JP2015080298A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently increase a magnetic flux amount in a rotary electric machine having a three-plane gap structure.SOLUTION: First and second field magnets 21 and 22 are arranged on both sides in the axial direction of an armature core 31, respectively, and a third field magnet 23 is arranged in the outside in the radial direction of the armature core 31. The armature core 31 includes: an annular base core 35; and first and second auxiliary teeth 36 and 37 which are fixed to the base core 35 so as to protrude from the base core 35 to the side of the first and second field magnets 21 and 22, respectively. Then, the respective auxiliary teeth 36 and 37 have first and second insertion parts 41 and 43, respectively, as a guide part for guiding a magnetic flux from the first and second field magnets 21 and 22 opposed to each other to the inside in the radial direction (anti-third filed magnet part side).

Description

  The present invention relates to a rotating electrical machine.

  Conventionally, for example, a rotating electrical machine (motor) disclosed in Patent Document 1 includes a stator in which a winding is wound around an annular armature core, and a rotor for the stator includes an inner peripheral surface, an outer peripheral surface, and an outer peripheral surface of the armature core. First to third magnets are provided to face the one end surface in the axial direction. Such a rotating electrical machine has a three-surface gap structure that secures magnetic fluxes on three of the four surfaces on both the axial and radial sides of the armature core, so that the size of the motor is minimized. However, the output can be improved.

JP 2010-35375 A

  In the rotating electrical machine having the above three-surface gap structure, the magnetic path on the side where the magnet is not arranged among the total four surfaces on both the axial direction side and the radial direction side of the armature core (in the configuration of Patent Document 1, the axial direction) The magnetic flux is less likely to flow in the magnetic path on the side opposite to the third magnet), and the magnetic flux tends to concentrate on the opposite magnetic path (the magnetic path on the third magnet side in the axial direction in the configuration of Patent Document 1). Therefore, even if the magnetic volume of the magnet is increased by increasing the volume of the magnet to increase the amount of magnetic flux, for example, magnetic saturation occurs in the magnetic path on the third magnet side of the armature core, and the amount of magnetic flux is efficiently increased. It was difficult to make.

  The present invention has been made to solve the above-described problems, and an object thereof is to efficiently increase the amount of magnetic flux in a rotating electrical machine having a three-surface gap structure.

  A rotating electrical machine that solves the above problems is a rotating electrical machine in which field magnet portions are respectively disposed in three of four sides on both the axial side and the radial side of an armature core on which a winding is wound, A pair of the field magnet portions disposed opposite to each other in the axial direction or the radial direction via the armature core are defined as a first field magnet portion and a second field magnet portion, respectively, and the remaining field magnet portions are defined as the first field magnet portion. The armature core includes an annular base core and auxiliary teeth fixed to the base core so as to protrude from the base core toward the first and second field magnet parts, respectively. The auxiliary teeth have a guide portion that guides the magnetic flux from the opposing first and second field magnet portions to the anti-third field magnet portion side.

  According to this configuration, the magnetic fluxes of the first and second field magnet portions are magnetized on the side where the field magnet portion in the armature core is not disposed (anti-third field magnet portion side) by the guide portion of the auxiliary teeth. Guided to the road. For this reason, it is possible to increase the amount of magnetic flux on the opposite side (side on which the magnet portion is not disposed) while suppressing magnetic saturation in the magnetic path on the third field magnet portion side of the armature core. The amount of magnetic flux can be increased efficiently.

  In the rotating electrical machine, the guide portion of the auxiliary teeth is an insertion portion that is inserted into a fixed recess that is recessed in the base core, and the insertion portion is connected to the first and second field magnet portions. It is preferable that the length in the facing direction is formed to be longer on the side opposite to the third field magnet portion than on the third field magnet portion side.

  According to this configuration, the magnetic flux from the first and second field magnet parts can be suitably guided to the anti-third field magnet part side, and the amount of magnetic flux on the anti-third field magnet part side of the armature core Can be suitably increased.

  In the rotating electrical machine, an inclined surface that inclines inward in the facing direction from the third field magnet portion side toward the anti-third field magnet portion side is formed on the distal end surface of the insertion portion in the facing direction. Preferably it is formed.

  According to this configuration, the length of the insertion portion can be configured to gradually increase as the distance from the third field magnet portion increases, and the magnetic flux from the first field magnet portion and the second field magnet portion can be reduced by the insertion portion. It can guide suitably to the magnet part side.

  In the rotating electrical machine, it is preferable that the length of the insertion portion is formed to increase stepwise from the third field magnet portion side toward the anti-third field magnet portion side.

  According to this configuration, the length of the insertion portion can be configured to increase stepwise as the distance from the third field magnet portion increases, and the insertion portion allows the magnetic flux from the first and second field magnet portions to be anti-third. It can guide suitably to the field magnet part side.

In the rotating electrical machine, it is preferable that the guide portion of the auxiliary tooth is a bent portion bent toward the anti-third field magnet portion side.
According to this configuration, the magnetic flux from the first and second field magnet portions can be suitably guided to the anti-third field magnet portion side by the bent portion of the auxiliary teeth, and the anti-third field magnet of the armature core can be obtained. It is possible to suitably increase the amount of magnetic flux on the magnet unit side.

  According to the rotating electrical machine of the present invention, the amount of magnetic flux can be efficiently increased in the rotating electrical machine having the three-surface gap structure.

It is sectional drawing of the motor of embodiment. It is a disassembled perspective view of the motor of the same form. It is a perspective view of the armature core of the same form. It is a disassembled perspective view which shows the armature core of the same form partially. It is sectional drawing of the armature core of the same form. It is sectional drawing of the armature core of another example. It is sectional drawing of the armature core of another example.

Hereinafter, an embodiment of a rotating electrical machine (motor) will be described.
As shown in FIG. 1, a motor 10 as a rotating electrical machine of the present embodiment is configured such that a rotor 13 is rotatably supported with respect to a yoke housing 12 (hereinafter referred to as a yoke 12) that constitutes a stator 11. .

[Structure of stator]
As shown in FIGS. 1 and 2, the yoke 12 includes a cylindrical member 14 and plate-like first and second disk members 15 and 16 provided on both sides in the axial direction of the cylindrical member 14. A holder member 17 is assembled to the outer end surface (end surface on the side opposite to the cylindrical member) of the second disk member 16.

  The cylindrical member 14 of the yoke 12 is formed by rounding a metal plate into an annular shape, and both end portions (first and second opening end portions 14 a and 14 b) are opened in the axial direction of the rotor 13. Has been placed. A plurality of fixed projections 14c projecting in the axial direction are formed on the open end portions 14a and 14b of the cylindrical member 14, respectively.

  The first disk member 15 is formed by pressing from a metal plate, and is fixed to the first opening end portion 14 a of the cylindrical member 14. Specifically, the fixing protrusions 14c formed at the first opening end portion 14a of the cylindrical member 14 are respectively inserted into the plurality of through holes 15a formed near the outer edge portion of the first disk member 15 and caulked. Alternatively, the first disk member 15 is fixed to the first opening end portion 14a by being bent. A bearing 18 a that supports the rotating shaft 18 of the rotor 13 is supported at the center of the first disk member 15.

  The second disk member 16 is formed by pressing from a metal plate, and is fixed to the second opening end portion 14 b of the cylindrical member 14. Specifically, the fixing protrusions 14c formed at the second opening end portion 14b of the cylindrical member 14 are respectively inserted into the plurality of through holes 16a formed near the outer edge portion of the second disk member 16 and caulked. Alternatively, the second disk member 16 is fixed to the second opening end portion 14b by being bent. In addition, an opening 16 c through which the rotor 13 is inserted is formed at the center of the second disk member 16. The first and second disk members 15 and 16 are connected to each other by a bolt 19 located on the outer peripheral side of the cylindrical member 14 in a state where the cylindrical member 14 is sandwiched in the axial direction.

  A plurality of first field magnets 21 (first field magnet portions) are fixed to the inner end surface 15b (the surface on the cylindrical member 14 side) of the first disk member 15 along the circumferential direction. In the present embodiment, eight first field magnets 21 are provided at equal circumferential intervals (intervals of 45 degrees), and have the same shape. Each of the first field magnets 21 has a flat shape with a small thickness in the axial direction and has a substantially fan shape when viewed in the axial direction. Each of the first field magnets 21 is magnetized in the axial direction, and the N poles appearing on the inner side surface in the axial direction and the S poles appearing on the inner side surface in the axial direction are alternately arranged in the circumferential direction. Yes.

  A plurality of second field magnets 22 (second field magnet portions) are fixed to the inner end surface 16b (surface on the cylindrical member 14 side) of the second disk member 16 along the circumferential direction. The same number of second field magnets 22 as the first field magnets 21 are provided at equal intervals in the circumferential direction (45 degree intervals), and have the same shape. Each second field magnet 22 is a flat shape with a small axial thickness, as in the first field magnet 21, and has a substantially fan shape when viewed in the axial direction. Each of the second field magnets 22 is magnetized in the axial direction, and the N poles appearing on the inner side surface in the axial direction and the S poles appearing on the inner side surface in the axial direction are alternately arranged in the circumferential direction. Yes.

  A plurality of third field magnets 23 (third field magnet portions) are fixed to the inner peripheral surface of the cylindrical member 14 along the circumferential direction. The third field magnets 23 are provided in the same number as the first field magnets 21 at equal intervals in the circumferential direction (45 degree intervals) and have the same shape. The third field magnet 23 has a circumferentially orthogonal cross section formed in a substantially rectangular shape, and the inner peripheral surface thereof is parallel to the axial direction of the rotary shaft 18. The third field magnets 23 are magnetized in the radial direction, and the N poles appearing on the inner circumference side and the S poles appearing on the inner circumference side are alternately arranged in the circumferential direction. .

  In addition, the 1st-3rd field magnets 21-23 are arrange | positioned so that those magnetic pole centers of the circumferential direction may mutually shift | deviate in the circumferential direction (refer FIG. 2). More specifically, with reference to the magnetic pole center of the third field magnet 23, the magnetic pole center of the first field magnet 21 is at one angle in the circumferential direction, and the magnetic pole center of the second field magnet 22 is at the same angle in the other circumferential direction. It is only shifted.

  The holder member 17 is fixed to the second disk member 16 with a plurality of screws (not shown). A bearing 18 b that pivotally supports the rotating shaft 18 is provided at the center of the bottom 17 a of the holder member 17. A plate-like base 24 that is perpendicular to the axial direction is fixed to the bottom 17 a of the holder member 17, and a plurality of (four in this embodiment) power supply brushes 26 are attached to the base 24. Is held. Each power supply brush 26 is provided so as to be slidable in the radial direction, and a distal end portion (radial inner end portion) is pressed into contact with an outer peripheral surface of a commutator 32 described later. Each power supply brush 26 is electrically connected to an external connection terminal 25.

[Configuration of rotor]
The rotor 13 includes a cylindrical rotary shaft 18 that is supported by the bearings 18a and 18b, an armature core 31 that is fixed to the rotary shaft 18, a commutator 32 that is fixed to the rotary shaft 18, and an armature core. And a winding 33 wound around 31.

  The armature core 31 is disposed in an accommodation space defined by the cylindrical member 14 and the first and second disk members 15 and 16, and is on the inner peripheral side of the third field magnet 23 and in the axial direction. It is located between the first field magnet 21 and the second field magnet 22.

  As shown in FIGS. 3 and 4, the armature core 31 includes a disc-shaped interposition member 34 fixed to the rotating shaft 18, an annular base core 35 fixed to the outer peripheral surface of the interposition member 34, and a base core The first and second auxiliary teeth 36 and 37 are provided on both sides of the 35 in the axial direction.

  The base core 35 is formed by laminating a plurality of base core sheets C1 (see FIG. 5) formed by stamping a steel plate by press working, and then caulking them together. In FIGS. 3 and 4, illustration of the laminated structure of the base core sheet C1 is omitted for simplification of the drawings.

  On the outer peripheral portion of the base core 35, 24 radial projecting portions 38 projecting radially outward are formed at equal circumferential intervals (15-degree intervals). Each radial protrusion 38 is formed in a radial shape centered on the rotation shaft 18 and has a rectangular shape when viewed from the outside in the radial direction. The outer peripheral surface of each radial protrusion 38 has an arcuate shape that is located on the same circle centered on the axis of the rotary shaft 18 when viewed from the axial direction.

  As shown in FIGS. 4 and 5, the base core 35 has a fixed recess 39 extending linearly along the radial direction from the inner peripheral surface thereof at a position corresponding to the radial protrusion 38 in the circumferential direction. Is formed. The radially inner end of the fixed recess 39 is open in the radial direction, and the radially outer end extends to the vicinity of the outer peripheral surface of the radially projecting portion 38. In addition, the fixed recessed part 39 is formed in the circumferential direction center of each radial direction protrusion part 38, and is formed in the circumferential direction equal space | interval (15 degree space | interval). Further, the fixed recess 39 is formed over the entire axial direction of the base core 35. That is, the fixed recess 39 is opened not only in the radial direction but also on both sides in the axial direction. The fixed recess 39 is formed in parallel to the axial direction.

  A pair of auxiliary teeth (first and second auxiliary teeth 36, 37) is press-fitted and fixed in each fixed recess 39. The first and second auxiliary teeth 36 and 37 are provided in the same number (24) as the fixed recesses 39 and the radial protrusions 38 at equal intervals in the circumferential direction, and the first auxiliary teeth 36 are arranged in the axial direction of the base core 35. The second auxiliary teeth 37 are respectively provided on the other side in the axial direction of the base core 35 (the commutator 32 side described later). The first auxiliary teeth 36 and the second auxiliary teeth 37 have a line-symmetric shape with respect to a line orthogonal to the axial direction of the base core 35.

  The first auxiliary teeth 36 have a first insertion portion 41 inserted into the fixed recess 39 and a first axial protrusion 42 integrally formed with the first insertion portion 41 and protruding in the axial direction from the fixed recess 39. doing. The first axial projecting portion 42 is configured to project perpendicular to the axial end surface of the base core 35 that forms a flat surface perpendicular to the axial direction. Moreover, the axial front end surface (the upper end surface in FIGS. 4 and 5) of the first axial protrusion 42 forms a flat surface perpendicular to the axial direction.

  As shown in FIG. 4, the first axial projecting portion 42 has a wide portion 42 a at a portion outside the substantially center in the radial direction and a narrow portion 42 b at the inside portion. The circumferential width of the wide portion 42a is wider than the circumferential width of the narrow portion 42b.

  The first insertion portion 41 is formed linearly along the radial direction. The circumferential width of the first insertion portion 41 is uniformly formed over the entire radial direction, and is narrower than the circumferential width of the first axial protruding portion 42 (the narrow portion 42b).

  As shown in FIGS. 4 and 5, the axial length of the first insertion portion 41 (from the axial lower end surface of the first axial protrusion 42 to the axial distal end surface (lower end surface) of the first insertion portion 41. Is formed so as to become longer toward the inner side in the radial direction. That is, the front end surface in the axial direction of the first insertion portion 41 is an inclined surface 41 a that is inclined so as to be separated from the first axial protrusion 42 in the axial direction toward the radially inner side. The inclined surface 41a is a flat surface.

  The second auxiliary teeth 37 have the same configuration as the first auxiliary teeth 36, and correspond to the first insertion portion 41 and the first axial protrusion 42 (the wide portion 42a and the narrow portion 42b), respectively. It has the part 43 and the 2nd axial direction protrusion part 44 (the wide part 44a and the narrow part 44b).

  The axial length of the second insertion portion 43 (the length from the axial upper end surface of the second axial projection 44 to the axial distal end surface (upper end surface) of the second insertion portion 43) is directed radially inward. It is formed to be as long as possible. That is, the tip end surface in the axial direction of the second insertion portion 43 is an inclined surface 43 a that is inclined so as to be separated from the second axial protrusion 44 in the axial direction toward the radially inner side.

  In a state where the auxiliary teeth 36 and 37 are assembled in the fixed recess 39, the inclined surface 41a of the first insertion portion 41 and the inclined surface 43a of the second insertion portion 43 are closer to each other in the axial direction toward the radially inner side. It is configured. Further, an intermediate portion 39a formed in the fixed recess 39 is interposed between the inclined surfaces 41a and 43a in the axial direction. The intermediate portion 39a is formed so as to be connected to both end surfaces in the circumferential direction and the radially outer end portion of the fixed recess 39. Further, the intermediate portion 39a has a substantially triangular cross section whose axial length is shorter toward the inner peripheral side, and both axial end surfaces of the intermediate portion 39a are inclined surfaces 41a, 41a of the first and second insertion portions 41, 43, respectively. It is formed in an inclined shape that abuts on 43a.

  As shown in FIG. 5, the first and second auxiliary teeth 36, 37 are formed by laminating and integrating a plurality of auxiliary core sheets C2 formed by stamping a steel plate by pressing. . The stacking direction of the auxiliary core sheet C2 coincides with the radial direction of the base core 35, and is orthogonal to the stacking direction of the base core sheet C1. 3 and 4, illustration of the laminated structure of the auxiliary core sheet C2 is omitted for simplification of the drawings.

  The radial protrusions 38, the first axial protrusions 42, and the second axial protrusions 44 are provided in the same number (24 in the present embodiment), and are provided at equal intervals in the circumferential direction. Moreover, each radial direction protrusion part 38 and each axial direction protrusion part 42 and 44 are arrange | positioned in the same position in the circumferential direction.

  Further, in the base core 35, one radial protrusion 38 and the first and second axial protrusions 42 and 44 on both sides in the axial direction constitute one tooth T. That is, the base core 35 is configured with 24 tooth portions T at equal intervals in the circumferential direction. Further, between the circumferential directions of the teeth T, that is, between the circumferential directions of the radial projections 38, between the circumferential directions of the first axial projections 42, and between the circumferential directions of the second axial projections 44. Constitutes a space (slot) for winding the winding 33, and the winding 33 is wound around the slot in a predetermined manner.

  Each tooth portion T is on the inner peripheral side of the third field magnet 23 and is positioned between the first field magnet 21 and the second field magnet 22 in the axial direction. The tip end surface in the axial direction of the first axially projecting portion 42 of the tooth portion T faces the facing surface (the axially inner side surface) of the first field magnet 21 in the axial direction with a gap. The axial front end surface of the first axial protrusion 42 and the opposing surface of the first field magnet 21 are parallel to each other and form a plane perpendicular to the axial direction. Further, the axial front end surface of the second axial protrusion 44 is opposed to the opposing surface (axial inner side surface) of the second field magnet 22 in the axial direction via a gap. The axial front end surface of the second axial protrusion 44 and the opposing surface of the second field magnet 22 are parallel to each other and form a plane perpendicular to the axial direction. Further, the outer peripheral surface of the tooth portion T (the outer peripheral surface of the first and second axial projecting portions 42 and 44 and the outer peripheral surface of the radial projecting portion 38) has a gap with respect to the inner peripheral surface of the third field magnet 23. Via the radial direction.

  As shown in FIG. 1, the commutator 32 is fixed between the armature core 31 on the rotating shaft 18 and the bearing 18 b supported by the holder member 17. The diameter of the opening 16 c of the second disk member 16 is formed larger than the outer diameter of the commutator 32 so as not to interfere with the commutator 32. The commutator 32 includes a cylindrical insulating member 45 fitted on the rotary shaft 18 and a plurality of segments 46 arranged in parallel on the outer peripheral surface of the insulating member 45 in the circumferential direction. The number of segments 46 is 24, which is the same as the number of teeth T, and is arranged on the outer peripheral surface of the insulating member 45 at equal intervals in the circumferential direction (15-degree intervals). A winding 33 wound around the armature core 31 is connected to the segment 46.

Next, the operation of this embodiment will be described.
A magnetic field generated in the armature core 31 by being fed from the power source to the winding 33 through the power feeding brush 26 and the segment 46 acts radially outward from the outer peripheral surface of the tooth portion T, and each axial protruding portion. It acts in the axial direction from the axial end faces of 42 and 44. And the magnetic field of the armature core 31 is mutually opposite to the magnetic field of the 1st-3rd field magnets 21-23 which respectively face the axial direction end surface of each axial protrusion part 42,44 and the outer peripheral surface of the teeth part T. Acts, whereby the rotor 13 rotates. Thus, since the magnetic flux contributing to the generation of torque is secured on the three axial end surfaces and the outer peripheral surface of the armature core 31, it is possible to improve the output while suppressing an increase in the size of the motor 10. It has become.

  Here, as shown in FIG. 5, when the flow of magnetic flux flowing through the first and second auxiliary teeth 36 and 37 (see the broken arrows in FIG. 5) is seen, the insertion portions are inserted from the axial protrusions 42 and 44. The magnetic flux that flows along the axial direction on the 41 and 43 side is guided to the inner peripheral side along the inclined surfaces 41 a and 43 a of the insertion portions 41 and 43. That is, the magnetic fluxes of the first and second field magnets 21 and 22 facing the first and second axial protrusions 42 and 44, respectively, are caused by the inclined surfaces 41a and 43a of the first and second insertion portions 41 and 43, respectively. It is guided to the magnetic path on the inner peripheral side where no field magnet is arranged. This makes it possible to increase the amount of magnetic flux passing through the inner peripheral side portion of the armature core 31 while suppressing magnetic saturation at the outer peripheral side portion of the armature core 31 facing the third field magnet 23. As a result, the amount of magnetic flux passing through the armature core 31 is efficiently increased.

Next, characteristic effects of the present embodiment will be described.
(1) The first and second auxiliary teeth 36 and 37 serve as guide portions that guide the magnetic fluxes from the opposing first and second field magnets 21 and 22 to the radially inner side (anti-third field magnet side). It has the 1st and 2nd insertion parts 41 and 43, respectively. According to this configuration, the magnetic fluxes of the first and second field magnets 21 and 22 are guided by the insertion portions 41 and 43 to the magnetic path on the inner peripheral side where the field magnets in the armature core 31 are not disposed. For this reason, it is possible to increase the amount of magnetic flux on the inner peripheral side where the field magnet is not disposed, while suppressing magnetic saturation in the magnetic path on the third field magnet 23 side (outer peripheral side) of the armature core 31. As a result, the amount of magnetic flux can be increased efficiently.

  (2) The insertion portions 41 and 43 as the guide portions of the auxiliary teeth 36 and 37 have a length (axial length) in the direction facing the first and second field magnets 21 and 22 on the outer peripheral side ( It is formed to be longer on the inner peripheral side (anti-third field magnet side) than on the third field magnet side 23). According to this structure, the magnetic flux from the 1st and 2nd field magnets 21 and 22 can be suitably guide | induced to the inner peripheral side, and the amount of magnetic flux in the inner peripheral side of the armature core 31 can be increased suitably. It becomes possible.

  (3) The axially leading end surfaces of the insertion portions 41 and 43 are axially inner (approaching each other) from the outer peripheral side (third field magnet 23 side) toward the inner peripheral side (anti-third field magnet side). Inclined surfaces 41a and 43a inclined in the direction) are formed. According to this configuration, the axial lengths of the insertion portions 41 and 43 can be configured to gradually increase from the third field magnet 23 toward the radially inner side, and the first and second field magnets 21, The magnetic flux from 22 can be suitably guided to the inner peripheral side by the insertion portions 41 and 43.

In addition, you may change the said embodiment as follows.
-In above-mentioned embodiment, although inclined surface 41a, 43a was formed in the insertion part 41, 43 of each auxiliary teeth 36, 37, it is not specifically limited to this. For example, as shown in FIG. 6, step portions 51 and 52 are formed instead of the inclined surfaces 41 a and 43 a, and the axial lengths of the insertion portions 41 and 43 are from the outer peripheral side (the third field magnet 23 side). You may comprise so that it may become long in steps as it goes to the inner peripheral side (anti-third field magnet side). Also with such a configuration, the magnetic flux from the first and second field magnets 21 and 22 can be suitably guided to the inner peripheral side by the insertion portions 41 and 43. Note that both end surfaces in the axial direction of the intermediate portion 39a formed in the fixed recess 39 are formed in steps that are in close contact with the step portions 51 and 52, respectively.

  In the above embodiment, the axial lengths of the insertion portions 41 and 43 are increased on the inner peripheral side (the anti-third field magnet side), whereby the magnetic flux from the first and second field magnets 21 and 22 is increased. Although it is configured to lead to the inner peripheral side, it is not particularly limited thereto.

  For example, each of the auxiliary teeth 36 and 37 shown in FIG. 7 includes a first block 53 composed of a plurality of laminated first core sheets C3 having an L-shaped section, and a plurality of laminated second core sheets C4 having an I-shaped section. And the second block 54. The first core sheet C3 constituting the first block 53 constitutes the outer peripheral side of the axial projecting portions 42, 44, and the inner peripheral side (anti-third field magnet side) at the bent portion 55 in the fixed recess 39. Is bent. The second block 54 is provided on the bent inner side of the first core sheet C <b> 3 and constitutes the inner peripheral side of the axial projecting portions 42 and 44. The second core sheet C4 constituting the second block 54 is laminated along the radial direction of the base core 35. Further, the first core sheets C3 of the first and second auxiliary teeth 36, 37 are in contact with each other in the axial direction.

  According to this configuration, the magnetic flux that flows along the axial direction to the outer peripheral side portions (first block 53 portions) of the axial projecting portions 42 and 44 is the inner peripheral side along the bent portion 55 of the first core sheet C3. Led to. That is, the magnetic fluxes of the first and second field magnets 21 and 22 facing the axial protrusions 42 and 44, respectively, are guided by the bent portion 55 to a magnetic path on the inner peripheral side where the field magnet is not disposed. This makes it possible to increase the amount of magnetic flux passing through the inner peripheral side portion of the armature core 31 while suppressing magnetic saturation at the outer peripheral side portion of the armature core 31 facing the third field magnet 23. As a result, the amount of magnetic flux passing through the armature core 31 is efficiently increased.

  In addition, in this example (example shown in FIG. 7), the first core sheets C3 of the first and second auxiliary teeth 36 and 37 are in contact with each other in the axial direction, but may be separated from each other in the axial direction. Alternatively, the first and second auxiliary teeth 36 and 37 may be integrally formed by fixing the first core sheets C3 of the first and second auxiliary teeth 36 and 37 together. Moreover, in this example, although the 1st and 2nd blocks 53 and 54 were comprised by the 1st and 2nd core sheets C3 and C4, respectively, you may shape | mold integrally with a dust core. Further, in this example, the auxiliary teeth 36 and 37 are partially inserted into the fixed recess 39. However, for example, the auxiliary teeth 36 and 37 are fixed to the axial end surface of the base core 35. It is good.

  -In above-mentioned embodiment, although 1st and 2nd auxiliary teeth 36 and 37 were comprised by the separate body, respectively, for example, the 1st and 2nd auxiliary teeth 36 and 37 were integrally connected by the inner peripheral side. It is good also as a structure as components.

  In the above embodiment, the fixed recess 39 is formed at a position corresponding to the radial protrusion 38 in the circumferential direction. However, for example, it is formed at a position corresponding to the slot between the radial protrusions 38, for example. May be.

  In the above-described embodiment, the radial protrusions 38 and the axial protrusions 42 and 44 are provided at the same position in the circumferential direction. Also good.

The base core 35 and the auxiliary teeth 36 and 37 may be integrally formed with a dust core or the like.
In the above embodiment, the yoke 12 constituting the stator 11 is composed of the cylindrical member 14 and the first and second disk members 15 and 16 made of different members, but other than this, for example, the first and second One of the disk members 15 and 16 may be formed integrally with the cylindrical member 14.

  -In the said embodiment, the 1st-3rd field magnets 21-23 are each provided with two or more along the circumferential direction. That is, the first to third field magnets 21 to 23 are separated in the circumferential direction for each magnetic pole, but other than this, for example, an annular magnet magnetized so that a plurality of poles are generated in the circumferential direction May be used. According to this configuration, the number of magnets can be reduced, which is advantageous in terms of component management.

  In the above-described embodiment, the first to third field magnets 21 to 23 are separated from each other. For example, the first to third field magnets 21 to 23 that are substantially in the same position in the circumferential direction are also included. May be formed as an integral part having a U-shaped cross section that is integrally connected to each other.

-The number (number of poles) of each field magnet 21-23 is not limited to the said embodiment, You may change suitably according to a structure.
In the above-described embodiment, the motor 10 is embodied. However, for example, the motor 10 may be embodied in a rotating electric machine such as a DC generator.

  DESCRIPTION OF SYMBOLS 10 ... Motor (rotary electric machine), 11 ... Stator, 13 ... Rotor, 18 ... Rotating shaft, 21 ... 1st field magnet (1st field magnet part), 22 ... 2nd field magnet (2nd field magnet) Part), 23 ... third field magnet (third field magnet part), 31 ... armature core, 33 ... winding, 35 ... base core, 36 ... first auxiliary teeth, 37 ... second auxiliary teeth, 38 ... Radial protrusion, 39 ... Fixed recess, 41 ... First insertion part (guide part), 41a ... Inclined surface, 42 ... First axial protrusion part, 43 ... Second insertion part (guide part), 43a ... Inclination 44, second axial projecting portion, 51, 52, stepped portion, 55, bent portion (guide portion), T, teeth portion.

Claims (5)

A rotating electrical machine in which field magnet portions are respectively arranged in three of four sides on both the axial side and the radial side of an armature core wound with a winding,
A pair of the field magnet portions disposed opposite to each other in the axial direction or the radial direction via the armature core are defined as a first field magnet portion and a second field magnet portion, respectively, and the remaining field magnet portions are defined as the first field magnet portion. 3 field magnet part,
The armature core includes an annular base core, and auxiliary teeth fixed to the base core so as to protrude from the base core to the first and second field magnet parts, respectively.
The rotating electrical machine is characterized in that the auxiliary teeth have a guide portion that guides magnetic fluxes from the first and second field magnet portions facing each other to the side opposite to the third field magnet portion. In the rotating electrical machine according to claim 1,
The guide portion of the auxiliary teeth is an insertion portion inserted into a fixed recess provided in the base core, and the insertion portion has a length in a direction opposite to the first and second field magnet portions. Is formed so as to be longer on the anti-third field magnet portion side than on the third field magnet portion side. The rotating electrical machine according to claim 2,
An inclined surface that is inclined inward in the facing direction from the third field magnet portion side to the anti-third field magnet portion side is formed on the distal end surface of the insertion portion in the facing direction. Rotating electric machine. The rotating electrical machine according to claim 2,
The rotary electric machine is characterized in that the length of the insertion portion is formed so as to increase stepwise from the third field magnet portion side toward the anti-third field magnet portion side. In the rotating electrical machine according to any one of claims 1 to 4,
The rotating electrical machine, wherein the guide portion of the auxiliary tooth is a bent portion bent toward the anti-third field magnet portion.