JP2011234531A - Distributed winding stator structure using rectangular conductor - Google Patents

Abstract

Disclosed is a distributed winding stator structure and a stator manufacturing method capable of simplifying assembly to a stator core.
In a distributed winding stator 100 including a coil 30 wound with a flat rectangular conductor D and a stator core 20 provided with teeth 21, an inner peripheral first coil 30A1 of the coil 30 and an inner periphery Inner peripheral coil continuous body formed by winding the rectangular conductor D so that the inner peripheral second coil 30A2 wound in the opposite direction to the first side coil 30A1 is continuous via the crossover portion 34A. 30A, the outer periphery side first coil 30B1 of the coil 30, and the outer periphery side second coil 30B2 wound in the opposite direction to the outer periphery side first coil 30B1 are connected so as to be continuous via the crossover portion 34B. An outer peripheral coil continuum 30B formed by winding the conductor D. The outer peripheral coil continuum 30B is disposed on the outer peripheral side of the slot 22 provided in the stator core 20, and the slot 22 On the inner circumference side Circumferential side coil continuum 30A is disposed.
[Selection] Figure 1

Description

  The present invention relates to a distributed winding stator structure using a rectangular conductor, and relates to a technique for improving the space factor by devising a winding method and a connecting method of the rectangular conductor.

An automobile using a motor such as a hybrid car as a driving force requires a small and high output driving motor. In particular, the engine room of a hybrid car is narrow because it requires both an engine and a motor, as well as a device for controlling the motor, and miniaturization and high output of the motor are desired.
In order to reduce the size and increase the output of the motor, it is conceivable to improve the space factor of the coil used for the stator. In order to improve the space factor of the coil, it is conceivable to increase the cross-sectional area of the conductor used in the coil. For this reason, various studies have been made on coils using a rectangular conductor.

Patent Document 1 discloses a technique regarding a method for manufacturing a stator of a motor.
After winding the rectangular conductor a predetermined number of times while bending it into an oval shape, the slot inserts are individually clamped, one is rotated 90 degrees in the direction perpendicular to the winding direction, and the other is rotated 90 degrees on the opposite side. It is rotated to form a twisted portion at the coil end. Then, the in-slot insertion portions are sequentially inserted into the predetermined slots while the twisted portions are arranged substantially in parallel. Then, the terminal part which protrudes to a coil end is couple | bonded with a bus bar, and a stator is completed.
By using a flat conductor for the coil, the space factor of the coil can be improved, and in the step of forming the twisted portion, the twisted portion is inclined in the axial direction of the stator core. This reduces the protruding height of the and contributes to miniaturization of the stator.

Patent Document 2 discloses a technique regarding a rotating electrical machine and a manufacturing method thereof.
The coil assembly is formed into a shape wound from the inner periphery to the outer periphery in a line on the same plane, and is inserted into the stator slot. The coil assembly is disposed so that the terminal portion protrudes from the coil end, and the coils are coupled to each other.
By doing so, it is possible to form a stator that is distributedly wound using coils having substantially the same shape.

Patent Document 3 discloses a technique regarding a rotating electrical machine.
Two in-phase coils wound so as to have a plurality of turns are connected to each other by a jumper, and are mounted in adjacent slots so that a part of the turns formed by the two coils overlap each other. Of the two in-slot conductor portions of each coil accommodated in the slot, the crossover wire connects the conductor wires extending from the innermost coil of the in-slot conductor portion in the overlapping portion at the coil end portion. .

With respect to the connection between the coils, it is possible to reduce the joint portion by adopting a configuration in which a plurality of coils are formed by continuous conducting wires. The connecting wire portions between the pair of coils described above can be shortened, and the coils in phase with the paired coils are connected by forming a separate connecting wire portion.
With such a configuration, it is possible to reduce the joint portion, contribute to the miniaturization of the stator, and suppress the occurrence of joint failure.

Japanese Patent Laid-Open No. 10-066634 JP 2008-125212 A JP 2009-195006 A

However, when forming the stator by the techniques described in Patent Documents 1 to 3, it is considered that there are problems described below.
The techniques described in Patent Literature 1 and Patent Literature 2 both employ a configuration in which coils are joined to each other by a bus bar at the coil end of the stator.
Although the number of slots and the number of coils depend on the design concept, for example, when a stator is formed using 15 coils, according to the techniques described in Patent Document 1 and Patent Document 2, approximately 30 joints are provided. Is required.

If there are many joints in this way, there is an increased possibility that a problem of joint failure will occur regardless of which method such as welding or brazing is used, and it is considered that this will hinder cost reduction, which is not preferable.
On the other hand, according to the method described in Patent Document 3, all the in-phase coils are formed of continuous conductors as described above, so that the number of joints can be reduced.
However, since it is necessary to form two types of crossover sections, a short crossover section and a long crossover section, and the crossover sections need to be crossed due to the structure, it is difficult to assemble the stator core. There is a problem to say.

  Accordingly, an object of the present invention is to provide a distributed winding stator structure and a stator manufacturing method capable of simplifying the assembly to the stator core in order to solve such problems.

In order to achieve the above object, a distributed winding stator according to an aspect of the present invention has the following characteristics.
(1) In a distributed winding stator comprising: a coil wound with a flat conductor; and a stator core disposed on a tooth provided on the inner peripheral side of the coil,
Winding the rectangular conductor so that an inner peripheral first coil of the coils and an inner peripheral second coil wound in a direction opposite to the inner peripheral first coil are continuous via a jumper wire. An inner periphery side coil continuum formed by rotating, an outer periphery side first coil of the coils, and an outer periphery side second coil wound in a direction opposite to the outer periphery side first coil via a jumper wire An outer peripheral coil continuum formed by winding the rectangular conductor so as to be continuous, and the outer peripheral coil continuum is disposed on the outer peripheral side in a slot provided between the teeth of the stator core. The inner peripheral coil continuous body is disposed on the inner peripheral side in the slot.

(2) In the distributed winding stator according to (1),
The inner peripheral coil continuum and the outer peripheral coil continuum are connected in parallel to form a single phase, and the cross-sectional area of the rectangular conductor used for the inner peripheral coil continuum is the outer coil continuous. It is smaller than the cross-sectional area of the said rectangular conductor used for a body, It is characterized by the above-mentioned.

(3) In the distributed winding stator according to (1),
The inner peripheral coil continuous body and the outer peripheral coil continuous body are connected in series to form one phase, and the inner peripheral first coil and the inner peripheral second coil of the inner peripheral coil continuous body. The number of turns of the coil is smaller than the number of turns of the outer peripheral side first coil and the outer peripheral side second coil of the outer peripheral side coil continuum.

In order to achieve the above object, a stator manufacturing method according to an aspect of the present invention has the following characteristics.
(4) In a stator manufacturing method of manufacturing a distributed winding stator by winding a rectangular conductor to create a coil and disposing the coil on a tooth of the stator core,
A first coil in which the flat conductor is wound in the forward direction by flat winding and a second coil wound in the opposite direction, which is continuous with the first coil via a crossover portion, are formed on a coaxial line and coaxially formed. A step of forming a coil continuum, and a conductor portion in the slot inserted into a slot provided in the stator core of the coaxial coil continuum is gripped, and the coaxial coil continuum is widened to expand the inner peripheral coil continuum. Alternatively, the step of forming the outer peripheral coil continuous body, and the in-slot conductor portion of the formed outer peripheral coil continuous body is inserted outside the slot of the stator core, and the inner peripheral coil continuous body The coil for one phase is formed by connecting the inner conductor portion of the slot inside the slot and connecting the arranged inner peripheral coil continuum and the outer peripheral coil continuous body. And the process of Characterized in that it obtain.

With the distributed winding stator according to one aspect of the present invention having such characteristics, the following operations and effects can be obtained.
The aspect of the invention described in the above (1) is a distributed winding stator including a coil wound with a flat conductor and a stator core disposed on a tooth provided on the inner peripheral side. Are formed by winding a rectangular conductor so that the inner circumference side first coil and the inner circumference side second coil wound in the opposite direction to the inner circumference side first coil are continuous via the jumper wire. The outer circumference side coil continuum, the outer circumference side first coil of the coils, and the outer circumference side second coil wound in the opposite direction to the outer circumference side first coil are connected so as to be continuous via the connecting wire. An outer peripheral coil continuum formed by winding a conductor, and an outer peripheral coil continuum is disposed on the outer peripheral side in the slot provided between the teeth of the stator core. An inner peripheral coil continuous body is disposed on the side.

Each of the inner peripheral coil continuum and the outer peripheral coil continuum is formed of a continuous flat rectangular conductor and has a coil corresponding to ½ phase. That is, it becomes a coil for one phase by connecting the inner peripheral coil continuous body and the outer peripheral coil continuous body. By stacking these layers to form a stator, a multi-phase stator can be formed.
That is, since a half-phase coil can be formed by a continuous rectangular conductor, it is possible to reduce the joint portion with the bus bar.

  In addition, each phase is fixed in order because of the configuration in which the inner peripheral side first coil and the inner peripheral side second coil, the outer peripheral side first coil, and the outer peripheral side second coil that are adjacent in the same phase are wound in opposite directions. It can be formed by inserting it into the coil of the child core, and it is not necessary to cross the crossover portions as shown in Patent Document 3, so that it can be assembled to the stator core more easily.

The aspect of the invention described in the above (2) is the distributed winding stator described in (1), wherein the inner peripheral coil continuous body and the outer peripheral coil continuous body are connected in parallel to form one phase. And the cross-sectional area of the said flat conductor used for an inner peripheral coil continuum is formed smaller than the cross-sectional area of the said flat conductor used for an outer peripheral coil continuum.
The cross-sectional area of the rectangular conductor used for the inner peripheral coil continuum is formed to be smaller than the cross-sectional area of the flat conductor used for the outer peripheral coil continuum, and connected in parallel to form one phase. It is possible to reduce the resistance difference. As a result, the circulating current can be reduced.

The inner coil continuum and the outer coil continuum have a cylindrical configuration, and the outer coil continuum is formed by using a rectangular conductor with the same cross-sectional area. In addition, the electrical resistance increases as long as a rectangular conductor is required. Therefore, if they are connected in parallel, a circulating current is generated.
However, by changing the cross-sectional area of the rectangular conductor and reducing the cross-sectional area used for the inner peripheral coil continuum, the difference in electrical resistance between the inner peripheral coil continuum and the outer peripheral coil continuum is reduced. In addition, the generation of circulating current can be suppressed and the output of the stator can be improved.

In the distributed winding stator according to (1), the aspect of the invention described in the above (3) forms one phase by connecting the inner peripheral coil continuous body and the outer peripheral coil continuous body in series. The number of turns of the inner circumference side first coil and the inner circumference side second coil of the inner circumference side coil continuum is less than the number of turns of the outer circumference side first coil and outer circumference side second coil of the outer circumference side coil continuum. Is formed.
By connecting the inner peripheral coil continuous body and the outer peripheral coil continuous body in series to form one phase, the difference in electrical resistance between the inner peripheral coil continuous body and the outer peripheral coil continuous body is not a problem. . As a result, the number of turns of the inner circumference side first coil and the inner circumference side second coil used for the inner circumference side coil continuum is reduced, and the outer circumference side first coil and outer circumference side second coil used for the outer circumference side coil continuum The number of turns can be increased.

By increasing the number of turns of the coil disposed on the outer peripheral side than the coil disposed on the inner peripheral side, it is possible to improve the assembly space.
This is because an inner peripheral coil continuum and an outer peripheral coil continuum are formed by twisting the coil at the coil end, so that an interference problem occurs depending on the shape of the twisted portion. However, this interference can be easily avoided by changing the number of turns. Therefore, the merit which becomes easy to shape | mold the coil end of a stator is acquired.

Moreover, the following operation | movement and an effect are acquired by the stator manufacturing method by one aspect | mode of this invention which has such a characteristic.
The aspect of the invention described in (4) above is a stator manufacturing method in which a flat conductor is wound to create a coil, and the coil is disposed on the teeth of the stator core to manufacture a distributed winding stator. A coaxial coil is formed by forming, on a coaxial line, a first coil in which a flat conductor is wound in a forward direction with a flat winding, and a second coil wound in a reverse direction, which is continuous with the first coil via a crossover portion. A step of forming a continuum, and of the coaxial coil continuum, a conductor portion in the slot to be inserted into a slot provided in the stator core is gripped, and the coaxial coil continuum is widened so that the inner peripheral coil continuum or outer peripheral coil continuity Forming the body, and inserting the in-slot conductor portion of the formed outer peripheral coil continuous body outside the slot of the stator core, and inserting the in-slot conductor portion of the inner peripheral coil continuous body into the slot Insert inside That a step, by connecting the peripheral-side coil continuum and the outer coil continuum among arranged, in which and forming a one-phase coil.

After forming a coaxial coil continuum by flatly winding a rectangular conductor, the inner coil continuum and outer coil continuum to be inserted into the stator core can be easily obtained by holding and deforming the conductor part in the slot. Can be formed.
And since the coil for 1 phase is formed by electrically couple | bonding an inner side coil continuous body and an outer side coil continuous body, it becomes possible to reduce the junction part required for the coil end of a stator.

It is an upper surface schematic diagram of a stator of a 1st embodiment. It is a top view of the coil arrange | positioned at the inner peripheral side of 1st embodiment. It is a top view of the coil arrange | positioned at the outer peripheral side of 1st embodiment. It is sectional drawing at the time of inserting a coil in the stator core of 1st embodiment. It is a top view which inserted only the U phase of the 1st embodiment in the stator. It is a top view which inserted only the V phase of the 1st embodiment in the stator. It is a top view which inserted only the W phase of the 1st embodiment in the stator. It is a perspective view of the coaxial coil continuous body which wound the flat conductor of 1st embodiment. It is an upper surface schematic diagram of the coaxial coil continuous body which wound the flat conductor of 1st embodiment. It is an upper surface schematic diagram of a mode that the coaxial coil continuous body of 1st Embodiment is opened. It is the partial schematic diagram seen from the upper surface of the stator of 1st embodiment. It is a coil connection diagram of the stator according to the first embodiment. It is an upper surface schematic diagram of the stator of 2nd embodiment. It is a coil connection diagram of the stator of the second embodiment. It is coil sectional drawing of the stator of 2nd embodiment.

First, a first embodiment of the present invention will be described.
(First embodiment)
In FIG. 1, the upper surface schematic diagram of the stator of 1st Embodiment is shown.
The stator 100 includes a stator core 20 and a coil 30. The stator core 20 is formed by stacking a plurality of electromagnetic steel sheets punched into a predetermined shape by press working. The stator core 20 is formed in a substantially cylindrical shape, and includes a tooth 21 protruding to the inner peripheral side and a slot 22 disposed between the teeth 21. Although not shown, the insulator 55 is also provided in the slot 22.

FIG. 2 shows a plan view of a coil arranged on the inner peripheral side.
In FIG. 3, the top view of the coil arrange | positioned at the outer peripheral side is shown.
The coil 30 is wound using a rectangular conductor made of a metal having good conductivity such as copper and having an insulating coating around it, and the in-phase coil 30 is continuously formed. FIG. 2 shows an inner peripheral coil continuum 30A, and FIG. 3 shows an outer peripheral coil continuum 30B, each of which forms a ½ phase. The inner periphery side coil continuum 30 </ b> A and the outer periphery side coil continuum 30 </ b> B here refer to a structure in which a plurality of coils 30 are continuously formed.
The inner peripheral coil continuum 30A includes a first slot inner conductor portion 31A and a second slot inner conductor portion 32A. The first slot inner conductor portion 31A and the second slot inner conductor portion 32A are coil ends 33A. It is connected. The coil end 33A is twisted 90 degrees with respect to the first in-slot conductor 31A and the second in-slot conductor 32A.

The inner peripheral side first coil 30A1 and the inner peripheral side second coil 30A2 are connected by a crossover portion 34A. The coil terminal portions 35A are provided at both ends of the inner peripheral coil continuous body 30A.
The inner circumference side first coil 30A1 and the inner circumference side second coil 30A2 are alternately arranged so as to be adjacent to each other in the inner circumference side coil continuous body 30A, and the winding direction of the flat conductor D is different. The inner peripheral first coil 30A1 has a rectangular conductor D wound in a counterclockwise direction, and the inner peripheral second coil 30A2 has a rectangular conductor D formed in a clockwise direction.

The outer peripheral coil continuum 30B has substantially the same configuration as the inner peripheral coil continuum 30A. The outer periphery side first coil 30B1 and the outer periphery side second coil 30B2 are provided, and the first slot internal conductor portion 31B, the second slot internal conductor portion 32B, the coil end 33B, the crossover portion 34B, and the coil terminal portion 35B are provided. . In the following description, when referring to the coil 30 without any particular instruction, one of the inner peripheral side first coil 30A1, the inner peripheral side second coil 30A2, the outer peripheral side first coil 30B1, the outer peripheral side second coil 30B2, or the like, Or all of them.
FIG. 4 shows a cross-sectional view when a coil is inserted into the stator core.
A first slot internal conductor 31A, a second slot internal conductor 32A, a first slot internal conductor 31B, and a second slot internal conductor provided in the inner peripheral coil continuous body 30A and the outer peripheral coil continuous body 30B. 32B is inserted into the slot 22 formed in the stator core 20, and the stator 100 is formed.

An inner peripheral coil continuous body 30 </ b> A is inserted on the inner peripheral side of the slot 22, and an outer peripheral coil continuous body 30 </ b> B is inserted on the outer peripheral side of the slot 22. As shown in FIG. 4, a U-phase inner periphery side coil continuum 30AU and a U-phase outer periphery side coil continuum 30BU are inserted into the slot 22, and a V-phase is a V-phase inner periphery-side coil continuum 30AV and a V-phase outer periphery. Side coil continuum 30 </ b> BV is inserted into slot 22, W-phase inner periphery side coil continuum 30 </ b> AW and W phase outer periphery side coil continuum 30 </ b> BW are inserted into slot 22.
FIG. 5 shows a plan view in which only the U phase is inserted into the stator.
FIG. 6 shows a plan view in which only the V phase is inserted into the stator.
FIG. 7 shows a plan view in which only the W phase is inserted into the stator.

The order in which the inner peripheral coil continuum 30A and the outer peripheral coil continuum 30B are arranged on the stator core 20 is as shown in FIGS. Then, one phase is formed by combining the inner peripheral coil continuous body 30A and the outer peripheral coil continuous body 30B.
Therefore, from the inner peripheral side of the stator core 20, the U-phase inner peripheral coil continuum 30AU, the V-phase inner peripheral coil continuum 30AV, the W-phase inner peripheral coil continuum 30AW, and the W-phase outer peripheral coil continuum 30BW. The U-phase outer periphery side coil continuum 30BU is arranged on the outermost periphery side by side with the V phase outer periphery side coil continuum 30BV, and the inner periphery side coil continuum 30A and the outer periphery side coil continuum 30B are connected.
5 to 7 are drawn separately for each phase for easy understanding, but actually, the state is as shown in FIG.

Next, a method for forming the coil 30 of the first embodiment will be described.
FIG. 8 is a perspective view of a coaxial coil continuous body in which a flat conductor is wound.
FIG. 9 shows a schematic top view of a coaxial coil continuous body in which a flat conductor is wound.
As the rectangular conductor D used in the first embodiment, the rectangular conductor D is thicker in the outer peripheral coil continuous body 30B than in the inner peripheral coil continuous body 30A. The flat conductor D is wound on the same axis with respect to an axis (not shown) to form a coaxial coil continuous body 300.
The coaxial coil continuous body 300 includes a first coaxial coil 301, a second coaxial coil 302, a third coaxial coil 303, a fourth coaxial coil 304, a fifth coaxial coil 305, a sixth coaxial coil 306, The seven coaxial winding coils 307 and the eighth coaxial winding coil 308 are composed of eight coils 30. Adjacent coils, for example, the first coaxial coil 301 and the second coaxial coil 302 are wound in opposite directions as shown in FIG.

Adjacent coils are connected by a connecting wire portion 311. For example, the first coaxial winding coil 301 and the second coaxial winding coil 302 are connected by a first connecting wire portion 311a.
That is, the coaxial coil continuous body 300 starts winding the first coaxially wound coil 301 around the axis (not shown) from the coil terminal portion 35, and rotates clockwise so that the first coaxially wound coil 301 overlaps from the inner periphery to the outer periphery. Then, the second coaxially wound coil 302 is moved to winding via the first crossover portion 311a.
The second coaxially wound coil 302 is formed by winding it in a counterclockwise direction from the inner peripheral direction, and moves to the winding of the third coaxially wound coil 303 via the second crossover portion 311b. In the third coaxial coil 303, a flat winding is formed clockwise as in the first coaxial coil 301. Thereafter, this is repeated, and the coils are alternately wound clockwise and counterclockwise to form eight coils.

FIG. 10 is a schematic top view showing how the coaxial coil continuous body is opened.
The coaxial coil continuous body 300 is spread as shown in FIG. 10 after eight coils of the first coaxial winding coil 301 to the eighth coaxial winding coil 308 are continuously formed.
Specifically, the coaxial coil continuous body 300 is expanded in a state as shown in FIG. 8 while holding the in-slot conductor portion forming portion 315 so as not to rotate with the holder 200. Finally, the coaxial coil continuum 300 is expanded like the inner peripheral coil continuum 30A and the outer peripheral coil continuum 30B shown in FIGS.

Thus, the inner peripheral coil continuous body 30A and the outer peripheral coil continuous body 30B are formed from the coaxial coil continuous body 300, and then the U-phase outer peripheral coil continuous body 30BU is inserted into the stator core 20, V phase outer peripheral coil continuum 30BV, W phase outer peripheral coil continuum 30BW, W phase inner peripheral coil continuum 30AW, V phase inner peripheral coil continuum 30AV are inserted in this order, and finally in the U phase The circumferential coil continuous body 30AU is inserted and installed in the innermost circumference.
The distributed winding stator 100 is formed by joining the coil terminal portions 35A and the coil terminal portions 35B of the respective phases.

FIG. 11 shows a partial schematic view of the stator as viewed from above.
FIG. 11 shows an enlarged view of one slot 22 of the stator 100. FIG. 2 corresponds to FIG. 1 but is an enlarged view.
Thus, from the inner periphery side of the stator 100 to the inner periphery side coil continuum 30A or the outer periphery side coil continuum 30B, the U phase inner periphery side coil continuum 30AU, the V phase inner periphery side coil continuum 30AV, and the W phase. The inner circumferential side coil continuum 30AW, the W phase outer circumferential side coil continuum 30BW, the V phase outer circumferential side coil continuum 30BV, and the U phase outer circumferential side coil continuum 30BU are aligned. U-phase inner periphery coil continuum 30AU, V-phase inner periphery coil continuum 30AV, V-phase inner periphery coil continuum 30AV, W-phase inner periphery coil continuum 30AW, W-phase outer periphery coil continuum 30BW and V Interphase insulating paper (not shown) is inserted between the phase outer periphery side coil continuum 30BV, the V phase outer periphery side coil continuum 30BV, and the U phase outer periphery side coil continuum 30BU, but the W phase inner periphery side coil continuum 30AW. And interphase insulating paper is not required between the W-phase outer peripheral coil continuous body 30BW.

As described above, since it is necessary to sandwich the interphase insulating paper between the coil continuums adjacent in the radial direction, the stator 100 is formed by arranging the coil continuums slightly wider than the width of the slot 22.
Therefore, it is desirable that the aspect ratio of the coil 30 of the inner peripheral coil continuum 30A and the outer peripheral coil continuum 30B is designed to be about 1: 3. Note that the vertical here refers to the length of the long side of the flat conductor D, and the horizontal corresponds to the width of a predetermined number of flat conductors D stacked.

FIG. 12 shows a coil connection diagram of the stator.
The inner peripheral coil continuous body 30A and the outer peripheral coil continuous body 30B used in the stator 100 are connected so as to be connected in parallel as shown in FIG.
As described above, the rectangular conductor D used for the inner peripheral coil continuous body 30A is thinner than the flat conductor D used for the outer peripheral coil continuous body 30B. For this reason, the electrical resistance of the rectangular conductor D used for the outer peripheral coil continuous body 30B is lower, and the electrical resistance of the rectangular conductor D used for the inner peripheral coil continuous body 30A is higher. However, the rectangular conductor D is required to be longer than the inner peripheral coil continuous body 30A by the amount that the outer peripheral coil continuous body 30B is arranged on the outer peripheral side.

  For this reason, when the inner peripheral coil continuum 30A and the outer peripheral coil continuum 30B are connected in parallel, as a result, the electric resistances of the inner peripheral coil continuum 30A and the outer peripheral coil continuum 30B become substantially equal. Designed.

Since the stator 100 of 1st Embodiment is the structure mentioned above, there exists an effect | action and effect which are demonstrated below.
First, the point which can reduce the junction location in a coil end is mentioned.
The stator 100 according to the first embodiment is a distributed winding stator 100 including a coil 30 around which a rectangular conductor D is wound, and a stator core 20 disposed in a tooth 21 provided with the coil 30 on the inner peripheral side. In the coil 30, the inner circumference side first coil 30A1 and the inner circumference side second coil 30A2 wound in the opposite direction to the inner circumference side first coil 30A1 are made continuous via the crossover portion 34A. An inner peripheral coil continuous body 30A formed by winding a rectangular conductor D on the outer periphery, an outer peripheral first coil 30B1 of the coil 30, and an outer peripheral second coil wound in the opposite direction to the outer peripheral first coil 30B1. A coil 30B2 and an outer peripheral coil continuum 30B formed by winding a flat conductor D so that the coil 30B2 is continuous via the crossover portion 34B, and a slot provided between the teeth 21 of the stator core 20 The outer peripheral side in 22 It is disposed outer circumferential side coil continuum 30B, in which the inner circumferential side coil continuum 30A is disposed on the inner peripheral side of the slot 22.

The inner peripheral coil continuum 30A and the outer peripheral coil continuum 30B are each formed of a continuous flat rectangular conductor D and have a coil 30 corresponding to a half phase. That is, the coil 30 for one phase is formed by connecting the inner peripheral coil continuous body 30 </ b> A and the outer peripheral coil continuous body 30 </ b> B at the coil terminal portion 35. By stacking these layers to form the stator 100, a multi-phase stator 100 can be formed.
Since eight coils 30 are used for the inner peripheral coil continuum 30A and the outer peripheral coil continuum 30B, respectively, 16 joint portions are required depending on the joining method. However, by using the inner peripheral coil continuum 30A and the outer peripheral coil continuum 30B, there are two joints per phase, and the joints can be reduced.

As shown in the problem, if there are many joints, there is an increased risk of joint failure, which hinders cost reduction.
However, the stator 100 of the first embodiment can reduce the number of joints by using coils such as the inner peripheral coil continuum 30A and the outer peripheral coil continuum 30B, and can reduce the joints. Therefore, it is possible to reduce the probability of occurrence of bonding failure. This makes it possible to simplify the jig used for joining. In addition, since the yield can be improved, it is possible to contribute to cost reduction as a result.

Moreover, since the phase of the stator 100 can be formed by simply stacking the inner peripheral coil continuous body 30A and the outer peripheral coil continuous body 30B, it is possible to simplify the manufacturing method. It is done.
The inner peripheral coil continuum 30A and the outer peripheral coil continuum 30B are formed such that coils 30 wound in opposite directions are adjacent to each other. In the case of the inner circumference side coil continuous body 30A, the inner circumference side first coil 30A1 and the inner circumference side second coil 30A2 are wound with the rectangular conductor D in the opposite direction, and the inner circumference side second coil 30A2 and the inner circumference side. In the third coil 30A3, the rectangular conductor D is wound in the opposite direction. The same applies to the outer peripheral coil continuous body 30B.

Due to such a configuration, the currents flowing in the coil terminal portions 35 inserted in the adjacent slots 22 in the same phase are in the same direction. Therefore, a predetermined magnetic field can be generated.
Therefore, an electric circuit for generating a predetermined magnetic field can be formed by simply superimposing the inner peripheral coil continuous body 30A and the outer peripheral coil continuous body 30B, and can be used as the stator 100.
That is, when the manufacturing method of the stator 100 as shown in Patent Document 3 is used, a portion where the flat rectangular conductor D crosses between the phases is required. However, in the stator 100 of the first embodiment, this is not necessary, Easy to manufacture.

  Further, in the inner peripheral coil continuous body 30A, the interval between the coils 30 adjacent in the circumferential direction is narrower than that of the outer peripheral coil continuous body 30B. However, since the thickness of the rectangular conductor D is thinner in the inner coil side continuous body 30A than in the outer coil side continuous body 30B, it is easy to avoid mutual interference.

Further, as shown in FIG. 12, the thickness of the rectangular conductor D used for the inner peripheral coil continuum 30A and the outer peripheral coil continuum 30B is changed when connected in parallel. It becomes difficult to generate current.
For this reason, it becomes possible to contribute to the improvement of the output of the stator 100.

Next, a second embodiment of the present invention will be described.
(Second Embodiment)
The second embodiment is similar to the configuration of the stator 100 of the first embodiment, but the arrangement of the inner peripheral coil continuous body 30A and the outer peripheral coil continuous body 30B is different, and the connection method is also different. Also, the form of the stator core is slightly different. Different points will be described below.
In FIG. 13, the upper surface schematic diagram of the stator of 2nd Embodiment is shown.
Unlike the stator 100 of the first embodiment, the U phase, the V phase, and the W phase are arranged in order. That is, from the inner peripheral side of the stator 100, the W-phase inner peripheral coil continuum 30AW, the V-phase inner peripheral coil continuum 30AV, the U-phase inner peripheral coil continuum 30AU, the W-phase outer peripheral coil continuum 30BW, V Phase outer periphery side coil continuum 30BV is arranged, and U phase outer periphery side coil continuum 30BU is arranged on the outermost periphery.

  In addition, the first embodiment uses the stator core 20, whereas the second embodiment uses a split stator core 25. However, the point which laminates | stacks and forms an electromagnetic steel plate does not change. The split stator core 25 includes two teeth 21 on the inner peripheral side, and one slot 22 between adjacent teeth 21. Further, a slot 22 is provided between adjacent split stator cores 25. That is, the split stator core 25 is divided into two at the bottom portion of the slot 22. Although not shown, the split-type stator core 25 is held in a cylindrical shape, and the split-type stator core 25 is held by fitting an outer ring.

FIG. 14 shows a coil connection diagram of the stator.
In the stator 100 of the second embodiment, as shown in FIG. 14, the inner peripheral coil continuous body 30 </ b> A and the outer peripheral coil continuous body 30 </ b> B are connected in series. And the winding number of the outer peripheral side coil continuous body 30B is set more than the inner peripheral side coil continuous body 30A. Specifically, the inner peripheral coil continuous body 30A is formed by winding the flat conductor D four times, and the outer peripheral coil continuous body 30B is formed by winding the flat conductor D six times.

Since 2nd Embodiment is the said structure, there exists an effect demonstrated below.
First, it is possible to suppress interference between the coils 30 at the coil end portion of the stator 100.
In the stator 100 of the second embodiment, the inner peripheral coil continuum 30A and the outer peripheral coil continuum 30B are connected in series to form one phase, and the inner peripheral side of the inner peripheral coil continuum 30A. The number of turns of one coil 30A1 and the inner peripheral side second coil 30A2 is configured to be smaller than the number of turns of the outer peripheral side first coil 30B1 and the outer peripheral side second coil 30B2 of the outer peripheral side coil continuum 30B.

FIG. 15 is a sectional view of the stator coil.
The inner circumferential coil continuum 30A and the outer circumferential coil continuum 30B have different disposition spaces as described above. The inner peripheral coil continuous body 30A is disposed on the inner peripheral side of the stator 100, while the outer peripheral coil continuous body 30B is disposed on the outer peripheral side. Therefore, the circumferential space of the inner peripheral coil continuum 30A is narrower than the circumferential space of the outer peripheral coil continuum 30B.
Since the inner peripheral coil continuous body 30A and the outer peripheral coil continuous body 30B are connected in series as shown in FIG. 14, the number of turns of the inner peripheral coil continuous body 30A and the outer peripheral coil continuous body 30B is changed. However, the problem of circulating current does not occur as in the case of connection in parallel.

Therefore, it is possible to avoid interference between the coils 30 by reducing the number of turns of the inner peripheral coil continuous body 30 </ b> A having a large circumferential width restriction.
The coils 30 adjacent in the circumferential direction are arranged in the adjacent slots 22. Therefore, only the width of the teeth 21 is allowed to bulge between adjacent coils 30. As shown in FIGS. 2 and 3, the possibility that the coil end portion of the coil 30 interferes most on the left and right is increased. This is because the coil 30 is wound flat, and the coaxial coil continuous body 300 is expanded, so that the first in-slot conductor portion 31A, the second in-slot conductor portion 32A, and the coil end 33A are twisted by 90 degrees. It becomes a relationship.

Therefore, the coil end 33A and the first in-slot conductor part 31A, and the coil end 33A and the second slot in-slot part 32A are connected to each other at a corner portion that is swollen by the influence of twisting. This bulge requires a width equal to the thickness of the coil end 33A. The same condition applies to the outer peripheral coil continuous body 30B. FIG. 15 shows a state in which there is a difference in thickness between the inner peripheral coil continuous body 30A and the outer peripheral coil continuous body 30B at the coil end of the stator 100.
In the second embodiment, the inner peripheral coil continuous body 30A and the outer peripheral coil continuous body 30B are connected in series, and the number of turns of the inner peripheral coil continuous body 30A is reduced, thereby reducing the thickness of the coil end 33A. Interference can be avoided.

In the first embodiment as well, the effect of avoiding interference is obtained by changing the thickness of the rectangular conductor D used for the inner peripheral coil continuum 30A and the outer peripheral coil continuum 30B. In this case, since the thickness is determined from the problem of circulating current, it can be said that the stator 100 of the second embodiment can be more easily controlled to avoid interference.
It should be selected appropriately according to the design conditions.

Although the invention has been described according to the present embodiment, the invention is not limited to the embodiment, and by appropriately changing a part of the configuration without departing from the spirit of the invention. It can also be implemented.
For example, in the first embodiment and the second embodiment, the number of turns of the coil 30 and the number of coils 30 used for the inner peripheral coil continuous body 30A and the outer peripheral coil continuous body 30B are specifically shown. It does not prevent you from changing this.

Also, there is no particular limitation on the exemplified materials and selection of whether to use the stator core 20 or the split stator core 25. Furthermore, although the stator 100 using the insulator 55 and interphase insulating paper (not shown) is shown, the insulating paper of the flat conductor D is partially thickened or thickened by a method such as thickening the insulating paper. It does not preclude changes within the scope of design changes such as elimination.
In the first embodiment and the second embodiment, the flat-bending coil 30 is used, but this does not hinder the use of the edge-wise bending coil.

21 Teeth 22 Slot 25 Split type stator core 30 Coil 30A Inner circumference side coil continuum 30A1 Inner circumference side first coil 30A2 Inner circumference side second coil 30A3 Inner circumference side third coil 30B Outer circumference side coil continuum 30B1 1 coil 30B2 outer peripheral side second coil 31A first slot conductor part 31B first slot conductor part 32A second slot conductor part 32B second slot conductor part 34A crossover part 34B crossover part 35 coil terminal part 55 insulator DESCRIPTION OF SYMBOLS 100 Stator 200 Holding | maintenance tool 300 Coaxial coil continuous body 311 Crossover part 311a 1st crossover part 311b 2nd crossover part 315 In-slot conducting wire part formation part D Flat conductor

Claims (4)

In a distributed winding stator comprising: a coil wound with a rectangular conductor; and a stator core disposed on a tooth provided on the inner peripheral side of the coil,
Winding the rectangular conductor so that an inner peripheral first coil of the coils and an inner peripheral second coil wound in a direction opposite to the inner peripheral first coil are continuous via a jumper wire. An inner peripheral coil continuum formed by turning,
Formed by winding the rectangular conductor so that the outer peripheral side first coil of the coils and the outer peripheral side second coil wound in the opposite direction to the outer peripheral side first coil are continuous via a jumper wire. An outer peripheral coil continuous body,
With
The outer peripheral coil continuum is disposed on the outer peripheral side in the slot provided between the teeth of the stator core, and the inner peripheral coil continuum is disposed on the inner peripheral side in the slot. Distributed winding stator characterized by In the distributed winding stator according to claim 1,
The inner peripheral coil continuum and the outer peripheral coil continuum are connected in parallel to form a single phase, and the cross-sectional area of the rectangular conductor used for the inner peripheral coil continuum is the outer coil continuous. A distributed winding stator, characterized in that it is smaller than the cross-sectional area of the rectangular conductor used for the body. In the distributed winding stator according to claim 1,
The inner peripheral coil continuous body and the outer peripheral coil continuous body are connected in series to form one phase, and the inner peripheral first coil and the inner peripheral second coil of the inner peripheral coil continuous body. The distributed winding stator, wherein the number of turns of the coil is smaller than the number of turns of the outer peripheral first coil and the outer peripheral second coil of the outer peripheral coil continuum. In a stator manufacturing method of manufacturing a distributed winding stator by winding a rectangular conductor to create a coil and disposing the coil on a tooth having a stator core,
A first coil in which the flat conductor is wound in the forward direction by flat winding and a second coil wound in the opposite direction, which is continuous with the first coil via a crossover portion, are formed on a coaxial line and coaxially formed. Forming a coil continuum;
Of the coaxial coil continuum, an in-slot conductor portion inserted into a slot provided in the stator core is gripped, and the coaxial coil continuum is expanded to form an inner peripheral coil continuum or an outer peripheral coil continuum. Process,
The formed conductor portion in the slot of the outer peripheral coil continuum is inserted outside the slot of the stator core, and the conductor portion in the slot of the inner peripheral coil continuum is placed inside the slot. Inserting, and
And a step of forming the coil for one phase by connecting the arranged inner peripheral coil continuum and the outer peripheral coil continuum.

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