JP2015039280A - Rotating electrical machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating electrical machine that implements an improved output while suppressing an increase in size.SOLUTION: A motor 10 includes: a rotor 13 in which an armature core 31 and a commutator 32 are integrally rotatably mounted on a rotary shaft 18 and windings 33 wound on a plurality of tooth portions T juxtaposed circumferentially of the armature core 31 are electrically connected to the commutator 32; feeding brushes 26 pressed into contact with the commutator 32 to be placed in electrical communication with the commutator 32; and a stator 11 in which first field magnets 21 radially opposite to an outer circumferential surface of the armature core 31, second field magnets 22 opposite to one axial end face of the armature core 31, and third field magnets 23 opposite to the other axial end face of the armature core 31 are disposed in a housing 12.

Description

  The present invention relates to a rotating electrical machine such as a brushed DC motor.

  Conventionally, for example, as disclosed in Patent Document 1, a rotor of a brushed DC motor includes an armature core and a commutator that rotate integrally with a rotating shaft, and is wound around a plurality of teeth of the armature core. Is connected to the commutator. A field magnet is assembled to the inner peripheral surface of the housing surrounding the outer periphery of the armature core, and the field magnet is configured to face the outer peripheral surface of the armature core in the radial direction. Further, the brush supported by the housing is pressed against the commutator, and current is supplied from the brush to the winding via the commutator, and the magnetic field generated in the winding and the magnetic field of the field magnet are The rotor is rotated by this interaction.

JP 2007-43831 A

  By the way, in the rotary electric machine with the brush as described above, in order to improve the motor output, the axial length and diameter of the armature core are increased to increase the facing area between the outer peripheral surface of the armature core and the field magnet. However, there is a problem that the size of the motor increases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to improve the output of a rotating electrical machine with a brush while suppressing an increase in size.

  In the rotating electrical machine that solves the above problems, an armature core and a commutator are provided on a rotating shaft so as to be integrally rotatable, and windings wound around a plurality of tooth portions arranged in parallel in the circumferential direction of the armature core are provided. A rotor that is electrically connected to the commutator, a brush that is pressed into contact with the commutator and is electrically connected to the commutator, and an outer peripheral surface of the armature core that is radially opposed to the commutator. A housing includes a first field magnet portion, a second field magnet portion facing the one end surface in the axial direction of the armature core, and a third field magnet portion facing the other end surface in the axial direction of the armature core. And a provided stator.

  According to this configuration, the magnetic flux can be secured on the outer peripheral surface of the armature core and the axially opposite end surfaces facing the first to third field magnets. The output can be improved while suppressing the above.

  In the rotating electrical machine, the magnetic pole centers of one or two field magnet portions of the first to third field magnet portions and the magnetic pole centers of the other field magnet portions are shifted in the circumferential direction. It is preferable that

  According to this configuration, the magnetic pole centers of one or two of the first to third field magnet parts and the magnetic pole centers of the other field magnet parts are shifted in the circumferential direction. Therefore, it can contribute to suppression of cogging torque.

In the above rotating electrical machine, it is preferable that the magnetic pole centers of the first to third field magnet portions are shifted in the circumferential direction.
According to this configuration, all the magnetic pole centers of the first to third field magnet portions are displaced in the circumferential direction, which can contribute to further suppression of cogging torque.

  In the rotating electrical machine, with the magnetic pole center of the first field magnet portion as a reference, the magnetic pole center of the second field magnet portion is in one circumferential direction, and the magnetic pole center of the third field magnet portion is in the other circumferential direction. Are shifted by the same shift angle θ, and the shift angle θ is equal to (180 / M), where M is the least common multiple of the number of magnetic poles of each field magnet portion and the number of teeth portions, which are the same number as each other. ) × 0.5 ≦ θ ≦ (180 / M) × 0.67 is preferably set.

  According to this configuration, the shift angle θ is (180 / M) × 0.5 ≦ θ ≦ (180 / M) × 0..., Where M is the least common multiple of the number of magnetic poles of each field magnet portion and the number of teeth portions. By setting within the range of 67, the cogging torque can be suitably suppressed (see FIG. 7).

  In the rotating electrical machine, the plurality of tooth portions include a radially protruding portion that protrudes radially outward, and a first axially protruding portion that protrudes axially on one side and faces the second field magnet portion in the axial direction. And a second axial projecting portion that projects to the other axial side and faces the third field magnet portion in the axial direction, and the first projecting portion is disposed between the first projecting portion and the second projecting portion. It is preferable that the winding is wound between the circumferential directions of the axial protruding portions and between the circumferential directions of the second axial protruding portions.

  According to this configuration, the winding is suitably wound around the tooth portion while the radial protrusion portion of the tooth portion and the first and second axial protrusion portions are opposed to the first to third field magnet portions, respectively. Can contribute to the improvement of output.

  In the rotating electrical machine, the radially protruding portion has a radially opposing surface that is radially opposed to the first field magnet portion, and the first axially protruding portion is the second field magnet portion. A first axially facing surface facing the axial direction; the second axially projecting portion having a second axially facing surface facing the third field magnet portion in the axial direction; and the radial direction. The circumferential center position of one or two opposing surfaces among the opposing surface, the first axial facing surface, and the second axial facing surface and the circumferential central position of the other opposing surfaces are circumferential. It is preferable that they are arranged in a shifted manner.

  According to this configuration, the circumferential center position of one or two opposing surfaces among the radial facing surface, the first axial facing surface, and the second axial facing surface, and the circumferential direction of the other facing surfaces Since the center position is shifted in the circumferential direction, it can contribute to suppression of cogging torque.

  In the rotating electrical machine, it is preferable that the circumferential center positions of the radial facing surface, the first axial facing surface, and the second axial facing surface are shifted in the circumferential direction.

  According to this configuration, the circumferential center positions of the radial facing surface, the first axial facing surface, and the second axial facing surface are shifted in the circumferential direction, which contributes to further suppression of cogging torque. it can.

  In the rotating electrical machine, the first to third field magnet portions are configured to be separated from each other, and the housing includes a cylindrical member having the first field magnet portion fixed to an inner peripheral surface, A first plate-like member assembled to one end of the cylindrical member in the axial direction and the second field magnet portion fixed thereto, and a third plate magnet member assembled to the other axial end of the cylindrical member and the third field magnet portion fixed. Preferably, the second plate-shaped member is used.

  According to this configuration, after fixing the first to third field magnet portions to the tubular member, the first plate member, and the second plate member, respectively, the first and second plate members are used as the tubular member. By assembling, the housing can be configured, and the housing can be easily formed. Further, when the respective magnetic pole centers of the first to third field magnet portions are shifted in the circumferential direction, the shift angle θ can be easily adjusted.

  According to the rotating electrical machine of the present invention, it is possible to improve the output while suppressing an increase in size.

It is sectional drawing of the motor of embodiment. It is a disassembled perspective view of the motor of the same form. (A)-(c) is a top view for demonstrating the deviation | shift angle of a magnet. It is a perspective view of the armature core of the same form. It is the top view which looked at the armature core of the same form from the commutator side. It is a connection diagram for demonstrating the winding aspect of the coil | winding of the same form. It is a graph which shows the relationship between magnet shift angle (theta) and cogging torque. It is a graph which shows the relationship between ratio D / L of the outer diameter D of an armature core, and the axial direction length L, and an output. It is a perspective view which shows the armature core of another example. It is a disassembled perspective view which shows the motor of another example. It is sectional drawing which shows the motor of another example. It is a disassembled perspective view which shows the motor of another example. It is a model side view of the armature core of another example. It is a model side view of the armature core of another example. It is sectional drawing which shows a part of armature core of another example. It is a model side view 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 housing 12 that constitutes a stator 11.

[Structure of stator]
As shown in FIGS. 1 and 2, the housing 12 includes a cylindrical member 14 (tubular member) and plate-like first and second disk members 15 and 16 (first members) provided on both axial sides of the cylindrical member 14. 1 and the 2nd plate-shaped member), and the holder member 17 assembled | attached to the outer side end surface (end surface on the anti-cylindrical member side) of the 2nd disk member 16.

  The cylindrical member 14 is disposed so that both end portions (first and second opening end portions 14 a and 14 b) open in the axial direction of the rotor 13. A plurality of first field magnets 21 (first field magnet portions) are fixed to the inner peripheral surface of the cylindrical member 14 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. In addition, each first field magnet 21 is magnetized in the radial direction, and those in which the N pole appears on the inner circumferential side and those in which the S pole appears on the inner circumferential side are alternately arranged in the circumferential direction. . A plurality of fixed protrusions 14c (positioning protrusions 14c) protruding 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 fixed to the first opening end portion 14 a in the axial direction of the cylindrical member 14 with its plate surface being perpendicular to the axis of the rotation shaft 18 of the rotor 13. 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.

  A plurality of second field magnets 22 (second field magnet portions) are fixed to the inner end surface 15b (surface on the cylindrical member 14 side) of the first disk member 15 along the circumferential direction. The same number of the second field magnets 22 as the first field magnets 21 are provided at equal intervals in the circumferential direction (45 degree intervals). The second field magnets 22 have the same shape as each other, have a flat shape with a small axial thickness, and have 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.

  The second disk member 16 is fixed to the second opening end portion 14 b in the axial direction of the cylindrical member 14 with its plate surface perpendicular to the axis of the rotation shaft 18. That is, the first and second disk members 15 and 16 are configured in parallel to each other. 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 are caulked or bent. Thus, the second disk member 16 is fixed to the second opening end portion 14b. 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 third field magnets 23 (third 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 third field magnets 23 as the first field magnets 21 are provided at equal circumferential intervals (45 degree intervals). The third field magnets 23 have the same shape as each other and are formed in the same shape as the second field magnet 22. Each of the third field magnets 23 is magnetized in the axial direction, and those in which the N pole appears on the inner side surface in the axial direction and those in which the S pole appears on the inner side surface in the axial direction are alternately arranged in the circumferential direction. Yes.

  As shown in FIGS. 3A, 3B, and 3C, the first to third field magnets 21 to 23 are arranged such that their circumferential magnetic pole centers C1 to C3 are shifted from each other in the circumferential direction. Yes. More specifically, the magnetic pole center C2 of the second field magnet 22 is located on one side in the circumferential direction (counterclockwise in FIG. 3) with respect to the magnetic pole center C1 of the first field magnet 21. The magnetic pole center C3 is shifted in the other circumferential direction (clockwise in FIG. 3) by the same shift angle θ.

  As shown in FIGS. 1 and 2, 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.

  The four power supply brushes 26 include two positive brushes 26a and 26b that are electrically connected to the positive power supply terminal, and two negative brushes 26c and 26d that are electrically connected to the negative power supply terminal. It consists of. The base 24 is provided with a first terminal 25a connected to the positive pole power terminal and a second terminal 25b connected to the negative pole power terminal, and the first terminal 25a and each plus brush. 26a and 26b are electrically connected to the second terminal 25b and the minus side brushes 26c and 26d, respectively. Each of the brushes 26a to 26d is provided so as to be slidable in the radial direction, and a distal end portion (radial inner end portion) is pressed and contacted with an outer peripheral surface of a commutator 32 described later.

[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 first field magnet 21 and in the axial direction. It is located between the second field magnet 22 and the third field magnet 23.

  As shown in FIGS. 4 and 5, the armature core 31 includes a disc-shaped interposition member 34 fixed to the rotary shaft 18, an annular core main body 35 fixed to the outer peripheral surface of the interposition member 34, and a core It consists of 24 core pieces 36 that are press-fitted and fixed so as to penetrate the main body portion 35 in the axial direction.

  On the outer peripheral portion of the core main body 35, 24 radial protruding portions 41 protruding outward in the radial direction are formed at equal intervals in the circumferential direction (15 degree intervals). Each radial protrusion 41 is formed radially around 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 41 has an arc shape that is located on the same circle centered on the axis of the rotary shaft 18 when viewed from the axial direction.

  The core body 35 is formed with 24 fixing holes 42 that pass through the core body 35 in the axial direction at equal intervals in the circumferential direction (15-degree intervals). Each fixing hole 42 is formed at a position corresponding to the radial protrusion 41 and has a long shape extending in the radial direction extending from the vicinity of the inner peripheral edge of the core body 35 to the vicinity of the outer peripheral surface of the radial protrusion 41. A slit 41 a that communicates with the fixing hole 42 is formed in the axial direction at the circumferential center of the outer peripheral surface of the radial protrusion 41.

  A core piece 36 is press-fitted and fixed in each fixing hole 42. Both ends of the core piece 36 in the axial direction protrude from the fixing hole 42 in the axial direction, and the protruding portions on both sides in the axial direction constitute first and second axial protruding portions 43 and 44, respectively. In the present embodiment, a commutator 32 side described later is a second axial projecting portion 44, and the opposite side is a first axial projecting portion 43. The first and second axial projecting portions 43 and 44 are configured to project perpendicularly to the axial end surface of the core body portion 35 that forms a flat surface perpendicular to the axial direction. Moreover, the axial direction front end surface of each axial direction protrusion part 43 and 44 has comprised the flat surface perpendicular | vertical with respect to the axial direction. It should be noted that the outer portion of each core piece 36 from the substantially central portion in the radial direction has a shape having a wider circumferential width than the inner portion.

  As described above, the radial protrusions 41, the first axial protrusions 43, and the second axial protrusions 44 included in the core main body 35 are provided in the same number (24 in the present embodiment), and each has a circumferential direction. It is provided at equal intervals. Moreover, each radial direction protrusion part 41 and each axial direction protrusion part 43,44 are arrange | positioned in the same position in the circumferential direction.

  Further, in the core main body portion 35, one radial projecting portion 41 and first and second axial projecting portions 43 and 44 on both sides in the axial direction constitute one tooth portion T. That is, the core body 35 is configured with 24 teeth 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 protrusions 41, between the circumferential directions of the first axial protrusions 43, and between the circumferential directions of the second axial protrusions 44. Constitutes a space (slot) for winding the winding 33.

  Each tooth portion T is on the inner peripheral side of the first field magnet 21 and is positioned between the second field magnet 22 and the third field magnet 23 in the axial direction (see FIG. 1). . That is, the outer peripheral surface of the radial protrusion 41 is opposed to the first field magnet 21 in the radial direction. Further, the front end surface in the axial direction of the first axial protrusion 43 opposes the second field magnet 22 in the axial direction. The axial front end surface of the second axial protrusion 44 faces the third field magnet 23 in the axial direction.

  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.

  As shown in FIG. 5, the commutator 32 includes a cylindrical insulating member 45 fitted on the rotary shaft 18 and a plurality of segments 46 arranged in parallel in the circumferential direction on the outer peripheral surface of the insulating member 45. Has been. 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). Moreover, each segment 46 is arrange | positioned so that it may correspond with the position of the circumferential direction of each teeth part T. FIG. In addition, a hook-shaped connection portion 46 a for connecting the end portion of the winding 33 is formed at one end portion (end portion on the armature core 31 side) of each segment 46 in the axial direction.

In each segment 46, four segments 46 every 90 degrees are electrically connected to each other through a conduction line (not shown).
Specifically, when numbers “1” to “24” are sequentially given to the respective segments 46 in the circumferential direction (counterclockwise), the first, seventh, thirteenth, and nineteenth segments 46 are electrically connected to each other. These four segments 46 constitute a first system segment group.

In addition, the second, eighth, fourteenth and twentyth segments 46 are electrically connected to each other, and these four segments 46 constitute a segment group of the second system.
The third, ninth, fifteenth and twenty-first segments 46 are electrically connected to each other, and these four segments 46 constitute a third system segment group.

The fourth, tenth, sixteenth, and twenty-second segments 46 are electrically connected to each other, and the four segments 46 constitute a fourth group of segments.
In addition, the fifth, eleventh, seventeenth, and twenty-third segments 46 are electrically connected to each other, and the four segments 46 constitute a fifth group of segments.

The sixth, twelfth, eighteenth and twenty-fourth segments 46 are electrically connected to each other, and these four segments 46 constitute a sixth group of segments.
Next, the winding mode of the winding 33 will be described with reference to FIGS.

  In FIG. 6, for convenience of explanation, only the first to third windings 33 a to 33 c connected to the first to third segments 46 are illustrated. 5 and 6, numbers “1” to “24” are sequentially given to the teeth portions T in the circumferential direction (counterclockwise), and the segments 46 and the teeth portions T at the same position in the circumferential direction are connected. Same number.

  The first winding 33a whose start end is connected to the first segment 46 is drawn counterclockwise (in the direction in which the number increases) from the first segment 46 and between the tenth and eleventh tooth portions T. Is inserted. Specifically, the first winding 33 a is sequentially formed between the second axial protrusions 44, the radial protrusions 41, and the first axial protrusions 43 of the tenth and eleventh tooth portions T. From there, it passes through the inner peripheral side of the first axially projecting portion 43 counterclockwise and is inserted between the 13th and 14th tooth portions T. At this time, the first winding wire 33a is in order between the first axial projection 43, the radial projection 41, and the second axial projection 44 of the 13th and 14th tooth portions T. From there, it passes between the 10th and 11th tooth portions T through the inner peripheral side of the second axially projecting portion 44 in the clockwise direction.

  By repeating such routing a predetermined number of times, the first winding 33a is wound around the 11th to 13th tooth portions T. The end of the first winding 33a is drawn counterclockwise from the inner peripheral side of the second axial projection 44 between the second axial projection 44 of the 13th and 14th teeth T. , Connected to the second segment 46 of the second system.

  Similarly, the second winding 33b whose start end is connected to the second segment 46 is wound around the 12th to 14th tooth portions T, and the end is connected to the third segment 46 of the third system. Connected. Similarly, the third winding 33c whose start end is connected to the third segment 46 is wound around the 13th to 15th tooth portions T and the end is the fourth segment 46 of the fourth system. Connected to. Similarly, the fifth to twenty-fourth windings (not shown) whose start ends are connected to the segments 46 of Nos. 5 to 24 are similarly wound around a predetermined tooth portion T and connected to the start ends. 46 is connected to the adjacent segment 46 counterclockwise.

  By winding in the above-described manner, as shown in FIG. 1, the winding 33 made up of the first to twenty-fourth windings is wound in a substantially U-shape in the slot between the teeth T. The In addition, the axial thickness of the site | part inserted between each axial direction projection parts 43 and 44 in the coil | winding 33 is comprised so that it may become smaller than the axial direction length of each axial direction projection parts 43 and 44, thereby, The winding 33 is wound so as not to protrude outward in the axial direction from the axial protrusions 43 and 44. Further, the radial thickness of the portion inserted between each radial protrusion 41 in the winding 33 is configured to be smaller than the radial length of each radial protrusion 41, whereby the winding 33 is formed. It is wound so as not to protrude outward in the radial direction from each radial protrusion 41. In addition, the portion of the winding 33 that is routed to the inner peripheral side of each of the axial protrusions 43 and 44 is bent inward in the axial direction (on the interposition member 34 side) and is more than the axial protrusions 43 and 44. The shape is arranged so as not to protrude outward in the axial direction.

  As shown in FIG. 6, the above-described two plus side brushes 26a and 26b and the two minus side brushes 26c and 26d have intervals of 90 degrees, 120 degrees, and 90 degrees, respectively, counterclockwise in the circumferential direction. It is arranged in the space. In other words, the plus side brushes 26a and 26b are arranged with an interval of 90 degrees, the plus side brush 26b and the minus side brush 26c are arranged with an interval of 120 degrees, and the minus side brushes 26c and 26d are arranged with an interval of 90 degrees. The minus side brush 26d and the plus side brush 26a are arranged with an interval of 60 degrees.

  Thereby, each plus side brush 26a, 26b contacts simultaneously with the segment 46 of the same system, and each minus side brush 26c, 26d contacts simultaneously with the segment 46 of the same system, and the plus side brush 26a, 26b contacts. The segment 46 and the segment 46 in contact with the minus side brushes 26c and 26d are different from each other.

  For example, as shown in FIG. 6, when the plus side brushes 26a and 26b are in contact with the first and seventh segments 46 of the first system, the minus side brushes 26c and 26d are the 16th and 22 of the fourth system. The number segments 46 are in contact with each other. As a result, the first system segment group (the first, seventh, thirteenth, and nineteenth segment 46) has the same potential as the positive power supply terminal, and the fourth system segment group (the fourth, tenth, 16th, and 16th). No. 22 and No. 22 segment 46) have the same potential as the negative pole power supply terminal.

  At this time, the negative potential from the first segment 46 of the positive potential is passed through the first winding 33a, the second segment 46, the second winding 33b, the third segment 46, and the third winding 33c. A current flows through the fourth segment 46. Further, from the first segment 46 having a positive potential, the 24th winding (not shown) connected to the first segment 46, the 24th segment 46, the 23rd winding (not shown), A current also flows through the # 23 segment 46 and the twenty-second winding (not shown) to the negative # 22 segment 46.

Next, the operation of this embodiment will be described.
A magnetic field generated in the armature core 31 by supplying power to the winding 33 through the power supply brush 26 and the segment 46 from the power source is the outer peripheral surface of the radial protrusion 41 (including the radially outer end surface of the core piece 36). From the axial end face of each of the axial protrusions 43 and 44 in the axial direction. The magnetic field of the armature core 31 is the magnetic field of the first to third field magnets 21 to 23 facing the outer peripheral surface of the radial protrusion 41 and the axial end faces of the axial protrusions 43 and 44, respectively. Interact, thereby causing the rotor 13 to rotate. As described above, since the magnetic flux contributing to the generation of torque is secured on the outer peripheral surface of the armature core 31 and the three axial end surfaces, it is possible to improve the output while suppressing an increase in the size of the motor 10. It has become.

  Next, the shift angle θ (see FIG. 2) of the magnetic pole centers C2 and C3 of the second and third field magnets 22 and 23 with respect to the magnetic pole center C1 of the first field magnet 21 and the cogging torque generated in the motor 10 The relationship will be described.

  In the present embodiment, the shift angle θ is equal to (180 / M), where M is the least common multiple of the number of magnetic poles of the first to third field magnets 21 to 23 and the number of teeth portions T (slot number) that are the same number. ) × 0.5 ≦ θ ≦ (180 / M) × 0.67. That is, in the present embodiment, the number of magnetic poles of the field magnets 21 to 23 is 8 and the number of the teeth portions T is 24. Therefore, the least common multiple M thereof is “24”, and the shift angle θ is It is set within the range of 3.75 ≦ θ ≦ 5.025.

  By setting the shift angle θ within this range, as shown in FIG. 7, when the shift angle θ is 0 degree (that is, the circumferential positions of the magnetic pole centers C1 to C3 of the field magnets 21 to 23 are the same). When the cogging torque is 100%, the cogging torque can be suppressed to about 40% or less. Further, the cogging torque is minimized when the shift angle θ is 4.25. That is, by setting the shift angle θ to θ = (180 / M) × 0.57 (degrees), the cogging torque can be most effectively reduced.

  FIG. 8 shows the relationship between the ratio D / L (see FIG. 1) between the outer diameter (diameter) D of the armature core 31 and the axial length L and the output (torque). In the figure, D / L = 1.0, that is, the output when the outer diameter D of the armature core 31 is equal to the axial length L is 100%. As shown in the figure, the output increases as D / L increases from 1.0, and D / L is within the range of 4.0 ≦ D / L ≦ 6.0 (approximately 5.0). The output becomes maximum at, and after that maximum value, the output decreases again. When D / L is greater than approximately 6.6, the output is less than 100%. That is, the range of 1 <D / L <6.6 is a range where the output exceeds 100%. Therefore, if D / L is set within the range of 1 <D / L <6.6, the output can be improved. If it is further set within the range of 4.0 ≦ D / L ≦ 6.0, the output can be improved. Further improvement is expected.

Next, characteristic effects of the present embodiment will be described.
(1) The stator 11 includes a first field magnet 21 that faces the outer peripheral surface of the armature core 31 in the radial direction, a second field magnet 22 that faces one end surface in the axial direction of the armature core 31, and an armature. A third field magnet 23 facing the other axial end surface of the core 31 is provided. According to this configuration, the magnetic flux can be secured on the outer peripheral surface of the armature core 31 and the both end surfaces in the axial direction facing the first to third field magnets 21 to 23, respectively. The output can be improved while suppressing an increase in size at 10.

  In the present embodiment, it is easy to secure an output even if the number of windings 33 is reduced. For this reason, it is possible to reduce the inductance by reducing the number of turns of the winding 33 while suppressing the decrease in output, and as a result, it is possible to suppress the occurrence of brush sparks and suppress the decrease in the life of the power supply brush 26. Is possible.

  When an aluminum wire is used for the winding 33, the aluminum wire is generally thicker than the copper wire, so that the number of turns is reduced. However, according to the present embodiment, an output can be ensured. That is, it is possible to ensure the output while reducing the weight of the rotor 13 by using the aluminum wire.

  (2) Each tooth portion T includes a radial protrusion 41 protruding radially outward, a first axial protrusion 43 protruding in one axial direction and facing the second field magnet 22 in the axial direction, It has the 2nd axial direction protrusion part 44 which protrudes in the other axial side and opposes the 3rd field magnet 23 in an axial direction. The windings 33 are wound between the circumferential directions of the radial protrusions 41, between the circumferential directions of the first axial protrusions 43, and between the circumferential directions of the second axial protrusions 44. The According to this configuration, the radial protrusion 41 and the first and second axial protrusions 43 and 44 of the tooth portion T are opposed to the first to third field magnets 21 to 23, respectively. The winding 33 can be suitably wound, which can contribute to an improvement in output.

  (3) Since the magnetic pole centers C1 to C3 of the first to third field magnets 21 to 23 are shifted in the circumferential direction, it is possible to contribute to suppression of cogging torque. Further, the cogging torque can be suitably suppressed by setting the shift angle θ within the range of (180 / M) × 0.5 ≦ θ ≦ (180 / M) × 0.67 (see FIG. 7). ).

  (4) The housing 12 includes a cylindrical member 14 and first and second disk members 15 and 16 assembled to both axial ends of the cylindrical member 14 (first and second opening end portions 14a and 14b), respectively. Become. And the 1st-3rd field magnet 21-23 each isolate | separated and comprised by the cylindrical member 14, the 1st disk member 15, and the 2nd disk member 16 is respectively fixed. According to this structure, after fixing the 1st-3rd field magnets 21-23 to the cylindrical member 14 and the 1st and 2nd disk members 15 and 16, respectively, the 1st and 2nd disk members 15 and 16 are attached. The housing 12 can be configured by being assembled to the cylindrical member 14, and the housing 12 can be easily formed. If the first and second disk members 15, 16 are allowed to rotate in the circumferential direction with respect to the cylindrical member 14, the second and third field magnets 22, 23 with respect to the first field magnet 21 will be described. The shift angle θ can be easily adjusted.

In addition, you may change the said embodiment as follows.
The configuration such as the shape of the armature core 31 is not limited to the above embodiment, and may be appropriately changed according to the configuration.

  For example, in the armature core 31 shown in FIG. 9, the first core piece 51 and the second core piece 52 are assembled from the outer peripheral side to the radially inner side with respect to both axial ends of each radial protrusion 41. Yes. Each of the core pieces 51 and 52 is partly embedded (press-fit) in the core body part 35 and partly provided so as to protrude from both axial end surfaces of the core body part 35. The protruding portion constitutes the first axial protruding portion, and the protruding portion of the second core piece 52 constitutes the second axial protruding portion. In FIG. 9, illustration of the winding 33 wound around the armature core 31 is omitted, but the winding mode is the same as in the above embodiment.

  A plate-shaped covering member 53 (covering portion) perpendicular to the axial direction is fixed to the axially outer end portions (axial tip portions) of the core pieces 51 and 52. Each covering member 53 is wider than the core pieces 51 and 52 in the circumferential direction, and is configured to cover both axial sides of the winding 33 wound around the armature core 31. The core pieces 51 and 52 are assembled to the radial protrusion 41 before the winding 33 is mounted, and the covering member 53 is assembled to the core pieces 51 and 52 after the winding 33 is mounted.

  According to such a configuration, the amount of protrusion of the first and second axial protrusions is determined with higher accuracy than in the above embodiment, which can contribute to improvement in motor performance. Further, by the covering member 53 provided on each of the core pieces 51 and 52 (first and second axial projecting portions), the facing area with the second and third field magnets 22 and 23 can be earned. As a result, the output can be further improved. Further, since the covering member 53 is a separate member with respect to each of the core pieces 51 and 52, deterioration of the assembling property of the winding wire 33 is prevented. In the armature core 31 of the above embodiment, a covering member 53 as shown in FIG. 9 may be provided at the axially outer ends (axial tip portions) of the first and second axial projecting portions 43 and 44. Good.

  In the example shown in FIG. 9, the covering member 53 is provided so that the center in the circumferential direction coincides with the center in the circumferential direction of the radial protrusion 41, but is not particularly limited thereto. For example, the circumferential center of the covering member 53 on the first core piece 51 side is shifted to one circumferential direction with respect to the circumferential center of the radial protrusion 41, and the circumferential center of the covering member 53 on the second core piece 52 side is shifted. You may comprise it shifting to the other circumferential direction (direction opposite to the shifting direction of the coating | coated member 53 by the side of the 1st core piece 51) with respect to the circumferential direction center of the radial direction protrusion part 41. FIG. According to this structure, it can contribute to the effect similar to the structure which shifted the magnetic pole center C1-C3 of the 1st-3rd field magnets 21-23 in the said embodiment to the circumferential direction, ie, suppression of cogging torque.

The configuration such as the shape of the commutator 32 is not limited to the above embodiment, and may be appropriately changed according to the configuration.
For example, in the rotor 13 shown in FIG. 10, a flat commutator 54 that is thin in the axial direction is disposed on the inner peripheral side of the tooth portion T and the winding 33. The commutator 54 is composed of a plurality of thin plate-like segments arranged in the circumferential direction, and is provided on the end surface of the interposition member 34 on the second disk member 16 side. The connection mode of the winding 33 to each segment of the commutator 54 is substantially the same as that in the above embodiment.

  Further, a brush holder 55 is supported on the second disk member 16, and a plurality of power supply brushes (not shown) that are in axial contact with the segments of the commutator 54 are held in the brush holder 55. . The power supply brush is provided so as to be slidable in the axial direction, and is urged toward the commutator 54 in the axial direction by a spring or the like (not shown).

According to such a configuration, since the commutator 54 is disposed on the inner peripheral side of the tooth portion T and the winding 33, it is possible to contribute to miniaturization of the motor 10 in the axial direction.
In the above embodiment, the stator 11 may be configured as a so-called continuous pole type (also referred to as a half magnet type) stator.

  For example, in the stator 11 shown in FIG. 11 and FIG. 12, either the N pole or the S pole of each of the field magnets 21 to 23 is thinned out from the configuration of the above embodiment, and the cylindrical member 14 and each disk member 15, 16 is configured to function as a magnetic pole (a magnetic pole different from the magnetic poles of the remaining magnets) between the circumferential directions of the field magnets 21 to 23 in FIG.

  More specifically, as shown in FIG. 12, on the inner peripheral surface of the cylindrical member 14, for example, four first field magnets 21 with N poles are provided at equal intervals in the circumferential direction (90 degree intervals). The cylindrical member 14 has first salient pole portions 61 that protrude radially inward between the circumferential directions of the first field magnets 21. In other words, the same number of first field magnets 21 and first salient pole portions 61 are alternately formed in the circumferential direction on the cylindrical member 14.

  The circumferential width of the first field magnet 21 is set to be larger than the circumferential width of the first salient pole portion 61, and is between the circumferential directions of the first field magnet 21 and the first salient pole portion 61. A gap is formed. Further, the inner peripheral surface of the first salient pole portion 61 is formed in an arc shape centering on the central axis of the cylindrical member 14 (the axis of the rotary shaft 18), and the inner diameter of the first salient pole portion 61 is It is formed equal to the inner diameter of the first field magnet 21. The cylindrical member 14 of this example has a shape divided every 90 degrees.

  The first disk member 15 is formed with four magnet housing portions 15c that are recessed outward in the axial direction (on the side opposite to the cylindrical member) at equal intervals in the circumferential direction, and in each of the magnet housing portions 15c, a first field magnet is formed. A second field magnet 22 having the same polarity as 21 is fixed. Further, the first disk member 15 has second salient pole portions 62 that protrude inward in the axial direction (on the cylindrical member 14 side) between the circumferential directions of the second field magnets 22. That is, the same number of second field magnets 22 and second salient pole portions 62 are alternately formed in the circumferential direction in the first disk member 15.

  The circumferential width of the second field magnet 22 is set equal to the circumferential width of the first field magnet 21, and the circumferential width of the second salient pole portion 62 is set equal to the circumferential width of the first salient pole portion 61. Has been. That is, the circumferential width of the second field magnet 22 is set larger than the circumferential width of the first salient pole portion 61. A gap is formed between the second field magnet 22 and the second salient pole portion 62 in the circumferential direction. The axially inner end surface of the second salient pole portion 62 forms a plane perpendicular to the axial direction, and the axially inner end surfaces of the second salient pole portion 62 and the second field magnet 22 are the same. Located on a plane.

The second disk member 16 has substantially the same configuration as the first disk member 15, and the third field magnets 23 and the third salient pole parts 63 fixed in the magnet housing part 16d are alternately arranged in the circumferential direction. It is configured.
In the above configuration, the magnetic flux of the first field magnet 21 acts on the first salient pole portion 61, so that the first salient pole portion 61 functions as a magnetic pole having a polarity different from that of the first field magnet 21. Similarly, when the magnetic flux of the second field magnet 22 acts on the second salient pole portion 62, the second salient pole portion 62 functions as a magnetic pole having a polarity different from that of the second field magnet 22. Similarly, when the magnetic flux of the third field magnet 23 acts on the third salient pole portion 63, the third salient pole portion 63 functions as a magnetic pole having a polarity different from that of the third field magnet 23. As described above, the stator 11 is configured as a so-called continuous pole type in which the salient pole portions 61 to 63 function as S poles when the field magnets 21 to 23 are, for example, N poles.

  In the configuration in which magnetic flux is taken on the outer peripheral side and both axial sides of the armature core 31, the number of magnets tends to increase. However, if the above-described continuous pole type is adopted, the number of field magnets 21 to 23 is increased. Can be reduced (half of the above embodiment), which is advantageous in terms of component management and can contribute to cost reduction.

  In the above-described embodiment, the first and second axial protrusions 43 and 44 are configured by the core piece 36 that is a separate body from the core body 35, but the first and second axial protrusions 43 , 44 may be formed integrally with the core body 35. In this case, it is preferable to compact the armature core from magnetic powder.

  In the above embodiment, the housing 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 above embodiment, with the magnetic pole center C1 of the first field magnet 21 as a reference, the magnetic pole center C2 of the second field magnet 22 is one circumferential direction, and the magnetic pole center C3 of the third field magnet 23 is the other circumferential direction. However, the present invention is not particularly limited to this. For example, the shifting direction in the circumferential direction of the second and third field magnets 22 and 23 may be the same direction, and the shifting angle of the second and third field magnets 22 and 23 may be different from each other. .

  Moreover, in the said embodiment, although the magnetic pole centers C1-C3 of the 1st-3rd field magnets 21-23 are mutually different, it is not specifically limited to this. For example, the magnetic pole centers of two of the first to third field magnets 21 to 23 (for example, the second field magnet 22 and the third field magnet 23) are set to the same position in the circumferential direction, and with respect to the position It is good also as a structure which shifted the magnetic pole center of the other field magnet (1st field magnet 21) to the circumferential direction.

  -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.
As shown in FIG. 13, the first and second axial protrusions 43 and 44 may be provided so as to be shifted in the circumferential direction with respect to the radial protrusion 41. At this time, the magnetic pole centers C1 to C3 of the first to third field magnets 21 to 23 may be shifted in the circumferential direction or may be aligned without being shifted in the circumferential direction. In FIG. 13 and FIGS. 14 to 16 described later, the winding 33 is not shown.

  As shown in FIG. 13, the radial protrusion 41 has a facing surface 41 b (outer peripheral surface) that faces the first field magnet 21 in the radial direction. The first axial protrusion 43 has a facing surface 43a (axial front end surface) that faces the second field magnet 22 in the axial direction. The second axially projecting portion 44 has a facing surface 44a (axially leading end surface) that faces the third field magnet 23 in the axial direction. And the circumference of the opposing surface 43a of the first axial projection 43 is based on the circumferential center position P1 of the opposing surface 41b of the radial projection 41 (center position between both circumferential end surfaces of the radial projection 41). The center position P2 in the circumferential direction is on the one side in the circumferential direction (left side in FIG. 13), and the center position P3 in the circumferential direction on the opposing surface 44a of the second axial protrusion 44 is on the other side in the circumferential direction (right side in FIG. 13). Is shifted by the shift angle θ1. In the example shown in FIG. 13, the core piece 36 is divided at the axial center position of the core body 35.

  According to such a configuration, the circumferential center positions P1 to P3 of the facing surfaces 41b, 43a, and 44a are shifted in the circumferential direction, and therefore the magnetic pole centers C1 to C1 of the field magnets 21 to 23 in the above-described embodiment. A cogging torque suppression effect substantially similar to the configuration in which C3 is shifted in the circumferential direction can be obtained.

  In the example shown in FIG. 13, the circumferential center position P2 of the opposing surface 43a of the first axial protrusion 43 is set to one circumferential direction, and the circumferential center position P3 of the opposing surface 44a of the second axial protrusion 44 is set. Although it is arranged to be shifted by the shift angle θ1 to the other in the circumferential direction, it is not particularly limited to this. For example, as shown in FIG. 14, the opposed surfaces 43a and 44a of the first and second axially projecting portions 43 and 44 are shifted in the circumferential direction with respect to the circumferential center position P1 of the opposed surface 41b of the radial projecting portion 41. The direction may be the same direction. Further, for example, the shift angles of the opposing surfaces 43a and 44a of the first and second axial protrusions 43 and 44 may be made different from each other.

  Further, for example, the center position in the circumferential direction of two of the facing surfaces 41b, 43a, 44a (for example, the facing surfaces 43a, 44a of the first and second axial protrusions 43, 44) is the same position in the circumferential direction, It is good also as a structure which shifted the circumferential direction center position of the other thing (opposing surface 41b of the radial direction protrusion part 41) with respect to the position in the circumferential direction. Such a configuration can also contribute to suppression of cogging torque.

  In the example shown in FIG. 13, the core piece 36 is divided into a part having the first axial protrusion 43 and a part having the second axial protrusion 44, but the present invention is particularly limited to this. Is not to be done.

  For example, as shown in FIG. 15, the first and second axial projecting portions 43 and 44 are connected to each other, and an insertion portion 36 a inserted into the core main body portion 35 is formed to be inclined in the circumferential direction. The second axial protrusions 43 and 44 may be formed so as to be integrated with each other. In addition, in the example of the same figure, it is preferable to assemble the core piece 36 with respect to the core main-body part 35 from the radial direction outer side (or radial direction inner side).

  For example, as shown in FIG. 16, the first and second axial protrusions 43 and 44 have flange-shaped circumferentially extending portions 70 (covering portions) extending from the distal ends in the axial direction to both sides in the circumferential direction. Are formed respectively. Each circumferential extending portion 70 has a plate shape orthogonal to the axial direction. Each circumferentially extending portion 70 covers the outer side in the axial direction of the portion of the winding 33 inserted through the slot between the first axial protrusions 43 and the slot between the second axial protrusions 44. In the example shown in the figure, the core piece 36 is configured by integrally including first and second axial projecting portions 43 and 44, and is assembled to the core main body portion 35 from the radially inner side.

  In the first and second axial projecting portions 43 and 44 having the circumferentially extending portion 70, the opposing surfaces 43 a and 44 a facing the second and third field magnets 22 and 23 in the axial direction respectively extend in the circumferential direction. It is comprised so that the surface (end surface on the opposite side to the core main-body part 35) of the protrusion part 70 may be included. Then, with reference to the circumferential center position P1 of the opposed surface 41b of the radial protrusion 41, the circumferential center position P2 of the opposed surface 43a of the first axial protrusion 43 is on one side in the circumferential direction (left side in FIG. 16). The circumferential center position P3 of the opposing surface 44a of the second axially projecting portion 44 is shifted to the other circumferential side (the right side in FIG. 16) by the same shift angle θ2.

  Also with such a configuration, the circumferential center positions P1 to P3 of the respective facing surfaces 41b, 43a, and 44a are shifted in the circumferential direction, and therefore the magnetic pole centers C1 to C3 of the field magnets 21 to 23 in the above embodiment. The cogging torque suppression effect substantially the same as that of the configuration in which is shifted in the circumferential direction can be obtained. Further, while securing the winding insertion space (slot) between the first axial projecting portions 43 and between the second axial projecting portions 44, the second and third field magnets 22, As a result, the output area can be further improved.

  In the example shown in FIG. 16, the core piece 36 is configured by integrally including the first and second axial protrusions 43 and 44, but the portion having the first axial protrusion 43 and the second axial direction It is good also as a structure divided | segmented into the site | part which has the protrusion part 44. FIG. In the example shown in FIG. 16, the core piece 36 is assembled to the core main body 35 from the inside in the radial direction. However, for example, the core piece 36 may be assembled from the outside in the radial direction.

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.
Next, a technical idea that can be grasped from the above embodiment and another example will be added below.

(A) In the rotating electrical machine according to any one of claims 1 to 8,
The commutator is disposed on the inner peripheral side of the teeth portion, and is configured such that the brush contacts the commutator in the axial direction.

According to this configuration, since the commutator is disposed on the inner peripheral side of the tooth portion, it is possible to contribute to downsizing of the rotating electrical machine in the axial direction.
(B) In the rotating electrical machine according to any one of claims 1 to 8 and (a) above,
The stator is of a continuous pole type.

According to this configuration, the number of first to third field magnet portions can be reduced, which is advantageous in terms of component management and can contribute to cost reduction.
(C) In the rotating electrical machine according to any one of claims 5 to 7,
The rotary electric machine according to claim 1, wherein the first and second axial projecting portions each have a covering portion that covers an outer side in the axial direction.

  According to this configuration, the covering portions provided on the first and second axial projecting portions can increase the facing area with the second and third field magnet portions, and as a result, the output is further improved. Can contribute.

(D) In the configuration of (c) above,
The rotating electrical machine characterized in that a circumferential center of the covering portion is displaced in a circumferential direction with respect to a circumferential center of the radial protrusion.

  According to this structure, it can contribute to suppression of cogging torque.

  DESCRIPTION OF SYMBOLS 10 ... Motor (rotary electric machine), 11 ... Stator, 12 ... Housing, 13 ... Rotor, 14 ... Cylindrical member (tubular member), 15 ... 1st disk member (1st plate-shaped member), 16 ... 2nd disk member (Second plate-like member), 18 ... rotating shaft, 21 ... first field magnet (first field magnet part), 22 ... second field magnet (second field magnet part), 23 ... third field Magnets (third field magnet part), 26 ... brush for feeding, 31 ... armature core, 32, 54 ... commutator, 33 ... winding, 41 ... radial protrusion, 41b ... facing surface (radial facing) Surface), 43... First axial projecting portion, 43 a. Opposed surface (first axial facing surface), 44. Second axial projecting portion, 44 a. Opposed surface (second axial facing surface), 51. 1 core piece (1st axial direction protrusion part), 52 ... 2nd core piece (2nd axial direction protrusion part), T ... Teeth part, C1-C3 ... Magnetic pole center.

Claims (8)

An armature core and a commutator are provided on a rotary shaft so as to be integrally rotatable, and windings wound around a plurality of teeth arranged in parallel in the circumferential direction of the armature core are electrically connected to the commutator. And the rotor
A brush that is pressed against the commutator and electrically connected to the commutator;
A first field magnet portion radially facing the outer peripheral surface of the armature core; a second field magnet portion facing one axial end surface of the armature core; and the other axial end surface of the armature core. And a third field magnet portion opposed to the stator provided in the housing. In the rotating electrical machine according to claim 1,
The magnetic pole centers of one or two field magnet parts of the first to third field magnet parts and the magnetic pole centers of the other field magnet parts are arranged shifted in the circumferential direction. A rotating electric machine that is characterized. The rotating electrical machine according to claim 2,
The rotating electrical machine characterized in that the magnetic pole centers of the first to third field magnet portions are arranged shifted in the circumferential direction. In the rotating electrical machine according to claim 3,
With reference to the magnetic pole center of the first field magnet part, the magnetic pole center of the second field magnet part is at one side in the circumferential direction and the magnetic pole center of the third field magnet part is at the same angle at the other side in the circumferential direction. Arranged by a shift angle θ,
The shift angle θ is equal to each other, where M is the least common multiple of the number of magnetic poles of each field magnet portion and the number of teeth portions.
(180 / M) × 0.5 ≦ θ ≦ (180 / M) × 0.67
A rotating electrical machine characterized by being set within a range of. In the rotating electrical machine according to any one of claims 1 to 4,
The plurality of teeth portions are
A radial protrusion protruding radially outward;
A first axial protrusion that protrudes in one axial direction and faces the second field magnet portion in the axial direction;
Each having a second axial projecting portion projecting to the other side in the axial direction and facing the third field magnet portion in the axial direction;
The windings are wound between the circumferential directions of the radial projections, between the circumferential directions of the first axial projections, and between the circumferential directions of the second axial projections. Rotating electric machine characterized by that. In the rotating electrical machine according to claim 5,
The radial protrusion has a radial facing surface that faces the first field magnet portion in the radial direction;
The first axial projecting portion has a first axial facing surface facing the second field magnet portion in the axial direction,
The second axial projecting portion has a second axial facing surface facing the third field magnet portion in the axial direction,
The circumferential center position of one or two opposing surfaces of the radial facing surface, the first axial facing surface, and the second axial facing surface, and the circumferential central position of the other facing surfaces Are arranged so as to be shifted in the circumferential direction. In the rotating electrical machine according to claim 6,
A rotating electrical machine characterized in that circumferential center positions of the radial facing surface, the first axial facing surface, and the second axial facing surface are shifted in the circumferential direction. In the rotating electrical machine according to any one of claims 1 to 7,
The first to third field magnet parts are configured to be separated from each other,
The housing includes a cylindrical member having the first field magnet portion fixed to an inner peripheral surface, and a first plate shape assembled to one end in the axial direction of the cylindrical member and the second field magnet portion fixed. A rotating electrical machine comprising: a member; and a second plate-like member assembled to the other axial end of the cylindrical member and having the third field magnet portion fixed thereto.