JP2012090446A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine that increases torque.SOLUTION: A stator 40 has an annular portion 42 that is formed into an annular shape, and a plurality of salient poles 43 that extend radially inward from the annular portion 42. A rotor 31 is provided radially inside the salient poles 43 of the stator 40 so as to be rotatable relative to the stator 40. Bobbins 50 each attached to the salient poles 43 are formed of a magnetic material and extend to respective radially inner ends of the salient poles 43. Windings 56 each wound on the bobbins 50 produce magnetic fields when energized. Since the bobbins 50 formed of the magnetic material extend to the respective radially inner ends of the salient poles 43, magnetic paths formed by the bobbins 50 and the salient poles 43 have large cross-sectional areas. Thus, magnetic fluxes flowing from the stator 40 and the bobbins 50 to the rotor 31 are strengthened.

Description

  The present invention relates to a rotating electrical machine.

Conventionally, a shift-by-wire system is known in which a shift range selected by a driver is detected by an electronic control unit (ECU) and a shift range and a parking mechanism of an automatic transmission are switched according to the detected value. A rotary actuator is used for the drive unit of the shift-by-wire system.
The rotary actuator described in Patent Document 1 includes an SR motor (switched reluctance motor) and a speed reducer that decelerates and outputs the rotation of the SR motor. In the SR motor, a winding is wound around a bobbin attached to a salient pole of a stator. Thus, after winding the winding around the bobbin, the bobbin can be attached to the salient pole of the stator. For this reason, since it is possible to automate the processing of the winding, the manufacturing cost can be reduced as compared with the SR motor in which the winding is wound directly around the conventional stator.

JP 2009-141992 A

However, in the SR motor of Patent Document 1, the space for winding the winding in the slot of the stator is reduced by the thickness of the bobbin. For this reason, there is a concern that the torque of the SR motor is reduced when the number of windings is reduced.
On the other hand, if an attempt is made to secure a space in the slot of Patent Document 1 that is equivalent to the space in the motor slot in which the winding is wound directly around the stator in the prior art, the salient pole is made thinner by the thickness of the bobbin. It is conceivable to form. However, since the bobbin of Patent Document 1 is made of resin, if the salient pole is made thin, the cross-sectional area of the magnetic path through which the magnetic flux flows in the salient pole may be reduced, and the torque of the SR motor may be reduced.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotating electrical machine capable of increasing torque.

According to the rotating electrical machine of the first aspect of the present invention, the stator has an annular portion formed in an annular shape and a plurality of salient poles extending radially inward from the annular portion. On the radially inner side of the stator salient poles, the rotor is provided to be rotatable relative to the stator. The bobbin provided on the salient pole is made of a magnetic material and extends to the radially inner end of the salient pole. The winding wound around the bobbin generates a magnetic field when energized. Magnetic flux generated by energizing the windings flows through the stator, bobbin, and rotor.
The bobbin formed from the magnetic material extends to the radially inner end of the salient pole, so that the cross-sectional area of the magnetic path formed from the bobbin and the salient pole increases. For this reason, the magnetic flux which flows from a stator and a bobbin to a rotor becomes strong. Therefore, the torque of the rotating electrical machine can be increased.
Further, if the salient pole is formed thinly by the thickness of the bobbin and a bobbin corresponding to the salient pole is attached, the space for winding the winding in the slot can be increased by the thickness of the bobbin. In this case, the magnetic path cross-sectional area composed of the bobbin and the salient pole formed from the magnetic body of the present invention is substantially the same as the magnetic path cross-sectional area composed only of the salient pole of the motor using the bobbin formed from the conventional insulator. It becomes size. Therefore, the number of turns of the winding can be increased and the torque of the rotating electrical machine can be increased without reducing the magnetic path cross-sectional area.

  According to the second aspect of the present invention, the bobbin has a cylindrical cylindrical portion extending from the radially outer end of the salient pole to the radially inner end, and from the rotor side of the cylindrical portion to the radially outward direction of the cylindrical portion. It has the 1st collar part extended and the 2nd collar part extended in the radial direction of a cylinder part from the annular part side of a cylinder part. Since the cylindrical cylindrical portion extends from the radially outer end of the salient pole to the radially inner end, the magnetic path inside the winding is formed by the salient pole and the cylindrical portion. The cross-sectional area of the magnetic path through which the current flows can be increased.

  According to the invention which concerns on Claim 3, a 1st collar part is located in the rotation direction of the edge part inside the radial direction of a salient pole. Thereby, the area where the magnetic path formed by the 1st collar part and salient pole of a bobbin and a rotor face becomes large. Moreover, the distance between the 1st collar part adjacent to a rotation direction and a 1st collar part becomes small. For this reason, since a magnetic flux flows rapidly between a stator and a rotor through a 1st collar part, while increasing the torque of a rotary electric machine, a cogging torque can be reduced.

  According to the invention which concerns on Claim 4, the 1st collar part is formed with the substantially same curvature radius as the wall surface by the side of the rotor of a salient pole on the rotor side. As a result, the magnetic gap between the first flange and the rotor has a constant size, so that the torque of the rotating electrical machine can be increased and the cogging torque can be reduced.

  According to the invention which concerns on Claim 5, a bobbin has a recessed part dented from the rotor side to the cyclic | annular part side in the edge part of the rotation direction of a 1st collar part. This prevents the bobbin from interfering with the first hook part of another bobbin adjacent to the end of the first hook part in the rotation direction. For this reason, it becomes possible to form a 1st collar large in a rotation direction. Accordingly, the number of windings wound around the bobbin can be increased, and the torque of the rotating electrical machine can be increased.

  According to the invention which concerns on Claim 6, the bobbin is formed by joining the cylinder part, the 1st collar part, and the 2nd collar part which were formed separately. Thereby, the bobbin which consists of a magnetic body can be formed easily. Therefore, the manufacturing cost can be reduced.

  According to the invention which concerns on Claim 7, a 1st collar part and a 2nd collar part are joined to the outer wall of the diameter outside of a cylinder part, and a bobbin is formed. Thereby, the magnetic flux which flows from a stator to a rotor can be strengthened, without dividing the magnetic path of the bobbin extended in parallel with a salient pole.

It is principal part sectional drawing of SR motor by 1st Embodiment of this invention. It is a block diagram of the shift-by-wire system used for the rotary actuator provided with SR motor by 1st Embodiment of this invention. It is sectional drawing of the rotary actuator provided with SR motor by 1st Embodiment of this invention. FIG. 4 is a plan view of a stator, bobbin, and windings of the SR motor viewed from the IV direction in FIG. 3. FIG. 5 is a cross-sectional view of the SR motor taken along line VV in FIG. 3. It is explanatory drawing of SR motor by 1st Embodiment of this invention. It is principal part sectional drawing of SR motor by 2nd Embodiment of this invention. It is principal part sectional drawing of SR motor by 3rd Embodiment of this invention.

Hereinafter, a plurality of embodiments according to the present invention will be described with reference to the drawings.
(First embodiment)
The rotating electrical machine according to the first embodiment of the present invention is an SR motor (switched reluctance motor) incorporated in a rotary actuator used in a shift-by-wire system that switches a shift range and a parking mechanism of an automatic transmission by electronic control.
First, the shift-by-wire system will be described with reference to FIG. The rotary actuator 1 rotates according to a drive signal input from the ECU 2. The rotational motion of the rotary actuator 1 is transmitted to the driving force transmission unit 3.
The driving force transmission unit 3 includes a control rod 6, a detent plate 7, a stopper 8, and the like. The control rod 6 is connected to the output shaft of the rotary actuator 1 and is rotated by the rotary actuator 1. The detent plate 7 is formed in a substantially fan shape and rotates together with the control rod 6.

The detent plate 7 is provided with a plurality of recesses 10 on the radially outer side. The plurality of recesses 10 respectively correspond to shift ranges such as P range, R range, N range, and D range of the automatic transmission. When the stopper 8 supported at the tip of the leaf spring 11 is fitted to any one of the recesses 10 of the detent plate 7, the rotation of the detent plate 7 is limited, and the position of the manual spool valve 5 in the axial direction is determined. When a rotational force is applied to the detent plate 7 from the rotary actuator 1 through the control rod 6, the stopper 8 moves to another adjacent recess 10.
The detent plate 7 is provided with a pin 9 that protrudes in parallel with the control rod 6. The pin 9 is locked to a manual spool valve 5 protruding from the hydraulic valve body 4. For this reason, when the detent plate 7 rotates, the manual spool valve 5 reciprocates in the axial direction. As the manual spool valve 5 moves, the oil passage in the hydraulic valve body 4 is switched, so that the hydraulic pressure is supplied to a predetermined engagement element of the automatic transmission, and the shift range is switched.

  The detent plate 7 is provided with a park rod 12. When the park pole 14 is pushed up by the conical portion 13 provided at the tip of the park rod 12, the convex portion 15 of the park pole 14 meshes with the concave portion 17 of the parking gear 16. Thereby, rotation of parking gear 16 is controlled. The parking gear 16 is interlocked with the drive shaft of the vehicle. Therefore, by restricting the rotation of the parking gear 16, the drive wheels of the vehicle are locked.

Next, the rotary actuator 1 will be described.
FIG. 3 is a sectional view of the rotary actuator 1. FIG. 4 is a plan view of the stator, coil, and bobbin of the SR motor viewed from the IV direction of FIG. FIG. 5 is a cross-sectional view of the SR motor taken along line VV in FIG.
The rotary actuator 1 includes a housing 20, an SR motor 30, a speed reducer 60, and the like. The housing 20 includes a rear housing 21 and a front housing 22. The SR motor 30 and the speed reducer 60 are accommodated in the housing 20.

The SR motor 30 is a brushless motor that does not use a permanent magnet. The SR motor 30 includes a rotor 31 and a stator 40.
The rotor 31 includes a rotor shaft 32 and a rotor core 33. One end of the rotor shaft 32 is rotatably supported by a front rolling bearing 34, and the other end is rotatably supported by a rear rolling bearing 35.
The front rolling bearing 34 has a radially inner side press-fitted into the front end of the rotor shaft 32 and a radially outer side fitted to the radially inner side of the cylindrical output shaft 64. The output shaft 64 is rotatably supported on the front housing 22 via a metal bearing 37 on the outer diameter side. Thereby, the front end of the rotor shaft 32 is rotatably supported with respect to the front housing 22 via the front rolling bearing 34, the output shaft 64 and the metal bearing 37.
The rear rolling bearing 35 is fixed to the rear housing 21 by being press-fitted into the rear end of the rotor shaft 32 on the inner diameter side and press-fitted on a plate 23 molded on the rear housing 21 on the outer diameter side.

  The rotor core 33 is configured by laminating a plurality of thin plates made of a magnetic material such as iron. The rotor core 33 is press-fitted and fixed to the rotor shaft 32. The rotor core 33 has a plurality of outward salient poles 38 extending in the radially outward direction (see FIG. 5). The outward salient poles 38 are provided in every 45 degrees in the rotation direction of the rotor 31.

The stator 40 is formed in a substantially annular shape, and is provided on the radially outer side of the outward salient pole 38 of the rotor core 33. The stator 40 is press-fitted into a plate 23 molded in the rear housing 21 and fixed to the rear housing 21.
The stator 40 is configured by laminating a plurality of thin plates made of a magnetic material such as iron. Each thin plate is formed with a punching portion 41 which is pushed out in one axial direction by a press. The upper thin plate launching portion 41 and the lower thin plate launching portion 41 are fitted to each other, thereby positioning the thin plates in the rotational direction.
The stator 40 includes an annular portion 42 formed in an annular shape and a plurality of salient poles 43 extending radially inward from the annular portion 42. The stator 40 has a plurality of slots 44 between the salient poles 43.
Twelve poles 43 are provided every 30 degrees in the rotation direction of the rotor 31. A bobbin 50 is fitted on the outside of the salient pole 43.

The bobbin 50 that is a feature of the present embodiment will be described.
The bobbin 50 is made of a magnetic material such as iron. As shown in FIG. 1, the bobbin 50 includes a cylindrical tube portion 51, a first flange portion 52 provided at one end portion of the tube portion 51, and a second portion provided at the other end portion of the tube portion 51. It has a flange 53 and is formed integrally.
The cylindrical portion 51 is formed in a cylindrical shape having a rectangular cross section, and extends from the radially inner end of the salient pole 43 to the radially inner end. The plate portion 51 is formed to have substantially the same plate thickness from the radially inner end of the salient pole 43 to the radially inner end.
Here, the salient pole 43 is formed in an arc shape in which the wall surface 431 on the rotor 31 side is slightly larger than the outer diameter of the outward salient pole 38 of the rotor 31. The wall surface 511 on the rotor 31 side of the cylindrical portion 51 and the wall surface 431 on the rotor 31 side of the salient pole 43 are located on the same arc.
The first flange 52 extends from the rotor side of the tube portion 51 in the radially outward direction of the tube portion 51. The second flange portion 53 extends from the annular portion 42 side of the tubular portion 51 in the radially outward direction of the tubular portion 51 and is in contact with the annular portion 42 of the stator 40.

  In the bobbin manufacturing method, for example, the cylindrical portion 51, the first flange portion 52, and the second flange portion 53 are separately formed by press working or the like. Thereafter, as shown in FIG. 6, the bobbin 50 is integrally formed by joining the first flange portion 52 and the second flange portion 53 to the outer wall outside the diameter of the cylindrical portion 51 by press-fitting or welding.

As shown in FIGS. 1 and 4, each bobbin 50 is provided with two terminals 54 and 55, respectively. The terminals 54 and 55 are insulated from the bobbin 50. Terminals 54 and 55 are connected to the bus bar 24. The bus bar 24 is electrically connected to a connector 25 provided on the rear housing 21 through the wiring 18.
A winding 56 made of a copper wire with insulation coating is wound around the outside of the bobbin 50. The winding 56 is concentratedly wound for each bobbin 50. Both ends of the winding 56 are connected to two terminals 54 and 55 provided on the bobbin 50, respectively. Note that insulating paper or the like may be provided between the bobbin 50 and the winding 56 as necessary.

  An encoder 26 is provided between the rotor 31 and the rear housing 21. The encoder 26 includes a magnet 28 that rotates with the rotor 31 and a Hall IC 29 that detects the magnetic flux of the magnet 28. The Hall IC 29 is provided on a substrate fixed inside the rear housing 21. A detection signal of the Hall IC 29 is output to the ECU 2. The ECU 2 detects the rotation speed, the rotation speed, the rotation angle, and the like of the rotor 31 based on the signal input from the Hall IC 29 and, based on the detected value, passes the connector 25, the wiring 18 and the bus bar 24 from the drive circuit to the winding 56. Supply power.

Next, the speed reducer 60 will be described.
The reduction gear 60 is a kind of planetary gear device, and includes an eccentric portion 61, a sun gear 62, a ring gear 63, an output shaft 64, and the like.
An eccentric portion 61 is provided on the rotor shaft 32 corresponding to the input shaft of the speed reducer 60. The center of the eccentric portion 61 is eccentric with respect to the rotation center of the rotor shaft 32.
The sun gear 62 is formed in a substantially disk shape and has external teeth 65 on the outer periphery. The sun gear 62 is supported on the outside of the eccentric portion 61 via a bearing 70 so as to be rotatable with respect to the eccentric portion 61. For this reason, the sun gear 62 rotates eccentrically with respect to the rotor shaft 32.

The ring gear 63 is formed in an annular shape and has inner teeth 66 on the inner periphery. The ring gear 63 is fixed to a plate 27 molded on the front housing 22.
The sun gear 62 is pressed against the ring gear 63 by the rotation of the eccentric portion 61, and rotates with the outer teeth 65 and the inner teeth 66 of the ring gear 63 meshing with each other.

The output shaft 64 has a flange 67 at the end on the sun gear 62 side. A plurality of pin holes 68 are formed in the flange 67 on the same circumference. The sun gear 62 is provided with a plurality of pins 69 that protrude toward the flange 67 and are loosely fitted into the pin holes 68 of the flange 67.
When the rotor shaft 32 rotates, the sun gear 62 rotates at a reduced speed with respect to the rotor shaft 32. Due to the fit between the pin 69 and the pin hole 68, the rotation of the sun gear 62 is transmitted to the output shaft 64. The output shaft 64 is connected to the control rod 6 of the shift-by-wire system described above.

The operation of the SR motor will be described with reference to FIG.
The bobbins 50 attached to the salient poles 43A to 43L shown in FIG. 5 are referred to as bobbins 50A to 50L, respectively. Further, the windings 56 wound around the bobbins 50A to 50L are referred to as windings 56A to L, respectively.
The windings 56A, D, G, and J are U phases, the windings 56C, F, I, and L are V phases, and the windings 56B, E, H, and K are W phases.

In the state shown in FIG. 5, when the U-phase windings 56A, D, G, and J are energized, the magnetic flux generated in the winding 56A is generated from the salient pole 43A and the bobbin 50A to the outward salient pole of the rotor 31. It flows to 38M. From the outward salient pole 38M, the outward salient pole 38O, the salient pole 43D and the bobbin 50D, the annular portion 42, the salient pole 43A and the bobbin 50A flow in this order. Further, the outward salient pole 38M, the salient pole 43J and the bobbin 50J, the annular portion 42, the salient pole 43A and the bobbin 50A flow in this order.
On the other hand, the magnetic flux generated in the winding 56G flows from the salient pole 43G and the bobbin 50G to the outward salient pole 38Q. From the outward salient pole 38Q, the outward salient pole 38O, the salient pole 43D and the bobbin 50D, the annular portion 42, the salient pole 43G and the bobbin 50G flow in this order. Further, the outward salient pole 38Q, the outward salient pole 38S, the salient pole 43J and the bobbin 50J, the annular portion 42, the salient pole 43G and the bobbin 50G flow in this order.
As a result, the outward salient poles 38M, O, Q, and S of the rotor 31 are attracted to the salient poles 43A, D, G, and J of the stator 40 and rotate counterclockwise.

When the V-phase windings 56C, F, I, and L are energized after the rotor 31 has rotated a predetermined amount counterclockwise from the state shown in FIG. 5, the magnetic flux generated in the winding 56C is changed to a salient pole. It flows from 43C and the bobbin 50C to the outward salient pole 38N of the rotor 31. From the outward salient pole 38N, the outward salient pole 38P, the salient pole 43F and the bobbin 50F, the annular portion 42, the salient pole 43C and the bobbin 50C flow in this order. Further, the outward salient pole 38N flows in the order of the outward salient pole 38T, the salient pole 43L and the bobbin 50L, the annular portion 42, the salient pole 43C and the bobbin 50C.
On the other hand, the magnetic flux generated in the winding 56I flows from the salient pole 43I and the bobbin 50I to the outward salient pole 38R. From the outward salient pole 38R, the outward salient pole 38P, the salient pole 43F and the bobbin 50F, the annular portion 42, the salient pole 43I and the bobbin 50I flow in this order. Further, from the outward salient pole 38R, the outward salient pole 38T, the salient pole 43L and the bobbin 50L, the annular portion 42, the salient pole 43I and the bobbin 50I flow in this order.
Thus, the outward salient poles 38N, P, R, and T of the rotor 31 are attracted to the salient poles 43C, F, I, and L of the stator 40 and rotate counterclockwise.

  As described above, when the energization to the winding 56 is switched in the order of the U phase, the V phase, and the W phase from the state illustrated in FIG. 5, the rotor 31 rotates in the counterclockwise direction. In contrast, when the energization is switched to the winding 56 in the order of the W phase, the V phase, and the U phase from the state of FIG. 5, the rotor 31 rotates in the clockwise direction. Thus, by switching the energization to each winding 56, the rotor 31 can be rotated in an arbitrary direction.

In the present embodiment, the following effects are obtained.
(1) In the present embodiment, the bobbin 50 is formed of a magnetic material, and the cylindrical part 51 of the bobbin 50 extends from the radially outer end of the salient pole 43 to the radially inner end. If the cylindrical portion 51 does not extend to the radially inner end of the salient pole 43, the salient pole 43 protruding from the bobbin becomes a magnetic aperture. On the other hand, in the present embodiment, the cylindrical portion 51 of the bobbin 50 together with the salient pole 43 becomes a magnetic path through which the magnetic flux flows, so that the magnetic path cross-sectional area through which the magnetic flux generated by energization of the winding 56 flows is increased. For this reason, the magnetic flux which flows from the salient pole 43 of the stator 40 to the outward salient pole 38 of the rotor is strengthened. Therefore, the torque of the SR motor 30 can be increased.
(2) In the present embodiment, if the salient poles 43 are formed as thin as the thickness of the bobbin 50, the space for winding the winding 56 in the slot 44 can be increased. For example, even if the salient poles 43 are formed thinly by the thickness of the bobbin 50, the magnetic path cross-sectional area formed by the bobbin 50 and the salient poles 43 is equal to that of a stator salient pole using a bobbin formed from a conventional insulator. It becomes possible to make it the same size as the magnetic path cross-sectional area. Therefore, the number of turns of the winding 56 can be increased and the torque of the SR motor 30 can be increased without reducing the magnetic path cross-sectional area.
(3) In this embodiment, the bobbin 50 is formed by joining the cylindrical part 51, the 1st collar part 52, and the 2nd collar part 53 which were formed by the separate body mutually by press injection, welding, etc. Thereby, the bobbin 50 can be easily formed of a magnetic material such as iron. Therefore, the manufacturing cost can be reduced.

(Second Embodiment)
FIG. 7 shows a cross-sectional view of a main part of an SR motor according to the second embodiment of the present invention. Hereinafter, in a plurality of embodiments, the same numerals are given to the composition substantially the same as a 1st embodiment mentioned above, and explanation is omitted. In the present embodiment, the first flange portion 57 of the bobbin 50 is located at the radially inner end of the salient pole 43. The first flange 57 is formed such that the radius of curvature of the wall surface 571 on the rotor 31 side is substantially the same as the radius of curvature of the wall surface 431 of the salient pole 43 on the rotor 31 side. Therefore, the wall surface 571 of the first flange portion 57 on the rotor 31 side is located on the same arc as the wall surface 431 of the salient pole 43 on the rotor 31 side.
Further, the bobbin 50 has concave portions 58 that are recessed from the rotor 31 side to the annular portion 42 side at both ends of the first flange portion 57 in the rotational direction. The recess 58 extends in the axial direction of the stator 40 (in the direction perpendicular to the plane of FIG. 7). For this reason, the bobbin 50 is prevented from interfering with the rotational end of the first flange 57 of another bobbin 50 adjacent to the rotational direction of the end of the first flange 57 in the rotational direction.

This embodiment has the following effects.
(1) In the present embodiment, the area where the magnetic path formed by the first flange 57 and the salient pole 43 of the bobbin 50 and the outward salient pole 38 of the rotor 31 face each other is increased. Moreover, the distance between the 1st collar part 57 and the 1st collar part 57 adjacent to a rotation direction becomes small. Thereby, the outward salient pole 38 of the rotor 31 attracted by the predetermined salient pole 43 of the stator 40 and the first flange 57 attached to the predetermined salient pole 43 are in the radial direction of the stator 40 and the rotor 31. The overlapping area increases. For this reason, since the change of the magnetic flux which flows between the 1st collar part 57 and the outward salient pole 38 reduces, a cogging torque can be reduced.
(2) In the present embodiment, the magnetic gap between the first flange 57 and the outward salient pole 38 is formed to have a constant size, so that the torque of the SR motor 30 is increased and the cogging torque is reduced. can do.
(3) In this embodiment, by providing the recess 58 in the first flange 57, interference between the first flange 57 and the first flange 57 adjacent to each other in the rotational direction is prevented, so the first flange 57 can be formed large in the rotational direction. Therefore, the number of windings 56 wound around the bobbin 50 can be increased and the torque of the SR motor 30 can be increased.

(Third embodiment)
FIG. 8 shows a cross-sectional view of a main part of an SR motor according to a third embodiment of the present invention. In the present embodiment, the bobbin 50 does not have a recess at the end of the first flange 59 in the rotational direction. Instead, the salient poles 45 of the stator 40 are provided in order to prevent interference between the rotational end of the first flange 59 and the rotational end of the first flange 59 of another adjacent bobbin 50. 1. It is thinner than the second embodiment.

In the present embodiment, it is possible to increase the space for winding the winding 56 between the first flange portion 59 and the second flange portion 53 of the bobbin 50. On the other hand, when the salient pole 45 is formed as thin as the plate thickness of the cylindrical portion 51 of the bobbin 50, the magnetic path cross-sectional area formed by the cylindrical portion 51 of the bobbin 50 and the salient pole 45 is formed from a conventional insulator. It is maintained at the same size as the magnetic path cross-sectional area of the salient pole of the stator using the bobbin. Therefore, the torque of the SR motor 30 can be increased by increasing the number of turns of the winding 56 without reducing the magnetic path cross-sectional area.
Also in the present embodiment, the outward salient pole 38 of the rotor 31 attracted to the predetermined salient pole 45 of the stator 40 and the first flange 59 attached to the predetermined salient pole 45 are the rotor 31 and The overlapping area in the radial direction of the stator 40 increases. For this reason, the change of the magnetic flux which flows between the 1st collar part 59 and the outward salient pole 38 of the rotor 31 is reduced, and cogging torque can be reduced.

(Other embodiments)
In the above-described embodiment, the salient poles 43 and 45 of the stator 40 are 12 poles, the outward salient pole 38 of the rotor 31 is 8 poles, and a three-phase excitation switched reluctance motor has been described. On the other hand, the present invention is not limited to the number of poles of the stator and the rotor and the number of excitation phases.
Further, the present invention may be applied to a brushless motor including a rotor in which different kinds of magnetic poles are magnetized in the rotation direction.
In the above-described embodiment, the inner rotation type motor has been described. On the other hand, the present invention may be applied to an abduction motor.
In the above-described embodiment, the SR motor that is an example of the electric motor has been described as the rotating electric machine. On the other hand, the present invention may be applied to a generator.
The present invention is not limited to the above embodiment, and can be implemented in various forms without departing from the spirit of the invention.

30 ... SR motor (rotary electric machine)
31 ... Rotor 40 ... Stator 42 ... Annular parts 43 and 45 ... Salient pole 44 ... Slot 50 ... Bobbin 56 ... Winding 51 ... Cylindrical parts 52, 57, 59 ... 1st collar part 53 ... 2nd collar part

Claims (7)

An annular portion formed in an annular shape, and a stator having a plurality of salient poles extending radially inward from the annular portion;
A rotor provided on the radially inner side of the salient pole of the stator so as to be rotatable relative to the stator;
A bobbin provided on the outside of the salient pole, formed from a magnetic material, and extending to the radially inner end of the salient pole;
A rotating electrical machine comprising: a winding wound around the bobbin and generating a magnetic field when energized.   The bobbin has a cylindrical tube portion extending from a radially outer end portion of the salient pole to a radially inner end portion, and a first flange portion extending from the rotor side of the tubular portion in the radially outward direction of the tubular portion. The rotating electrical machine according to claim 1, further comprising a second flange portion extending in a radially outward direction of the cylindrical portion from the annular portion side of the cylindrical portion.   3. The rotating electrical machine according to claim 2, wherein the first flange portion is positioned in a rotation direction of a radially inner end portion of the salient pole.   4. The rotating electrical machine according to claim 3, wherein the first flange portion is formed such that a wall surface on the rotor side has substantially the same radius of curvature as a wall surface on the rotor side of the salient pole.   5. The rotating electrical machine according to claim 3, wherein the bobbin has a recessed portion that is recessed from the rotor side toward the annular portion side at an end portion in a rotation direction of the first flange portion.   6. The bobbin according to claim 2, wherein the bobbin portion, the first flange portion, and the second flange portion formed separately are joined to each other. The rotating electrical machine described.   The rotating electrical machine according to claim 6, wherein the bobbin is formed by joining the first flange portion and the second flange portion to an outer wall on the outer side of the cylindrical portion.

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