JP2000184632A - Electric rotating machine and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric rotating machine in which a hardly deformable coil molded body having a deformed cross section or a coil molded body having a large cross section can be wound and placed easily, and to provide its manufacturing method. SOLUTION: A stator core is constituted in such a way that an inside core 1a which comprises outer slots 11 opened to the radial side and teeth 12 used to partition side ends of the outer slots 11 is fitted to an outside core 1b which forms a yoke by bringing its inner circumferential face into contact with end edges on the radial outside of the teeth 12. The slot conductor part 21 of a coil 2 which is housed in the outer slots 1 is composed of a flat conductive coil. The outer slots 11 are featured in such a way that they are tilted to one side in the circumferential direction continuously toward radial-outside slot openings 15 from radial-inside slot bottom parts 16. As a result, a coil can be wound and placed easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wave winding of a rotary electric machine and a method of manufacturing the same.

[0002]

2. Description of the Related Art As a method for winding a stator winding or a rotor winding of a rotating electric machine such as a motor or a generator, a predetermined number of conductors are wound around one magnetic pole, and after the winding is completed, the next magnetic pole is wound. There are known a concentrated winding method and a wave winding method in which a conductor is wound in a wave shape.

[0003]

However, in the case of concentrated winding, since winding is performed for each magnetic pole, it takes a long time to manufacture, and it is not easy to automate the winding operation. Also,
In the case of wave winding, especially when winding a three-phase coil widely used in a rotating electric machine, the coil end overlaps, so that the space of the coil end is increased and the physical size of the rotating electric machine is increased. In addition, the total length of the conductors of the coil ends must be increased, and the winding operation of sequentially inserting the coil conductors from the opening inside the slot radially into the slot requires a circumferential width of the opening inside the slot radial inside. Because of its small size, it is troublesome, and the space factor of the coil conductor in the slot cannot be increased.

[0004] The stator core is divided into a substantially cylindrical inner core having slots and teeth that open radially outward and an outer core that forms a cylindrical yoke that is in close contact with the radial outer edges of the teeth. If an outer slot structure is adopted, in which the outer core is fitted to the inner core in the axial direction after the coil conductor is wound, the wire-shaped thin coil conductors are wound one by one in order. The mounting operation is greatly simplified.

However, in this outer slot method, when a coil conductor formed in advance and having a large cross-sectional area or an irregular cross-sectional area and which is difficult to be bent is wound around the outer slot, there is a problem that the coil winding operation is not easy. Was. This problem will be further described. Consider a one-turn coil conductor composed of a forward conductor portion and a return conductor portion which extend in the axial direction from both ends of one transition conductor portion and are individually accommodated in a pair of slots adjacent to each other.

The circumferential span of the pair of slots is large near the radially outer slot opening and is small near the radially inner slot bottom. Therefore, the circumferential span between the forward conductor and the return conductor of the coil conductor for one turn to be accommodated near the bottom of the slot on the inner side of the radius is
In order to insert the one-turn coil conductor into the slot, it is necessary to expand the circumferential span by deforming the one-turn coil conductor in the circumferential direction. .

However, in the case of a coil having a modified cross-section or a coil having a large cross-section, such as a flat conductor coil wound in such a manner that the main surface extends in the circumferential direction and the axial direction, such a span enlargement operation is performed each time. It ’s not easy,
The winding work was difficult. Furthermore, even if it is a wire-shaped coil with a small cross-sectional area, when many are bundled and formed,
Since there is a problem that the span expansion work becomes difficult, the winding work is difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a rotating electric machine capable of easily winding a coil formed body having a deformed cross section and being difficult to deform or a coil formed body having a large sectional area, and a method of manufacturing the same. Its purpose is to provide.

[0009]

According to a first aspect of the present invention, in the rotating electric machine, the stator core (also referred to as a stator core) has an outer slot that opens radially outward, and teeth that define side ends of the slot. The inner core and the outer core, the inner peripheral surface of which contacts the radial outer edge of the teeth of the inner core and forms a yoke, are fitted to each other. Hereinafter, this type of stator core is also referred to as an outer slot type core.

[0010] The outer slot type core has a slot conductor portion formed of an outgoing conductor portion and a return conductor portion accommodated in the outer slot, and the same side of the outgoing conductor portion and the return conductor portion formed integrally with the slot conductor portion. A coil conductor composed of a transition conductor connecting the ends is wound around a wave winding. This configuration is particularly characterized in that the outer slot is continuously inclined to one side in the circumferential direction from the radially inner slot bottom to the radially outer slot opening.

In this way, even a coil formed body having a deformed cross section that is difficult to deform or a coil formed body having a large cross-sectional area can be extremely easily wound. In addition, since the outer slot type core is employed, the space factor of the coil conductor in the slot can be improved, and the coil can be formed before the slot accommodating step. , The copper loss can be reduced and the physique can be reduced in size.

More specifically, when a coil molded body is formed in advance, the circumferential span between the outgoing conductor portion and the return conductor portion of a one-turn coil continuous to both ends of one transition conductor portion is reduced. The circumferential span, which is determined before being accommodated in the slot, is substantially equal to the circumferential span near the bottom of the slot inside the pair of outer slots that individually house the outgoing conductor portion and the return conductor portion.

Therefore, as described above, if the outer slot is formed radially from the radially inner slot bottom to the radially outer slot opening, the radially outer slot of the pair of outer slots is formed. The circumferential span near the opening will be larger than the circumferential span of the coil compact, which will make it difficult to accommodate the coil compact in the outer slot.

However, in this configuration, since the outer slot is inclined in the circumferential direction from the radially inner slot bottom to the radially outer slot opening, as described later, the one-turn coil going conductor portion is formed. It is possible to easily accommodate the coil molded body in the outer slot while omitting or reducing the operation of enlarging the circumferential span between the return conductor and the return conductor.

According to a second aspect of the present invention, in the rotating electric machine according to the first aspect, one of a pair of side faces of the outer slot facing each other is more inclined to one circumferential side than the other. With this configuration, after one of the forward conductor portion and the return conductor portion of the one-turn coil is accommodated in the outer slot, the other can be accommodated in the outer slot along the greatly inclined side surface. The operation of enlarging the circumferential span between the going conductor portion and the return conductor portion can be further omitted or reduced.

In the rotating electric machine according to the third aspect, in the outer slot type core in which the coil molded body formed in advance is wave-wound, each outer slot has a radially outer side wider than a circumferential width of a radially inner slot bottom. Has a circumferential width of the slot opening. In this way, even a coil formed body having a deformed cross section and having difficulty in deformation or a coil formed body having a large cross-sectional area can be extremely easily wound. In addition, since the outer slot type core is employed, the coil conductor occupying ratio in the slot can be improved, and the coil can be formed before the slot accommodating step.
There is no redundant routing of the coil end of the coil conductor,
The copper loss can be reduced and the size can be reduced.

More specifically, when a coil molded body is formed in advance, the circumferential span between the outgoing conductor portion and the return conductor portion of a one-turn coil that is continuous with both ends of one transition conductor portion is reduced. The circumferential span, which is determined before being accommodated in the slot, is substantially equal to the circumferential span near the bottom of the slot inside the pair of outer slots that individually house the outgoing conductor portion and the return conductor portion.

Therefore, as described above, if the outer slot is formed radially from the radially inner slot bottom toward the radially outer slot opening, the radially outer slot of the pair of outer slots is formed. The circumferential span near the opening will be larger than the circumferential span of the coil compact, which will make it difficult to accommodate the coil compact in the outer slot.

However, in this configuration, since the outer slot has a circumferential width of the slot opening on the radially outer side which is larger than the circumferential width of the slot bottom on the radially inner side, as described later, the one-turn coil conductor The coil molded body can be easily accommodated in the outer slot while omitting or reducing the operation of increasing the circumferential span between the portion and the return conductor portion.

According to a fourth aspect of the present invention, in the rotating electric machine according to the third aspect, the outer slot is continuously inclined to one side in the circumferential direction from the radially inner slot bottom to the radially outer slot opening. It has a radial cross section. With this configuration, the coil winding operation can be further facilitated as already described in the description of the rotating electric machine according to the first aspect.

According to the fifth aspect of the present invention, in the rotary electric machine according to the fourth aspect, one of the pair of side surfaces of the outer slot facing each other is more inclined to one side in the circumferential direction than the other. With this configuration, the coil winding operation can be further facilitated as already described in the description of the rotating electric machine according to the second aspect.

According to a sixth aspect of the present invention, in the rotating electric machine according to any one of the first to fifth aspects, the slot conductor and the crossover conductor are further mounted on the stator core in such a manner that the thickness direction is substantially radial. The transition conductor is formed of an elongated flat conductor whose cross section perpendicular to the extending direction is substantially rectangular. Has a step not less than the thickness of

The coil conductor having this shape is formed in advance, and at least the going conductor portion and the returning conductor portion of the one-turn coil composed of the going conductor portion, the crossing conductor portion, and the returning conductor portion are formed, and then formed into the outer slot. In the case of accommodation, it is difficult to expand and contract the circumferential span of the coil for one turn, but in this configuration, the stator core employs the inclined slot structure according to claim 1 or the narrow bottom slot according to claim 3 as described above. In addition, since the expansion and contraction of the circumferential span between the forward conductor and the return conductor of the one-turn coil during winding can be omitted or reduced, the winding operation can be simplified. Furthermore, in this configuration, since the crossover conductor has a flat conductor configuration having a radial step, it is possible to reduce the coil end length and the volume of the coil end housing space.

Furthermore, the above-mentioned flat conductor type coil having a stepped portion in the transition conductor portion in the radial direction does not expand radially outward at the coil end. Therefore, after the coil is wound around the inner core, the outer core is wound. Since it can be fitted to the inner core in the axial direction, there is an advantage that the coil end does not hinder the assembly of the stator core. In addition, the step can be formed by folding a flat conductor type coil,
It may be formed by plastic deformation.

According to a seventh aspect of the present invention, in the coil winding method for a rotating electric machine according to the sixth aspect, one of the forward conductor portion and the return conductor portion of the one-turn coil of the coil formed body formed in advance is outer. After being accommodated in the slot,
One of the outgoing conductor portion and the return conductor portion of the coil of the turn is pivotally moved about the other as an axis and accommodated in the outer slot. In this way, smooth winding becomes possible.

According to an eighth aspect of the present invention, in the method for manufacturing a rotating electric machine according to any one of the first to seventh aspects, the outer peripheral edge of the tooth or the inner peripheral surface of the outer core closely contacting the outer peripheral edge is further provided. Is subjected to a smoothening treatment by cutting after lamination of the punched electromagnetic steel sheets. Well-known processing techniques such as cutting, grinding, and polishing can be used for this smoothing treatment. However, simply moving the polished surface, which is made by bonding diamond particles with excellent wear resistance, in the circumferential direction or axial direction, It is preferable to perform it.

Thus, the inner core and the outer core can be easily brought into close contact with each other, and the gap between them can be reduced to improve the output.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the following examples. In addition, the above-mentioned meaning that "the outer slot has a radial cross section continuously inclined to one side in the circumferential direction from the radial inner slot bottom to the radial outer slot opening" means at least one of the outer slots. This means that the side surface is inclined to one side in the circumferential direction (the slot conductor receiving side).

The inner core is formed by connecting each tooth at the radially innermost portion thereof, but extends in the circumferential direction from the radially inner end of each tooth in order to reduce leakage magnetic flux not directed to the rotor core. It is preferable that the portion forming the bottom of the slot has a high magnetic resistance particularly in the vicinity of the center of the outer slot in the circumferential direction. Furthermore, in order to obtain the high magnetic resistance, for example, teeth that are individually separated so as to be detachable on the outer peripheral surface of a non-magnetic cylinder or cylinder are arranged in the circumferential direction, and after the winding operation is completed, each tooth is fixed to the outer core. Later, it is possible to remove this non-magnetic cylinder or cylinder.

[0030]

Embodiment 1 An embodiment of a three-phase AC motor employing the rotating electric machine structure of the present invention will be described below. FIG. 1 shows a plan view of a stator of this motor, FIG. 2 shows a front view, and FIGS. Reference numeral 1 denotes a stator core in which thin plate-shaped electrode steel sheets are laminated, and has slots (outer slots) and teeth alternately in the circumferential direction alternately in the circumferential direction as described later. In each slot, a star-connected three-phase two-layer wave-wound stator coil (hereinafter, also simply referred to as a coil) 2 is wound. An insulator 3 for insulating the coil 2 and the core 1 from each other is inserted into the inner periphery of the slot.

The coil 2 has a linear slot conductor 21 inserted into the slot, and a transition conductor 22 formed integrally with the slot conductor 21.
Are individually connected to the same ends of a pair of slot conductors 21 inserted into slots on both sides sandwiching two slots. The coil 2 is composed of three phase coils 2a, 2b and 2c as shown in FIG.
As shown in FIG. 3, the starting conductor 21a extending in the traveling direction away from the starting ends 23 to 25 of the phase coils 2a, 2b, 2c, and the starting end 2 of the phase coils 2a, 2b, 2c.
And a return conductor portion 21b extending in the return direction approaching as viewed from 3 to 25. Therefore, the coil ends 2d on both sides of the slot are, to be precise, composed of the end portions on both sides of the slot conductor portion 21 and the transition conductor portion 22.
As shown in FIG. 1, is bent obliquely in the circumferential direction with respect to the slot conductor 21, is bent at the center of the crossover conductor 22, and has a mountain shape at its axial end.

More specifically, each of the bent ends 22a is overlapped by being radially folded and overlapped at the axial end. Therefore, the folding of the axial end portion 22a of the crossover conductor portion 22 imparts a radial displacement equal to the thickness to the pair of slot conductor portions 21 extending from both ends of the crossover conductor portion 22. Since this axial end portion 22a of the crossover conductor portion 22 does not overlap with the adjacent crossover conductor portion 22 in the radial direction, the bending in the radial direction or the provision of the step can be performed without any trouble.

Hereinafter, the coil 2 will be described in more detail. As shown in FIG. 3, the coil 2 has six coil conductors 201 to 201 arranged in parallel at a distance of one slot pitch.
206, and the coil conductors 201 and 204 are the phase coils 2
a, and the coil conductors 203 and 206 are phase coils 2b
And the coil conductors 202 and 205 constitute the phase coil 2c. Each of the coil conductors 201 to 206 has a substantially rectangular cross-sectional shape that is thin in the radial direction of the stator core 1 and wide in the circumferential direction.

The n-th (n is an integer) slot conductor portion of the m-th (m is an integer) coil conductor is the m-th (m is an integer) coil conductor.
The first coil conductor is accommodated in a slot 180 electrical degrees away from the slot in which the (n-1) -th or (n + 1) -th slot conductor portion 21 is accommodated, that is, a slot separated by a 3-slot pitch. In addition, in the slots separated by the pitch of three slots, the (m−3) th or the (m +) th
It is housed together with the slot conductor portion 21 of the third coil conductor.

Further, among the starting ends of the six coil conductors 201 to 206, the second, fourth, and sixth starting ends are short-circuited to each other to be a neutral point, and the remaining first, third, and fifth starting ends are set to three. Terminals of the phase coils 2a, 2b, 2c connected in a phase star configuration. A specific method for manufacturing the coil conductors 201 to 206 will be described with reference to the manufacturing procedure shown in FIGS.

First, as shown in FIG. 3, six coil conductors 201 to 206 are arranged in parallel at a distance of one slot pitch. The slot conductor portion 21 and the transition conductor portion 22 are each formed in a linear band shape, and the transition conductor portion 22 has an appropriate angle (here, about 60
Degrees). 23 is a coil conductor 201
24 is a starting end of the coil conductor 203;
Reference numeral 25 denotes a start end of the coil conductor 205, 26 denotes a start end of the coil conductor 202, 27 denotes a start end of the coil conductor 204, and 28 denotes a start end of the coil conductor 206.

Next, as shown in FIG.
The first six transition conductors 22 counted from the starting ends 23 to 28 of the first to second 206 are positioned at the center (indicated by a broken line in FIG. 3) so that the first slot conductor 21 is located below (by valley folding). )
Bend. In FIG. 3, each coil conductor 201
The first slot conductor portion 21 and the next slot conductor portion 21 counted from the starting ends 23 to 28 of the first to third slot conductors 206 to 206 are formed at a pitch of three slots apart from each other.
The second slot conductor 21 of the coil conductor 202 overlaps the first slot conductor 21 of the coil conductor 205, and so on. On top of
The second slot conductor 21 of the coil conductor 203 overlaps the first slot conductor 21 of the coil conductor 206.

Next, as shown in FIG.
At the center (shown by a broken line in FIG. 4), the sixth six transition conductors 22 counted from the start ends 23 to 28 of the first to second 206 are shown.
The second slot conductor 21 is folded over the third slot conductor 21 (by mountain fold, that is, in the same rotation direction as the first folding direction in the present invention).
As a result, the third slot conductor 21 of the coil conductor 201 becomes the second slot conductor 21 of the coil conductor 204.
, And similarly, the third slot conductor 21 of the coil conductor 202 overlaps the second slot conductor 21 of the coil conductor 205, and the third slot conductor 21 of the coil conductor 203 The conductor 206 overlaps below the second slot conductor 21. As a result, the third slot conductor 21 is accommodated at the same depth (the deepest position) within the slot as the first slot conductor 21 without difficulty.

Hereinafter, as shown in FIG.
By folding in the same rotation direction as the mountain fold and the valley fold, six coil conductors 201 to 206 are provided in each slot.
Housed in layers. As a result, the coil conductors 201 to 201 are bent by the number of times obtained by subtracting 1 from the number of rotor magnetic poles.
The coil 206 makes one round, and a coil for two turns is formed in two layers in the slot.

Next, as shown in FIG. 7, the sheet is folded in the direction opposite to the conventional rotation direction (ie, since the last bending of the first two turns is a valley fold, the valley fold is performed again). Thus, the subsequent slot conductor 21 can be smoothly arranged in the third and fourth layers in the slot. Subsequently, as shown in FIG. 8, the six coil conductors 201 to 206 are placed in each slot by bending in the same rotation direction as the first two turns such as valley fold, mountain fold, and valley fold.
Housed in layers. As a result, each coil conductor 2 is bent again by the number of times obtained by subtracting 1 from the number of rotor magnetic poles.
01 to 206 perform the next round, and coils for four turns are formed in four layers in the slot. Hereinafter, the required number of turns is produced in the same procedure as described above.

Next, after a predetermined turn is made, as shown in FIG. 8, the final crossover conductor portion 22b of the coil conductors 201 to 206 is about half as long as the previous crossover conductor portion 22. Further, the final transition conductor portion 22b of each of the coil conductors 204 to 206 is obliquely arranged in a line symmetrical direction with the other transition conductor portions 22 and the final transition conductor portion 22b. As a result, as shown in FIG. 10, the end portions of the final crossover conductor portions 22b of the coil conductors 201 and 204 overlap, and the coil conductor 2
02 and 205, the leading end portions of the final transition conductor portions 22b overlap, and the final transition conductor portions 22b of the coil conductors 203 and 206 overlap.
Are overlapped, and by welding these overlapping portions, a three-phase stator coil is formed. More specifically, as shown in FIG.
01 to 203, and then the coil conductors 204 to 206 are bent as shown in FIG.
What is necessary is just to form the said overlap and to weld.

Next, the coil 2 manufactured as described above is inserted into each slot of the stator core 1. Next or before the slot insertion, the coil conductors 202, 204, 2
06 is short-circuited to the neutral point. (Structure of Stator Core) Next, the stator core 1 on which the three-phase stator coil 2 manufactured as described above is wound.
Will be described below with reference to FIG.

The stator core 1 has an inner core 1a in which outer slots 11 that open radially outward and teeth 12 that project radially outward are alternately provided at a constant pitch in the circumferential direction. An outer core 1b formed by laminating electromagnetic steel plates is formed of a cylindrical outer core 1b which is in contact with a radially outer edge to form a yoke. Have been.

Each of the outer slots 11 accommodates a slot conductor 21 of the coil 2 wound in a radial direction and stacked in the radial direction. Cylindrical portion 1 inside diameter of inner core 1a
3 has a concave portion 14 for reducing leakage magnetic flux from the outer slot 11 side (radially outer side) adjacent to the circumferential center of the slot bottom of the outer slot 11. The concave portion 14 may be omitted, and this portion may be demagnetized by changing the crystal structure of the inner core 1a by laser heating or the like, or the cylindrical portion 13 near the concave portion 14 of the inner core 1a may be demagnetized similarly. Good.

The feature of this outer slot type core is that the outer slot 11 and the teeth 12 are inclined counterclockwise in FIG.
The circumferential width of one slot opening 15 is the outer slot 1
The point is that it is formed wider than the circumferential width of one slot bottom 16. More specifically, the side face 17 of the tooth 12 on the clockwise delay side in FIG.
2 is inclined (turned down) in the circumferential direction more than the side surface 18 on the clockwise advance side in FIG. That is, the outer slot 11 has an inclined slot shape and a narrow bottom slot shape as described above. Therefore, the circumferential width of the slot bottom portion 16 of the outer slot 11 is substantially equal to the circumferential width of the slot conductor portion 21, and the circumferential width of the slot opening 15 of the outer slot 11 is wider than that. Note that the circumferential width of the tooth 12 is substantially equal in each radial portion, thereby avoiding magnetic saturation of the tooth 12 near the outer edge of the tooth 12.

(Coil Winding Step) The forward conductor 21 a and the return conductor 2 forming the slot conductor 21 of the coil 2
The winding operation for accommodating 1b in the outer slot 11 will be described with reference to FIG. However, in the three-phase coil 2, it is assumed that a total of six coil conductors 201 to 206 sequentially accommodated in adjacent slots are formed in a single row as shown in FIG.

In FIG. 12, first, the first outgoing conductor portion 21a of the coil conductor 201 is inserted into the left outer slot 11.
To accommodate. The first outgoing conductor portion 21 a of the coil conductor 201 falls from the slot opening 15 to the slot opening 6 in a substantially circular locus along the inclination of the outer slot 11.
The other coil conductors 202 to 205 approaching at the same time as the drop of the coil conductor 201 and moving close to the slot opening 15 of the outer slot 11 in which the coil conductor 201 is to be accommodated by making a substantially circular motion in the direction of the arrow shown in FIG. .

The hatched rectangular cross section in FIG. 12 indicates the first outgoing conductor portion 21a of the coil conductors 201 to 205 when the first outgoing conductor portion 21a of the coil conductor 201 has landed on the slot bottom 16 (stage 1).
And the position of the return conductor portion 21b of the coil conductors 201 and 202. Next, these coil conductors 201 to 206 are further added.
Is further rotated so that the first outgoing conductor portion 21a of the coil conductor 202 is landed on the slot bottom 16 (stage 2). Coil conductor 2 from stage 1 to stage 2
The rotation of the coil conductors 201 to 206 is performed about the first going conductor 21a of the coil conductor 201 as a central axis.
Can be considered as a trajectory for rotating.

Accordingly, of the side surfaces 17 and 18 of the outer slot 11, while the coil conductors 201 to 206 rotate from the stage 1 to the stage 2, the coil conductor 201
It is preferable that the portion through which through 206 pass has a substantially arc shape with the first going conductor portion 21a of the coil conductor 201 as a central axis. Similarly, the side 1 of the outer slot 11
7 and 18, the coil conductors 201 to 206 are rotated from the stage 2 to the stage 3 while the coil conductors 201 to 206 are rotated.
It is preferable that a portion through which 206 passes is formed in a substantially arc shape having the first going conductor portion 21a of the coil conductor 202 as a central axis. Similarly, the side 1 of the outer slot 11
7 and 18, the coil conductors 201 to 206 are rotated from the stage 3 to the stage 4 while the coil conductors 201 to 206 are rotated.
It is preferable that the portion through which 206 passes is formed in a substantially arc shape having the first going conductor portion 21a of the coil conductor 203 as a central axis. In this way, the preferred shape of both side surfaces 17, 18 of the outer slot 11 can be determined.
Note that the teeth 12 defined by the side surfaces 17 and 18
Is preferably set to have a constant value t in a direction perpendicular to the magnetic flux passing direction.

After all, in the vicinity of the slot opening 15, the side face 1
The curvature of the side 7 becomes larger than the curvature of the side face 18, and the side face 17 is inclined more greatly in the radial direction than the side face 18. The forward conductor 21a or the return conductor 21b of the coil conductors 201 to 206 arriving on the slot bottom 16 or the previously accommodated coil conductor extends in a direction substantially perpendicular to the rotation locus immediately after arrival. Therefore, it is plastically deformed so as to be parallel to the slot bottom 16. This state is shown in FIG. A margin is provided between the teeth 12 and the coil conductors 201 to 206 accommodated in the outer slot 11 so that the insulator can be inserted. (Modification) In the above embodiment, the outer peripheral edge 19 of the teeth 12 of the inner core 1a (see FIG. 13) and the inner peripheral surface of the outer core 1b which is in close contact therewith are formed in an arc or a circle. By doing so, it is possible to reduce the magnetic resistance of the minute air gap between them and reduce iron loss.

Preferably, the radial outer edge 19 of the tooth 12 has a concave portion that is depressed radially inward in a radial cross section, and a protrusion that closely contacts the concave portion is provided on the inner peripheral surface of the outer core 1b. Is preferred. In this way, the magnetic flux flowing through the outer core 1b in the circumferential direction does not cross the minute air gap, so that iron loss can be reduced. (Modification) In the above embodiment, the outer peripheral edge 19 of the teeth 12 of the inner core 1a (see FIG. 13) and the inner peripheral surface of the outer core 1b which is in close contact therewith are coil conductors 201-201 after the electromagnetic steel sheets are laminated. Prior to winding 206, the surface is smoothened by polishing or cutting.

This makes it possible to achieve a smooth fit between the two despite the small gap, and to achieve both easy work and reduced iron loss. (Modification) In the above embodiment, a step in the radial direction is formed at the transition conductor portion 22 by bending. However, this step may be formed by plastically deforming the tip end of the transition conductor portion 22 and the like. (Modification) In the above embodiment, the outer slot 1
The shapes of the side surfaces 17 and 18 of the first coil are not limited to the above shapes, and may be appropriately changed within a range where the coil conductors 201 to 206 can be easily wound.

[Brief description of the drawings]

FIG. 1 is a plan view of a stator in an embodiment of a three-phase motor in which a wave winding of the present invention is applied to a stator winding.

FIG. 2 is a front view of the stator shown in FIG.

FIG. 3 is a process diagram showing a procedure for producing the stator coil shown in FIGS. 1 and 2;

FIG. 4 is a process diagram showing a procedure for producing the stator coil shown in FIGS. 1 and 2;

FIG. 5 is a process chart showing a procedure for producing the stator coil shown in FIGS. 1 and 2;

FIG. 6 is a process diagram showing a procedure for producing the stator coil shown in FIGS. 1 and 2;

FIG. 7 is a process chart showing a procedure for producing the stator coil shown in FIGS. 1 and 2;

FIG. 8 is a process diagram showing a procedure for producing the stator coil shown in FIGS. 1 and 2;

FIG. 9 is a process diagram showing a procedure for producing the stator coil shown in FIGS. 1 and 2;

FIG. 10 is a process diagram showing a procedure for producing the stator coil shown in FIGS. 1 and 2;

FIG. 11 is a radial cross-sectional view of a stator core.

FIG. 12 shows coil conductors 201 to 20 to inner core 1a.
6 is a partial cross-sectional view with a trajectory showing the insertion operation of No. 6.

FIG. 13 is a partial sectional view with a trajectory showing a process of correcting the attitude of the coil conductor 201 accommodated in the outer slot 11.

[Explanation of symbols]

1 is a stator core, 1a is an inner core, 1b is an outer core, 2
Is a coil, 11 is an outer slot, 12 is a tooth,
15 is a slot opening of the outer slot 11, 16 is a slot bottom of the outer slot 11, 17 and 18 are side surfaces of the outer slot 11, 19 is a radial outer edge of the tooth 12, 21 is a slot conductor, and 22 is a crossover conductor.

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) PP13 PP14 QQ03 QQ12 QQ27 RR01 SS04 SS05 SS08 SS16 SS19 SS24 TT04

Claims (8)

[Claims] 1. An inner core having a plurality of outer slots opening radially outward at a predetermined slot pitch, and an outer core having an inner peripheral surface abutting against radially outer edges of teeth of the inner core to form a yoke. A stator core having a forward conductor portion and a return conductor portion inserted into the outer slot, and a same-side end of the forward conductor portion and the return conductor portion formed integrally with the slot conductor portion and connected to each other. In the rotating electric machine provided with a wave winding formed by wave winding a coil conductor having a transition conductor portion, each of the outer slots continuously extends in a circumferential direction from a radially inner slot bottom to a radially outer slot opening. A rotating electric machine having a radial cross section inclined to one side. 2. The rotating electric machine according to claim 1, wherein one of a pair of side faces of the outer slot facing each other is more greatly inclined to one side in the circumferential direction than the other. 3. An inner core having a plurality of outer slots opening radially outward at a predetermined slot pitch, and an outer core having an inner peripheral surface abutting against radially outer edges of teeth of the inner core to form a yoke. A stator core having a forward conductor portion and a return conductor portion inserted into the outer slot, and a same-side end of the forward conductor portion and the return conductor portion formed integrally with the slot conductor portion and connected to each other. In the rotating electrical machine having a wave winding formed by wave winding a coil conductor having a transition conductor portion, each of the outer slots has a circumference of a radially outer slot opening wider than a circumferential width of a radially inner slot bottom. A rotating electric machine having a width in a direction. 4. The rotating electric machine according to claim 3, wherein the outer slot has a radial cross section that is continuously inclined to one side in a circumferential direction from a radially inner slot bottom to a radially outer slot opening. Characteristic rotating electric machine. 5. The rotating electric machine according to claim 4, wherein one of a pair of side surfaces of the outer slot facing each other is more inclined to one side in the circumferential direction than the other. 6. The rotating electric machine according to claim 1, wherein the slot conductor and the crossover conductor are wound around the stator core in a direction in which a thickness direction thereof is substantially a radial direction, and extend in an extending direction. And a cross section perpendicular to the rectangular conductor is substantially rectangular, and the transition conductor portion has a portion on the side of the outgoing conductor portion and a portion on the side of the return conductor portion in a radial direction having a thickness of the long flat plate conductor. A rotating electric machine having the above steps. 7. The method for manufacturing a rotating electric machine according to claim 6, wherein one of the forward conductor and the return conductor of the one-turn coil of the coil formed in advance is accommodated in the outer slot, and then the one turn is formed. A method of manufacturing the rotating electric machine, wherein one of the outgoing conductor portion and the return conductor portion of the coil is pivotally moved around the other with the other being accommodated in the outer slot. 8. The method for manufacturing a rotary electric machine according to claim 1, wherein the outer peripheral edge of the tooth or the inner peripheral surface of the outer core that is in close contact with the outer peripheral edge of the tooth is electromagnetically punched. A method for manufacturing a rotating electric machine, wherein a smoothening treatment is performed after lamination of steel plates.