JP2019161727A - motor - Google Patents

Abstract

To provide a motor capable of preventing damage of a connection line by improving a motor performance while attaining downsizing.SOLUTION: When the number of slots 51 of an armature core 6 is defined as Sr and the number of segments 14 is defined as Se, the numbers Sr and Se are set to satisfy Sr=3 Se. A connection line 52 is provided over coils 7 of different phases among coils 7 wound around teeth 50, and both ends of the connection line 52 is connected to coils 7 of the other phases.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a motor.

Among motors, there is a brushed three-phase DC motor (hereinafter referred to as a brushed motor) mounted on a vehicle or the like. This motor with a brush includes a cylindrical yoke having a permanent magnet attached to an inner peripheral surface thereof, and an armature provided rotatably on the radially inner side of the yoke.
The armature includes a rotating shaft, an armature core that is externally fitted to the rotating shaft, and a commutator that is externally fitted and fixed to the rotating shaft so as to be adjacent to the armature core.

The armature core has a plurality of teeth extending in the radial direction and arranged radially. Between the teeth adjacent in the circumferential direction, dovetail-shaped slots are formed. A coil (winding) is wound around each tooth through these slots.
In the commutator, a plurality of segments are arranged along the circumferential direction. Coils are connected to these segments. Each segment is in sliding contact with a brush. The brush is electrically connected to an external power source. And the electric current of an external power supply is applied to each segment via a brush, and an electric current is supplied to each coil.

As a result, a predetermined magnetic field is formed in the armature core, and a magnetic attractive force or repulsive force is generated between the magnetic field and the permanent magnet. For this reason, the armature rotates.
Further, when the armature rotates, the segment in which the brush is in sliding contact is sequentially changed, and so-called rectification is performed in which the direction of the current supplied to the coil is switched. As a result, the armature rotates continuously.

Here, various techniques have been proposed to improve the motor performance of the brushed motor.
For example, a technique for winding a coil around each tooth as follows has been proposed (see, for example, Patent Document 1).
In the following, each tooth is assigned in the order of U, V, and W phases in the circumferential direction, and the teeth are numbered in order from 1 to 9 in the circumferential direction, and the segments are numbered in order from 1 to 27 in the circumferential direction. I will explain.

For example, when the winding start end of the coil is started from the first segment, the coil is first wound around the first tooth after being connected to the first segment. Subsequently, the coil is wound around the fourth tooth. Subsequently, the winding end of the coil is connected to the 8th segment.
Further, the coil connected to the fourth segment is wound around the first tooth in the direction opposite to the forward direction. Subsequently, the coil is wound around the fourth tooth. Thereafter, the coil winding end is connected to the fifth segment.

  Similarly, for example, when the winding start end of the coil starts from the third segment, the coil is wound around the second and fifth teeth in the forward direction after being connected to the third segment. Subsequently, the winding end of the coil is connected to the 10th segment. Moreover, a coil is wound around the 2nd and 5th teeth in the reverse direction. The coil winding start end and winding end end are connected to the 6th and 7th segments, respectively. This is sequentially performed between segments corresponding to each phase. In addition, the segments having the same potential are short-circuited by a connecting line (equal pressure line).

  Thus, the coil connection is a so-called delta connection. In addition, by winding the coil in this way, the segment connected to the winding start end of the coil wound in the forward direction of each phase and the winding of the coil wound in the opposite direction of each phase are connected. The relative position with the segment to which the start end is connected can be made equal to the relative position between the pair of brushes. That is, since the slit between the segments can be used as the center of rectification, the center of the magnetic pole and the center of the brush can be easily matched with the center of rectification. Therefore, motor performance can be improved.

JP 2008-113485 A

  By the way, the coil winding structure as described in Patent Document 1 described above is drawn as a single stroke with a single coil in order to reduce the size of the armature, facilitate the winding work, and improve the motor performance. If it tries to turn, as shown in FIG. 4, the connection line is not drawn all around. That is, for example, the 1st, 10th, and 19th segments 214 having the same potential are connected between the 1st and 10th segments 214 by the connection line 252 and between the 10th and 19th segments 214. Has been. On the other hand, the 19th-1 segment 214 is not connected by the connection line 252.

  In the case of such a coil winding structure, as shown in FIG. 5, when deployed so as to show an electric circuit, one end of the connecting wire 252 connected in series is connected to the coil, but the other end is opened. End up. For this reason, depending on the sliding contact position of the brush to the segment, the current value of the current supplied to the connection line 252 may be about twice the current value of the current supplied to the coil. . As a result, the current value supplied to the connection line 252 increases and the connection line 252 may be damaged. In FIG. 5, “Seg” is an abbreviation for segment.

  Therefore, the present invention provides a motor capable of improving motor performance and preventing damage to connecting wires while achieving downsizing.

In order to solve the above problems, a motor according to the present invention includes a yoke having a plurality of magnetic poles, an armature provided rotatably with respect to the yoke, a plurality of brushes for supplying current to the armature, The armature includes a rotation shaft that rotates about a rotation axis, a plurality of teeth fixed to the rotation shaft and wound with a coil, and a plurality of slots formed between the teeth adjacent in the circumferential direction. An armature core having: a commutator fixed to the rotating shaft, to which the coil is connected and to which the brush is slidably contacted; and a plurality of connection lines that short-circuit the segments having the same potential. , And when the number of the slots is Sr and the number of the segments is Se, each of the numbers Sr and Se is
Sr = 3 · Se
Among the coils wound around each of the teeth, the connection line is provided so as to straddle between the coils of different phases, and both ends of the connection line are in different phases, respectively. It is connected to a coil.

By configuring in this way, the coil winding operation around each tooth and the connection operation of connecting wires to each segment can be performed in series with one coil as in a single stroke. For this reason, motor performance can be improved, aiming at size reduction of a motor.
In addition, since both ends of the connection line are always connected to coils of different phases, one end of the connection line is not opened. For this reason, it is possible to prevent the current value of the current supplied to the connection line from being about twice the current value of the current supplied to the coil. Therefore, damage to the connection line can be prevented.

  The motor according to the present invention is characterized in that the coil wound around the teeth having the same phase is continuously wound around all the teeth having the same phase, and both ends thereof are connected to the segment. And

By comprising in this way, compared with the case where the terminal part of the coil wound around each teeth is connected to a corresponding segment, the amount of coil routing can be reduced.
Further, the coil can be easily routed as much as the coil routing amount can be reduced.

  In the motor according to the present invention, the number of slots Sr is set to 9, the number of segments Se is set to 27, the teeth are sequentially numbered from 1 to 6 in the circumferential direction, and the segments are circumferentially arranged. When numbers are assigned in order from 1 to 12, the coil is connected at both ends between the 1st and 20th segments and wound in the forward direction on the 1st, 4th and 7th teeth, and the 5th- Both ends are connected between the 6th segment, the 1st, 4th and 7th teeth are wound in the direction opposite to the forward direction, and both ends are connected between the 24th and 25th segments, and 1 No. 4, No. 7 and No. 7 are wound in the reverse direction, both ends are connected between No. 4 and No. 23 segments, and No. 2, No. 5 and No. 8 are wound in the forward direction, Both ends are connected between the 8th and 9th segments At the same time, it is wound around the second, fifth, and eighth teeth in the reverse direction, and both ends are connected between the nineteenth and twenty-seventh segments, and the opposite direction is applied to the second, fifth, and eighth teeth. And both ends are connected between the 7th and 26th segments, and are wound around the 3rd, 6th and 9th teeth in the forward direction, and both ends are connected between the 2nd and 3rd segments. At the same time, it is wound around the No. 3, No. 6, No. 9 teeth in the reverse direction, and both ends are connected between the No. 21 and No. 22 segments, and the No. 3, No. 6 and No. 9 teeth are connected in the opposite direction. It is characterized by being wound.

With such a configuration, in the so-called 9-slot 27-segment motor with 9 slots and 27 segments, the coil winding work to each tooth and the connection work of the connecting wire to each segment can be performed with one stroke. It can be done with one coil in a series as written. Therefore, the motor performance can be improved while reducing the size of the 9-slot 27-segment motor.
In addition, both ends of the connection line can always be connected to coils of different phases. For this reason, in the 9-slot 27-segment motor, it is possible to prevent the current value of the current supplied to the connection line from being about twice the current value of the current supplied to the coil. Therefore, damage to the connection line can be prevented.

In the motor according to the present invention, the yoke is formed in a bottomed cylindrical shape, has a bracket for closing the opening of the yoke, the maximum radial length of the yoke is Lx, and the bottom of the yoke When the outer length between the bracket and the bracket is Ly, the maximum length Lx and the length Ly are
Lx> Ly
It is set so that it may satisfy | fill.

  By comprising in this way, a small and flat motor can be provided.

According to the present invention, the winding operation of the coil around each tooth and the connecting operation of the connection line to each segment can be performed in series with one coil as in a single stroke. For this reason, motor performance can be improved, aiming at size reduction of a motor.
In addition, since both ends of the connection line are always connected to coils of different phases, one end of the connection line is not opened. For this reason, it is possible to prevent the current value of the current supplied to the connection line from being about twice the current value of the current supplied to the coil. Therefore, damage to the connection line can be prevented.

It is sectional drawing in alignment with the axial direction of the motor with a brush in embodiment of this invention. It is the figure which developed the permanent magnet, teeth, segment, and coil in the embodiment of the present invention. It is explanatory drawing which shows the electric circuit of the coil in embodiment of this invention. It is the figure which expand | deployed the conventional tooth | gear, a segment, a coil, and a connection line. It is explanatory drawing which shows the electric circuit of the conventional coil.

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

(Brush motor)
FIG. 1 is a cross-sectional view of the brushed motor 1 along the axial direction.
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 that is rotatably provided in a substantially bottomed cylindrical yoke 2, and an opening 2 c of the yoke 2 is closed by an end bracket 17.

  On the outer peripheral wall 2a of the yoke 2, a stay 9 used for fixing the brushed motor 1 is projected. Further, six permanent magnets 4 (see also FIG. 2) are provided in the circumferential wall 2a along the circumferential direction so that the magnetic poles are in order. Further, a boss portion 10 is formed on the bottom portion 2b of the yoke 2 substantially at the center in the radial direction. An insertion hole 11 for inserting the rotation shaft 5 of the armature 3 is formed in the boss portion 10. The insertion hole 11 is provided with a bearing 12 for rotatably supporting one end of the rotary shaft 5.

The armature 3 includes an armature core 6 fixed to the outside of the rotary shaft 5, a coil 7 wound around the armature core 6, and a commutator 13 disposed on the other end side of the rotary shaft 5.
The armature core 6 is obtained by laminating a plurality of ring-shaped metal plates 8 in the axial direction. The armature core 6 may be formed by pressurizing soft magnetic powder.
Nine T-shaped teeth 50 are formed radially on the outer peripheral portion of the armature core 6 when viewed from the axial direction. Slots 51 (see FIG. 2) are formed between the teeth 50, respectively. The coil 7 is wound around the tooth 50 through the slot 51 by a concentrated winding method (details will be described later).

27 segments 14 made of a conductive material are attached to the outer peripheral surface of the commutator 13.
Here, in the motor 1 with a brush, when the number of slots 51 is Sr and the number (number) of segments 14 is Se, the numbers Sr and Se are
Sr = 3 · Se (1)
It is set to satisfy.
The motor 1 with a brush according to the present embodiment has a so-called 6-pole 9 having 6 permanent magnets 4 (4 magnetic poles), 9 slots 51 (9 teeth 50), and 27 segments 14. It is a motor of slot 27 segments (3 times segment). For this reason, the motor 1 with a brush satisfies the above formula (1).

  The segments 14 are made of plate-like 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. A riser 15 that is folded back to the outer diameter side is integrally formed with the segment 14 at the end of each segment 14 on the armature core 6 side. A coil 7 wound around a tooth 50 is wound around the riser 15 and fixed by, for example, fusing. Thereby, the segment 14 and the coil 7 corresponding to this are electrically connected.

  In addition, among the segments 14, the coil 7 is connected so as to short-circuit predetermined three segments 14, that is, three segments 14 having the same potential (see FIG. 2, details will be described later). ). The coil 7 that short-circuits the two segments 14 having the same potential functions as a connection line (equal pressure equalization line) 52. These connection lines 52 are also wound around the riser 15 of the predetermined segment 14, and are fixed by, for example, fusing.

  The end bracket 17 is made of metal and has a substantially disc shape. A boss portion 18 is formed so as to protrude outward in the axial direction at a substantially radial center of the end bracket 17. A bearing 19 for rotatably supporting the other end side of the rotating shaft 5 is press-fitted and fixed to the boss portion 18. A brush unit 60 is provided on the inner side of the end bracket 17 (lower side in FIG. 1). The brush unit 60 includes a substantially disc-shaped holder stay 20 fixed to the inside of the end bracket 17, four brush holders 21 disposed on the surface of the holder stay 20 opposite to the end bracket 17, and the brush holders. The brush 22 accommodated in 21 is the main component.

  The holder stay 20 is made of resin and has an opening 20a into which the commutator 13 can be inserted at the center in the radial direction. The holder stay 20 is provided with a plurality (for example, four) of brush holders 21 around the opening 20a, that is, around the commutator 13. Each brush holder 21 is arranged to be long in the radial direction. Each brush holder 21 is provided with a brush 22 that can be moved in and out in a state where the brush 22 is urged through a spring 23. The tip of each brush 22 is brought into sliding contact with the segment 14 of the commutator 13 by the spring 23.

  Each brush 22 is electrically connected to an external power source via a pigtail (not shown). Each brush 22 is classified into a positive electrode brush and a negative electrode brush. Such brushes 22 are arranged at an electrical angle of 90 °.

Here, when the maximum length in the radial direction of the yoke 2 is Lx and the length between the bottom 2b of the yoke 2 and the end bracket 17 is Ly, the maximum length Lx and the length Ly are
Lx> Ly (2)
It is set to satisfy. For this reason, the motor 1 with a brush is comprised as what is called a flat type motor.

(Coil winding method)
Next, a method for winding the coil 7 will be described with reference to FIG.
FIG. 2 is an expanded view of the tooth 50, the segment 14, and the coil 7 (connection line 52) of the armature 3, and a gap between adjacent teeth 50 corresponds to the slot 51.
Here, as shown in FIG. 2, the armature 3 has a three-phase (U-phase, V-phase, W-phase) structure, and each tooth 50 is arranged in the order of the U-phase, V-phase, and W-phase in the circumferential direction. Assigned.

  In the following description, the phases and numbers assigned to the respective teeth 50 are assigned in order, and the segments 14 are sequentially assigned numbers in the circumferential direction. In FIG. 2, each segment 14 is numbered so that the first segment 14 is positioned in the vicinity of the U1 (1) tooth 50. However, the present invention is not limited to this. The position of the segment 14 can be arbitrarily set.

  First, the coil 7 wound around the teeth 50 of the U phase (U1, U2, U3) will be described. The coil 7 is wound in series around the U1 (1) number, U2 (4) number, and U3 (7) number 50 teeth to which the U phase is assigned. In addition, each of U1 (1), U2 (4), and U3 (7) teeth 50 includes three coils 71Ua to 73Uc (first U-phase forward coil 71Ua, second U-phase forward coil 72Ua, and third U-phase forward coil). 73Ua, first U-phase reverse coils 71Ub, 71Uc, second U-phase reverse coils 72Ub, 72Uc, and third U-phase reverse coils 73Ub, 73Uc).

  That is, in each U-phase forward coil 71Ua to 73Ua, the coil 7 is wound around the U1 (1) -numbered tooth 50 in the forward direction (clockwise direction in FIG. 2) by the concentrated winding method to form the first U-phase forward coil 71Ua. Is done. One end of the first U-phase sequential coil 71Ua is drawn from the slot 51 between the U1 (1) -V1 (2) teeth 50 to the commutator 13 side (the lower side in FIG. 2), and the W1 (3)- It is drawn into the slot 51 between the U2 (4) th teeth 50. Then, the coil 7 is wound around the U2 (4) tooth 50 in the forward direction by the concentrated winding method, and the second U-phase forward coil 72Ua is formed.

  One end of the second U-phase sequential coil 72Ua is drawn to the commutator 13 side from the slot 51 between the U2 (4) -V2 (5) teeth 50, and the W2 (6) -U3 (7) teeth 50 Into the slot 51 between. Then, the coil 7 is wound around the U3 (7) number tooth 50 in the forward direction by the concentrated winding method to form a third U-phase forward coil 73Ua. One end of the U-phase forward coils 71Ua to 73Ua formed in this way is connected to the first segment 14. The other ends of the U-phase forward coils 71Ua to 73Ua are connected to the 20th segment 14.

  Subsequently, in each U-phase reverse coil 71Ub to 73Ub, the coil 7 is wound around the U1 (1) number tooth 50 in the direction opposite to the forward direction (counterclockwise direction in FIG. 2) by the concentrated winding method. A phase reverse coil 71Ub is formed. One end of the first U-phase reverse coil 71Ub is drawn from the slot 51 between the W3 (9) -U1 (1) teeth 50 to the commutator 13 side, and the U3 (7) -V3 (8) teeth 50 Into the slot 51 between. Then, the coil 7 is wound around the U3 (7) tooth 50 in the reverse direction by the concentrated winding method, and the third U-phase reverse coil 73Ub is formed.

  One end of the third U-phase reverse coil 73Ub is drawn from the slot 51 between the W2 (6) -U3 (7) teeth 50 to the commutator 13 side, and the U2 (4) -V2 (5) teeth 50 Into the slot 51 between. Then, the coil 7 is wound around the U2 (4) tooth 50 in the reverse direction by the concentrated winding method to form the second U-phase reverse coil 72Ub. One end of the U-phase reverse coils 71 Ub to 73 Ub formed in this way is connected to the fifth segment 14. The other ends of the U-phase reverse coils 71 Ub to 73 Ub are connected to the sixth segment 14.

  Subsequently, in each U-phase reverse coil 71Uc to 73Uc, the coil 7 is wound around the U3 (7) -th tooth 50 in the reverse direction by the concentrated winding method to form a third U-phase reverse coil 73Uc. One end of the third U-phase reverse coil 73Uc is drawn from the slot 51 between the W2 (6) -U3 (7) teeth 50 to the commutator 13 side, and the U2 (4) -V2 (5) teeth 50 Into the slot 51 between. Then, the coil 7 is wound around the U2 (4) tooth 50 in the reverse direction by the concentrated winding method to form the second U-phase reverse coil 72Uc.

  One end of the second U-phase reverse coil 72Uc is drawn from the slot 51 between the W1 (3) -U2 (4) teeth 50 to the commutator 13 side, and the U1 (1) -V1 (2) teeth 50 Into the slot 51 between. Then, the coil 7 is wound around the U1 (1) -numbered tooth 50 in the reverse direction by the concentrated winding method to form the first U-phase reverse coil 71Uc. One end of the U-phase reverse coils 71 </ b> Uc to 73 </ b> Uc formed in this way is connected to the 24th segment 14. The other ends of the U-phase reverse coils 71 Uc to 73 Uc are connected to the 25th segment 14.

  Next, the coil 7 wound around the V-phase (V1, V2, V3) teeth 50 will be described. The coil 7 is wound in series around the V1 (2), V2 (5), and V3 (8) teeth 50 to which the V phase is assigned. The V1 (2), V2 (5), and V3 (8) teeth 50 have three coils 71Va to 73Vc (first V-phase forward coil 71Va, second V-phase forward coil 72Va, and third V-phase forward coil, respectively). 73Va, first V-phase reverse coils 71Vb and 71Vc, second V-phase reverse coils 72Vb and 72Vc, and third V-phase reverse coils 73Vb and 73Vc).

  That is, in each of the V-phase forward coils 71Va to 73Va, the coil 7 is wound around the V1 (2) number tooth 50 in the forward direction by the concentrated winding method, thereby forming the first V-phase forward coil 71Va. One end of the first V-phase forward coil 71Va is drawn from the slot 51 between the V1 (2) -W1 (3) teeth 50 to the commutator 13 side, and the U2 (4) -V2 (5) teeth 50 Into the slot 51 between. Then, the coil 7 is wound around the V2 (5) tooth 50 in the forward direction by the concentrated winding method, and the second V-phase forward coil 72Va is formed.

  One end of the second V-phase forward coil 72Va is drawn from the slot 51 between the V2 (5) -W2 (6) teeth 50 to the commutator 13 side, and the U3 (7) -V3 (8) teeth 50 Into the slot 51 between. Then, the coil 7 is wound around the V3 (8) teeth 50 in the forward direction by the concentrated winding method to form the third V-phase forward coil 73Va. One end of the V-phase forward coils 71Va to 73Va formed in this way is connected to the fourth segment 14. The other ends of the V-phase forward coils 71Va to 73Va are connected to the 23rd segment 14.

  Subsequently, in each of the V-phase reverse coils 71Vb to 73Vb, the coil 7 is wound around the V1 (2) -th teeth 50 in the reverse direction by the concentrated winding method to form the first V-phase reverse coil 71Vb. One end of the first V-phase reverse coil 71Vb is drawn from the slot 51 between the U1 (1) -V1 (2) th teeth 50 to the commutator 13 side, and the V3 (8) -W3 (9) th teeth 50 Into the slot 51 between. Then, the coil 7 is wound around the V3 (8) teeth 50 in the reverse direction by the concentrated winding method to form the third V-phase reverse coil 73Vb.

  One end of the third V-phase reverse coil 73Vb is drawn from the slot 51 between the U3 (7) -V3 (8) teeth 50 to the commutator 13 side, and the V2 (5) -W2 (6) teeth 50 are provided. Into the slot 51 between. Then, the coil 7 is wound around the V2 (5) number tooth 50 in the reverse direction by the concentrated winding method to form the second V-phase reverse coil 72Vb. One end of the V-phase reverse coils 71 </ b> Vb to 73 </ b> Vb formed in this way is connected to the eighth segment 14. Further, the other ends of the V-phase reverse coils 71 </ b> Vb to 73 </ b> Vb are connected to the ninth segment 14.

  Subsequently, in each of the V-phase reverse coils 71Vc to 73Vc, the coil 7 is wound around the V1 (2) -th tooth 50 in the reverse direction by the concentrated winding method, thereby forming the first V-phase reverse coil 71Vc. One end of the first V-phase reverse coil 71Vc is drawn from the slot 51 between the U1 (1) -V1 (2) th teeth 50 to the commutator 13 side, and the V3 (8) -W3 (9) th teeth 50 Into the slot 51 between. Then, the coil 7 is wound around the V3 (8) teeth 50 in the reverse direction by the concentrated winding method to form the third V-phase reverse coil 73Vc.

  One end of the third V-phase reverse coil 73Vc is drawn from the slot 51 between the U3 (7) -V3 (8) teeth 50 to the commutator 13 side, and the V2 (5) -W2 (6) teeth 50 Into the slot 51 between. Then, the coil 7 is wound around the V2 (5) number tooth 50 in the reverse direction by the concentrated winding method to form the second V-phase reverse coil 72Vc. One end of the V-phase reverse coils 71Vc to 73Vc formed in this way is connected to the 27th segment 14. The other ends of the V-phase reverse coils 71 Vc to 73 Vc are connected to the 19th segment 14.

  Next, the coil 7 wound around the teeth 50 of the W phase (W1, W2, W3) will be described. The coil 7 is wound around a series of W1 (3), W2 (6), and W3 (9) teeth 50 to which the W phase is assigned. The W1 (3), W2 (6), and W3 (9) teeth 50 include three coils 71Wa to 73Wc (first W-phase forward coil 71Wa, second W-phase forward coil 72Wa, and third W-phase forward coil, respectively). 73Wa, first W-phase reverse coils 71Wb, 71Wc, second W-phase reverse coils 72Wb, 72Wc, and third W-phase reverse coils 73Wb, 73Wc).

  That is, in each of the W-phase forward coils 71Wa to 73Wa, the coil 7 is wound around the W1 (3) -numbered tooth 50 in the forward direction by the concentrated winding method to form the first W-phase forward coil 71Wa. One end of the first W-phase forward coil 71Wa is drawn from the slot 51 between the W1 (3) -U2 (4) teeth 50 to the commutator 13 side, and the V2 (5) -W2 (6) teeth 50 Into the slot 51 between. Then, the coil 7 is wound around the W2 (6) number tooth 50 in the forward direction by the concentrated winding method to form the second W-phase forward coil 72Wa.

  One end of the second W-phase forward coil 72Wa is drawn from the slot 51 between the W2 (6) -U3 (7) tooth 50 to the commutator 13 side, and the V3 (8) -W3 (9) tooth 50 is drawn. Into the slot 51 between. Then, the coil 7 is wound around the W3 (9) tooth 50 in the forward direction by the concentrated winding method to form the third W-phase forward coil 73Wa. One end of each of the W-phase forward coils 71 </ b> Wa to 73 </ b> Wa thus formed is connected to the seventh segment 14. The other ends of the W-phase forward coils 71 Wa to 73 Wa are connected to the 26th segment 14.

  Subsequently, in each of the W-phase reverse coils 71Wb to 73Wb, the coil 7 is wound around the W3 (9) -th tooth 50 in the reverse direction by the concentrated winding method to form the third W-phase reverse coil 73Wb. One end of the third W-phase reverse coil 73Wb is drawn from the slot 51 between the V3 (8) -W3 (9) teeth 50 to the commutator 13 side, and the W2 (6) -U3 (7) teeth 50 Into the slot 51 between. Then, the coil 7 is wound around the W2 (6) number tooth 50 in the reverse direction by the concentrated winding method to form the second W-phase reverse coil 72Wb.

  One end of the second W-phase reverse coil 72Wb is drawn from the slot 51 between the V2 (5) -W2 (6) teeth 50 to the commutator 13 side, and the W1 (3) -U2 (4) teeth 50 Into the slot 51 between. Then, the coil 7 is wound around the W1 (3) number tooth 50 in the reverse direction by the concentrated winding method to form the first W-phase reverse coil 71Wb. One end of the W-phase reverse coils 71 </ b> Wb to 73 </ b> Wb formed in this way is connected to the second segment 14. The other ends of the W-phase reverse coils 71 Wb to 73 Wb are connected to the third segment 14.

  Subsequently, in each of the W-phase reverse coils 71Wc to 73Wc, the coil 7 is wound around the W2 (6) -th tooth 50 in the reverse direction by the concentrated winding method to form the second W-phase reverse coil 72Wc. One end of the second W-phase reverse coil 72Wc is drawn from the slot 51 between the V2 (5) -W2 (6) teeth 50 to the commutator 13 side, and the W1 (3) -U2 (4) teeth 50 Into the slot 51 between. Then, the coil 7 is wound around the W1 (3) th tooth 50 in the reverse direction by the concentrated winding method to form the first W-phase reverse coil 71Wc.

  One end of the first W-phase reverse coil 71Wc is drawn from the slot 51 between the V1 (2) -W1 (3) teeth 50 to the commutator 13 side, and the W3 (9) -U1 (1) teeth 50 Into the slot 51 between. Then, the coil 7 is wound around the W3 (9) tooth 50 in the reverse direction by the concentrated winding method to form the third W-phase reverse coil 73Wc. One end of the W-phase reverse coils 71 Wc to 73 Wc formed in this way is connected to the 21st segment 14. The other ends of the W-phase reverse coils 71 Wc to 73 Wc are connected to the 22nd segment 14.

Next, the connection line 52 will be described.
The connection line 52 connects every eight segments 14 (three segments 14 having the same potential) having the same potential, and short-circuits the segments 14 having the same potential. The connection line 52 connects the segments 14 on both sides of the three segments 14 having the same potential with the one segment 14 interposed therebetween, and the connection line 52 and the three segments 14. Among these, the segment 14 located between them is connected. In this way, when the segments 14 having the same potential are short-circuited, the connection lines 52 are short-circuited without being routed over the entire circumference.

More specifically, the first segment 14 and the tenth segment 14 are connected by the connection line 52. Further, the tenth segment 14 and the nineteenth segment 14 are connected by the connection line 52. The connection line 52 is not routed between the 1st segment 14 and the 19th segment 14 having the same potential.
Further, the second segment 14 and the eleventh segment 14 are connected by the connection line 52. Further, the 11th segment 14 and the 20th segment 14 are connected by the connection line 52. The connection line 52 is not routed between the 2nd segment 14 and the 20th segment 14 having the same potential.

Further, the third segment 14 and the twelfth segment 14 are connected by the connection line 52. Further, the 12th segment 14 and the 21st segment 14 are connected by the connection line 52. The connection line 52 is not routed between the 3rd segment 14 and the 21st segment 14 having the same potential.
Further, the fourth segment 14 and the thirteenth segment 14 are connected by the connection line 52. Further, the 13th segment 14 and the 22nd segment 14 are connected by the connection line 52. The connection line 52 is not routed between the fourth segment 14 and the twenty-second segment 14 having the same potential.

Further, the fifth segment 14 and the fourteenth segment 14 are connected by the connection line 52. Further, the 14th segment 14 and the 23rd segment 14 are connected by the connection line 52. The connection line 52 is not routed between the 5th segment 14 and the 23rd segment 14 having the same potential.
Further, the sixth segment 14 and the fifteenth segment 14 are connected by the connection line 52. Further, the 15th segment 14 and the 24th segment 14 are connected by a connection line 52. The connection line 52 is not routed between the 6th segment 14 and the 24th segment 14 having the same potential.

Further, the seventh segment 14 and the sixteenth segment 14 are connected by the connection line 52. Further, the 16th segment 14 and the 25th segment 14 are connected by the connection line 52. The connection line 52 is not routed between the 7th segment 14 and the 25th segment 14 having the same potential.
Further, the eighth segment 14 and the seventeenth segment 14 are connected by the connection line 52. Further, the 17th segment 14 and the 26th segment 14 are connected by the connection line 52. The connection line 52 is not routed between the 8th segment 14 and the 26th segment 14 having the same potential.

  Further, the ninth segment 14 and the eighteenth segment 14 are connected by the connection line 52. Further, the 18th segment 14 and the 27th segment 14 are connected by the connection line 52. The connection line 52 is not routed between the 9th segment 14 and the 27th segment 14 having the same potential.

Next, an electric circuit of the coil 7 wound as described above will be described with reference to FIG.
FIG. 3 is an explanatory diagram showing an electric circuit of the coil 7. In FIG. 3, “Seg” is an abbreviation of the segment 14.
As shown in FIG. 3, the coils 71Ua to 73Wc and the connection line 52 are connected in series in a loop shape. And as for the coil 7 wound as mentioned above, the connection line 52 straddles between the coils 71Ua-73Wc of different phases among the coils 71Ua-73Wc wound around each tooth 50. And both ends of each connection line 52 connected in series are connected to coils 71Ua to 73Wc of different phases.

Since it becomes such an electric circuit, it is possible to form each coil 71Ua-73Wc and the connection line 52 as mentioned above, drawing the coil 7 in series like one stroke. At this time, the coil 7 that connects the same potential and the segments 14 functions as the connection line 52.
Further, when the brush 22 (positive brush, negative brush) is brought into sliding contact with the predetermined segment 14, a parallel electric circuit is formed between the brushes 22.

Therefore, according to the above-described embodiment, the winding work of the coil 7 to each tooth 50 and the connecting work of the connection line 52 to each segment 14 can be performed in series with one coil 7 as in a single stroke. it can. For this reason, motor performance can be improved, aiming at size reduction of the motor 1 with a brush.
Further, since both ends of the connection line 52 are always connected to the coils 71Ua to 73Wc of different phases, one end of the connection line 52 is not opened as in the prior art. For this reason, it is possible to prevent the current value of the current supplied to the connection line 52 from being about twice the current value of the current supplied to the coils 71Ua to 73Wc. Therefore, damage to the connection line 52 can be prevented.

  Further, the coil 7 wound around the teeth 50 having the same phase is continuously wound around all of the teeth 50 having the same phase and is connected to the segment 14 only at both ends. For this reason, compared with the case where the terminal part of the coils 71Ua-73Wc wound around each tooth | gear 50 is connected to the corresponding segment 14, respectively, the routing amount of the coils 71Ua-73Wc can be reduced. In addition, the coil 7 can be easily routed as much as the amount of routing of the coils 71Ua to 73Wc can be reduced.

  The brushed motor 1 has a maximum length Lx and a length Ly, where Lx is the maximum radial length of the yoke 2 and Ly is the length between the bottom 2b of the yoke 2 and the end bracket 17. Is set to satisfy the above equation (2). For this reason, the motor 1 with a brush can be comprised as what is called a flat motor, and the motor 1 with a brush can be reduced in size effectively.

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

In the above-described embodiment, the brushed motor 1 includes six permanent magnets 4 (the number of magnetic poles is four), nine slots 51 (9 teeth 50), and 27 segments 14. The case of a so-called 6-pole 9-slot 27-segment (triple segment) motor has been described. Further, in the brushed motor 1, the coil 7 wound around the teeth 50 having the same phase is continuously wound around all the teeth 50 having the same phase and is connected to the segment 14 only at both ends. explained.
However, the present invention is not limited to this. In the motor 1 with brush, when the number of slots 51 is Sr and the number (number) of segments 14 is Se, the numbers Sr and Se satisfy the above formula (1). It suffices if it is set as follows. At this time, among the coils 7 wound around the teeth 50, the connection line 52 may be straddled between the coils 7 of different phases. And the both ends of each connection line 52 connected in series should just be connected to the coil 7 of a different phase, respectively. Therefore, the coils 7 may not be continuously wound around all the teeth 50 in phase.

DESCRIPTION OF SYMBOLS 1 ... Motor with a brush (motor), 2 ... Yoke, 2b ... Bottom part, 2c ... Opening part, 3 ... Armature, 4 ... Permanent magnet (magnetic pole), 5 ... Rotating shaft, 6 ... Armature core, 7 ... Coil, 13 ... Commutator, 14 ... segment, 17 ... end bracket (bracket), 22 ... brush, 50 ... teeth, 51 ... slot, 52 ... connection line

Claims (4)

A yoke having a plurality of magnetic poles;
An armature provided rotatably with respect to the yoke;
A plurality of brushes for supplying current to the armature;
With
The armature is
A rotation axis that rotates about the rotation axis;
An armature core having a plurality of teeth fixed to the rotating shaft and wound with a coil, and a plurality of slots formed between the teeth adjacent in the circumferential direction;
A commutator having a plurality of segments fixed to the rotating shaft, to which the coil is connected and to which the brush is slid;
A plurality of connecting lines for short-circuiting the segments having the same potential;
With
When the number of slots is Sr and the number of segments is Se, each of the numbers Sr and Se is
Sr = 3 · Se
Is set to meet
Among the coils wound around each of the teeth, the connection line is provided so as to straddle between the coils of different phases, and both ends of the connection line are respectively connected to the coils of different phases. Motor. 2. The coil wound around the teeth having the same phase is wound continuously in series around all the teeth having the same phase, and only both ends thereof are connected to the segment. Motor. Set the number of slots Sr to 9 and the number of segments Se to 27;
When the teeth are sequentially numbered from 1 to 6 in the circumferential direction, and the segments are sequentially numbered from 1 to 12 in the circumferential direction,
The coil is
Both ends are connected between the No. 1-20 segment and wound in the forward direction on No. 1, No. 4, No. 7 teeth,
Both ends are connected between the 5th and 6th segments and wound around the 1st, 4th and 7th teeth in the direction opposite to the forward direction,
Both ends are connected between the 24th and 25th segments and wound in the reverse direction on the 1st, 4th and 7th teeth,
Both ends are connected between the 4th and 23rd segments and wound in the forward direction on the 2nd, 5th and 8th teeth,
Both ends are connected between the 8th and 9th segments, and wound around the 2nd, 5th and 8th teeth in the reverse direction,
Both ends are connected between the 19th to 27th segments and wound around the 2nd, 5th and 8th teeth in the reverse direction,
Both ends are connected between the 7th and 26th segments and wound in the forward direction on the 3rd, 6th and 9th teeth,
Both ends are connected between the No. 2 and No. 3 segments and wound around the No. 3, No. 6, No. 9 teeth in the reverse direction,
The motor according to claim 2, wherein both ends are connected between the 21st and 22nd segments and wound around the 3rd, 6th and 9th teeth in the reverse direction. The yoke is formed in a bottomed cylindrical shape,
A bracket for closing the opening of the yoke;
When the maximum radial length of the yoke is Lx, and the outer length between the bottom of the yoke and the bracket is Ly, the maximum length Lx and the length Ly are
Lx> Ly
4. The motor according to claim 1, wherein the motor is set to satisfy the following.

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