JP2003169458A - Wiring structure for equalizing wire in rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiring structure for equalizing wire in a rotating electric machine wherein an increase in thickness due to winding at the base of the neck of a rectifier is suppressed, and insulation between a rotating shaft and an equalizing wire, and winding is enhanced. <P>SOLUTION: The wiring structure for equalizing wire is for a rotating electric machine having an equalizing wire 16a for connecting rectifier pieces 14a and 14b which are to have the same potential. The equalizing wire 16a is wound in a slot 13a located at a position shifted from the rectifier piece 14a by 90° (at a position shifted by 360°/n, where n is the number of poles of field magnets). The equalizing wire 16a is guided into a slot 13b located in the opposite position at the end opposite the rectifier 6, and wound therein. The equalizing wire 16a is then connected to the rectifier piece 14b located at the position shifted by 90° at the end of a slot 13b on the side of the rectifier. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine such as a motor or a generator, and more particularly to a wiring structure of a pressure equalizing wire connecting commutator pieces having the same potential.

[0002]

2. Description of the Related Art Conventionally, in a DC rotating electric machine, a short-circuit wire called a pressure equalizing wire for electrically connecting commutator pieces of the same potential is used in addition to the coil winding. This pressure equalizing wire is effective for preventing abnormal noise of the rotating electric machine, etc. by allowing a circulating current due to the non-uniformity of induced voltages generated in each winding circuit to flow without passing through the brush. For such a pressure equalizing wire, a method has often been used in which the end face of the commutator is wired separately from the winding so as to connect between the equipotential commutators, but in recent years, the extension of the winding has been used. Then, a method of laying it in the slot of the armature core has also been proposed.

For example, Japanese Unexamined Patent Publication No. 2000-60049 discloses a configuration in which the other end of a pressure equalizing wire, one end of which is connected to one commutator piece, is connected to the other commutator piece through a slot. ing. FIG. 7 is a coil connection diagram showing the state of windings in a rotary electric machine in which a pressure equalizing wire is thus wired in the slot. The winding shown in FIG. 7 is a so-called double winding, and a pressure equalizing wire 52 is provided on the first layer of the winding so as to extend the winding 51 as it is.

[0004]

However, in such a wiring system, when a sufficient space cannot be secured in the lower part of the commutator neck, that is, between the commutator and the armature core, the necking is performed by the pressure equalizing wire and the winding wire. There was a problem that the winding was thick at the bottom and the winding arrangement became difficult. Further, although it is required that the rotating shaft and the pressure equalizing wire and the winding are in an insulating state, there is a problem that as the winding arrangement becomes more difficult, there is a higher possibility that they will come into contact with each other.

An object of the present invention is to provide a pressure-equalizing wire wiring structure for a rotating electric machine which can reduce winding thickening in a lower portion of a neck of a commutator and improve insulation between a rotary shaft and a pressure equalizing wire or a winding. To provide.

[0006]

A pressure equalizing wire wiring structure for a rotating electric machine according to the present invention comprises an armature core provided with a plurality of slots attached to a rotary shaft and extending in the axial direction of the rotary shaft, and an outer side of the armature core. A field magnet arranged in the slot, a winding formed by winding a conductive wire in the slot, a commutator having a plurality of commutator pieces attached to the rotary shaft adjacent to the armature core, and the same potential. A pressure equalizing wire wiring structure for a rotating electric machine, comprising: a pressure equalizing wire that connects the commutator pieces to each other, wherein the pressure equalizing wire extends from the commutator piece to the number n of poles of the field magnet. For 36
It is characterized in that it is wound around a slot at a position shifted by 0 ° / n and connected to another commutator piece.

In the present invention, since the pressure equalizing wire is wired in the slot at a position shifted by 360 degrees / n from the commutator piece, the pressure equalizing wire competes with the winding of the connected commutator piece. It is possible to wire a pressure equalizing wire between the commutator and the armature core without. Therefore, the space efficiency of the lower part of the neck of the commutator can be improved, and the winding thickening of the under-neck winding can be reduced.

Further, since the pressure equalizing wire is wound around the slot without touching the rotary shaft and a space is formed between the rotary shaft and the pressure equalizing wire, a space between the rotary shaft and the pressure equalizing wire is formed. A short circuit can be prevented. At this time, since the winding wire is also wound on the pressure equalizing wire after being attached thereto, insulation between the winding wire and the rotary shaft is also ensured.

Further, in the equalizing wire wiring structure, the equalizing wire is provided in a first slot at a position deviated from the first commutator piece by 360 degrees / n with respect to the pole number n of the field magnet. It is wound and reaches an end on the side opposite to the commutator, is introduced into a second slot at the opposite position at the end and is wound in the second slot, and the second slot It is connected to a second commutator piece that should be at the same potential as the first commutator piece, which is located at a position shifted from the end of the slot on the commutator side by 360 degrees / n with respect to the number n of poles of the field magnet. You may do it. In this case, in the equalizing wire wiring structure, the number of poles may be four, and may be six or eight.

On the other hand, the pressure equalizing wire wiring structure of the rotating electric machine according to the present invention is formed by winding an armature core having a plurality of slots attached to a rotary shaft and extending in the axial direction of the rotary shaft, and a conductive wire around the slots. And a commutator having a plurality of commutator pieces attached to the rotary shaft adjacent to the armature core, and a pressure equalizing wire connecting the commutator pieces having the same potential to each other. A pressure equalizing wire wiring structure of an electric machine, comprising a spacer member made of synthetic resin, which is disposed between the armature core and the commutator and insulates between the pressure equalizing wire and the rotating shaft. Characterize.

In the present invention, since the spacer made of synthetic resin is arranged between the commutator and the armature core, the pressure equalizing wire can be introduced into the slot without touching the rotary shaft. Therefore, the pressure equalizing wire and the rotary shaft are insulated from each other by the spacer, and a short circuit between the rotary shaft and the pressure equalizing wire can be prevented. Further, since the pressure equalizing wire is fixed by the spacer, the space efficiency in the lower part of the neck of the commutator can be improved, and the thickening of the under-neck winding can be reduced.

In this case, in the equalizing wire wiring structure,
A pressure equalizing wire mounting portion to which the pressure equalizing wire is hooked may be provided on the spacer member. Examples of the pressure equalizing wire attachment portion include those formed in a groove shape or a hook shape, and by attaching the pressure equalizing wire thereto, insulation between the pressure equalizing wire and the rotating shaft is ensured and It is possible to reduce the thickening of the winding under the commutator neck.

Further, in the above-mentioned equalizing wire wiring structure, the equalizing wire is formed by a conductor wire having a wire diameter smaller than that of the winding,
This may be wound around the slot before the winding. This allows the equalization wire to be placed in the deepest part of the slot where the winding cannot enter, and the equalization wire is placed in the dead space of the winding, and the space factor due to the equalization wire is placed. It is possible to suppress the increase.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is an explanatory view showing a configuration of a motor to which a pressure equalizing wire wiring structure according to a first embodiment of the present invention is applied, and FIG. 2 is a sectional view taken along the line AA of FIG.

The motor shown in FIG. 1 is a DC motor with an iron core groove, and has a structure in which a rotor 2 is rotatably provided in a bottomed cylindrical yoke 1. Four field magnets 3 are attached to the inner peripheral surface of the yoke 1 at intervals in the circumferential direction, and an armature 5 fixed to a rotary shaft 4 is arranged inside thereof. A commutator 6 is arranged on the left side of the armature 5 in the figure, and four brushes 7 are equally arranged around the commutator 6. On the other hand, a bracket 8 is attached to the left side of the yoke 1 in the figure, and the rotating shaft 4 is rotatably supported by a bearing 9 attached to the bracket 8 and the right end of the yoke 1.

The armature 5 comprises an armature core 10 formed by laminating silicon steel plates, and a winding 12 formed by a conductor 11 made of an enamel-coated copper wire. In this case, the armature core 10
Twenty-two slots 13 extending in the axial direction are provided, and the conductor wire 11 is wound around the slots 13 by a double winding method to form a winding 12.

The commutator 6 is provided adjacent to the armature core 10 and includes 22 commutator pieces 14 fixed to the rotating shaft 4. The commutator pieces 14 are insulated from each other and arranged in the circumferential direction, and the outer peripheral surface thereof is in sliding contact with the brush 7. In addition, each commutator piece 14 has a conductor 11
A riser 15 is provided for fixing the. Further, the riser 15 has a commutator piece 1 which should have the same potential.
A pressure equalizing wire 16 for electrically connecting the four members is fixed. The pressure equalizing wire 16 is composed of a conductor wire 17 which is different from the conductor wire 11, and an enamel-coated copper wire having a smaller diameter than the conductor wire 11 is used.

FIG. 3 is a pressure equalizing line 16 in the motor of FIG.
It is a connection diagram of. In this case, the pressure equalizing line 16 is first shown in FIG.
As shown in FIG. 2, one end of the commutator piece 14 is fixed to the riser 15 of the commutator piece 14 as a starting point by brazing or the like. The equalizing wire 16 is attached to each commutator piece 14, but here, the equalizing wire 16a attached to the commutator piece 14a (first commutator piece in FIG. 3; first commutator piece).
Will be described only. Further, the concept of the start point and the end point is relative, and does not necessarily mean that the pressure equalizing wire 16a is wound from the commutator piece 14a.

2 and 3, the pressure equalizing wire 16a whose one end side is fixed to the commutator piece 14a is next provided with the slot 13 at a position displaced by 90 degrees from the commutator piece 14a.
a (first slot). That is, pressure equalizing line 1
6a is guided in the forward path from the first commutator piece 14a into the slot 13a between the seventeenth teeth 18a and the eighteenth teeth 18b, and is wound therein.

The pressure equalizing wire 16a reaching the end portion of the armature core 10 opposite to the commutator 6 is introduced into the slot 13b (second slot) opposed thereto. That is, the pressure-equalizing line exiting from the slot 13a is passed through the slot 13b between the sixth teeth 18c and the seventh teeth 18d, which are located 180 degrees away from it on the return path,
The slot 13b is wound up to the end on the commutator side. Then, the pressure equalizing wire 16 exiting from the slot 13b is rotated by 90 degrees again, and the other end side of the No. 12 commutator piece 14b (the second commutator piece) at a position opposite to the commutator piece 14a by 180 degrees. ) Is locked to the riser 15.

Like the pressure equalizing line 16a shown in FIG. 3, another pressure equalizing line 16 is attached in the same manner as the pressure equalizing line 16a.
After winding all the pressure equalizing wires 16 of the book, the conducting wire 11 is wound around the slot 13 to form the winding 12. At this time, pressure equalization line 1
The conductive wire 17 forming the winding wire 6 is the conductive wire 11 forming the winding wire 12.
It is thinner than that. Therefore, the lead wire 17 is replaced with the lead wire 1
By winding the conductive wire 11 in the slot 13 prior to 1, the conductive wire 17, that is, the pressure equalizing wire 16 can be arranged at the innermost portion of the slot 13 where the conductive wire 11 cannot enter.
Therefore, the pressure equalizing wire 16 can be arranged in the dead space of the winding wire 12, and the increase of the space factor due to the wiring of the pressure equalizing wire 16 in the slot 13 can be suppressed.

Further, the pressure equalizing wire 16 is connected to the commutator pieces 14 to 90.
Since the wiring is arranged with a degree of deviation, the pressure equalizing line 16a shown in FIG.
As described above, the pressure equalizing wire 16 is wired closer to the rotary shaft 4 side than the bottom of the slot 13. Therefore, as compared with the case where the pressure equalizing wire 16 is directly introduced into the opposing slot 13, the pressure equalizing wire 16
Can be disposed on the rotary shaft 4 side, the space efficiency of the lower portion of the commutator neck can be improved, and the thickening of the under-neck winding can be reduced. Further, the pressure-equalizing wire 16 is rotated by 90 degrees from the commutator piece 14 while tension is applied to the slot 1.
Since it is wound around 3, the pressure equalizing wire 16 is linearly introduced into the slot 13 from the commutator piece. Therefore, the pressure equalizing wire 16 is wound around the slot 13 without touching the rotary shaft 4, and a space is formed between the rotary shaft 4 and the pressure equalizing wire 16 as shown in FIG. That is, an insulating portion 19 formed by air is formed between the pressure equalizing wire 16 and the rotary shaft 4, and the rotary shaft 4 and the pressure equalizing wire 1 are formed.
It is possible to prevent a short-circuit between 6 and 6. Further, since the winding wire 12 is also mounted on the pressure equalizing wire 16 and then wound around it, the insulating property between the winding wire 12 and the rotary shaft 4 is ensured.

An electromotive force is also generated on the pressure equalizing wire 16 itself due to the influence of the field magnet 3. On the other hand, in the equalizing wire wiring structure, the equalizing wire 16 has the commutator pieces 1 at the start and end points.
It is wound by shifting from 4 to 90 degrees, and is wound in slots at opposite positions, which are offset by 180 degrees on the opposite end side. In other words, the pressure equalizing wire 16 is, with respect to the 4-pole field magnet 3,
The forward path and the return path are wired at a position shifted by 180 degrees, and the winding 12 of the commutator piece 14 connected to the wiring is also shifted by 90 degrees. Therefore, the electromotive force generated on the pressure equalizing line 16 has the same phase on the forward path and the return path, and also has the same phase on the electromotive force in the winding 12. Therefore, although the pressure equalizing wire 16 is wired at an angle deviated from the commutator pieces 14 at the start point and the end point, no magnetic obstacle is caused by the electromotive force of the pressure equalizing wire 16.

(Embodiment 2) Next, as Embodiment 2 of the present invention, a wiring structure will be described in which a pressure equalizing wire is wound around a spacer to ensure insulation with a rotating shaft. 4 is an explanatory view showing the structure of a motor to which the pressure equalizing wire wiring structure according to the second embodiment of the present invention is applied, and FIG. 5 is a view showing the structure of a spacer used in the motor of FIG. (a) is the front view, (b) is a side view. In the present embodiment, the same members and parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. Also, FIG.
Shows only the rotor 2 and the yoke 1 existing around it.
The field magnet 3 and the like are omitted.

As shown in FIG. 4, in the rotor 2,
A spacer (spacer member) 20 made of synthetic resin is arranged between the commutator 6 and the armature core 10. As shown in FIG. 5, the spacer 20 is formed in the shape of a hollow cylinder, and is fitted into the rotating shaft 4 and fixed to the end face of the commutator 6 on the armature core 10 side. Also, the spacer 2
22 sets of a pair of engaging projections 21 are provided on the outer peripheral portion of 0, and a pressure equalizing wire mounting groove (pressure equalizing wire mounting Part) 22.

Rotor 2 having such a spacer 20
Then, the pressure equalizing wire 16 extends from the commutator piece 14 to the pressure equalizing wire mounting groove 22.
After being hooked on, it is introduced into the slot 13. That is, the pressure equalizing wire 16 hooked on the riser 15 of the commutator piece 14
Is first introduced into the pressure-equalizing wire mounting groove 22 immediately below it. In this case, the pressure equalizing wire mounting groove 22 is formed to have a diameter slightly smaller than that of the conductor wire 17 that constitutes the pressure equalizing wire 16. Therefore, as shown in FIG. 5, the conductor wire 17 has a pressure equalizing wire mounting groove 22.
It is pressed into the inside and is hooked between the engaging projections 21. Then, after being hooked in the pressure-equalizing wire mounting groove 22, the pressure-equalizing wire 16 is introduced into the slot 13 located at the same position as the commutator piece 14 and wound therein to the opposite end.

The pressure equalizing wire 16 reaching the opposite side of the armature core 10 is guided to the opposing slot 13 and wound therein to the commutator side end portion. The pressure-equalizing wire 16 that has exited the slot 13 at the commutator-side end is hooked in the pressure-equalizing wire mounting groove 22 of the spacer 20 again. And the pressure equalizing line 16
Is the commutator pieces 14 and 180 starting from the pressure-equalizing wire mounting groove 22.
It is locked to the riser 15 of the commutator piece 14 which is located at the opposite position with a deviation.

As described above, in the pressure equalizing wire wiring structure of this embodiment, since the spacer 20 made of synthetic resin is arranged between the commutator 6 and the armature core 10, the pressure equalizing wire 16 is attached to the rotary shaft 4. It can be introduced into the slot 13 without being touched. Therefore, the pressure equalizing wire 16 and the rotating shaft 4 are insulated from each other by the spacer 20, and a short circuit between the rotating shaft 4 and the pressure equalizing wire 16 can be prevented.

Further, in the wiring structure, the pressure equalizing wire 16 is fixed at a position closer to the rotating shaft 4 by the spacer 20 as compared with the case where the pressure equalizing wire 16 is directly introduced into the opposing slot 13. Therefore, the space efficiency in the lower part of the neck of the commutator 6 can be increased, and the thickening of the under-neck winding can be reduced.

The spacer as the insulating member is not limited to the form shown in FIG. 5, but the spacer shown in FIG. 6, for example, can be used. 6A and 6B are views showing a configuration of a modified example of the spacer, FIG. 6A is a front view thereof, and FIG. 6B is a side view thereof. The spacer 25 shown in FIG.
Twenty-two character-shaped hooks 26 are provided, and the inside of the hooks 26 has a pressure equalizing wire mounting portion 2 on which the pressure equalizing wire 16 is hooked.
It is 7. Then, in the spacer 25, as shown in FIG. 6, the conducting wire 17 is hooked inside the hook 26,
Insulation between the pressure equalizing wire 16 and the rotating shaft 4 is ensured.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, and can be variously modified without departing from the scope of the invention. For example, in the above-described embodiment, an example in which the pressure equalizing wire wiring structure according to the present invention is applied to a motor is shown, but it is also possible to apply this to a generator. Further, in the above-described embodiment, a 4-pole motor has been described as an example, but the present invention is also applicable to a 6- or 8-pole rotating electrical machine. In that case, the positional relationship between the pressure equalizing wire 16 and the slot 13 in the first embodiment is 360 /
The deviation is 6 = 60 degrees, and the deviation of 8 poles is 360/8 = 45 degrees.

Further, in the above-described embodiment, the winding 12
Although the example in which the pressure-equalizing wire 16 and the pressure-equalizing wire 16 are formed by different wires is shown, they may be formed by the same conductive wire and the pressure-equalizing wire 16 may be formed on the extension of the winding wire 12. In addition, the winding form of the rotary electric machine to which the equalizing wire wiring structure of the present invention is applied is a double winding,
Any of single winding may be used. Further, the number of slots and the number of pressure equalizing lines are not limited to 22 slots and 11 as in the above embodiment.

[0033]

According to the pressure equalizing wire wiring structure of the rotating electric machine of the present invention, the pressure equalizing wire is wired in the slot at a position deviated by 360 degrees / n from the commutator piece, so that it does not conflict with the winding. A pressure equalizing wire can be routed between the commutator and the armature core. Therefore, the space efficiency of the lower part of the neck of the commutator can be improved, and the winding thickening of the under-neck winding can be reduced.

Further, since the pressure equalizing wire is wound around the slot without touching the rotary shaft and a space is formed between the rotary shaft and the pressure equalizing wire, a space between the rotary shaft and the pressure equalizing wire is formed. A short circuit can be prevented, and the insulation between the winding and the rotary shaft is ensured.

On the other hand, according to the pressure equalizing wire wiring structure of the rotating electric machine of the present invention, since the spacer made of synthetic resin is arranged between the commutator and the armature core, the pressure equalizing wire is brought into contact with the rotating shaft. Can be introduced into the slot without. Therefore, the pressure equalizing wire and the rotary shaft are insulated by the spacer,
It is possible to prevent a short circuit between the rotating shaft and the pressure equalizing wire. Also, since the pressure equalizing wire is fixed by the spacer,
The space efficiency of the lower part of the neck of the commutator can be improved, and the thickening of the under-neck winding can be reduced.

Further, in the above-described equalizing wire wiring structure, the equalizing wire is formed of a conductor wire having a wire diameter smaller than that of the winding wire, and the conducting wire is wound around the slot prior to the winding wire, whereby the innermost portion of the slot is formed. It is possible to wire the pressure equalizing wire to a portion where the winding wire cannot enter. Therefore, it is possible to arrange the pressure equalizing wire in the dead space of the winding, and it is possible to suppress the increase of the space factor due to the wiring of the pressure equalizing wire in the slot.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a motor to which a pressure equalizing wire wiring structure according to a first embodiment of the present invention is applied.

2 is a cross-sectional view of the rotor taken along the line AA of FIG.

FIG. 3 is a connection diagram of pressure equalizing lines in the motor of FIG.

FIG. 4 is an explanatory diagram showing a configuration of a rotor of a motor to which a pressure equalizing wire wiring structure according to a second embodiment of the present invention is applied.

5A and 5B are diagrams showing a configuration of a spacer used in the motor of FIG. 4, where FIG. 5A is a front view thereof and FIG. 5B is a side view thereof.

FIG. 6 is a diagram showing a configuration of a modified example of a spacer,
(A) is the front view, (b) is a side view.

FIG. 7 is a coil connection diagram showing a conventional equalizing wire wiring structure in a rotary electric machine of a type in which equalizing wires are wired in slots.

[Explanation of symbols]

1 York 2 rotor 3 field magnet 4 rotation axes 5 Armature 6 commutator 7 brushes 8 brackets 9 bearings 10 Armature Core 11 conductors 12 windings 13 slots 13a First slot 13b Second slot 14 Commutator piece 14a First commutator element 14b Second commutator piece 15 riser 16 pressure equalization line 16a Pressure equalizing line 16b pressure equalizing line 17 conductors 18a No. 17 teeth 18b No. 18 teeth 18c No. 6 teeth 18d No. 7 teeth 19 Insulation part 20 spacers 21 Engagement protrusion 22 Equalization line mounting groove 25 spacers 26 hooks 27 Equalization line mounting part 51 winding 52 Pressure equalizing line n number of poles

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Claims (6)

[Claims] 1. An armature core having a plurality of slots attached to a rotary shaft and extending in the axial direction of the rotary shaft, a field magnet arranged outside the armature core, and a wire wound around the slot. A winding wire formed, a commutator having a plurality of commutator pieces attached to the rotary shaft adjacent to the armature core, and a pressure equalizing wire connecting the commutator pieces that should have the same potential. In the pressure equalizing wire wiring structure of a rotating electric machine, the pressure equalizing wire is wound around a slot at a position displaced from the commutator element by 360 degrees / n with respect to the number n of poles of the field magnet. A pressure equalizing wire wiring structure for a rotary electric machine, which is connected to another commutator piece. 2. The equalizing wire wiring structure for a rotating electric machine according to claim 1, wherein the equalizing wire is displaced from the first commutator piece by 360 degrees / n with respect to the number n of poles of the field magnet. Is wound around the first slot in the first slot, reaches the end opposite to the commutator, is introduced into the second slot at the opposite position at the end, and is wound around the second slot. In addition, the second slot should have the same electric potential as the first commutator piece located at a position deviated from the end of the second slot on the commutator side by 360 degrees / n with respect to the number n of poles of the field magnet. And a pressure equalizing wire wiring structure for a rotating electric machine, which is connected to the commutator piece. 3. A pressure equalizing wire wiring structure for a rotating electric machine according to claim 1, wherein the number of poles is four. 4. An armature core having a plurality of slots attached to a rotary shaft and extending in the axial direction of the rotary shaft, a winding formed by winding a conductive wire around the slot, and the armature core adjacent to the armature core. A pressure equalizing wire wiring structure for a rotating electric machine, comprising: a commutator attached to a rotating shaft, the commutator having a plurality of commutator pieces; and a pressure equalizing wire connecting the commutator pieces having the same potential. Disposed between the core and the commutator,
A pressure equalizing wire wiring structure for a rotating electric machine, comprising a spacer member made of synthetic resin that insulates the pressure equalizing wire from the rotating shaft. 5. The pressure equalizing wire wiring structure for a rotating electric machine according to claim 4, wherein the spacer member has a pressure equalizing wire mounting portion to which the pressure equalizing wire is hooked. Pressure wire wiring structure. 6. The pressure equalizing wire wiring structure for a rotating electric machine according to claim 1, wherein the pressure equalizing wire is formed of a conductive wire having a wire diameter smaller than that of the winding. A pressure equalizing wire wiring structure for a rotary electric machine, characterized in that the slot is wound before the winding.