, positioning of the yoke 1 with respect to the position of the magnet which produces | generates an orientation magnetic field is performed.

  Inside the yoke 1 is formed a doughnut-shaped runner 17 to be a resin magnet injection path. The donut shaped runner 17 is formed on the end face of the core of the movable and stationary molds. The doughnut-shaped runner 17 has a plurality of resin injection parts 14 arranged at equal intervals in the circumferential direction. The number of resin injection parts 14 is half the number of magnetic poles.

  A plurality of rib-shaped runners 18 extend in the radial direction from the outer peripheral surface of the doughnut-shaped runner 17. The number of rib-like runners 18 is the same as the number of grooves 11 and the same as the number of magnetic poles. The plurality of ribbed runners 18 are disposed in the plurality of grooves 11 respectively. The width of the ribbed runner 18 is equal to the width of the groove 11, and the height of the ribbed runner 18 is equal to the depth of the groove 11. The plurality of rib-like runners 18 serve as injection paths for the resin magnet, like the donut-like runners 17. By making the number of rib-like runners 18 equal to the number of magnetic poles, the injection state of the resin magnet is made uniform with respect to the magnetic poles, the orientation state of the magnetic field is also made uniform, and the quality of the rotor magnet 15 can be improved.

  The resin magnet flows onto the outer peripheral surface 4 a of the yoke 1 from the plurality of resin injection portions 14 sequentially through the doughnut-shaped runner 17 and the plurality of rib-shaped runners 18. Thereby, the cylindrical portion 21 is formed. Further, the resin magnet is filled in the plurality of concave portions 8 provided on the end face 3 a of the yoke 1. As a result, on the inner circumferential surface 21 d of the cylindrical portion 21, a plurality of convex portions 19 which are respectively fitted to the plurality of concave portions 8 are formed.

  As described above, the resin magnet is integrally formed on the yoke 1, and the rotor magnet 15a with a runner shown in FIG. 5 is obtained. Thereafter, the rib-like runner 18 is cut, and a part of the rib-like runner 18 remains in the groove 11 to become the rib portion 20, and the remaining part of the rib-like runner 18 is removed together with the doughnut-like runner 17. Thus, the rotor magnet 15 shown in FIGS. 3 and 4 is obtained.

  In addition, although illustration is abbreviate | omitted, the axial direction runner is connected with the some resin injection part 14, respectively. As in the illustrated example, by reducing the number of resin injection portions 14 to half the number of magnetic poles, the total runner amount can be reduced as compared to the case where the number of resin injection portions 14 is set to the number of magnetic poles. In addition, when runners that are not used in products are reused, the total amount of runners decreases, so that the reuse ratio decreases, the deterioration of the physical properties of the resin magnet is suppressed, and the product quality can be improved. Here, the physical properties of the resin magnet are mainly mechanical strength characteristics.

  Next, the configuration of the rotor 30 according to the present embodiment will be described mainly with reference to FIGS. 6 and 7. The rotor 30 includes a rotor magnet 15, a sensor magnet 22 which is an annular position detection magnet disposed at one end of the rotor magnet 15 in the axial direction, and a shaft 28 passing through the rotor magnet 15 and the sensor magnet 22. And the resin part 31 which integrates the rotor magnet 15, the sensor magnet 22, and the shaft 28 together. Here, the resin portion 31 is formed of a thermoplastic resin, and the thermoplastic resin is, for example, polybutylene terephthalate. The rotor magnet 15 is a first magnet, and the sensor magnet 22 is a second magnet.

  The sensor magnets 22 are mounted on the plurality of pedestals 5. The sensor magnet 22 is disposed coaxially with the rotor magnet 15. The sensor magnet 22 is provided with level | step difference 25a, 25b in the both ends of the internal peripheral surface in an axial direction. The sensor magnet 22 has an axially symmetrical shape. The steps 25 a and 25 b are covered by the resin portion 31 to prevent the sensor magnet 22 from coming off in the axial direction. The sensor magnet 22 is provided with a plurality of rib portions 26 arranged in the circumferential direction on the inner circumferential surface. In addition, the structure which provides only any one among level | step difference 25a, 25b is also possible. The plurality of rib portions 26 are covered by the resin portion 31 and serve as a circumferential rotation stop of the sensor magnet 22.

  The resin portion 31 has a cylindrical portion 23 formed on the outer peripheral surface of the shaft 28, a cylindrical portion 24 formed on the inner peripheral surface of the yoke 1, and a circumferential direction, and the cylindrical portion 23 and the cylindrical portion 24 have diameters. A plurality of rib portions 32 connected in a direction, and a plurality of gate convex portions 33 connected to the cylindrical portion 24 and disposed between the adjacent rib portions 32 are provided.

  The gate convex portion 33 extends in the radial direction by a length which does not reach the cylindrical portion 24 from the cylindrical portion 23. The gate convex portion 33 serves as an injection port of the thermoplastic resin. The thermoplastic resin is directly injected from the gate convex portion 33 to the outer peripheral surface of the shaft 28, and the cylindrical portion 23 can be filled most quickly. As a result, the weld strength of the cylindrical portion 23 can be improved, and the quality of the rotor 30 can be improved.

  In the illustrated example, the number of rib portions 32 and the number of gate convex portions 33 are each half the number of magnetic poles. The number, thickness and length of the rib portions 32 are not limited to the illustrated example. The same applies to the gate convex portion 33.

  The resin portion 31 fills a plurality of gaps formed between the plurality of connection portions 6 and the sensor magnet 22. In addition, the resin portion 31 fills the protrusion 7 in the axial direction by a fixed height from the end face 3a. A part of the protrusion 7 is exposed from the resin portion 31. Furthermore, the resin portion 31 couples the protrusions 7 adjacent to each other in the circumferential direction. Since the plurality of projections 7 are exposed from the resin portion 31, the plurality of projections 7 can also be used for positioning when the rotor 30 is magnetized.

  Next, an outline of a method of manufacturing the rotor 30 will be described. First, the rotor magnet 15 is installed in the lower mold of the mold of the vertical forming machine. The rotor magnet 15 is incorporated into the lower mold from the end face 3 b side where the notch 12 is provided. At this time, the rotor magnet 15 is incorporated into the lower mold so that the notch 12 is fitted to the convex portion of the mold. Thereby, the coaxiality of the rotor magnet 15 and the shaft 28 is ensured after molding.

  Subsequently, the shaft 28 is installed at the center of the rotor magnet 15, the sensor magnet 22 is installed on the plurality of pedestals 5, and the sensor magnet 22 is held by the plurality of projections 7. After the rotor magnet 15, the shaft 28, and the sensor magnet 22 are incorporated into the lower mold, the upper and lower molds of the mold are combined, and the thermoplastic resin is injected into the mold.

  The thermoplastic resin reaches the rotor magnet 15 and the sensor magnet 22 sequentially through the plurality of gate convex portions 33, the cylindrical portion 23, the plurality of rib portions 32, and the cylindrical portion 24. The thermoplastic resin passes through a plurality of gaps formed between the plurality of connection portions 6 and the sensor magnet 22 and is filled on the outer peripheral side of the plurality of pedestals 5 and the plurality of connection portions 6. At this time, the thermoplastic resin is filled in the axial direction so as to fill the protrusions 7 by a certain height from the end face 3a. However, the protrusions 7 are not embedded in the thermoplastic resin, and a part of the protrusions 7 are exposed from the thermoplastic resin. Further, the thermoplastic resin is filled in the plurality of gaps described above and is also filled so as to connect the protrusions 7 adjacent to each other in the circumferential direction. That is, the plurality of protrusions 7 are connected to each other by the resin portion 31. The transmission of the rotational torque of the rotor magnet 15 to the shaft 28 is improved by such a resin portion 31.

  Also, the thermoplastic resin is filled so as to fill the plurality of recesses 10 and the plurality of pedestals 5. Thereby, the transmission of torque is improved, and the resin portion 31 is prevented from rotating with respect to the rotor magnet 15. Moreover, even if the thermoplastic resin is molded and contracted in the radial direction, the resin portion 31 is caught by the plurality of concave portions 10 and the plurality of pedestals 5 to suppress the generation of a gap and to suppress the reduction in bonding strength. That is, by using the plurality of recesses 10 and the plurality of pedestals 5, it is not necessary to add a structure that suppresses the decrease in the bonding force, so that cost reduction and noise reduction can be achieved.

  By pressing the end faces 21a and 21b of the resin magnet portion 16 with a mold and filling it with a thermoplastic resin, the occurrence of burrs on the end faces 21a and 21b is suppressed, and no deburring work occurs, and productivity is improved. While improving, the quality of the product also improves.

  FIG. 8 is a longitudinal sectional view showing the configuration of the motor according to the present embodiment. The motor 40 includes an annular stator 41 and a rotor 30 disposed inside the stator 41. Here, the stator 41 is covered with a resin portion 42. The resin portion 42 is formed of a thermosetting resin. The thermosetting resin is, for example, a bulk molding compound. Bearings 44a and 44b are attached to the shaft 28 of the rotor 30. The bearing 44 a is fitted into a bracket 43 attached to the resin portion 42. The bearing 44 b is attached to the resin portion 42.

  As described above, in the present embodiment, the plurality of pedestals 5, the plurality of projections 7 and the plurality of connecting portions 6 are made of a resin containing at least one of soft magnetic powder and ferrite powder as a part of yoke 1. It is formed. As a result, the amount of rare earth magnetic powder used for the rotor magnet 15 can be reduced, and the manufacturing cost of the rotor 30 is also reduced.

  Further, in the present embodiment, a plurality of grooves 11 serving as a resin magnet injection path are formed on the end face 3b of the yoke 1, and ribbed runners 18 formed in the grooves 11 are cut away in the path. 20 are formed. Thereby, since a part of the rib-like runners 18 can be reused, the usage of the rare earth magnetic powder used for the rotor magnet 15 can be reduced. Further, since the injection path of the resin magnet is not formed on the pedestal 5, the structure of the pedestal 5 is simplified, the structure of the mold is also simplified, and the manufacturing cost is also reduced.

  In the present embodiment, the height of the connecting portion 6 is smaller than the height of the pedestal 5. Thereby, when integrating the rotor magnet 15, the sensor magnet 22, and the shaft 28 with thermoplastic resin, the injection path of the thermoplastic resin to the outer peripheral side of the pedestal 5 and the connecting portion 6 is secured between the pedestals 5. Can.

  Moreover, the connection part 6 is arrange | positioned in the center of the end surface 3a in radial direction. Thereby, the thickness of the portion on the inner peripheral side of the connecting portion 6 of the resin portion 31 and the thickness of the portion on the outer peripheral side of the connecting portion 6 of the resin portion 31 become equal, and the sinking at the time of molding is suppressed. The rotor 30 is strongly integrated, and the quality of the rotor 30 can be improved.

  In the present embodiment, the resin portion 31 fills the protrusion 7 at a fixed height from the end face 3 a in the axial direction. Further, the resin portion 31 connects the plurality of protrusions 7 to each other. Thereby, the rotor 30 is firmly integrated, and the quality of the rotor 30 can be improved.

  In the present embodiment, a plurality of recesses 8 are formed on the outer peripheral edge of the end face 3 a of the yoke 1. When the resin magnet portion 16 is formed on the outer peripheral surface 4 a of the yoke 1, the resin magnet is injected into the plurality of concave portions 8, and the plurality of convex portions 19 which are a part of the resin magnet portion 16 To fit. As a result, the resin magnet portion 16 is rotationally locked in the circumferential direction with respect to the yoke 1. In particular, when the outer periphery of the yoke 1 is a perfect circle, the plurality of recesses 8 and the plurality of projections 19 are effective for preventing rotation and transmitting torque, and the quality of the rotor 30 can be improved. .

  The resin magnet is filled in the plurality of grooves 11 to form a plurality of rib portions 20. The plurality of rib portions 20 prevent rotation of the resin magnet portion 16 with respect to the yoke 1 and torque transmission of the rotor 30 is improved. Further, the plurality of rib portions 20 suppress positional deviation of the resin magnet portion 16 in the axial direction.

  A part of the projection 7 is exposed from the rotor 30. Therefore, the plurality of protrusions 7 can be used as positioning when the rotor 30 is magnetized.

  In the present embodiment, the height of the ribbed runner 18 is equal to the depth of the groove 11. Therefore, the upper end surface of the rib portion 20 obtained by cutting out a part of the rib-like runner 18 is disposed at the position of the end surface 3 b of the yoke 1 in the axial direction. Further, the end face 21 b of the resin magnet portion 16 is disposed at the position of the end face 3 b of the yoke 1 in the axial direction. Therefore, the resin magnet portion 16 does not have a shape that is convex outward in the axial direction from the end face 3 b of the yoke 1. Thereby, when integrating the rotor magnet 15, the sensor magnet 22, and the shaft 28 with thermoplastic resin, it is possible to suppress the thickness of the resin provided outside the end surface 3b of the yoke 1 in the axial direction. Cost can be reduced.

  In the present embodiment, the plurality of grooves 11 of the yoke 1 are used as the injection path of the resin magnet. Thereby, the injection | pouring path | route of a resin magnet is simplified, and the improvement of the quality of the resin magnet part 16 is achieved.

Second Embodiment
FIG. 9 is a diagram showing an example of the configuration of the air conditioner according to the present embodiment. The air conditioner 300 includes an indoor unit 301 and an outdoor unit 302 connected to the indoor unit 301. The indoor unit 301 has a blower 303. The outdoor unit 302 has a blower 304 and a compressor 305. Each of the blowers 303 and 304 and the compressor 305 has the electric motor of the first embodiment. Thereby, cost reduction and quality improvement of the air conditioner 300 can be achieved.

  In addition, the motor of Embodiment 1 can also be mounted in electrical equipment other than an air conditioner, and also in this case, the same effect as that of the present embodiment can be obtained.

  The configuration shown in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and one of the configurations is possible within the scope of the present invention. Parts can be omitted or changed.

  DESCRIPTION OF SYMBOLS 1 yoke, 2, 21, 23, 24 cylindrical part, 3a, 3b, 21a, 21b end surface, 4a, 21c outer peripheral surface, 4b, 21d inner peripheral surface, 4b 1 taper part, 4b 2 straight part, 5 pedestals, 6 connection parts, Reference Signs List 7 protrusion 8, 10 recess, 10a gate mark, 11 groove, 12 notch, 14 resin injection portion, 15 rotor magnet, 16 resin magnet portion, 19 protrusion, 20, 26, 32 rib portion, 20a tip surface, Reference Signs List 22 sensor magnet, 25a, 25b step, 28 shaft, 30 rotor, 31, 42 resin portion, 33 gate convex portion, 40 motor, 41 stator, 43 bracket, 44a, 44b bearing, 300 air conditioner, 301 indoor unit , 302 outdoor unit, 303, 304 blower, 305 compressor.

Claims (5)

A motor comprising a rotor having a first ring-shaped magnet and a second ring-shaped position detecting magnet disposed at one end of the first magnet in the axial direction of the first magnet,
The first magnet is
A first annular layer formed of a resin containing at least one of a soft magnetic powder and a ferrite powder;
A second annular layer disposed on the outer circumferential surface of the first annular layer and formed of a resin containing a rare earth magnetic powder;
The first annular layer has an end face in which a plurality of grooves arranged in the circumferential direction of the first magnet are formed in the axial direction,
Each of the plurality of grooves extends in the radial direction of the first magnet from the inner circumferential surface of the first annular layer to the outer circumferential surface of the first annular layer,
The second annular layer includes a plurality of rib portions disposed in the plurality of grooves and extending from an inner circumferential surface of the second annular layer.
The motor according to claim 1, wherein a length of each of the plurality of rib portions in the radial direction is smaller than a length of each of the plurality of grooves in the radial direction. The first annular layer is
And another end face opposed to the second magnet and disposed in the axial direction so as to be separated from the end face;
First and second pedestals disposed on the other end surface and arranged in the circumferential direction, and on which the second magnet is mounted;
The first end face is disposed on the other end face, and connects the first and second pedestals, and the height from the other end face in the axial direction is the first and second ends from the other end face in the axial direction. The motor according to claim 1, further comprising: a connecting portion smaller than the height of each of the two pedestals. The first annular layer has a recess formed on the outer peripheral edge of the other end surface,
The electric motor according to claim 2, wherein the second annular layer has a protrusion that fits with the recess. The first annular layer is
The end face is disposed on the end face, and is disposed outside the first and second pedestals in the radial direction of the first magnet, and each height from the end face in the axial direction is the end face in the axial direction First and second projections larger than the height of each of the first and second pedestals from
It said first and second protrusions are arranged at positions of the magnetic poles of the rotor,
The motor according to claim 3, wherein the recess is disposed between the first and second protrusions. An air conditioner comprising the motor according to any one of claims 1 to 4.

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