JP2023032371A - motor - Google Patents

Abstract

To provide a motor capable of easily connecting segments with the same phase, in the case where the number of brushes is not increased and the number of electrodes in a permanent magnet is increased.SOLUTION: A motor with a brush comprises: a core that has magnet attached to a yoke, a plurality of teeth, and a coil, and is attached to a shaft 201; and a commutator 250 that includes a plurality of segments 260 arranged on an outer periphery, and electrically connects each segment of each phase and the coil. The commutator comprises a connection wire board 270 including: a first annular copper plate having a first diameter which is smaller than that of an interval of the segments facing each other as using a shaft as a center; a second annular copper plate that has a second diameter smaller than the first diameter; a third annular copper plate having a third diameter smaller than the second diameter; and a foot part that is extended from each annular copper plate until a connection of them to a different segment, and is welded and connected to the contacted segment.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to brushed motors.

DC motors that use permanent magnets as magnetic field sources include motors with brushes.
Some motors with brushes require the same number of brushes as the number of poles of the permanent magnets because they are driven by energizing the coils with a current having a period equal to the number of pole pairs of the permanent magnets.
On the other hand, motors have been disclosed in which the number of magnetic poles of permanent magnets can be increased without increasing the number of brushes.
For example, Patent Literature 1 describes a brushed three-phase DC motor in which segments having the same potential are short-circuited by a connection line, that is, a brushed motor in which in-phase segments of a commutator are connected by a connection line. ing.

WO2010/010906

However, in the motor as shown in Patent Document 1, it tends to be difficult to determine a wiring method that does not adversely affect the connection wires that connect the same-phase segments and the copper wires that form the coils. was there.

SUMMARY OF THE INVENTION The present disclosure is intended to solve the above problems, and to provide a motor with brushes, in which when the number of poles of permanent magnets is increased without increasing the number of brushes, it is possible to easily connect segments of the same phase. With the goal.

The motor of the present disclosure is a brushed motor having a plurality of magnets mounted at equal intervals along the yoke and alternately positioned at different magnetic poles, and a magnetic field generated inside the yoke by the magnets. A core having a plurality of teeth and a coil wound around the teeth and attached with the shaft as a central axis, and a plurality of segments arranged on a circumference centered on the shaft. a commutator that electrically connects the segments of each phase and the coil in a state in which the plurality of segments are divided into three phases, the commutator having a first commutator smaller than an interval between the segments facing each other about the shaft; a second annular copper plate centered about the shaft having a second diameter less than the first diameter; and a third diameter centered about the shaft less than the second diameter. A connection board having a third annular copper plate and legs extending from each annular copper plate until they contact different segments and are welded to the contacted segments.

According to the present disclosure, it is possible to provide a motor having a configuration in which in-phase segments are easily connected when the number of poles of permanent magnets is increased without increasing the number of brushes in a motor with brushes.

1 is a schematic cross-sectional view of a motor according to the present disclosure; FIG. 1 is a perspective view of a rotor that constitutes a motor; FIG. It is a figure explaining the structure of a rotor. Figure 3 shows the rotor looking towards arrow B in Figure 2; FIG. 4 is an enlarged view of members in a state where a commutator is removed from the rotor in FIG. 3; 6 is a view of the member of FIG. 5 looking toward arrow C; FIG. 4 is an enlarged view of the commutator in FIG. 3; FIG. FIG. 8 is a view of the commutator of FIG. 7 viewed toward arrow D; 4 is an enlarged view of a segment in FIG. 3; FIG. 4 is an enlarged view of the wiring board in FIG. 3; FIG. 4 is an enlarged view of a connection copper plate in FIG. 3; FIG. FIG. 4 is an enlarged view of members in a state in which the segment and the wire connection board in FIG. 3 are assembled; 13 is a diagram showing a connection state between the segment and the wiring board in FIG. 12; FIG. FIG. 2 is a wiring diagram showing a first specific example of wiring in the motor of the present disclosure; FIG. 4 is a diagram showing a first specific example of wire connections in the motor of the present disclosure; FIG. 5 is a diagram showing a second specific example of wire connections in the motor of the present disclosure; FIG. 4 is a diagram showing another example of a stator in the motor of the present disclosure;

Hereinafter, in order to describe the present disclosure in more detail, embodiments for carrying out the present disclosure will be described with reference to the accompanying drawings.

Embodiment 1.
FIG. 1 is a schematic cross-sectional view of a motor 1 according to the present disclosure.
FIG. 2 is a perspective view of a rotor 200 that constitutes the motor 1. FIG.
FIG. 1 schematically shows a cross section corresponding to the AA line cross section shown in FIG. 2 in the motor 1 with the stator 100 and the rotor 200 shown in FIG. 2 attached.
FIG. 2 shows a state in which the rotor 200 of FIG. 1 is taken out and viewed obliquely.

Motor 1 is a three-phase DC motor with brushes.
The motor 1 has a stator 100, a rotor 200, and brushes (not shown).
In this motor 1, a rotor 200 has a shaft 201 and is rotatably assembled to the stator 100 and the brushes with the shaft 201 as a central axis.

The stator 100 has a yoke 110 and magnets 120 .
A magnet 120 is a magnetic field source for the motor 1 and is composed of a permanent magnet or a ring magnet.
Yoke 110 is a magnetic body to which magnet 120 is attached.
The stator 100 also has a brush (not shown), a brush holder (not shown), and a power supply terminal (not shown).

The brushes have at least two brushes for conducting current to the rotor 200 , each contacting a different segment 260 for conducting current to the rotor 200 .
The brush holder is configured to hold the brush.
The power supply terminal has one end connected to a power source (not shown) and the other end electrically connected to the brush.
The magnets 120 shown in FIG. 1 are attached to the inner circumference of the yoke 110 and arranged alternately with different magnetic poles.
The motor 1 shown in FIG. 1 is a motor 1 having eight magnets 120 and eight poles (eight poles).

Rotor 200 comprises armature 205 , commutator 250 and shaft 201 . Armature 205 and commutator 250 are attached to shaft 201 .

Armature 205 has core 210 and coil 220 .
The core 210 is arranged in the magnetic field generated inside the yoke 110 by the magnet 120 and has a plurality of teeth 211 and a coil 220 wound around each tooth 211 .

Specifically, core 210 has teeth 211 with a substantially T-shaped cross section and slots that are gaps between teeth 211 and teeth 211 .
A plurality of teeth 211 are provided so as to radially extend from the center of shaft 201 when attached to shaft 201 . In the motor 1 shown in FIG. 1, six teeth 211 are provided, and the number of slots between adjacent teeth 211 is six.

The coil 220 is formed by winding a copper wire around each tooth 211 and inserting it into each slot.
Coil 220 has one end electrically connected to segment 260 of commutator 250 via terminal 240 .
The other end of the coil 220 is connected to another terminal 240, and is electrically connected to the connected terminal 240 and a switchboard 290, which will be described later.

The commutator 250 has a plurality of segments 260 arranged on a circumference centered on the shaft 201. In a state in which the plurality of segments 260 are divided into three phases, the segments 260 and the coils 220 of each phase are electrically connected. Connecting.
A method of connecting the coil 220 and the segment 260 includes, for example, a form as shown in Embodiment 2 or Embodiment 3 which will be described later.
Also, the commutator 250, for example, equalizes and electrically connects the same-phase segments 260 to each other.

3 to 13 in addition to FIGS. 1 and 2, the detailed configuration of rotor 200 will be described.
FIG. 3 is a diagram for explaining the configuration of the rotor 200. As shown in FIG.
FIG. 4 is a view of rotor 200 looking toward arrow B in FIG.
FIG. 5 is an enlarged view of the member 200a with the commutator 250 removed from the rotor 200 in FIG.
6 is a view of the member of FIG. 5 looking toward arrow C. FIG.
FIG. 7 is an enlarged view of the commutator 250 in FIG.
FIG. 8 is a view of the commutator 250 of FIG. 7 viewed toward arrow D. FIG.
FIG. 9 is an enlarged view of segment 260 in FIG.
FIG. 10 is an enlarged view of the wiring board 270 in FIG.
FIG. 11 is an enlarged view of the connection copper plate in FIG.
FIG. 12 is an enlarged view of the member 280 in which the segment 260 and the connection board 270 in FIG. 3 are assembled.
FIG. 13 is a diagram showing a connection state between the segment 260 and the wiring board 270 in FIG.

Rotor 200 has armature 205, commutator 250, and switchboard 290 assembled around shaft 201 so that shaft 201 is the center of rotation.

Armature 205 comprises core 210 and coil 220 held by insulating bobbin 230 .
Armature 205 also includes a plurality of terminals 240 .
The terminals 240 are composed of a terminal 240 to which one end of the coil 220 is connected and a terminal 240 to which the other end of the coil 220 is connected for each coil 220 .
Therefore, the number of terminals 240 is twice as many as the number of coils 220 . Twelve terminals 240 shown in FIGS. 5 and 6 are provided.
Terminal 240 shown in FIGS. 5 and 6 is arranged outside coil 220 with respect to shaft 201 and above core 210 .
Terminals 240 are electrically connected to other terminals 240 or segments 260 by switchboards 290 .

The commutator 250 is formed by integrally molding a member 280 with a segment 260 and a connection board 270 shown in FIG. 12 assembled with phenolic resin.
A plurality of segments 260 are evenly arranged on a circumference around shaft 201 . The segment 260 shown in FIG. 9 is 12 segments.
As shown in FIGS. 4, 7, 8, 9, and 13, the segment 260 includes connection terminals 261 (a first connection terminal 261a, a second connection terminal 261b, a third connection terminal 261a, and a third connection terminal 261b). 261c for connection, and hereinafter, when the first connection terminal 261a, the second connection terminal 261b, and the third connection terminal 261c are collectively described, they will be referred to as the connection terminal 261.), and the coil connection. It has a terminal 262 for
A connection terminal 261 is provided for each segment 260 . Specifically, for example, in the illustrated segment 260, three first connection terminals 261a are evenly arranged on the circumference around the shaft 201. As shown in FIG. Similarly, three second connection terminals 261b are evenly arranged on the circumference around the shaft 201 . Six third connection terminals 261c are evenly arranged on the circumference around the shaft 201, and are arranged between the first connection terminal 261a and the second connection terminal 261b. there is

The wiring terminal 261 is electrically connected to the terminal 240 of the armature 205 or a different wiring terminal 261 .
Specifically, the illustrated first wiring terminal 261a has an end portion folded back to form a U-shaped cross section, and the end portion is branched into three and arranged side by side. are coil connection terminals 262 .
The coil connection terminal 262 is electrically connected to the terminal 240 of the armature 205 .
The illustrated second wire connection terminal 261b has an end folded back to form a U-shaped cross section.
The illustrated third wire connection terminal 261c has an I-shaped cross-section without being folded back.
For example, the second wire connection terminal 261b and the third wire connection terminal 261c of the wire connection terminals 261 are arranged as shown in FIG. is welded to the leg portion 272 of the connection board 270 . The welded connection is for example resistance welding.

As shown in FIG. 10, the wiring board 270 has three wiring copper plates 271, which are integrally molded with phenolic resin.
The three connection copper plates 271 shown in FIG. 10 are a first annular copper plate 271a, a second annular copper plate 271b, and a third annular copper plate 271c.
Each of the first annular copper plate 271a, the second annular copper plate 271b, and the third annular copper plate 271c shown in FIG. The number of legs 272 is the same as the number of segments 260 minus the number of first connection terminals 261a ("9" in the illustrated configuration).
Feet 272 (first common mode connection leg 272 a , second common mode connection leg 272 b , third common mode connection leg 272 c ) extend from the annulus until they each contact a different segment 260 . .

Specifically, the first annular copper plate 271a has an annular portion with a first diameter smaller than the distance between the segments 260 facing each other about the shaft 201 .
The first annular copper plate 271a also has a plurality of first common-mode connection feet 272a.
The first common-mode connection leg portion 272a includes three terminals (that is, one second connection terminal 261b and two terminals) of the segments 260, excluding the first connection terminal 261a, from the annular portion. It extends until it contacts the third connection terminal 261c) and is welded to the contacting segment 260 .

The second annular copper plate 271b has an annular portion centered on the shaft 201 and having a second diameter smaller than the first diameter.
The second annular copper plate 271b also has a plurality of second common-mode connection feet 272b.
A second in-phase connecting leg 272b extends from the annulus until each contacts a different segment 260 and is welded to the contacted segment 260 . The connection point is the same rule as the first annular copper plate 271a, and three terminals of the contacting segment 260 (that is, one second connection terminal 261b and two third connection terminals 261c) and welding Connected.

The third annular copper plate 271c has a third diameter smaller than the second diameter around the shaft 201. The third annular copper plate 271c also has a plurality of third in-phase connection legs 272c.
A third in-phase connecting leg 272c extends from the annulus until each contacts a different segment 260 and is welded to the contacted segment 260 . The connection point is the same rule as the first annular copper plate 271a, and three terminals of the contacting segment 260 (that is, one second connection terminal 261b and two third connection terminals 261c) and welding Connected.
Reliability of connection can be improved by welding connection.

Since the first annular copper plate 271a, the second annular copper plate 271b, and the third annular copper plate 271c have different diameters, they can be superimposed in the vertical direction when the shaft 201 is used as the axis, and the size can be reduced.

The switchboard 290 electrically connects the terminals 240 described above.
Also, resistors, capacitors, or the like may be appropriately connected within the switchboard 290 . When connected in parallel with a resistor or capacitor coil, it has the effect of suppressing noise generated during motor operation.

Here, the connection of the entire rotor 200 including the connection on the connection board 270 and the connection on the switchboard 290 will be described.
FIG. 14 is a wiring diagram showing a first specific example of wire connection of the rotor 200 in the motor of the present disclosure.
A connection example is, for example, a form described in a second embodiment and a third embodiment which will be described later, and FIG. 14 shows a connection diagram in the example of the second embodiment (FIG. 15).
As described above, for example, three segments 260 (one second connection terminal 261b and two third connection terminals 261c) of the four segments 260 that are in-phase segments 260 are connected to the connection board 270. The remaining one segment 260 (one second connection terminal 261a) is connected to one second connection terminal 261b in the switchboard 290. form is conceivable.
In the switchboard 290, for example, between coil 1 and coil 2 (coil U1-U2, coil V1-V2, W1-W2), segment A1 and segment A3, through switchboard wiring 291 and switchboard element 292. , between segments B4 and B2, and between segments C3-C1.
However, it is not necessary to combine them as described above, and as long as they are connected by wiring as shown in FIG. 14 and FIG.
For example, the form of wiring distribution between segments is arbitrary, and all four segments may be connected by the wiring board 270 . In this case, the number of legs 272 of the connection board 270 is 12, and the number of welding points is 12.
Also, the electrical connection of each phase may be completed with the connection within the switchboard 290 , or may be completed between the commutator 250 and the wiring board 270 .

As a result, the above-described motor can facilitate wire connection between in-phase segments when the number of poles of the permanent magnets is increased without increasing the number of brushes in a motor with brushes.
Here, in a conventional motor, if a method of connecting segments with copper wires forming coils is adopted, the number of copper wires to be held in the hooks increases and the welding process becomes unstable.
Moreover, in the conventional motor, the resistance of the parallel circuit becomes unbalanced due to the method of routing the connecting wires, and the coil current also becomes unbalanced. As a result, the electromagnetic force acting on each tooth 211 becomes unbalanced, which causes vibration and noise.
On the other hand, the motor according to the present disclosure does not have the problems described above, and can realize a compact motor with easy wiring and good balance.

The motor in the present disclosure is a brushed motor with a plurality of magnets mounted at equal intervals along the yoke and alternately positioned at different magnetic poles, and magnets in the magnetic field generated inside the yoke by the magnets. A core having a plurality of teeth and a coil wound around the teeth and attached with the shaft as a central axis, and a plurality of segments arranged on a circumference centered on the shaft. a commutator that electrically connects the segments of each phase and the coil in a state in which the plurality of segments are divided into three phases, the commutator having a first commutator smaller than an interval between the segments facing each other about the shaft; a second annular copper plate centered about the shaft having a second diameter less than the first diameter; and a third diameter centered about the shaft less than the second diameter. A connection board having a third annular copper plate and legs extending from each annular copper plate until they contact different segments and are welded to the contacted segments.
As a result, when the number of poles of permanent magnets is increased without increasing the number of brushes in a motor with brushes, it is possible to provide a motor having a configuration in which the segments of the same phase are easily connected.

In the motor according to the present disclosure, the number of magnet poles is 8, the number of slots between adjacent teeth is 6, the number of segments is 12, and the foot of the wire connection board is , four of which are provided at equal intervals on each annular copper plate.
As a result, it is possible to provide an 8-pole, 6-slot, 12-segment motor in which the segments of the same phase are easily connected.

Embodiment 2.
Embodiment 2 describes a mode in which in-phase coils are connected in series in the motor according to the present disclosure. An example of a motor having 8 poles, 6 slots, and 12 segments will be described below.

Description will be made below using FIG. 15 in addition to FIG. 14 used in the first embodiment.
FIG. 15 is a diagram showing a first specific example of wire connections in the motor of the present disclosure.
When the plurality of coils are divided into three phases, each phase coil is connected in series between segments 260 of different phases when the plurality of segments 260 are divided into three phases.

Specifically, the magnet 120 has S poles, N poles, S poles, N poles, S poles, N poles, S poles, and so on so as to alternately have different magnetic poles on the circumference of the shaft 201 . They are evenly spaced in the order of N poles.
The brushes 600 are arranged in sets of + and - at intervals of 45 degrees. This is because the motor of this embodiment has an 8-pole configuration, which means that the spacing narrows as the number of poles increases. For example, the interval between the brushes 600 is 180 degrees for 2 poles, 90 degrees for 4 poles, and so on.

The segments 260 are arranged so that A, B, and C are repeated in the order of A, B, and C in a state in which 12 segments 260 are divided into three phases, A, B, and C, four each. In FIG. 15, the segments 260 are arranged in the order A1, B4, C3, A2, B1, C4, A3, B2, C1, A4, B3, C2. In the following description of the second embodiment, A, B, and C are used to denote segments.
The segments A1, A2, A3, and A4 are connected with pressure equalization by the connection board 270 described in the first embodiment.
The segments B1, B2, B3, and B4 are connected with pressure equalization by the connection board 270 described in the first embodiment.
The segments C1, C2, C3, and C4 are connected with pressure equalization by the connection board 270 described in the first embodiment.
The coils U1, V1, W1, U2, V2, and W2 are alternately arranged in a state in which six coils are divided into three phases of U, V, and W, two each. The coils shown in FIG. 15 are arranged in order of U1, V1, W1, U2, V2, and W2.
Segments A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, C4 and coils U1, V1, W1, U2, V2, W2 are segment A1-coil U1-coil U2-segment B4 - Coil V1 - Coil V2 - Segment C3 - Coil W1 - Coil W2 - Segment A1 are connected in this order, and each phase (in-phase) segment and each phase (in-phase) coil are connected in series.

As a result, when the number of turns per coil is N, the number of turns of the coils connected in series between segments of different phases is 2N, doubling the number of turns. As a result, the torque constant increases and the required current value decreases.

In the motor according to the present disclosure, furthermore, in a state in which the plurality of coils are divided into three phases, each phase coil is connected in series between segments of different phases in a state in which the plurality of segments are divided into three phases. configured to
This has the effect of providing a motor that requires less current.

Embodiment 3.
Embodiment 3 describes a mode in which in-phase coils are connected in parallel in the motor according to the present disclosure. An example of a motor having 8 poles, 6 slots, and 12 segments will be described below.
FIG. 16 is a diagram showing a second specific example of wire connections in the motor of the present disclosure.
When the plurality of coils are divided into three phases, each phase coil is connected in parallel between segments 260 of different phases when the plurality of segments 260 are divided into three phases.
Specifically, the magnet 120 has S poles, N poles, S poles, N poles, S poles, N poles, S poles, and so on so as to alternately have different magnetic poles on the circumference of the shaft 201 . They are evenly spaced in the order of N poles.
The brushes 600 are arranged in sets of + and - at intervals of 45 degrees. The reason for the 45-degree interval is 360 degrees/number of poles, as in the second embodiment.
The segments 260 are arranged so that A, B, and C are repeated in the order of A, B, and C in a state in which 12 segments 260 are divided into three phases, A, B, and C, four each. In FIG. 16, the segments 260 are arranged in the order A1, B1, C1, A2, B2, C2, A3, B3, C3, A4, B4, C4. In the following description of the third embodiment, A, B, and C are used to denote segments.

The segments A1, A2, A3, and A4 are connected with pressure equalization by the connection board 270 described in the first embodiment.
The segments B1, B2, B3, and B4 are connected with pressure equalization by the connection board 270 described in the first embodiment.
The segments C1, C2, C3, and C4 are connected with pressure equalization by the connection board 270 described in the first embodiment.
The coils are alternately arranged in a state in which six coils are divided into three phases such as U, V, and W by two. The coils shown in FIG. 14 are arranged in order of U1, V1, W1, U2, V2, and W2.

As shown in FIG. 16, segment A1 is connected to terminal U1+ of coil U1. In turn, terminal U1- of coil U1 is connected to segment B1 and terminal V1+ of coil V1. Terminal V1− of coil V1 is then connected to segment C1 and terminal W1+ of coil W1. In turn, terminal W1- of coil W1 is connected to segment A3 and terminal U2+ of coil U2. In turn, terminal U2- of coil U2 is connected to segment B3 and terminal V2+ of coil V2. Terminal V2- of coil V2 is then connected to segment C3 and terminal W2+ of coil W2. In turn, terminal W2- of coil W2 is connected to terminal U1+ of segment A1 and coil U1.

Thus, coil U1 and coil U2 are connected in parallel between segment A and segment B. FIG. Also, the coil V1 and the coil V2 are connected in parallel between the segment B and the segment C. As shown in FIG. In addition, the coil W1 and the coil W2 are connected in parallel between the segment C and the segment A.
That is, each phase coil is connected in parallel between different phase segments.

As a result, when the number of turns per coil is N, the number of turns of the coil connected in series between segments of different phases is N, which is half that of the series connection of the second embodiment. Therefore, the rotation speed can be increased.

In the operation control device according to the present disclosure, furthermore, in a state in which the plurality of coils are divided into three phases, each phase coil is connected in parallel between different phase segments in a state in which the plurality of segments are divided into three phases. , configured as
As a result, it is possible to provide a motor with an increased number of revolutions.

Here, although the structure of the stator 100 shown in FIG. 1 has been described in Embodiments 1, 2, and 3, an example of another structure will be described.
FIG. 17 is a diagram showing another example of the stator 100A in the motor 1A of the present disclosure.
In the motor 1A, the structure of the stator 100A is different from that of the stator 100 of FIG. 1, so the stator 100A will be mainly described.
100 A of stators arrange|position the magnet 120 inside the yoke 110A.
With this configuration, compared to the configuration in which the magnet 120 is arranged on the surface of the yoke 110A, even if the magnet 120 is cracked or chipped, it will not be caught in the gap between the stator 100A and the rotor 200. 100A and the rotor 200 do not lock, and the reliability of the motor can be improved.

Furthermore, a neodymium magnet having strong magnetic force is adopted as the magnet 120 .
Thereby, the magnet 120 can be made smaller.
Furthermore, by adopting it in an 8-pole, 6-slot motor as shown in FIG. 17, the magnetic flux generated from one permanent magnet can be reduced compared to the case of 4-pole, 6-slot motor, and the thickness of the core back can be reduced. , an increase in the size of the brush motor or a decrease in the output torque can be suppressed.

It should be noted that the present disclosure allows free combination of each embodiment, modification of any component of each embodiment, or omission of any component of each embodiment within the scope of the invention. .

1,1A motor, 100,100A stator, 110,110A yoke, 120 magnet, 200 rotor, 200a member from which the commutator is removed from the rotor, 201 shaft, 205 armature, 210 core, 211 tooth, 220 coil, 230 insulating bobbin, 240 terminal, 250 commutator, 260 segment, 261 connection terminal, 261a first connection terminal, 261b second connection terminal, 261c third connection terminal, 262 coil connection terminal, 270 connection Board 271 Connection copper plate 271a First annular copper plate 271b Second annular copper plate 271c Third annular copper plate 272 Foot 272a First in-phase connection foot 272b Second in-phase connection foot 272c 3rd leg for common-mode connection, 280 member assembled with segment and connection board, 290 switchboard, 291 wiring inside switchboard, 292 element inside switchboard.

Claims (4)

a plurality of magnets mounted at equal intervals along the yoke and alternately positioned at different magnetic poles;
a core disposed in the magnetic field generated inside the yoke by the magnet, having a plurality of teeth and a coil wound around the teeth, and attached around a shaft as a central axis;
a commutator having a plurality of segments arranged on a circumference centered on the shaft and electrically connecting the segments and coils of each phase in a state in which the plurality of segments are divided into three phases;
with
The commutator is
a first annular copper plate having a first diameter less than the spacing between the segments opposed about the shaft;
a second annular copper plate centered on the shaft and having a second diameter smaller than the first diameter;
a third annular copper plate centered on the shaft and having a third diameter smaller than the second diameter;
legs extending from each annular copper plate until each contact with a different segment and welded to the contacting segment;
with a wiring board having
brushed motor. The magnet has eight poles,
The slots between the adjacent teeth are 6 slots,
the number of segments is 12 segments;
Four legs of the wiring board are provided at equal intervals on each annular copper plate,
2. The motor according to claim 1, characterized in that: 1 or claim 1, wherein the coils of each phase are connected in series between the segments of different phases in a state in which the plurality of coils are divided into three phases 2. The motor according to 2. 1 or claim 1, wherein the plurality of coils are divided into three phases, and the coils of each phase are connected in parallel between the segments of different phases in the state of dividing the plurality of segments into three phases. 2. The motor according to 2.

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