JP6439281B2 - Landel motor - Google Patents

Description

  The present invention relates to a Landel motor.

  As one type of motor, for example, there are Landel motors as shown in Patent Document 1 and Patent Document 2. The rotor used in the Landell motor includes a pair of rotor cores and field magnets (permanent magnets) each having a plurality of claw-shaped magnetic poles in the circumferential direction, and the claw-shaped magnetic poles of the pair of rotor cores are alternately arranged in the circumferential direction. By disposing the magnets between the pair of rotor cores, the claw-shaped magnetic poles function alternately as different magnetic poles.

JP 2012-115085 A JP 2013-222024 A

  By the way, the claw-shaped magnetic pole of the rotor is bent in the axial direction after once protruding radially outward from the peripheral edge thereof with respect to the disk-shaped (flat plate in the direction orthogonal to the axis) core base that constitutes a part of the rotor core. It is formed to extend along the axial direction. Patent Document 2 discloses a rotor structure in which the tip of the claw-shaped magnetic pole is further extended (protruded in the axial direction) from the core base of the mating rotor core to increase the output of the motor. Has been made. The inventors have studied not only the structure of the rotor as described above but also the structure of the motor including the stator side, with the aim of further increasing the output of the motor.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a Landell motor that can optimize the structural relationship between a rotor and a stator and achieve high output.

A Landell motor that solves the above-described problem is configured by a stator in which a winding is wound around a tooth extending inward in the radial direction of the stator core via an insulator, and is rotatable inside the tip of the tooth. The rotor includes a first and a second rotor core in which a plurality of claw-shaped magnetic poles projecting radially outward from the outer peripheral portion of the core base and extending in the axial direction are formed at equal intervals in the circumferential direction; Using a field magnet magnetized in the axial direction, arranging the field magnets between the axial directions of the core bases of the first and second rotor cores, and combining the claw-shaped magnetic poles so as to enter each other, a Lundell motor forming the rotor structure to the respective claw-shaped magnetic poles circumferentially alternately different magnetic poles, in both sides in the axial direction, the axial extending portions of the claw-shaped magnetic pole and the magnetic pole portion Of and the tip of the magnetic pole portion but also to protrude from the axial end position of the core based counterpart of the rotor core, and the axial end position of the core based the mating side of the rotor core than the axial end position of the teeth Is also axially inner, and on both sides in the axial direction, the tip of the magnetic pole portion of the claw-shaped magnetic pole is equal to or axially inner than the axial end position of the winding wound around the teeth. The tip of the magnetic pole part of the claw-shaped magnetic pole that protrudes longer than the axial end position of the teeth on both sides in the axial direction is formed on the insulator. And facing in the radial direction.

According to this configuration, on both sides in the axial direction, the magnetic pole portion that is the axially extending portion of the claw-shaped magnetic pole has a configuration in which the tip portion protrudes from the axial end position of the core base of the mating rotor core. . And the front-end | tip part of this magnetic pole part protrudes longer than the axial direction end position of a tooth | gear in the axial direction inside or equal to the axial direction end position of the coil | winding wound by the teeth. As a result, the magnetic flux that spreads outward from the tip of the tooth in the axial direction and can leak can be made effective at the magnetic pole portion of the claw-shaped magnetic pole protruding in the axial direction. That is, the magnetic path between the rotor and the stator is expanded and the amount of effective magnetic flux is increased, which contributes to higher output of the motor. Further, on both sides in the axial direction, the magnetic pole portions of the claw-shaped magnetic poles protruding in the axial direction are equal to or axially inward of the axial end position of the winding wound around the teeth, that is, within the axial dimension of the stator. Therefore, the motor can be prevented from being enlarged.

  In the Landel motor, the rotor includes a back magnet on a radially inner side of the magnetic pole portion of the claw-shaped magnetic pole opposite to the teeth, and an axial end position of the back magnet is It is preferable to set the inner side in the axial direction than the axial end position of the teeth.

  According to this configuration, since the axial end position of the back magnet provided on the radially inner side of the magnetic pole portion of the claw-shaped magnetic pole is set to the axially inner side than the axial end position of the tooth, the shaft extends from the tip end portion of the tooth. The magnetic flux that spreads outward in the direction and leaks can be caused to act inward in the axial direction, which contributes to an increase in the effective magnetic flux amount and thus to higher output of the motor.

  According to the Landell type motor of the present invention, it is possible to optimize the structural relationship between the rotor and the stator, and to achieve high output.

It is the front view which looked at the Landell type brushless motor of an embodiment from the direction of an axis. It is a side view of the brushless motor of the same form. (A) is the sectional view on the AA line of the brushless motor of Drawing 1, (b) is an expanded sectional view in the position of the 2nd magnetic pole part, (c) is an expanded sectional view in the position of the 1st magnetic pole part. . It is a disassembled perspective view of the brushless motor of the same form. It is a perspective view of the rotor of the same form. It is a disassembled perspective view of the rotor of the same form. (A) is a sectional view of another example of a Landel-type brushless motor, (b) is an enlarged sectional view at the position of the second magnetic pole part, and (c) is an enlarged sectional view at the position of the first magnetic pole part. It is a perspective view of the rotor of the same example. It is a disassembled perspective view of the rotor of the another example.

Hereinafter, an embodiment of a Landell motor will be described.
The brushless motor M of the present embodiment shown in FIGS. 1 to 3 is a Landel motor, and is used for a position control device arranged in a vehicle engine room, more specifically, a valve timing variable device connected to the engine. It is.

  As shown in FIGS. 1 to 4, a motor case 1 of a brushless motor M includes a cylindrical front housing 2 made of a magnetic material formed in a covered cylindrical shape, and aluminum that closes an opening of the cylindrical front housing 2. And an end frame 3 made of (non-magnetic material).

  In the brushless motor M, a stator 5 is fixed to the inner peripheral surface of the cylindrical front housing 2, and a rotor 7 having a so-called Landel type structure that is fixed to the rotating shaft 6 and rotates integrally with the rotating shaft 6 inside the stator 5. Is arranged. The rotating shaft 6 is a non-magnetic stainless steel shaft that is housed and fixed in a bearing 8 that is housed and fixed in a bearing holder 2 a formed in the cylindrical front housing 2 and a bearing holder 3 a that is formed in the end frame 3. The bearing 9 supports the motor case 1 so as to be rotatable. The bearing 9 is made of a nonmagnetic material.

  An axially inner side surface 3 b (end surface on the rotor 7 side) of the end frame 3 has a planar shape orthogonal to the axis of the rotary shaft 6. The bearing holding portion 3a protrudes from the axial inner side surface 3b to the axial inner side (the rotor 7 side), and the bearing 9 fixed to the bearing holding portion 3a is closer to the rotor 7 than the axial inner side surface 3b. It is arranged to protrude.

  The tip of the rotating shaft 6 protrudes from the cylindrical front housing 2. The valve timing (the relative rotational phase of the camshaft with respect to the crankshaft of the engine) is appropriately changed by the rotational driving of the rotating shaft 6.

[Stator 5]
As shown in FIG. 3A, the stator 5 is fixed to the inner peripheral surface of the cylindrical front housing 2. The stator 5 has an annular stator core 11, and the outer peripheral surface of the stator core 11 is fixed to the inner side surface of the cylindrical front housing 2. On the inner side of the stator core 11, a plurality of teeth 12 formed along the axial direction and arranged at an equal pitch in the circumferential direction are formed to extend radially inward (see FIG. 4). Each tooth 12 is a T-shaped tooth, and the inner circumferential surface in the radial direction is an arc surface obtained by extending a concentric arc in the axial direction around the central axis O of the rotating shaft 6.

  Each tooth 12 is wound with three-phase windings (V-phase windings 15 in FIG. 3A) via insulators 13. Specifically, as shown in FIG. 4, the three teeth 12, that is, the U-phase winding 14, the V-phase winding 15, and the W-phase wire 16 are sequentially concentrated on the 12 teeth 12 in the circumferential direction. It is wound by winding. Then, a three-phase drive current is supplied to the wound windings 14, 15, 16 to form a rotating magnetic field in the stator 5, and the rotor 7 fixed to the rotating shaft 6 disposed inside the stator 5 is attached. It is designed to rotate forward and reverse.

[Rotor 7]
As shown in FIG. 3A, the rotor 7 fixed to the rotating shaft 6 is rotatably disposed inside the stator 5 (inside the tip end portion of the teeth 12). As shown in FIGS. 5 and 6, the rotor 7 includes first and second rotor cores 20 and 30 and a field magnet 40.

[First rotor core 20]
The first rotor core 20 is formed of an electromagnetic steel plate made of a soft magnetic material and is disposed on the end frame 3 side.

  The first rotor core 20 has a disk-shaped first core base 21, and a through hole 21 a is formed through the center position thereof. A substantially cylindrical boss portion 21d is formed to protrude from the outer peripheral portion of the through hole 21a on the end frame 3 side. The rotating shaft 6 is press-fitted into the through hole 21 a (boss portion 21 d), and the first core base 21 is pressure-bonded to the rotating shaft 6. At that time, the boss portion 21d is separated in the axial direction from the bearing 9 accommodated and fixed in the bearing holding portion 3a (see FIG. 3A).

  The first core base 21 is formed with four mounting holes 27 penetrating at equiangular intervals on a concentric circle with the central axis O as the center. The mounting hole 27 is provided for mounting the support plate 51 for holding the sensor magnet 61 (the protrusion on the support plate 51 side to be fitted into the mounting hole 27 is omitted).

  On the outer peripheral surface 21c of the first core base 21, four first claw-shaped magnetic poles 22 project radially outward at equal intervals and extend in the axial direction. Here, in the first claw-shaped magnetic pole 22, a portion protruding radially outward from the outer peripheral surface 21 c of the first core base 21 is referred to as a first base portion 23, and a tip portion bent in the axial direction is the first magnetic pole portion 24. That's it.

  Both circumferential end surfaces 22a and 22b of the first claw-shaped magnetic pole 22 composed of the first base portion 23 and the first magnetic pole portion 24 are flat surfaces extending in the radial direction. The circumferential angle of each first claw-shaped magnetic pole 22, that is, the angle between the circumferential end surfaces 22 a and 22 b is set smaller than the angle of the gap between the first claw-shaped magnetic poles 22 adjacent in the circumferential direction. Yes.

  Further, the radially outer surface 25 of the first magnetic pole portion 24 has a concentric circular arc surface in which the cross-sectional shape in the axis orthogonal direction is centered on the central axis O of the rotating shaft 6, and an auxiliary groove is formed in the radially outer surface 25. It has two grooves 26a and 26b. The auxiliary grooves 26a and 26b are formed at positions shifted by the same angle on both sides from the center in the circumferential direction of the radially outer surface 25, respectively. The auxiliary grooves 26a and 26b are formed in a U-shaped cross section in the direction perpendicular to the axis, and the bottom surface of the auxiliary grooves 26a and 26b is flat, and is formed at right angles to the side surfaces extending from the radially outer side from both sides.

  Further, as shown in FIG. 3C, the first magnetic pole portion 24 extends from the opposite surface 21 b of the first core base 21, which is the base end of the first magnetic pole portion 24, in the assembled state of the rotor 7. It is comprised longer than the axial direction length to 31 anti-opposing surface 31b. That is, the first magnetic pole portion 24 protrudes from the opposite surface 31b, which is the axial end position of the counterpart core base 31, by a length L1 in the axial direction.

  Further, when the counter-facing surface 31b of the core base 31 is used as a reference, the length of the first magnetic pole portion 24 from the reference is long although the length L2 is longer in the axial direction up to the axial end position of the teeth 12 of the stator 5. L1 is longer. Furthermore, when the counter-facing surface 31b of the core base 31 is used as a reference, the axial length of the windings 15 (14, 16) wound around the teeth 12 is longer by the length L3 than the first magnetic pole. The length L1 from the reference of the part 24 is shorter. In other words, the tip end portion of the first magnetic pole portion 24 is more axial than the counter-facing surface 31b of the mating core base 31 and the teeth 12 within a range in which the stator 5 (windings 14, 15, 16) does not protrude in the axial direction. The first magnetic pole portion 24 protrudes as long as possible until it protrudes to the position.

[Second rotor core 30]
The second rotor core 30 has the same material and the same shape as the first rotor core 20 and is disposed on the cylindrical front housing 2 side.

  The second rotor core 30 has a disk-shaped second core base 31, and a through hole 31 a is formed through the center of the second rotor core 30. A substantially cylindrical boss portion 31d is formed so as to protrude from the outer peripheral portion of the through hole 31a on the cylindrical front housing 2 side. The rotating shaft 6 is press-fitted into the through hole 31a (boss portion 31d), and the second core base 31 is fixed to the rotating shaft 6 by pressure. At that time, the boss portion 31d is separated in the axial direction from the bearing 8 accommodated and fixed in the bearing holding portion 2a (see FIG. 3A).

  In addition, four mounting holes 37 are formed in the second core base 31 so as to penetrate at an equiangular interval on a concentric circle with the central axis O as the center. The mounting hole 37 is a hole formed because the second rotor core 30 is the same component as the first rotor core 20.

  On the outer peripheral surface 31c of the second core base 31, four second claw-shaped magnetic poles 32 are formed at equal intervals so as to protrude radially outward and extend in the axial direction. Here, in the second claw-shaped magnetic pole 32, a portion that protrudes radially outward from the outer peripheral surface 31 c of the second core base 31 is referred to as a second base portion 33, and a tip portion bent in the axial direction is the second magnetic pole portion 34. That's it.

  Both end surfaces 32a and 32b in the circumferential direction of the second claw-shaped magnetic pole 32 composed of the second base portion 33 and the second magnetic pole portion 34 are flat surfaces extending in the radial direction. The circumferential angle of each of the second claw-shaped magnetic poles 32, that is, the angle between the circumferential end surfaces 32a and 32b is set smaller than the angle of the gap between the second claw-shaped magnetic poles 32 adjacent in the circumferential direction. Yes.

  Further, the radially outer surface 35 of the second magnetic pole portion 34 has a concentric circular arc surface in which the cross-sectional shape in the axis orthogonal direction is centered on the central axis O of the rotating shaft 6, and an auxiliary groove is formed in the radially outer surface 35. It has two grooves 36a and 36b. The auxiliary grooves 36a and 36b are formed at positions shifted from the center in the circumferential direction of the radially outer surface 35 on both sides by the same angle. The auxiliary grooves 36a and 36b have a U-shaped cross-section in the direction perpendicular to the axis, have a flat bottom surface, and are formed at right angles to the side surfaces extending from the outside in the radial direction from both sides.

  Further, as shown in FIG. 3B, the second magnetic pole portion 34 is opposite to the second core base 31, which is the base end of the second magnetic pole portion 34, in the assembled state of the rotor 7, similarly to the first rotor core 20. It is longer than the axial length from the surface 31 b to the opposite surface 21 b of the first core base 21. That is, also in the 2nd magnetic pole part 34, the front-end | tip part protrudes from the anti-facing surface 21b of the core base 21 of the other party long in the axial direction by length L1.

  Similarly, when the opposite surface 21b of the core base 21 is used as a reference, the length L1 of the second magnetic pole portion 34 from the reference is longer than the length L2 of the teeth 12 of the stator 5 from the reference. 12 is shorter than the length L3 from the reference to the axial end position of the winding 15 (14, 16). That is, the distal end portion of the second magnetic pole portion 34 is more axial than the counter-facing surface 21b of the mating core base 21 and the teeth 12 within a range that does not protrude in the axial direction from the stator 5 (windings 14, 15, 16). The second magnetic pole portion 34 protrudes as long as possible until it protrudes to the position.

  The second rotor core 30 is combined so as to face the first rotor core 20 so that the second claw-shaped magnetic poles 32 enter between the first claw-shaped magnetic poles 22 of the first rotor core 20. At this time, the field magnet 40 is interposed between the axial directions of the second core base 31 and the first core base 21.

[Field magnet 40]
As shown in FIG. 6, the field magnet 40 is a disk-shaped permanent magnet, and a through hole 40a is formed at the center thereof. The field magnet 40 has a cylindrical sleeve 41 inserted through the through hole 40a. The sleeve 41 is made of a non-magnetic material and is made of the same stainless steel as the rotary shaft 6 in this embodiment. The outer diameter of the field magnet 40 is set to coincide with the outer diameters of the first and second core bases 21 and 31. Therefore, the outer peripheral surface 40 b of the field magnet 40 is flush with the outer peripheral surfaces 21 c and 31 c of the first and second core bases 21 and 31.

  The field magnet 40 is magnetized in the axial direction, and is magnetized so that the first rotor core 20 side becomes an N pole (first magnetic pole) and the second rotor core 30 side becomes an S pole (second magnetic pole). Yes. Therefore, by this field magnet 40, the first claw-shaped magnetic pole 22 of the first rotor core 20 functions as an N pole (first magnetic pole), and the second claw-shaped magnetic pole 32 of the second rotor core 30 functions as an S pole (second magnetic pole). Function as a magnetic pole).

  Therefore, the rotor 7 of the present embodiment is a so-called Landel type rotor using the field magnet 40. In the rotor 7, first claw-shaped magnetic poles 22 that are N poles and second claw-shaped magnetic poles 32 that are S poles are alternately arranged in the circumferential direction, and the number of magnetic poles is eight. That is, in the brushless motor M of this embodiment, the number of poles of the rotor 7 is set to 2 × n (where n is a natural number), and the number of teeth 12 of the stator 5 is set to 3 × n. The number of poles of the rotor 7 is set to “8”, and the number of teeth 12 of the stator 5 is set to “12”.

[Rectifier magnet 42]
Further, the rotor 7 includes a rectifying magnet 42 positioned around the first and second claw-shaped magnetic poles 22 and 32 on the outer peripheral side of the field magnet 40. The field magnet 40 is formed in an annular shape having a central hole. The field magnet 40 and the rectifying magnet 42 are made of different materials. Specifically, the field magnet 40 is, for example, a sintered magnet, and is composed of a ferrite magnet, a samarium cobalt (SmCo) magnet, a neodymium magnet, or the like. The rectifier magnet 42 is, for example, a bond magnet (plastic magnet, rubber magnet, etc.), and is composed of a ferrite magnet, a samarium iron nitrogen (SmFeN) magnet, a samarium cobalt (SmCo) magnet, a neodymium magnet, or the like.

  As shown in FIG. 6, the rectifying magnet 42 has back magnet portions 43 and 44 and an interpole magnet portion 45 so as to suppress leakage magnetic flux in each of the back magnet portions 43 and 44 and the interpole magnet portion 45. It is a magnetized polar anisotropic magnet.

  Specifically, the one back magnet portion 43 is disposed between the inner peripheral surface of the first magnetic pole portion 24 of the first claw-shaped magnetic pole 22 and the outer peripheral surface 31c of the second core base 31, and the second core base It is comprised so that it may become flush with 31 anti-opposing surface 31b. The back magnet portion 43 has a side that contacts the inner peripheral surface of the first magnetic pole portion 24 as the N pole having the same polarity as the first magnetic pole portion 24 and a side that contacts the outer peripheral surface 31c of the second core base 31 as the second core. The radial component is mainly magnetized so as to be the S pole having the same polarity as the base 31.

  The other back magnet portion 44 is disposed between the inner peripheral surface of the second magnetic pole portion 34 of the second claw-shaped magnetic pole 32 and the outer peripheral surface 21 c of the first core base 21, and is opposite to the first core base 21. It is configured to be flush with the surface 21b. The back magnet portion 44 has a side that contacts the inner peripheral surface of the second magnetic pole portion 34 as the south pole of the same polarity as the second magnetic pole portion 34, and a side that contacts the outer peripheral surface 21 c of the first core base 21 as the first core. The radial component is mainly magnetized so as to be an N pole having the same polarity as the base 21.

  The interpolar magnet portion 45 is disposed between the first claw-shaped magnetic pole 22 and the second claw-shaped magnetic pole 32 in the circumferential direction. The interpolar magnet portion 45 has both end surfaces in the axial direction flush with the anti-opposing surface 21b of the first core base 21 and the anti-opposing surface 31b of the second core base 31 (with the corresponding back magnet portions 43 and 44). It is comprised so that. The interpolar magnet unit 45 is mainly magnetized in the circumferential direction so that the first claw-shaped magnetic pole 22 side becomes the N pole and the second claw-shaped magnetic pole 32 side becomes the S pole in the circumferential direction.

[Support plate 51 and sensor magnet 61]
As shown in FIG. 3A, a support plate 51 that holds the sensor magnet 61 is fixed to the end surface of the rotor 7 on the end frame 3 side (the opposite surface 21 b of the first core base 21). The support plate 51 is made of a nonmagnetic material (brass in this embodiment).

  The support plate 51 has an annular base portion 52, and the rotation shaft 6 passes through the center portion of the base portion 52, and is fitted into each mounting hole 27 formed in the opposite surface 21 b of the first core base 21. To wear. The base 52 abuts against the opposite surface 21 b of the first core base 21 and a part of the rectifying magnet 42 (the axial end surfaces of the back magnet 44 and the interpole magnet 45). A cylindrical wall 53 is erected on the outer peripheral edge of the base portion 52, and a ring-shaped sensor magnet 61 is fixed inside the cylindrical wall 53. The sensor magnet 61 rotates integrally with the rotor 7. In the sensor magnet 61, N and S poles are alternately magnetized at equal angular intervals in the circumferential direction, and correspond to the magnetic poles of the first and second claw-shaped magnetic poles 22 and 32 in the assembled state of the rotor 7. .

[Magnetic sensor 62]
A magnetic sensor 62 such as a Hall IC is supported on the inner side surface 3 b in the axial direction of the end frame 3 so as to be opposed to the sensor magnet 61 in the axial direction. The magnetic sensor 62 may be directly fixed to the end frame 3 or may be indirectly held with respect to the end frame 3 via a holding member (not shown). The magnetic sensor 62 detects each magnetic pole of the sensor magnet 61 that rotates integrally with the rotor 7 and outputs a detection signal to a control circuit (not shown). The control circuit calculates the rotation angle (rotation position) of the rotor 7 based on the detection signal from the magnetic sensor 62 and calculates the rotation speed (rotation speed). Then, the control circuit performs drive control of the brushless motor M using the rotation information acquired by calculation.

Next, the operation of this embodiment will be described.
When a rotating magnetic field is generated in the stator 5 based on the supply of three-phase driving current to the windings 14, 15, and 16 of the stator 5 in order to drive the load through the rotating shaft 6, the stator 5 is disposed inside the stator 5. The rotor 7 rotates based on the rotating magnetic field.

  At that time, the first and second magnetic pole portions 24 in the structural relationship between the rotor 7 and the stator 5, specifically, in the relationship between the first and second magnetic pole portions 24 and 34 of the rotor 7 and the teeth 12 of the stator 5. , 34 is configured to protrude longer in the axial direction than the tooth 12, the magnetic flux that spreads outward from the tip end portion of the tooth 12 in the axial direction can be made effective. That is, the magnetic path between the rotor 7 and the stator 5 is expanded and the amount of effective magnetic flux is increased, which contributes to higher output of the motor M. Moreover, the first and second magnetic pole portions 24 and 34 are longer than the windings 14, 15, and 16 wound around the teeth 12 in a range that does not protrude in the axial direction, that is, within the axial dimension of the stator 5. Therefore, the motor M is not enlarged. In other words, it contributes to improving the output efficiency of the motor M.

Next, characteristic effects of the present embodiment will be described.
(1) As for the 1st and 2nd magnetic pole parts 24 and 34 which are the axial direction extension parts of the claw-shaped magnetic poles 22 and 32, the front-end | tip parts are the axial ends of the core bases 31 and 21 of the rotor cores 30 and 20 of the other party. It is the structure which protrudes from a position (anti-opposing surfaces 31b and 21b). And the front-end | tip part of this magnetic pole part 24 and 34 protrudes longer than the axial direction end position of the teeth 12 in the axial direction inner side rather than the axial direction end position of the coil | winding 14, 15, 16 wound around the teeth 12. FIG. It is configured as follows. As a result, the magnetic flux that spreads outward from the tip end portion of the tooth 12 in the axial direction and can leak can be made effective by the magnetic pole portions 24 and 34 projected in the axial direction. That is, since the magnetic path between the rotor 7 and the stator 5 is expanded and the effective magnetic flux amount is increased, the output of the motor M can be increased. Further, the magnetic pole portions 24 and 34 projecting in the axial direction should be accommodated in the axial direction inside the axial end positions of the windings 14, 15 and 16 wound around the teeth 12, that is, within the axial dimension of the stator 5. Therefore, it is possible to prevent the motor M from being enlarged.

  (2) The axial end positions of the back magnet portions 43 and 44 of the rectifying magnet 42 provided radially inward of the magnetic pole portions 24 and 34 of the claw-shaped magnetic poles 22 and 32 are the axial end positions of the core bases 31 and 21 (anti-opposite). It is configured to be equivalent to the surfaces 31b and 21b), that is, to be inward in the axial direction from the axial end position of the tooth 12. As a result, the magnetic flux that spreads outward from the tip end portion of the tooth 12 in the axial direction can be caused to act inward in the axial direction, so that an increase in the effective magnetic flux amount and, in turn, high output of the motor M can be expected.

  (3) Since a space is formed on the radially inner side of the tip end portion of the second magnetic pole portion 34 protruding from the axial end position (the counter-facing surface 21b) of the core base 21, the sensor magnet 61 and the support plate 51 are provided in this space. By adopting a configuration in which a part is accommodated, it is possible to prevent the motor M from being enlarged.

In addition, you may change the said embodiment as follows.
Although the length L2 is set to be longer from the axial end positions (opposite surfaces 21b and 31b) of the core bases 21 and 31 to the axial end position of the teeth 12, as shown in FIGS. Further, the axial end positions of the core bases 21 and 31 may be equal to the axial end position of the teeth 12 (the length L2 is zero).

  -Although the front-end | tip part of the 1st and 2nd magnetic pole parts 24 and 34 was set to the inner side of the axial direction rather than the axial direction end position of the coil | winding 14,15,16 wound around the teeth 12, FIG. As shown in (c), the tip end portions of the first and second magnetic pole portions 24, 34 and the end positions in the axial direction of the windings 14, 15, 16 wound around the teeth 12 may be equivalent (length L1 and Same as length L3).

  -Although the annular rectifier magnet 42 provided integrally with the back magnet portions 43 and 44 and the interpole magnet portion 45 is used, the back magnet portion 43, the back magnet portion 44, and the interpole magnet portion 45 are separated from each other. May be. 7 to 9, the rectifying magnet 42 may be omitted. In this case, the gap X is a portion where the rectifying magnet 42 is omitted.

Although the motor M having the number of magnetic poles of the stator 5 of “12” and the number of magnetic poles of the rotor 7 of “8” is used, the present invention may be applied to a motor having a combination of other magnetic pole numbers.
-The material of the parts which comprise the motor M may be changed suitably.

-You may use the motor M for apparatuses other than a valve timing variable apparatus.
Next, a technical idea that can be grasped from the above embodiment and another example will be added below.
(A) In the Landell type motor according to claim 1 or 2,
A ring-shaped sensor magnet for obtaining rotation information is attached to the rotor via a support plate,
The sensor magnet and a part of the support plate that supports the sensor magnet are configured to be accommodated radially inward of the magnetic pole portion of the claw-shaped magnetic pole protruding from the axial end position of the core base of the rotor core. A featured Landel motor.

  In this way, since a space is formed on the radially inner side of the magnetic pole portion of the claw-shaped magnetic pole protruding from the axial end position of the core base of the rotor core, the sensor magnet and a part of the support plate are accommodated in this space. Thus, it is possible to prevent the motor from becoming large.

  M ... brushless motor (Landel motor), 5 ... stator, 7 ... rotor, 11 ... stator core, 12 ... teeth, 14, 15, 16 ... winding, 20, 30 ... first and second rotor cores, 21, 31 ... Core base, 21b, 31b ... anti-opposing surface (axial end position), 22, 32 ... claw-shaped magnetic pole, 24, 34 ... magnetic pole part, 40 ... field magnet, 43, 44 ... back magnet part (back magnet).

Claims (2)

The stator is provided with a stator in which a winding is wound on a tooth extending inward in the radial direction of the stator core via an insulator, and a rotor arranged to be rotatable inside the tip end portion of the tooth, the rotor A first and second rotor core in which a plurality of claw-shaped magnetic poles projecting radially outward from the outer peripheral portion of the core base and extending in the axial direction are formed at equal intervals in the circumferential direction; and a field magnet magnetized in the axial direction; The field magnets are arranged between the axial directions of the core bases of the first and second rotor cores, and the claw-shaped magnetic poles are alternately arranged in the circumferential direction by combining the claw-shaped magnetic poles so as to enter each other. A Landell motor with a rotor structure with different magnetic poles,
Axial in the direction of the sides, which also protrude from the axially extending portion of the pole portion and to the axial end position of the core based counterpart of the rotor core tip portion of the magnetic pole portions of the claw-shaped magnetic poles, and the partner The axial end position of the core base of the rotor core on the side is the inner side in the axial direction than the axial end position of the teeth,
On both sides in the axial direction, the tip of the magnetic pole portion of the claw-shaped magnetic pole is equal to or axially inward of the axial end position of the winding wound around the tooth, and from the axial end position of the tooth. Is configured to protrude long,
A Landell type motor characterized in that , on both sides in the axial direction, tip portions of the magnetic pole portions of the claw-shaped magnetic poles protruding longer than the axial end position of the teeth are opposed to the insulator in the radial direction. In the Landell type motor according to claim 1,
The rotor includes a back magnet on the radially inner side of the magnetic pole portion of the claw-shaped magnetic pole,
The Landel motor, wherein an axial end position of the back magnet is set inward in an axial direction with respect to the axial end position of the teeth.