JP7074557B2 - Electric motor - Google Patents

Description

The present invention relates to an electric motor.

Among the motors, there is a brushed three-phase DC motor (hereinafter referred to as a brushed motor) mounted on a vehicle or the like. The brushed motor comprises a cylindrical yoke with a permanent magnet attached to its inner peripheral surface and an armature rotatably provided inside the yoke radially.
The armature has a rotation shaft, an armature core externally fixed to the rotation shaft, and a commutator externally fixed to the rotation shaft so as to be adjacent to the armature core.

The armature core extends radially and has multiple teeth arranged radially. A dovetail groove-shaped slot is formed between the teeth adjacent to each other in the circumferential direction. A coil is wound around each tooth through these slots.
A plurality of segments are arranged along the circumferential direction in the commitator. A coil is connected to these segments. In addition, a brush is slidably contacted with each segment. The brush is electrically connected to an external power source. Then, the electric power of the external power source is applied to each segment through the brush, so that a current is supplied to each coil.

As a result, a predetermined magnetic field is formed in the armature core, and a magnetic attraction force or a repulsive force is generated between the magnetic field and the permanent magnet. Therefore, the armature rotates.
Further, by rotating the armature, the segment with which the brush is in sliding contact is sequentially changed, and the direction of the current supplied to the coil is switched, so-called rectification is performed. This causes the armature to rotate continuously.

By the way, as a means for reducing the size and weight of the motor, it is conceivable to increase the number of permanent magnets. By increasing the number of poles, it is possible to reduce the amount of effective magnetic flux per pole of the magnetic pole. As a result, it is possible to reduce the size and weight of the armature core that forms magnetism.
Here, if the number of slots is simply increased, the number of slots will increase, and if the outer diameter of the armature core is kept constant, the slots will become smaller. As a result, the coil winding work becomes difficult. Therefore, various techniques have been proposed that can reduce the size of the motor while facilitating the coil winding work.

For example, when the coil has 6 teeth and 12 segments, the teeth are numbered in order from 1 to 6 in the circumferential direction, and the segments are numbered in order from 1 to 12 in the circumferential direction, the coil is , The winding start end is connected to the 7th segment, connected from the 7th segment to the 1st segment, wound forward from the 1st segment to the 1st tooth, connected to the 1st tooth to the 2nd segment, 2 The 9th segment is connected to the 8th segment, the 8th segment is wound in the opposite direction to the 3rd tooth, the 3rd tooth is connected to the 3rd segment, the 3rd segment is connected to the 9th segment, and the 9th segment is connected. Is wound forward from the 5th tooth, connected to the 10th segment from the 5th tooth, connected to the 4th segment from the 10th segment, and wound in the reverse direction from the 4th segment to the 1st tooth, 1 It is connected from the number 11 to the 11th segment, connected from the 11th segment to the 5th segment, wound forward from the 5th segment to the 3rd tooth, connected to the 3rd tooth to the 6th segment, and the 6th segment. In some cases, the coil is connected to the 12th segment, wound in the opposite direction from the 12th segment to the 5th tooth, and the winding end end drawn from the 5th tooth is connected to the 7th segment again. The segments having the same potential are short-circuited by pressure equalizing lines (connecting lines). With such a configuration, the number of flyers used for forming the coils is increased to two, and a so-called double flyer method of forming two coils at a time can be adopted. Therefore, the man-hours for winding the coil can be reduced (see, for example, Patent Document 1).

Also, for example, each tooth is electrically connected between segments adjacent to each other and wound in the forward direction, and the first coil is electrically connected between other segments adjacent to each other and wound in the opposite direction. Some are equipped with a second coil. Then, the relative position between the segment to which the winding start end of the first coil is connected and the segment to which the winding start end of the second coil is connected is set so as to correspond to the relative position between the pair of brushes. ing. The segments having the same potential are short-circuited by pressure equalizing lines (connecting lines) (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2017-131035 Japanese Unexamined Patent Publication No. 2008-11485

By the way, even if the coil has the same wire diameter, there is often a slight difference in wire diameter due to a manufacturing error. Therefore, as in Patent Document 1 described above, when the coil is formed by the double flyer method, even if the number of turns of the coil wound around each tooth is the same, the portion wound by different coils is used. The weight could be different. As a result, the weight balance of the armature may deteriorate.

Further, in the above-mentioned Patent Document 2, there is a segment to which the coil wound around the tooth is not connected. When the brush is slidably contacted with such a segment, the current value flowing through the pressure equalizing line becomes large, and the pressure equalizing line may be damaged.

A more specific description will be given with reference to FIG.
FIG. 8 is an explanatory diagram showing an electric circuit of the coil 207 in Patent Document 2.
As shown in FIG. 8, for example, when the brush 222 is slidably contacted with the first segment 214 and the fourth segment 14, the coil 207 is connected to the first segment 214 via the pressure equalizing wire 252. The electric circuit is connected in parallel between the 7th segment 214, the 4th segment 214, and the 1st segment 214 connected via the pressure equalizing wire 252.

Therefore, for example, when the current value of the current supplied to the brush 222 is 4 [i], the current value of the current supplied to the coil 207 is 2 [i], but the 1st-7th segments 214. The current value of the current supplied to the pressure equalizing line 252 between them is 4 [i]. Similarly, the current value of the current supplied to the pressure equalizing wire 252 between the 4th-1st segments 214 is also 4 [i].
In this way, the value of the current flowing through the pressure equalizing wire 252 becomes large, and the pressure equalizing wire 252 may be damaged.

Therefore, the present invention can prevent the weight balance of the armature from deteriorating even if the double flyer method is adopted in order to facilitate the coil winding work, and reduce the current value flowing through the pressure equalizing wire. It provides an electric motor that can be used.

In order to solve the above problems, the electric motor according to the present invention has a yoke having a cylinder portion, a 4-pole permanent magnet provided on the inner peripheral surface of the cylinder portion, and a radial inside of the cylinder portion. It has a rotating shaft that is rotatably provided, six teeth that are attached to the rotating shaft and extend radially outward, and six slots that are formed between the teeth adjacent to each other in the circumferential direction. An armature core, a coil wound around each of the teeth by a centralized winding method, a commutator provided adjacent to the armature core on the rotation axis and arranging 12 segments in the circumferential direction, and each of the segments. When a plurality of brushes for supplying power to the coil are provided, N and A are integers of 0 or more, and α is set to satisfy α = 0.5A, the coil rotates. A first small coil formed by N / 2 + α turns and a second small coil formed by N / 2-α turns around the two teeth existing at positions facing each other with respect to the axis. A first coil in which a coil is arranged separately in the teeth, and a third small coil formed by winding N / 2 + α turns around the two teeth in which the first coil is formed. It consists of a fourth small coil formed by N / 2-α winding and a second coil in which the fourth small coil is arranged separately in the teeth, and in one of the two teeth, the tooth is used. The first small coil and the fourth small coil are arranged, and the second small coil and the third small coil are arranged in the other of the two teeth, and the third small coil is arranged in each of the segments. Is connected to the coil and the pressure equalizing wire connecting the predetermined segments , the teeth are numbered in order from 1 to 6 in the circumferential direction, and the segments are numbered 1 in the circumferential direction. When numbered in order from to 12, the first coil is connected to the first segment after the winding start end is connected to the seventh segment, is drawn in one direction in the rotation direction of the rotation axis, and then is connected to the first segment. The No. 1 segment is wound in one direction and then wound forward to the No. 1 tooth, and the No. 1 tooth is wound in the other direction opposite to the one direction and then the No. 4 tooth. It is wound in the forward direction, routed from the 4th tooth in the other direction, and then connected to the 2nd segment, and then routed from the 2nd segment in the same direction, and then connected to the 8th segment. Route in the above one direction from the number segment After being wound, it is wound around the No. 3 tooth in the opposite direction to the forward direction, drawn from the No. 3 tooth in the one direction, and then wound around the No. 6 tooth in the opposite direction, and then the No. 6 tooth. After being routed in one direction and then connected to the third segment, routed from the third segment in the one direction and then connected to the ninth segment, and then routed from the ninth segment in the one direction. After being wound in the forward direction by the 5th tooth, wound in the other direction from the 5th tooth, wound in the forward direction by the 2nd tooth, and wound in the one direction from the 2nd tooth. It is connected to the 10th segment, routed from the 10th segment in the one direction, then connected to the 4th segment, routed from the 4th segment in the one direction, and then wound around the 1st tooth in the opposite direction. Then, it is wound in the opposite direction from the 1st tooth to the 4th tooth, wound in the opposite direction from the 1st tooth, and then connected to the 11th segment after being drawn in the 1st direction from the 4th tooth, and is connected to the 11th segment. After being routed in one direction, it is connected to the 5th segment, and after being routed in the 1st direction from the 5th segment, it is wound around the 3rd tooth in the forward direction and from the 3rd tooth in the other direction. After being routed, it is wound around the 6th tooth in the forward direction, is routed from the 6th tooth in the other direction, is connected to the 6th segment, and is routed from the 6th segment in the same direction. It is connected to the 12th segment, is wound in the one direction from the 12th segment, is wound in the opposite direction to the 5th tooth, is wound in the same direction from the 5th tooth, and then is wound in the 2nd tooth. The coil, which is wound in the opposite direction, is drawn from the No. 2 tooth in the one direction, is connected to the No. 7 segment, and is wound around either the No. 1 tooth or the No. 4 tooth, is the first small coil. The coil is the coil, the coil wound around the other is the second small coil, and the coil wound around either the second tooth or the fifth tooth is the first small coil, and the other is The wound coil is the second small coil, the coil wound around one of the third and sixth teeth is the first small coil, and the coil wound around the other. Is the second small coil, and the second coil is arranged point-symmetrically about the first coil and the rotation axis, and is wound around either the first tooth or the fourth tooth. The coil is the third small coil, the coil wound around the one is the fourth small coil, and the coil wound around the other of the second and fifth teeth is the first coil. The third small coil, the coil wound around the one is the fourth small coil, and the coil wound around the other of the third and sixth teeth is the third small coil. It is characterized in that the coil wound around the one side is the fourth small coil .

With this configuration, even when a coil is wound around each tooth using the double flyer method, two separate coils are arranged for each tooth. Therefore, even if the double flyer method is adopted, it is possible to prevent the weight balance of the armature from deteriorating.
Further, a coil wound around the teeth can be connected to each segment. Therefore, it is possible to prevent the current value flowing through the pressure equalizing wire connecting the segments having the same potential from becoming large, and it is possible to prevent the pressure equalizing wire from being damaged.

The electric motor according to the present invention includes a yoke having a tubular portion, a four-pole permanent magnet provided on the inner peripheral surface of the tubular portion, and a rotating shaft rotatably provided inside the tubular portion in the radial direction. An armature core attached to the axis of rotation and having six teeth radially outwardly extending and six slots formed between each of the circumferentially adjacent teeth, and to each of the teeth. A coil wound by a centralized winding method, a commutator provided adjacent to the armature core on the rotating shaft and arranging 12 segments in the circumferential direction, and feeding power to the coil via each of the segments. When a plurality of brushes are provided, N and A are integers of 0 or more, and α is set so as to satisfy α = 0.5A, the coils are located at positions facing each other with respect to the rotation axis. The first small coil formed by N / 2 + α winding and the second small coil formed by N / 2-α winding are separately formed on the two existing teeth. A first coil arranged in the above, a third small coil formed by N / 2 + α winding around the two teeth on which the first coil is formed, and an N / 2-α rotation. The fourth small coil is formed by arranging the first small coil and the second coil separately on the teeth, and the first small coil and the first small coil are placed on one of the two teeth. Four small coils are arranged, and the second small coil and the third small coil are arranged on the other of the two teeth, and the coil and the predetermined said are arranged in each of the segments. When the pressure equalizing wire connecting the segments is connected and the teeth are numbered in order from 1 to 6 in the circumferential direction and the segments are numbered in order from 1 to 12 in the circumferential direction. , The winding start end of the first coil is connected to the 7th segment, is drawn in one direction of the rotation direction of the rotation axis, and then is connected to the 1st segment, from the 1st segment to the 1st direction. Is wound in the opposite direction in the opposite direction and then wound in the forward direction by the No. 1 tooth, and then wound in the other direction from the No. 1 tooth and then wound in the forward direction by the No. 4 tooth. The 4th tooth is routed in the other direction and then connected to the 2nd segment, the 2nd segment is routed in the 1st direction and then connected to the 8th segment, and the 8th segment is routed in the 1st direction. After being done, the 3rd teeth mentioned above It is wound in the opposite direction to the forward direction, wound in the one direction from the third tooth, then wound in the opposite direction to the sixth tooth, and wound in the one direction from the sixth tooth. Then connected to the 3rd segment, routed from the 3rd segment in the one direction, then connected to the 9th segment, routed from the 9th segment in the other direction, and then routed to the 5th tooth in the forward direction. It is wound, wound from the 5th tooth in the other direction, then wound around the 2nd tooth in the forward direction, wound from the 2nd tooth in the other direction, and then connected to the 10th segment. After being routed in the one direction from the No. segment, it is connected to the No. 4 segment, and after being routed in the one direction from the No. 4 segment, it is wound around the No. 1 tooth in the opposite direction. After being routed in a direction, it is wound around the 4th tooth in the opposite direction, is routed from the 4th tooth in the same direction, is connected to the 11th segment, and is routed from the 11th segment in the one direction. Then it is connected to the 5th segment, wound from the 5th segment in the other direction, then wound around the 3rd tooth in the forward direction, and then drawn from the 3rd tooth in the other direction, and then the 6th tooth. It is wound in the forward direction, routed from the 6th tooth in the other direction, and then connected to the 6th segment, and then routed from the 6th segment in the same direction, and then connected to the 12th segment. After being wound in the one direction from the No. segment, it is wound in the opposite direction to the No. 5 tooth, and after being wound in the one direction from the No. 5 tooth, it is wound in the opposite direction by the No. 2 tooth. The coil that is drawn from the No. 1 tooth in one direction, connected to the No. 7 segment, and wound around either the No. 1 tooth or the No. 4 tooth is the first small coil, and is wound around the other. The coil is the second small coil, the coil wound around one of the second and fifth teeth is the first small coil, and the coil wound around the other is the first coil. The second small coil, the coil wound around either the third or sixth tooth is the first small coil, and the coil wound around the other is the second small coil. The second coil is arranged point-symmetrically about the first coil and the rotation axis, and the coil wound around either the first tooth or the fourth tooth is the third small coil. a The coil wound around the one is the fourth small coil, and the coil wound around the other of the second and fifth teeth is the third small coil, and the one is the same. The coil wound around the fourth small coil is the fourth small coil, and the coil wound around the other of the third and sixth teeth is the third small coil and is wound around the one. The coil is the fourth small coil .

With this configuration, the ratio of the two separate coils arranged in each tooth can be made almost the same. Therefore, even if the double flyer method is adopted, it is possible to more reliably prevent the weight balance of the armature from deteriorating.

According to the present invention, even when a coil is wound around each tooth by using the double flyer method, two separate coils are arranged on each tooth. Therefore, even if the double flyer method is adopted, it is possible to prevent the weight balance of the armature from deteriorating.
Further, a coil wound around the teeth can be connected to each segment. Therefore, it is possible to prevent the current value flowing through the pressure equalizing wire connecting the segments having the same potential from becoming large, and it is possible to prevent the pressure equalizing wire from being damaged.

It is sectional drawing along the axial direction of the brushed motor in embodiment of this invention. It is a figure which developed the permanent magnet, the tooth, the segment, and the coil in the 1st Embodiment of this invention, and shows the winding state of one coil. It is a figure which developed the permanent magnet, the tooth, the segment, and the coil in the embodiment of this invention in 1st Embodiment of this invention, and shows the winding state of the other coil. It is explanatory drawing of arrangement of each coil with respect to the armature core in 1st Embodiment of this invention. It is explanatory drawing which shows the electric circuit of the coil in 1st Embodiment of this invention. It is a figure which developed the permanent magnet, the tooth, the segment, and the coil in the 2nd Embodiment of this invention, and shows the winding state of one coil. It is a figure which developed the permanent magnet, the tooth, the segment, and the coil in the embodiment of the present invention in the 2nd Embodiment of this invention, and shows the winding state of the other coil. It is explanatory drawing which shows the electric circuit of a conventional coil.

Next, an embodiment of the present invention will be described with reference to the drawings.

(Motor with brush)
FIG. 1 is a cross-sectional view taken along the axial direction of the brushed motor 1.
The brushed motor 1 is used, for example, as a drive source for electrical components mounted on a vehicle.
As shown in FIG. 1, the brushed motor 1 includes an armature 3 rotatably provided in a substantially bottomed cylindrical yoke 2, and the opening 2c of the yoke 2 is closed by an end bracket 17. In the following description, the rotation axis direction of the armature 3 is simply referred to as an axial direction, the rotation direction of the armature 3 is referred to as a circumferential direction, and the radial direction of the armature 3 orthogonal to the axial direction and the circumferential direction is simply referred to as a radial direction. ..

Four permanent magnets 4 are fixed in the circumferential direction on the inner peripheral surface of the yoke 2. That is, it has four magnetic poles.
The armature 3 is composed of an armature core 6 fixed to a rotating shaft 5, a coil 7 wound around the armature core 6, and a commutator 13 arranged on one end side of the armature core 6. The armature core 6 is, for example, a stack of a plurality of ring-shaped metal plates 8 in the axial direction. However, the armature core 6 may be formed by pressure molding soft magnetic powder.

Six T-shaped teeth 50 are formed on the outer peripheral portion of the metal plate 8 so as to project outward in the radial direction when viewed from the axial direction. The teeth 50 are arranged at equal intervals along the circumferential direction. By fitting a plurality of metal plates 8 onto the rotating shaft 5, a dovetail groove-shaped slot 51 is formed between adjacent teeth 50 on the outer periphery of the armature core 6. The slots 51 extend along the axial direction, and six slots 51 are formed at equal intervals along the circumferential direction. Through these slots 51, the coil 7 is wound around the teeth 50 by a centralized winding method (details will be described later).

The commutator 13 is externally fitted and fixed to one end of the rotating shaft 5. Twelve segments 14 made of a conductive material are attached to the outer peripheral surface of the commutator 13. As described above, the brushed motor 1 of the present embodiment has four permanent magnets 4 (four poles), six slots 51 (six teeth 50), and twelve segments 14. It is a so-called 4-pole 6-slot 12-segment (double segment) motor.

The segments 14 are made of plate-shaped metal pieces that are long in the axial direction, and are fixed in parallel at equal intervals along the circumferential direction in a state of being insulated from each other. At the end of each segment 14 on the armature core 6 side, a riser 15 bent so as to be folded back toward the outer diameter side is integrally formed with the segment 14. A coil 7 wound around the teeth 50 is hung around the riser 15 and fixed by, for example, fusing. As a result, the segment 14 and the corresponding coil 7 are electrically connected.

Further, among the segments 14, the coils 7 are connected so as to short-circuit the two predetermined segments 14, that is, the two segments 14 having the same potential (see FIG. 2, details will be described later). ). The coil 7 that short-circuits two segments 14 having the same potential functions as a pressure equalizing wire (connecting wire) 52. These pressure equalizing wires 52 are also hung around the riser 15 of the predetermined segment 14 and fixed by, for example, fusing.

The other end side of the rotating shaft 5 is rotatably supported by a bearing 12 in a boss formed so as to project from the bottom portion 2b of the yoke 2. An end bracket 17 is provided at the end of the yoke 2 on the opening 2c side. A holder stay 20 is attached to the inside of the end bracket 17. On the holder stay 20, for example, a pair of brush holders 21 are formed at intervals of 90 ° in the circumferential direction. Each of the brush holders 21 is provided with brushes 22 urged via springs 23 so as to be able to appear and disappear.

Each brush 22 is electrically connected to an external power source via a pigtail 16. Each brush 22 is classified into a positive electrode brush and a negative electrode brush. Since the tips of these brushes 22 are urged by the spring 23, they are in sliding contact with the commutator 13, and power from the outside is supplied to the commutator 13 via the brush 22.

(First Embodiment)
(Coil winding method)
Next, a winding method of the coil 7 will be described with reference to FIGS. 2 and 3.
Here, as the winding device used for winding the coil 7 around each tooth 50 and each segment 14, two flyers (both the winding device and the flyer are not shown) for feeding the coil 7 are used. The winding device to have is used. That is, two separate coils are wound around each tooth 50 and each segment 14 by a double flyer method.
Therefore, in order to make the explanation easy to understand, in FIG. 2, the coil 7 unwound from the first flyer will be described among the two flyers. In FIG. 3, of the two flyers, the coil 7 unwound from the second flyer will be described.

2 and 3 are views in which the permanent magnet 4 and the teeth 50, the segment 14, and the coil 7 (pressure equalizing wire 52) of the armature 3 are developed, and the gap between the adjacent teeth 50 is in the slot 51. It is equivalent.
Here, as shown in FIGS. 2 and 3, the armature 3 has a three-phase (U-phase, V-phase, W-phase) structure, and each tooth 50 has a U-phase, V-phase, and W along the circumferential direction. They are assigned in the order of phases. In the following description, the phases and numbers assigned to the teeth 50 will be assigned in order, and the segments 14 will be numbered in order in the circumferential direction. In FIGS. 2 and 3, each segment 14 is numbered so that the first segment 14 is located in the vicinity of the U1 (1) tooth 50, but the present invention is not limited to this. The position of the first segment 14 can be arbitrarily set.

First, the coil 7 unwound from the first flyer will be described with reference to FIG.
As shown in FIG. 2, the coil 7 is connected by the winding start end 7a being hung around the riser 15 of the 7th segment 14. Subsequently, the coil 7 is routed in one direction of rotation of the armature 3 (rotational shaft 5) (right direction in FIG. 2, simply referred to as one direction in the following description). After that, the coil 7 is hung around the riser 15 of the first segment 14 and connected to form a pressure equalizing wire 52 between the seventh and first segments 14.
Subsequently, the coil 7 is wound in one direction from the first segment 14 and then wound in the forward direction (clockwise in FIG. 2) around the U1 (1) teeth 50 in the first U phase order. The coil 171Ua is formed.

Subsequently, the coil 7 is in a direction opposite to one direction from the U1 (1) tooth 50 (the other direction of rotation of the armature 3 (rotation axis 5), the left direction in FIG. 2, and simply referred to as the other direction in the following description). Be drawn around. After that, the coil 7 is wound forward around the U2 (4) number teeth 50 to form the second U phase forward coil 172Ua.
Subsequently, the coil 7 is routed in the other direction from the U2 (4) tooth 50. After that, the coil 7 is hung around the riser 15 of the second segment 14 and connected.
Subsequently, the coil 7 is routed in one direction from the second segment 14. After that, the coil 7 is hung and connected to the riser 15 of the 8th segment 14 to form a pressure equalizing wire 52 between the 2nd and 8th segments 14.

Subsequently, the coil 7 is routed in one direction from the 8th segment 14. After that, the coil 7 is wound around the W1 (3) tooth 50 in a direction opposite to the forward direction (counterclockwise direction in FIG. 2) to form a first W reciprocal coil 171Wb.
Subsequently, the coil 7 is routed in one direction from the W1 (3) number teeth 50. After that, the coil 7 is wound around the W2 (6) tooth 50 in the opposite direction to form the second W phase-reverse coil 172Wb.

Subsequently, the coil 7 is routed in one direction from the W2 (6) number teeth 50. After that, the coil 7 is hung around the riser 15 of the third segment 14 and connected.
Subsequently, the coil 7 is routed in one direction from the third segment 14. After that, the coil 7 is hung and connected to the riser 15 of the 9th segment 14 to form a pressure equalizing wire 52 between the 3rd and 9th segments 14.

Subsequently, the coil 7 is routed in one direction from the 9th segment 14. After that, the coil 7 is wound forward around the V2 (5) tooth 50 to form a second V-phase forward coil 172Va.
Subsequently, the coil 7 is routed in the other direction from the V2 (5) tooth 50. After that, the coil 7 is wound forward around the V1 (2) number teeth 50 to form the first V phase forward coil 171Va.

Subsequently, the coil 7 is routed in one direction from the V1 (2) number teeth 50. After that, the coil 7 is hung around the riser 15 of the 10th segment 14 and connected.
Subsequently, the coil 7 is routed in one direction from the 10th segment 14. After that, the coil 7 is hung around the riser 15 of the 4th segment 14 and connected to form a pressure equalizing wire 52 between the 10th and 4th segments 14.
Subsequently, the coil 7 is routed in one direction from the fourth segment 14. After that, the coil 7 is wound around the U1 (1) tooth 50 in the opposite direction to form the first U phase reverse coil 171Ub.

Subsequently, the coil 7 is routed in one direction from the U1 (1) number teeth 50. After that, the coil 7 is wound around the U2 (4) tooth 50 in the opposite direction to form the second U phase reverse coil 172Ub.
Subsequently, the coil 7 is routed in one direction from the U2 (4) tooth 50. After that, the coil 7 is hung around the riser 15 of the 11th segment 14 and connected.
Subsequently, the coil 7 is routed in one direction from the 11th segment 14. After that, the coil 7 is hung and connected to the riser 15 of the 5th segment 14 to form a pressure equalizing wire 52 between the 11th and 5th segments 14.

Subsequently, the coil 7 is routed in one direction from the fifth segment 14. After that, the coil 7 is wound forward around the W1 (3) number teeth 50 to form the first W phase forward coil 171 Wa.
Subsequently, the coil 7 is routed in the other direction from the W1 (3) number teeth 50. After that, it is wound forward around the W2 (6) number teeth 50 to form the second W phase forward coil 172Wa.
Subsequently, the coil 7 is routed in the other direction from the W2 (6) number teeth 50. After that, the coil 7 is hung around the riser 15 of the sixth segment 14 and connected.

Subsequently, the coil 7 is routed in one direction from the sixth segment 14. After that, the coil 7 is hung and connected to the riser 15 of the 12th segment 14 to form a pressure equalizing wire 52 between the 6th and 12th segments 14.
Subsequently, the coil 7 is routed in one direction from the 12th segment 14. After that, it is wound around the V2 (5) tooth 50 in the opposite direction to form the second V-phase reverse coil 172Vb.
Subsequently, the coil 7 is routed in one direction from the V2 (5) tooth 50. After that, the coil 7 is wound around the V1 (2) tooth 50 in the opposite direction to form the first V-phase reverse coil 171Vb.

Subsequently, the coil 7 is routed in one direction from the V1 (2) number teeth 50. After that, the coil 7 is connected by the winding end end 7b being hung around the riser 15 of the 7th segment 14. As a result, the winding work of the coil 7 unwound from the first flyer is completed.

Next, the coil 7 unwound from the second flyer will be described with reference to FIG.
Here, the second flyer operates point-symmetrically with respect to the first flyer about the rotation axis 5. That is, as shown in FIG. 3, the coil 7 of the second flyer is formed point-symmetrically with respect to the coil 7 of the first flyer (see FIG. 2) about the rotation axis 5. Therefore, the description of the specific routing of the coil 7 of the second flyer will be omitted.

The coil 7 of the second flyer forms the first U phase forward coil 271Ua and the first U phase reverse coil 271Ub on the U1 (1) number tooth 50. Further, the coil 7 of the second flyer forms the first V phase forward coil 271Va and the first V phase reverse coil 271Vb on the V1 (2) tooth 50. Further, the coil 7 of the second flyer forms the first W phase forward coil 271Wa and the first W phase reverse coil 271Wb on the W1 (3) tooth 50.

Further, the coil 7 of the second flyer forms the second U phase forward coil 272Ua and the second U phase reverse coil 272Ub on the U2 (4) tooth 50. Further, the coil 7 of the second flyer forms the second V phase forward coil 272Va and the second V phase reverse coil 272Vb on the V2 (5) tooth 50. Further, the coil 7 of the second flyer forms the second W phase forward coil 272Wa and the second W phase reverse coil 272Wb on the W2 (6) tooth 50.
As described above, each tooth 50 has a total of four coils, two phase coils 171Ua to 172Wb formed by the first flyer and two phase coils 271Ua to 272Wb formed by the second flyer. Phase coils 171Ua to 272Wb are formed.

Here, the relationship between each of the four phase coils 171Ua to 272Wb formed in each tooth 50 will be described with reference to FIGS. 2 to 4.
FIG. 4 is an explanatory diagram of the arrangement of each phase coil 171Ua to 272Wb with respect to the armature core 6. In FIG. 4, the armature core 6 is viewed from the axial direction.

First, of the phase coils 171Ua to 172Wb formed on each tooth 50 by the first flyer, the phase coils 171Ua to 172Wb formed on two in-phase teeth 50 existing at positions facing each other with respect to the rotation axis 5 as the center. Is the first coil 71. Further, of the two teeth 50 on which the first coil 71 is formed, the two phase coils 171Ua to 172Wb formed on one of the teeth 50 are set as the first small coils 71U to 71W, and are formed on the other teeth 50. The two phase coils 171Ua to 172Wb are the second small coils 72U to 72W.

In the first embodiment, the first small coil 71U to 71W and the second small coil 72U to 72W are used in order from the U1 (1) number tooth 50. That is, the phase coils 171Ua to 171Wb formed in each of the U1 (1) No. Teeth 50, the V1 (2) No. Teeth 50, and the W1 (3) No. Teeth 50 are the first small coils 71U to 71W, respectively. .. Further, the U2 (4) teeth 50 and the V2 (5) teeth facing the U1 (1) teeth 50, the V1 (2) teeth 50, and the W1 (3) teeth 50 with the rotation axis 5 as the center, respectively. The phase coils 172Ua to 172Wb formed in each of the 50 and the W2 (6) tooth 50 are the second small coils 72U to 72W, respectively.

Next, among the phase coils 271Ua to 272Wb formed on the teeth 50 by the second flyer, the phase coils 271Ua to the phase coils 271Ua formed on the two in-phase teeth 50 existing at positions facing each other with respect to the rotation axis 5 as the center. Let 272Wb be the second coil 72. Further, of the two teeth 50 in which the second coil 72 is formed, the two phase coils 271Ua to 272Wb formed in one tooth 50 are set as the third small coils 73U to 73W, and are formed in the other tooth 50. The two phase coils 271Ua to 272Wb are used as the fourth small coil 74U to 74W.

Here, since the second flyer operates point-symmetrically with the first flyer, the order of the third small coil 73U to 73W and the fourth small coil 74U to 74W is centered on the rotation axis 5 with the first flyer. The opposite is true. That is, as the third small coil 73U to 73W and the fourth small coil 74U to 74W in order from the U2 (4) number tooth 50 existing at a position facing the U1 (1) number tooth 50 with respect to the rotation axis 5 as the center. There is. That is, the phase coils 272Ua to 272Wb formed in each of the U2 (4) tooth 50, the V2 (5) tooth 50, and the W2 (6) tooth 50 are the third small coils 73U to 73W, respectively. .. Further, the U1 (1) teeth 50 and the V1 (2) teeth facing the U2 (4) teeth 50, the V2 (5) teeth 50, and the W2 (6) teeth 50 with the rotation axis 5 as the center, respectively. The phase coils 271Ua to 271Wb formed in each of the 50 and the W1 (3) tooth 50 are the second small coils 72U to 72W, respectively.

As described above, the U1 (1) th tooth 50 is formed with the U-phase first small coil 71U and the fourth small coil 74U. A first small coil 71V and a fourth small coil 74V of the V phase are formed on the V1 (2) tooth 50. A first small coil 71W and a fourth small coil 74W of the W phase are formed on the W1 (3) tooth 50.
Further, the U2 (4) tooth 50, which exists at a position facing the U1 (1) tooth 50 with respect to the rotation axis 5, has a U-phase second small coil 72U and a third small coil 73U. It is formed. The second small coil 72V and the third small coil 73V of the V phase are formed on the V2 (5) tooth 50, which exists at a position facing the V1 (2) tooth 50 with respect to the rotation axis 5. ing. The second small coil 72W and the third small coil 73W of the W phase are formed on the W2 (6) number tooth 50, which exists at a position facing the W1 (3) number tooth 50 with respect to the rotation axis 5 as the center. ing.

(About the number of coil turns)
Next, the number of turns of each of the small coils 71 and 72 (first to fourth small coils 71U to 74W) will be described.
When N and A are integers of 0 or more and α is set to satisfy α = 0.5A,
The number of turns M1 of each of the first small coils 71U to 71W constituting the first coil 71 is different.
M1 = N / 2 + α ・ ・ ・ (1)
It is set to meet.
The number of turns M2 of each of the second small coils 72U to 72W constituting the first coil 71 is different.
M2 = N / 2-α ・ ・ ・ (2)
It is set to meet.

The number of turns M3 of each of the third small coils 73U to 73W constituting the second coil 72 is different.
M3 = N / 2 + α ・ ・ ・ (3)
It is set to meet.
The number of turns M4 of each of the fourth small coils 74U to 74W constituting the second coil 72 is different.
M4 = N / 2-α ・ ・ ・ (4)
It is set to meet.

Here, each of the small coils 71U to 74W is composed of two phase coils 171Ua to 272Wb, respectively. That is, the total number of turns of each of the two phase coils 171Ua to 272Wb may be M1 to M4, which satisfy the above equations (1) to (4).

(About the electric circuit of the coil)
Next, the electric circuit of the coil 7 wound as described above will be described with reference to FIG.
FIG. 5 is an explanatory diagram showing an electric circuit of the coil 7.
As shown in FIG. 5, for example, when the brush 22 is slidably contacted with the first segment 14 and the fourth segment 14, four parallel circuits 1H to 4H are formed between the brush 22. Therefore, for example, when the current value supplied to the brush 22 is 4 [i], the current value supplied to each circuit is 1 [i]. Further, the current value of the current supplied to the pressure equalizing wire 52 is also 1 [i].

As described above, in the above-mentioned first embodiment, in the brushed motor 1 having 4 poles and 6 slots and 12 segments (double segment), the corresponding phase coils 171Ua to 272Wb are wound around each tooth 50. Then, the turns M1 to M4 of each of the small coils 71U to 74W composed of these phase coils 171Ua to 272Wb are set so as to satisfy the above equations (1) to (4). Therefore, even when the coil 7 is wound around each tooth 50 by using the double flyer method, two separate coils 7 are arranged on each tooth 7. Therefore, even if the double flyer method is adopted, it is possible to prevent the weight balance of the armature 3 from being deteriorated.
Further, a coil 7 wound around the teeth 50 can be connected to each segment 14. Therefore, it is possible to prevent the current value flowing through the pressure equalizing wire 52 connecting the segments 14 having the same potential from becoming large, and it is possible to prevent the pressure equalizing wire 52 from being damaged.

(Second Embodiment)
Next, with reference to FIG. 1, a winding method of the coil 7 of the second embodiment will be described with reference to FIGS. 6 and 7. The same embodiments as those of the above-described first embodiment are designated by the same reference numerals and the description thereof will be omitted.
Here, in the second embodiment, the brushed motor 1 includes an armature 3 rotatably provided in a substantially bottomed cylindrical yoke 2, and the opening 2c of the yoke 2 is closed by an end bracket 17. A certain point is the same as the above-mentioned first embodiment. Further, in the second embodiment, as the winding device used for winding the coil 7 around each tooth 50 and each segment 14, neither the flyer (the winding device nor the flyer) for feeding the coil 7 is used. A winding device having two (illustrated) is used, and two separate coils are wound around each tooth 50 and each segment 14 by a double flyer method, which is the same as the first embodiment described above. ..
The difference between the first embodiment and the second embodiment is the winding method of the coil 7.

(Coil winding method)
FIG. 6 describes the coil 7 fed from the first flyer among the two flyers. In FIG. 7, of the two flyers, the coil 7 unwound from the second flyer will be described.
6 and 7 are views in which the permanent magnet 4 and the teeth 50, the segment 14, and the coil 7 (pressure equalizing wire 52) of the armature 3 are developed, and the gap between the adjacent teeth 50 is in the slot 51. It is equivalent.
Here, as shown in FIGS. 6 and 7, the armature 3 has a three-phase (U-phase, V-phase, W-phase) structure as in the first embodiment, and each tooth 50 is along the circumferential direction. It is assigned in the order of U phase, V phase, and W phase.

First, the coil 7 unwound from the first flyer will be described with reference to FIG.
As shown in FIG. 6, in the coil 7, the winding start end 7a is hung around the riser 15 of the 7th segment 14, and the coil 7 is drawn in one direction (right direction in FIG. 6). After that, the coil 7 is hung around the riser 15 of the first segment 14 and connected to form a pressure equalizing wire 52 between the seventh and first segments 14.
Subsequently, the coil 7 is routed from the first segment 14 toward the other direction (leftward in FIG. 6), and then wound in the forward direction (clockwise in FIG. 6) around the U1 (1) teeth 50. It is turned to form the first U phase forward coil 171Ua.

Subsequently, the coil 7 is routed in the other direction from the U1 (1) number teeth 50. After that, the coil 7 is wound forward around the U2 (4) number teeth 50 to form the second U phase forward coil 172Ua.
Subsequently, the coil 7 is routed in the other direction from the U2 (4) tooth 50. After that, the coil 7 is hung around the riser 15 of the second segment 14 and connected.
Subsequently, the coil 7 is routed in one direction from the second segment 14. After that, the coil 7 is hung and connected to the riser 15 of the 8th segment 14 to form a pressure equalizing wire 52 between the 2nd and 8th segments 14.

Subsequently, the coil 7 is routed in one direction from the 8th segment 14. After that, the coil 7 is wound around the W1 (3) tooth 50 in the opposite direction (counterclockwise direction in FIG. 6) to form the first W phase-reverse coil 171Wb.
Subsequently, the coil 7 is routed in one direction from the W1 (3) number teeth 50. After that, the coil 7 is wound around the W2 (6) tooth 50 in the opposite direction to form the second W phase-reverse coil 172Wb.

Subsequently, the coil 7 is routed in one direction from the W2 (6) number teeth 50. After that, the coil 7 is hung around the riser 15 of the third segment 14 and connected.
Subsequently, the coil 7 is routed in one direction from the third segment 14. After that, the coil 7 is hung and connected to the riser 15 of the 9th segment 14 to form a pressure equalizing wire 52 between the 3rd and 9th segments 14.

Subsequently, the coil 7 is routed from the 9th segment 14 in the other direction. After that, the coil 7 is wound forward around the V2 (5) tooth 50 to form a second V-phase forward coil 172Va.
Subsequently, the coil 7 is routed in the other direction from the V2 (5) tooth 50. After that, the coil 7 is wound forward around the V1 (2) number teeth 50 to form the first V phase forward coil 171Va.

Subsequently, the coil 7 is routed in the other direction from the V1 (2) number teeth 50. After that, the coil 7 is hung around the riser 15 of the 10th segment 14 and connected.
Subsequently, the coil 7 is routed in one direction from the 10th segment 14. After that, the coil 7 is hung around the riser 15 of the 4th segment 14 and connected to form a pressure equalizing wire 52 between the 10th and 4th segments 14.
Subsequently, the coil 7 is routed in one direction from the fourth segment 14. After that, the coil 7 is wound around the U1 (1) tooth 50 in the opposite direction to form the first U phase reverse coil 171Ub.

Subsequently, the coil 7 is routed in one direction from the U1 (1) number teeth 50. After that, the coil 7 is wound around the U2 (4) tooth 50 in the opposite direction to form the second U phase reverse coil 172Ub.
Subsequently, the coil 7 is routed in one direction from the U2 (4) tooth 50. After that, the coil 7 is hung around the riser 15 of the 11th segment 14 and connected.
Subsequently, the coil 7 is routed in one direction from the 11th segment 14. After that, the coil 7 is hung and connected to the riser 15 of the 5th segment 14 to form a pressure equalizing wire 52 between the 11th and 5th segments 14.

Subsequently, the coil 7 is routed from the fifth segment 14 in the other direction. After that, the coil 7 is wound forward around the W1 (3) number teeth 50 to form the first W phase forward coil 171 Wa.
Subsequently, the coil 7 is routed in the other direction from the W1 (3) number teeth 50. After that, it is wound forward around the W2 (6) number teeth 50 to form the second W phase forward coil 172Wa.
Subsequently, the coil 7 is routed in the other direction from the W2 (6) number teeth 50. After that, the coil 7 is hung around the riser 15 of the sixth segment 14 and connected.

Subsequently, the coil 7 is routed in one direction from the sixth segment 14. After that, the coil 7 is hung and connected to the riser 15 of the 12th segment 14 to form a pressure equalizing wire 52 between the 6th and 12th segments 14.
Subsequently, the coil 7 is routed in one direction from the 12th segment 14. After that, it is wound around the V2 (5) tooth 50 in the opposite direction to form the second V-phase reverse coil 172Vb.
Subsequently, the coil 7 is routed in one direction from the V2 (5) tooth 50. After that, the coil 7 is wound around the V1 (2) tooth 50 in the opposite direction to form the first V-phase reverse coil 171Vb.

Subsequently, the coil 7 is routed in one direction from the V1 (2) number teeth 50. After that, the coil 7 is connected by the winding end end 7b being hung around the riser 15 of the 7th segment 14. As a result, the winding work of the coil 7 unwound from the first flyer is completed.

Next, the coil 7 unwound from the second flyer will be described with reference to FIG. 7.
Here, the second flyer operates point-symmetrically with respect to the first flyer about the rotation axis 5. That is, as shown in FIG. 7, the coil 7 of the second flyer is formed point-symmetrically with respect to the coil 7 of the first flyer (see FIG. 6) about the rotation axis 5. Therefore, the description of the specific routing of the coil 7 of the second flyer will be omitted.

The coil 7 of the second flyer forms the first U phase forward coil 271Ua and the first U phase reverse coil 271Ub on the U1 (1) number tooth 50. Further, the coil 7 of the second flyer forms the first V phase forward coil 271Va and the first V phase reverse coil 271Vb on the V1 (2) tooth 50. Further, the coil 7 of the second flyer forms the first W phase forward coil 271Wa and the first W phase reverse coil 271Wb on the W1 (3) tooth 50.

Further, the coil 7 of the second flyer forms the second U phase forward coil 272Ua and the second U phase reverse coil 272Ub on the U2 (4) tooth 50. Further, the coil 7 of the second flyer forms the second V phase forward coil 272Va and the second V phase reverse coil 272Vb on the V2 (5) tooth 50. Further, the coil 7 of the second flyer forms the second W phase forward coil 272Wa and the second W phase reverse coil 272Wb on the W2 (6) tooth 50.
As described above, each tooth 50 has a total of four coils, two phase coils 171Ua to 172Wb formed by the first flyer and two phase coils 271Ua to 272Wb formed by the second flyer. Phase coils 171Ua to 272Wb are formed.

As described above, also in the above-mentioned second embodiment, as in the above-mentioned first embodiment, of the phase coils 171Ua to 172Wb formed on each tooth 50 by the first flyer, the rotation shaft 5 is the center. The phase coils 171Ua to 172Wb formed on the two in-phase teeth 50 existing at opposite positions serve as the first coil 71. Further, of the two teeth 50 on which the first coil 71 is formed, the two phase coils 171Ua to 172Wb formed on one of the teeth 50 become the first small coils 71U to 71W and are formed on the other teeth 50. The two phase coils 171Ua to 172Wb that are used become the second small coil 72U to 72W.

Further, also in the above-mentioned second embodiment, as in the above-mentioned first embodiment, the first small coil 71U to 71W and the second small coil 72U to 72W are in order from the U1 (1) number tooth 50. That is, the phase coils 171Ua to 171Wb formed in each of the U1 (1) No. Teeth 50, the V1 (2) No. Teeth 50, and the W1 (3) No. Teeth 50 become the first small coils 71U to 71W, respectively. .. Further, the U2 (4) teeth 50 and the V2 (5) teeth facing the U1 (1) teeth 50, the V1 (2) teeth 50, and the W1 (3) teeth 50 with the rotation axis 5 as the center, respectively. The phase coils 172Ua to 172Wb formed in each of the 50 and the W2 (6) number 50 are the second small coils 72U to 72W, respectively.

Further, among the phase coils 271Ua to 272Wb formed on the teeth 50 by the second flyer, the phase coils 271Ua to 272Wb formed on the two in-phase teeth 50 existing at positions facing each other with respect to the rotation axis 5 as the center. However, it becomes the second coil 72. Further, of the two teeth 50 on which the second coil 72 is formed, the two phase coils 271Ua to 272Wb formed on one of the teeth 50 become the third small coils 73U to 73W and are formed on the other teeth 50. The two phase coils 271Ua to 272Wb that are used become the fourth small coil 74U to 74W.

Therefore, according to the above-mentioned second embodiment, the same effect as that of the above-mentioned first embodiment can be obtained. Further, in addition to the first embodiment, it is possible to increase the variation of the winding method of the coil 7 as in the second embodiment.

The present invention is not limited to the above-described embodiment, and includes various modifications to the above-mentioned embodiment without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where the brushed motor 1 is used as a drive source for an electrical component (for example, a power window) mounted on a vehicle has been described. However, the present invention is not limited to this, and the brushed motor 1 can be adopted for driving various devices.

Further, in the above-described embodiment, the first small coil 71U to 71W and the second small coil 72U to 72W are used in order from the U1 (1) number tooth 50, and the rotation shaft 5 is used with the U1 (1) number tooth 50. The case where the third small coil 73U to 73W and the fourth small coil 74U to 74W are used in order from the U2 (4) number teeth 50 existing at the positions facing each other in the center has been described. However, the present invention is not limited to this, and the first small coil 71U to 71W and the second small coil 72U to 72W are used in order from the U2 (4) tooth 50, and the U1 (1) tooth 50 is used in this order. The 3 small coils 73U to 73W and the 4th small coils 74U to 74W may be used.

1 ... Brushed motor (motor), 2 ... York, 3 ... Armature, 4 ... Permanent magnet, 5 ... Rotating shaft, 6 ... Armature core, 7 ... Coil, 7a ... Winding start end, 7b ... Winding end end, 14 ... Segment, 22 ... Brush, 50 ... Teeth, 51 ... Slot, 52 ... Pressure equalizing wire, 71 ... 1st coil, 72 ... 2nd coil, 71U, 71V, 71W ... 1st small coil, 72U, 72V, 72W ... First 2 small coils, 73U, 73V, 73W ... 3rd small coil, 74U, 74V, 74W ... 4th small coil, 171Ua, 271Ua ... 1st U phase forward coil, 171Ub, 271Ub ... 1st U phase reverse coil, 171Va, 271Va ... 1st V phase forward coil, 171Vb, 271Vb ... 1st V phase reverse coil, 171Wa, 271Wa ... 1st W phase forward coil, 171Wb, 271Wb ... 1st W phase reverse coil, 172Ua, 272Ua ... 2nd U phase forward coil, 172Ub, 272Ub ... 2nd U phase reverse coil, 172Va, 272Va ... 2nd V phase forward coil, 172Vb, 272Vb ... 2nd V phase reverse coil, 172Wa, 272Wa ... 2nd W phase forward coil, 172Wb, 272Wb ... 2nd W phase reverse coil

Claims (2)

A yoke with a cylinder and
A 4-pole permanent magnet provided on the inner peripheral surface of the cylinder,
A rotating shaft rotatably provided inside the tubular portion in the radial direction,
An armature core attached to the axis of rotation and having six teeth radially outwardly extending and six slots formed between each of the circumferentially adjacent teeth.
A coil that is wound around each of the teeth by a centralized winding method,
A commutator provided on the rotation axis adjacent to the armature core and having 12 segments arranged in the circumferential direction,
A plurality of brushes, which feed the coil through each of the segments, are provided.
When N and A are integers of 0 or more and α is set to satisfy α = 0.5A,
The coil is
A first small coil formed by N / 2 + α turns and a first small coil formed by N / 2-α turns around the two teeth existing at positions facing each other with respect to the rotation axis. The first coil, which is formed by arranging two small coils in the teeth separately from each other,
A third small coil formed by N / 2 + α turns and a fourth small coil formed by N / 2-α turns around the two teeth on which the first coil is formed. A second coil, each of which is placed on the teeth separately.
Consists of
The first small coil and the fourth small coil are arranged on one of the two teeth.
The second small coil and the third small coil are arranged on the other of the two teeth.
A pressure equalizing wire connecting the coil and the predetermined segment is connected to each of the segments .
When the teeth are numbered in order from 1 to 6 in the circumferential direction and the segments are numbered in order from 1 to 12 in the circumferential direction.
The first coil is
The winding start end is connected to the 7th segment, is drawn in one direction of the rotation direction of the rotation axis, and then is connected to the 1st segment.
It is wound in one direction from the first segment and then wound in the forward direction to the first tooth.
It is wound from the 1st tooth in the other direction opposite to the one direction, and then wound around the 4th tooth in the forward direction.
It is routed from the 4th tooth in the other direction and then connected to the 2nd segment.
It is routed from the 2nd segment in the above direction and then connected to the 8th segment.
After being wound in the one direction from the 8th segment, it is wound around the 3rd tooth in the opposite direction to the forward direction.
It is wound in the same direction from the 3rd tooth and then wound in the opposite direction to the 6th tooth.
It is routed from the 6th tooth in the above direction and then connected to the 3rd segment.
It is routed from the 3rd segment in the above direction and then connected to the 9th segment.
After being routed in the one direction from the 9th segment, it is wound in the forward direction on the 5th tooth.
After being drawn from the 5th tooth in the other direction, it is wound around the 2nd tooth in the forward direction.
It is routed from the 2nd tooth in the above direction and then connected to the 10th segment.
It is routed from the 10th segment in the above direction and then connected to the 4th segment.
It is wound in the same direction from the 4th segment and then wound in the opposite direction to the 1st tooth.
It is wound from the 1st tooth in the same direction and then wound around the 4th tooth in the opposite direction.
It is routed from the 4th tooth in the above direction and then connected to the 11th segment.
It is routed from the 11th segment in the above direction and then connected to the 5th segment.
After being routed in the one direction from the 5th segment, it is wound in the forward direction on the 3rd tooth.
After being drawn from the 3rd tooth in the other direction, it is wound around the 6th tooth in the forward direction.
After being routed from the 6th tooth in the other direction, it is connected to the 6th segment.
It is routed from the 6th segment in the above direction and then connected to the 12th segment.
After being routed in the one direction from the 12th segment, it is wound in the opposite direction to the 5th tooth.
It is wound in the one direction from the 5th tooth and then wound in the opposite direction to the 2nd tooth.
It is routed from the 2nd tooth in the above direction and then connected to the 7th segment.
The coil wound around either the 1st tooth or the 4th tooth is the first small coil, and the coil wound around the other is the second small coil.
The coil wound around either the No. 2 tooth or the No. 5 tooth is the first small coil, and the coil wound around the other is the second small coil.
The coil wound around either the No. 3 tooth or the No. 6 tooth is the first small coil, and the coil wound around the other is the second small coil.
The second coil is arranged point-symmetrically about the first coil and the rotation axis.
The coil wound around the other of the No. 1 teeth and the No. 4 teeth is the third small coil, and the coil wound around the one is the fourth small coil.
The coil wound around the other of the 2nd and 5th teeth is the 3rd small coil, and the coil wound around the 1st coil is the 4th small coil.
The coil wound around the other of the 3rd and 6th teeth is the 3rd small coil, and the coil wound around the 1st coil is the 4th small coil. Electric motor. A yoke with a cylinder and
A 4-pole permanent magnet provided on the inner peripheral surface of the cylinder,
A rotating shaft rotatably provided inside the tubular portion in the radial direction,
An armature core attached to the axis of rotation and having six teeth radially outwardly extending and six slots formed between each of the circumferentially adjacent teeth.
A coil that is wound around each of the teeth by a centralized winding method,
A commutator provided on the rotation axis adjacent to the armature core and having 12 segments arranged in the circumferential direction,
A plurality of brushes, which feed the coil through each of the segments, are provided.
When N and A are integers of 0 or more and α is set to satisfy α = 0.5A,
The coil is
A first small coil formed by N / 2 + α turns and a first small coil formed by N / 2-α turns around the two teeth existing at positions facing each other with respect to the rotation axis. The first coil, which is formed by arranging two small coils in the teeth separately from each other,
A third small coil formed by N / 2 + α turns and a fourth small coil formed by N / 2-α turns around the two teeth on which the first coil is formed. A second coil, each of which is placed on the teeth separately.
Consists of
The first small coil and the fourth small coil are arranged on one of the two teeth.
The second small coil and the third small coil are arranged on the other of the two teeth.
A pressure equalizing wire connecting the coil and the predetermined segment is connected to each of the segments.
When the teeth are numbered in order from 1 to 6 in the circumferential direction and the segments are numbered in order from 1 to 12 in the circumferential direction.
The first coil is
The winding start end is connected to the 7th segment, is drawn in one direction of the rotation direction of the rotation axis, and then is connected to the 1st segment.
It is wound from the 1st segment in the other direction opposite to the one direction, and then wound forward to the 1st tooth.
After being drawn from the 1st tooth in the other direction, it is wound around the 4th tooth in the forward direction.
It is routed from the 4th tooth in the other direction and then connected to the 2nd segment.
It is routed from the 2nd segment in the above direction and then connected to the 8th segment.
After being wound in the one direction from the 8th segment, it is wound around the 3rd tooth in the opposite direction to the forward direction.
It is wound in the same direction from the 3rd tooth and then wound in the opposite direction to the 6th tooth.
It is routed from the 6th tooth in the above direction and then connected to the 3rd segment.
It is routed from the 3rd segment in the above direction and then connected to the 9th segment.
After being routed from the 9th segment in the other direction, it is wound around the 5th tooth in the forward direction.
After being drawn from the 5th tooth in the other direction, it is wound around the 2nd tooth in the forward direction.
After being routed from the 2nd tooth in the other direction, it is connected to the 10th segment.
It is routed from the 10th segment in the above direction and then connected to the 4th segment.
It is wound in the same direction from the 4th segment and then wound in the opposite direction to the 1st tooth.
It is wound from the 1st tooth in the same direction and then wound around the 4th tooth in the opposite direction.
It is routed from the 4th tooth in the above direction and then connected to the 11th segment.
It is routed from the 11th segment in the above direction and then connected to the 5th segment.
After being routed from the 5th segment in the other direction, it is wound around the 3rd tooth in the forward direction.
After being drawn from the 3rd tooth in the other direction, it is wound around the 6th tooth in the forward direction.
After being routed from the 6th tooth in the other direction, it is connected to the 6th segment.
It is routed from the 6th segment in the above direction and then connected to the 12th segment.
After being routed in the one direction from the 12th segment, it is wound in the opposite direction to the 5th tooth.
It is wound in the one direction from the 5th tooth and then wound in the opposite direction to the 2nd tooth.
It is routed from the 2nd tooth in the above direction and then connected to the 7th segment.
The coil wound around either the 1st tooth or the 4th tooth is the first small coil, and the coil wound around the other is the second small coil.
The coil wound around either the No. 2 tooth or the No. 5 tooth is the first small coil, and the coil wound around the other is the second small coil.
The coil wound around either the No. 3 tooth or the No. 6 tooth is the first small coil, and the coil wound around the other is the second small coil.
The second coil is arranged point-symmetrically about the first coil and the rotation axis.
The coil wound around the other of the No. 1 teeth and the No. 4 teeth is the third small coil, and the coil wound around the one is the fourth small coil.
The coil wound around the other of the 2nd and 5th teeth is the 3rd small coil, and the coil wound around the 1st coil is the 4th small coil.
The coil wound around the other of the 3rd and 6th teeth is the 3rd small coil, and the coil wound around the 1st coil is the 4th small coil. Electric motor.

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