JP2016135015A - Commutator, armature and motor with brush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a commutator capable of reducing cost while presenting the same noise cancellation performance by decreasing the number of resistors for noise cancellation.SOLUTION: Among neighboring segments 111 of mutually different phases, between segments 111 with the same combination of phases of both the segments 111, neighboring segments 111 are connected by a resistor 150 between the segments 111 at least in one location. Each of the resistors 150 is placed and fixed on a planar placement surface 118 that is secured at least between a brush slide surface 117 and a riser 114 of each of the segments.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a commutator, an armature, and a motor with a brush.

  Generally, a motor with a brush has a configuration in which an armature is rotatably disposed inside a cylindrical yoke having a permanent magnet attached to an inner peripheral surface. The armature has an armature core that is externally fixed to the rotating shaft. A plurality of teeth for winding an armature coil are formed radially on the armature core, and the armature coil is wound around these teeth via an insulator. The armature coil is electrically connected to a commutator that is fitted and fixed to the rotation shaft adjacent to the armature core.

  The commutator has a substantially cylindrical commutator body made of resin, and a plurality of segments exposed on the rotational sliding surface of the commutator body. Each segment is formed of a plate-shaped metal piece, and a riser is integrally formed at the end of each segment. An armature coil winding is wound around and connected to this riser.

  A brush is slidably contacted with each segment of the commutator. By supplying power from the brush to the armature coil through the segment, a magnetic field is formed in the armature coil. The rotating shaft is rotated by a magnetic attractive force or a repulsive force generated between the magnetic field formed in the armature coil and the permanent magnet of the yoke.

  By the way, in this type of motor with a brush, when the segment moves away from the brush as the armature rotates, that is, when the power supply from the brush is switched from one segment of the commutator to the other, the electromagnetic energy stored in the coil Is discharged, an electric discharge (arc) is generated between the brush and the segment, which may cause electrical noise.

  For this reason, an element for preventing noise is provided outside or inside the motor with brush. Patent Document 1 discloses, as an example, a commutator including a resistance element for noise removal.

FIG. 11 shows a commutator described in Patent Document 1.
This commutator 500 includes a cylindrical commutator body 501 having an insulating property that is externally fitted and fixed on a rotating shaft 550, and a plurality of segments 503 that are arranged and fixed in the circumferential direction in a state of being exposed on the outer periphery of the commutator body 501. It is equipped with. A gap (groove) 507 is secured between adjacent segments 503. Between the adjacent segments 503, a resistor 505, which is an element for removing noise that connects both segments 503, is disposed.

JP-A-6-209544

However, in the commutator 500 described in Patent Document 1 described above, the resistors 505 are arranged between the segments 503 of the commutator 500. Therefore, there is a problem that the number of the resistors 505 is large and the cost is increased.
Further, there is a problem that the connecting work of the winding of the armature coil to the segment 503 becomes troublesome because the resistor 505 is obstructive.

  Accordingly, the present invention has been made in view of the above-described circumstances, and can reduce the cost while reducing the number of resistors for noise removal and exhibiting the same noise removal performance, and can reduce the armature. The present invention provides a commutator, an armature, and a brush motor that can improve the connection workability of a coil winding and the assembly workability of a resistor.

  In order to solve the above problems, a commutator according to the present invention is exposed to an insulating commutator body that is externally fitted and fixed to a rotation shaft, and is exposed to a brush sliding surface of the commutator body, in a circumferential direction of the commutator body. And a plurality of segments arranged adjacent to each other with a gap between them, each armature coil winding being connected to the riser, and a feeding brush slidingly contacting with the rotation of the rotating shaft, Among the segments having mutually different phases in the direction, between the segments having the same combination of phases of both segments, each of the adjacent segments is connected by a resistor for at least one segment. The resistor is placed on a placement surface secured at least between the brush sliding contact surface of each segment and the riser. Characterized in that fixed.

  By comprising in this way, generation | occurrence | production of the arc when a segment leaves | separates a brush can be prevented, and reduction of a noise and suppression of wear of a brush can be aimed at. In addition, by providing the resistor mounting surface in the vicinity of the riser of each segment, the resistor is attached to the mounting surface by fusing (thermal caulking) using the winding fusing process for the riser. Can do. Accordingly, the workability of connecting the windings of the armature coil and the workability of assembling the resistor can be improved.

  In the commutator according to the present invention, a planar mounting surface that straddles both segments is formed between the segments connected by the resistor, and the two segments are straddled on the planar mounting surface. The resistor is placed and fixed on the board.

  By configuring in this way, the resistor is placed and fixed on the flat placing surface, so that the resistor can be arranged on the segment in a stable posture. Further, the positioning and fixing of the resistor can be facilitated, and the assembly workability of the resistor can be improved. For example, when the mounting surface of the resistor is curved, it may be difficult to position and fix the resistor. However, forming the mounting surface in a flat shape causes such difficulty. And the resistor can be easily assembled to the segment.

  The commutator which concerns on this invention was equipped with the short circuit member which short-circuits the segments which become the same phase among the said several segments.

  As described above, since the same-phase segment is short-circuited by the short-circuit member, the necessary number of resistors for noise reduction can be minimized, and the cost can be reduced.

  In the commutator according to the present invention, the segment having the same phase and the short-circuit member are formed integrally and integrally with the same member to form an assembly, and a plurality of the assemblies are at least short-circuited. The member is assembled to the commutator body in a state where the member is embedded in the commutator body.

  By comprising in this way, a short circuit member is not exposed from a commutator main body, and size reduction of a commutator can be achieved. Moreover, a short circuit member can be functioned as an anchor which prevents that a segment peels from a commutator main body. For this reason, it becomes possible to provide a commutator with stable quality.

  The commutator according to the present invention is characterized in that the number of the resistors is three when the number of segments is nine and the phase of the armature coil is three phases.

  By configuring in this way, the nine segments of U phase, V phase, and W phase are the minimum between U phase and V phase, V phase and W phase, and W phase and U phase segments. The connection can be made with three resistors.

  An armature according to the present invention includes a commutator, a rotary shaft on which the commutator is externally fitted and fixed, and an armature core which is externally fixed on the rotary shaft and on which a winding of an armature coil is wound. Features.

  By comprising in this way, the armature which can aim at reduction of noise can be provided at low cost.

  The brush motor according to the present invention includes an armature, a yoke formed in a cylindrical shape so as to cover the periphery of the armature, and a magnetic pole provided on an inner peripheral surface thereof, and a brush provided so as to be slidable in contact with the segment. And.

  By comprising in this way, the motor with a brush which can aim at reduction of noise can be provided at low cost.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the arc when a segment leaves | separates a brush can be prevented, noise reduction and brush wear suppression can be aimed at. In addition, by providing the resistor mounting surface in the vicinity of the riser of each segment, the resistor is attached to the mounting surface by fusing (thermal caulking) using the winding fusing process for the riser. Can do. Accordingly, the workability of connecting the windings of the armature coil and the workability of assembling the resistor can be improved.

It is an external appearance perspective view which shows the structure of the motor with a reduction gear in embodiment of this invention. It is A arrow directional view of FIG. It is BB arrow sectional drawing of FIG. It is a perspective view which shows the structure of the armature in embodiment of this invention. It is a perspective view which shows the structure of the commutator in embodiment of this invention. It is sectional drawing which shows the structure of the said commutator. It is a disassembled perspective view of the metal parts which comprise the said commutator, and a perspective view of the assembly body of these parts. It is a perspective view which shows the state which attached the resistor to the said assembly. It is a perspective view which shows the state which attached the resistor to the said assembly | attachment body seeing from the opposite direction to FIG. It is a disassembled perspective view of the commutator. It is a perspective view of the commutator which gave the conventional noise countermeasure.

(Motor with reduction gear)
Next, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is an external perspective view showing a configuration of a motor with a reduction gear, FIG. 2 is a sectional view taken along arrow A in FIG. 1, and FIG. 3 is a sectional view taken along arrow BB in FIG.

  A motor M with a reduction gear according to the present embodiment shown in FIGS. 1 to 3 is provided at a back door of a vehicle, for example, and a rear wiper driving device that rotates a rear wiper (not shown) for wiping the rear window glass of the vehicle. It is used for.

  The motor M with a speed reducer includes an electric motor unit 1 disposed on one side (right side in FIGS. 1 to 3), a speed reduction mechanism unit 70 disposed on the other side (left side in FIGS. 1 to 3), Consists of.

  The reduction mechanism unit 70 is a part that decelerates the rotation generated by the electric motor unit 1 and outputs it from the output shaft 78, and the rotation axis L <b> 1 of the output shaft 78 in a direction orthogonal to the motor axis L <b> 3 of the electric motor unit 1. In this state, the electric motor unit 1 is integrally coupled.

  The electric motor unit 1 and the reduction mechanism unit 70 are made of a metal motor housing (yoke) 2 constituting a main case of the electric motor unit 1, and the main case of the reduction mechanism unit 70 and the remaining part of the electric motor unit 1. It is integrated by fastening with a bolt 72 to a gear case 71 constituting the case.

  The electric motor unit 1 is configured as a DC brushed motor, and includes a cylindrical stator 10 configured by disposing a permanent magnet 4 on the inner periphery of a peripheral wall 2a of a bottomed cylindrical motor housing (yoke) 2, and a stator 10 And an armature (rotor) 3 provided rotatably inside.

(Stator)
At least six magnetic poles (three N poles and three S poles) are arranged on the inner peripheral surface along the circumferential direction on the inner periphery of the peripheral wall 2a of the motor housing (yoke) 2, which is the main element of the stator 10. One permanent magnet 4 is arranged. In the case of a single permanent magnet 4, the permanent magnet 4 is formed in a substantially cylindrical shape along the inner periphery of the peripheral wall 2 a of the motor housing 2.

  The six magnetic poles on the inner peripheral surface of the permanent magnet 4 have N poles and S poles alternately arranged in the circumferential direction. In addition, a boss portion 2 d that protrudes outward in the axial direction is formed at the substantially central portion in the radial direction at the end portion (bottom portion) 2 b of the motor housing 2. A bearing 12 is fitted in the boss portion 2d, and one end of a rotating shaft (motor rotating shaft) 5 of the armature 3 is rotatably supported by the bearing 12. The other end of the rotating shaft 5 of the armature 3 is inserted into the gear case 71 and is rotatably supported by a bearing 80 fitted in the gear case 71.

(Armature)
FIG. 4 is a perspective view showing the configuration of the armature.
As shown in FIGS. 3 and 4, the armature 3 includes a rotary shaft 5 that is disposed inside a cylindrical stator 10 and rotates around the motor axis L <b> 3, and an armature core 6 that is externally fixed to the rotary shaft 5. And an armature coil 7 wound around the armature core 6 and a commutator 100 disposed adjacent to the armature core 6 on the speed reduction mechanism portion 70 side of the rotating shaft 5.

  The armature core 6 is formed by laminating a plurality of metal plates in the axial direction or press-molding soft magnetic powder. Although not shown in detail, the armature core 6 has nine teeth that are substantially T-shaped in a plan view in the axial direction and are radially formed at equal intervals in the circumferential direction. A dovetail slot is provided between adjacent teeth. It has been. An enamel-coated winding is passed through this slot, and this winding is wound around each tooth from above the insulator. As a result, a plurality of armature coils 7 are formed on the outer periphery of the armature core 6.

  The windings are connected to nine segments 111 arranged on the rotational sliding surface (outer peripheral surface) of the commutator 100. That is, the motor 2 has a so-called 6-pole 9-slot 9-segment three-phase (U-phase, U-phase) in which the number of permanent magnets 4 (magnetic poles) is 6, the number of teeth and slots is 9, and the number of segments 111 is 9. V-phase and W-phase) motors. Details of the commutator 100 will be described later.

(Brush unit)
As shown in FIG. 3, the motor housing 2 of the electric motor unit 1 configured as described above is fastened and fixed to the gear case 71 by bolts 72 with the opening end 2 c facing the gear case 71 side. A brush housing portion 16 having an opening surface directed toward the opening end 2c of the motor housing 2 is provided at a location where the motor housing 2 of the gear case 71 is attached.

  As shown in FIG. 2, a brush unit accommodation space 16a is secured in the brush housing portion 16, and the brush unit 21 is accommodated and fixed in the brush unit accommodation space 16a. The brush unit 21 includes a pair of brushes 22 that are held by the brush holder 23 and are in sliding contact with the segment 111 of the commutator 100.

  The brush 22 is urged toward the center of the rotating shaft 5 by a spring, and the tip of the brush 22 is in sliding contact with the outer periphery of the segment 111 of the commutator 100. The brush 22 is electrically connected to a connector portion 73 provided on the gear case 71, and a connector extending from an external power source (not shown) can be fitted into the connector portion 73. Then, the power from the external power source is supplied to the armature coil 7 through the connector portion 73, the brush 22, and the segment 111.

(Deceleration mechanism)
As shown in FIGS. 2 and 3, the speed reduction mechanism unit 70 includes a worm shaft 74 housed in the gear case 71, a worm wheel 75 meshed with the worm shaft 74, and a first connection connected to the worm wheel 75. The plate 76 and the second connection plate 77 connected to the first connection plate 76 are configured. The worm shaft 74 is integrated with the rotating shaft 5 of the electric motor unit 1, and the electric motor unit 1 side of the worm shaft 74 is rotatably supported by a bearing 80 housed and fixed in the gear case 71. On the other hand, the end of the worm shaft 74 opposite to the electric motor unit 1 is disposed close to the load receiving unit 81 that receives a reaction force generated by meshing with the worm wheel 75.

  The first connection plate 76 is a member formed in a long plate shape. One end side of the first connection plate 76 is rotatably connected to a connection shaft 79 provided on the worm wheel 75. The other end side of the first connection plate 76 is rotatably connected to one end side of the second connection plate 77. An output shaft 78 is attached to the other end of the second connection plate 77 in a state where relative rotation with the second connection plate 77 is restricted. The output shaft 78 extends in a direction orthogonal to the rotating shaft 5 and the worm shaft 74.

  With this configuration, when the worm wheel 75 rotates, the connecting shaft 79 provided on the worm wheel 75 rotates along the circumferential direction of the worm wheel 75. The first connecting plate 76 and the second connecting plate 77 that are rotatably connected to each other perform a link operation by the rotational movement of the connecting shaft 79. And the output shaft 78 attached to the 2nd connection plate 77 rotates by this link operation | movement. The output shaft 78 reciprocates once when the worm wheel 75 to which the connecting shaft 79 is attached rotates once. As the output shaft 78 reciprocates, a rear wiper (not shown) attached to the output shaft 78 rotates.

(Commutator)
Next, the commutator 100 will be described in detail with reference to FIGS.
FIG. 5 is a perspective view showing the configuration of the commutator, FIG. 6 is a cross-sectional view showing the configuration of the commutator, FIG. 7 is an exploded perspective view of metal parts constituting the commutator, and a perspective view of an assembly of these components, FIG. 8 is a perspective view showing a state in which the resistor is attached to the assembly, FIG. 9 is a perspective view showing the state in which the resistor is attached to the assembly from the opposite direction to FIG. 8, and FIG. It is a disassembled perspective view of a commutator.

  As shown in FIG. 4, the commutator 100 is disposed on the speed reduction mechanism unit 70 side on the rotating shaft 5. As shown in FIGS. 5 to 10, the commutator 100 includes a columnar commutator body 120 that is externally fitted and fixed to the rotary shaft 5, and nine sheets that are disposed so as to be exposed on the outer peripheral surface of the commutator body 120 ( The same number of slots 111 as the number of slots 111, and the planar (axial view) annular (or C-annular) plate-like short-circuit member 115 that short-circuits the segments 111 having the same potential (same phase). I have.

  Here, since there are three phases and nine segments, as shown in FIG. 6, the nine segments 111 are composed of U phase, V phase, W phase, U phase, V phase, W phase, U phase, V phase, W phase. Are arranged in the circumferential direction in this order. In addition, among the segments 111 having different phases in the circumferential direction, between the segments 111 having the same phase combination of both the segments 111, the resistance between the adjacent segments 111 is only between one segment 111. The body 150 is connected.

  That is, three resistors 150 are provided, and are continuous in the circumferential direction between the V-phase and W-phase segments 111, between the W-phase and U-phase segments 111, and between the U-phase and V-phase segments 111. The two segments 111 are connected to each other.

  Moreover, as shown in FIG. 5, each resistor 150 is mounted and fixed on a mounting surface 118 secured between at least the brush sliding contact surface 117 of each segment 111 and the riser 114. The planar placement surface 118 is formed in a planar shape so as to straddle the adjacent segments 111. A resistor 150 is placed and fixed on the planar placement surface 118 so as to straddle both segments 111.

  Further, the commutator main body 120 is molded by resin, and has a through hole into which the rotary shaft 5 can be press-fitted at the center in the radial direction. The short-circuit member 115 is embedded in the commutator body 120 which is a resin mold body.

  Since the electric motor unit 1 is a so-called 6-pole 9-slot 9-segment three-phase motor, there are three segments 111 having the same potential per phase. For this reason, the three segments 111 and the one short-circuit member 115 form one set, and there are three sets.

  Here, as shown in the upper diagram of FIG. 7, the three segments 111 having the same potential and the short-circuit member 115 for short-circuiting them are formed in series and integrally by the same member, and each of the three segments is made of three metals. Components (assembled bodies) 110A, 110B, and 110C are configured. The lower drawing of FIG. 7 shows a metal assembly 110 configured by combining three metal parts 110A, 110B, and 110C.

  Each of the metal parts 110A, 110B, and 110C is formed by punching a metal plate (not shown) by pressing to form three blanks, and bending these three blanks. Each blank has an annular (or C-annular) short-circuit member 115, and three segments 111 are arranged at equal intervals in the circumferential direction on the outer peripheral edge of the short-circuit member 115 and extend radially. It is integrally molded. The segment 111 having a shape along a part of the cylindrical wall is formed by bending the connecting portion 112 between each segment 111 and the short-circuit member 115. These segments 111 are arranged at equal intervals in the circumferential direction.

  Each segment 111 is formed with an anchor groove 113 on the inner surface that contacts the commutator body 120. The anchor groove 113 is formed in a dovetail shape, and is formed along the longitudinal direction of the segment 111 from the distal end of the segment 111 to the proximal end. The anchor groove 113 is for increasing the fixing force between the commutator main body 120 and the segment 111 and preventing the segment 111 from peeling off from the commutator main body 120. In addition, a riser 114 for fixing the winding of the armature coil 7 is formed at the center in the width direction at the tip of each segment 111 by bending.

  The three metal parts 110A, 110B, 110C are insulated from each other when the metal assembly 110 is combined as shown in the lower diagram of FIG. The segments 111 are arranged at the same position in the axial direction at regular intervals along the circumferential direction, and the three short-circuit members 115 are arranged at intervals in the axial direction.

When obtaining a finished product of the commutator 100, the metal assembly 110 is assembled by combining the three metal parts 110 </ b> A, 110 </ b> B, 110 </ b> C, and then the shorting member 115 has the same shaft diameter as the rotary shaft 5. Insert the set jig shaft. Next, a resin material is filled between the jig shaft and the inner surface of each segment 111, and the commutator main body 120 is molded. Thus, the commutator main part in which the short-circuit member 115 is embedded in the commutator main body 120 is completed. .
Thereafter, as shown in FIG. 10, the end plate 122 is attached to the main commutator part, thereby completing the commutator 100 as shown in FIG. In this commutator 100, a gap 116 as an insulating groove is secured between adjacent segments 111.

  Here, since the segments 111 having the same potential and the short-circuit member 115 are integrally formed, the short-circuit member 115 is embedded in the commutator body 120 so that the short-circuit member 115 is separated from the commutator body 120. It also functions as an anchor that prevents peeling of 111. Further, since the anchor groove 113 is formed on the inner surface of the segment 111, it is reliably prevented that the segment 111 is peeled off from the commutator main body 120.

  As shown in FIG. 4, the commutator 100 configured in this manner is fixed to the rotary shaft 5, and the armature 3 is configured by connecting the windings of the armature coil 7 to the riser 114 of each segment 111.

(effect)
Therefore, according to the above-described embodiment, the action of the resistor 150 attached to the commutator 100 can prevent the generation of arc when the segment 111 leaves the brush 22, thereby reducing noise and suppressing wear of the brush 22. Can be achieved.

Further, since the in-phase segment 111 is short-circuited by the short-circuit member 115, the necessary number of resistors 150 for noise reduction can be minimized, and the cost can be reduced. Further, by providing the mounting surface 118 of the resistor 150 in the vicinity of the riser 114 of each segment 111, the resistor 150 is fusing (heat caulking) using a winding fusing process for the riser 114. It can be attached to the mounting surface 118. Accordingly, the workability of connecting the windings of the armature coil 7 and the workability of assembling the resistor 150 can be improved.
Furthermore, it is sufficient if there is a space for fixing the winding of the armature coil 7 in the vicinity of the riser 114, and the brush sliding contact surface 117 cannot be used between the adjacent risers 114. It was. Therefore, by providing the mounting surface 118 in the vicinity of the riser 114 in the axial direction of the commutator 100, an increase in the size of the commutator 100 in the axial direction can be suppressed.

Further, since the resistor 150 is mounted and fixed on the flat mounting surface 118, the resistor 150 can be disposed on the segment 111 in a stable posture.
Furthermore, the positioning and fixing of the resistor 150 can be facilitated, and the assembly workability of the resistor 150 can be improved. For example, when the mounting surface of the resistor 150 is a curved surface, positioning and fixing of the resistor 150 may be difficult. However, by forming the mounting surface 118 in a flat shape, The resistor 150 can be easily assembled to the segment 111 without difficulty.

Further, since the metal assembly 110 is assembled to the commutator body 120 with the short-circuit member 115 embedded in the commutator body 120, the short-circuit member 115 is not exposed from the commutator body 120, and the commutator 100 can be reduced in size. .
Furthermore, the short-circuit member 115 can function as an anchor that prevents the segment 111 from being peeled off from the commutator body 120. For this reason, it becomes possible to provide the commutator 100 of stable quality.

  Also, for the nine segments of the U phase, V phase, and W phase, the minimum number of three segments 111 between the U phase and V phase, the V phase and W phase, and the W phase and U phase segment 111 By connecting with the resistor 150, noise can be effectively reduced, so that the number of parts and cost can be reduced.

The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention.
For example, in the above-described embodiment, the commutator 100 short-circuits the columnar commutator main body 120, the segment 111 disposed so as to be exposed on the outer peripheral surface of the commutator main body 120, and the segments 111 having the same potential. The case where the short-circuit member 115 is provided has been described. However, the present invention is not limited to this, and a so-called disk-type commutator in which segments are arranged in a circumferential direction on one end surface of a commutator body formed in a disc shape also includes the mounting surface 118 and the resistor. The connection configuration of the body 150 can be applied. Alternatively, the short-circuit member 115 may be integrated with the corresponding segment 111 and not embedded in the commutator main body 120, but the segments having the same potential may be connected separately using a short-circuit line using the riser 114 or the like.

In the above-described embodiment, among the segments 111 having different phases in the circumferential direction adjacent to each other, the segments 111 having the same phase combination of both segments 111 are adjacent to each other only between one segment 111. The case where the segments 111 to be connected are connected by the resistor 150 has been described. However, the present invention is not limited to this, and the resistor 150 may be provided between all adjacent segments 111.
Even if the segments 111 having the same potential are not connected to each other using the short-circuit member 115, if the resistor 150 is connected to at least one location between the segments 111 having the same phase combination, this resistance Compared with the case where the body 150 is not connected, it is possible to reduce noise and suppress wear of the brush 22 when the electric motor unit 1 is driven.

1 ... Electric motor (brush motor)
2 ... Motor housing (yoke)
DESCRIPTION OF SYMBOLS 3 ... Armature 4 ... Permanent magnet 5 ... Rotating shaft 6 ... Armature core 7 ... Armature coil 22 ... Brush 100 ... Commutator 110A-110C ... Metal parts (assembly)
DESCRIPTION OF SYMBOLS 111 ... Segment 114 ... Riser 116 ... Gap 115 ... Short-circuit member 117 ... Brush-sliding contact surface 118 ... Mounting surface 120 ... Armature body 150 ... Resistor

Claims (7)

An insulating commutator body that is externally fitted and fixed to the rotary shaft;
Exposed to the brush sliding surface of the commutator main body, and arranged in a circumferential direction with a gap between adjacent ones in the circumferential direction of the commutator main body, and windings of armature coils are connected to the risers, respectively. A segment in which the power supply brush slides in response to the rotation of
With
Among the segments having mutually different phases in the circumferential direction, between the segments having the same combination of phases of both segments, at least one of the segments is connected to each other by a resistor. The commutator is characterized in that each resistor is mounted and fixed on a mounting surface secured at least between the brush sliding surface of each segment and the riser.   Between the segments connected by the resistor, a planar mounting surface that spans both segments is formed, and the resistor is mounted on the planar mounting surface so as to straddle both segments. The commutator according to claim 1, wherein the commutator is placed and fixed.   The commutator according to claim 1, further comprising: a short-circuit member that short-circuits the segments having the same phase among the plurality of segments.   The segment having the same phase and the short-circuit member are formed integrally and integrally with the same member to form an assembly, and at least the short-circuit member is embedded in the commutator body. 4. The commutator according to claim 3, wherein the commutator is assembled to the commutator main body in a state where the commutator is attached.   5. The commutator according to claim 1, wherein when the number of segments is nine and the phase of the armature coil is three-phase, the number of the resistors is three. The commutator according to any one of claims 1 to 5,
The rotating shaft to which the commutator is externally fixed;
An armature core that is externally fitted and fixed to the rotating shaft and wound with a winding of an armature coil;
Armature characterized by having. An armature according to claim 6;
A yoke formed in a cylindrical shape so as to cover the periphery of the armature, and provided with a magnetic pole on its inner peripheral surface;
A brush provided to be slidable on the segment;
A motor with a brush.

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