JP2015015900A - Stator of rotating electrical machine for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inexpensive stator of a rotating electrical machine for a vehicle, which can enhance a space factor of an electric conductor in a slot, improve power generation efficiency and output torque, suppress damage occurrence of an insulating film of a root portion of a coil end part, and secure electrical insulation.SOLUTION: In a stator of a rotating electrical machine for a vehicle, a stator winding is composed of a distribution winding, slot storage parts 10a, 10a' and root portions of coil end parts 10b are formed in cross-sectionally flat shapes, and the slot storage parts 10a, 10a' are aligned and stored in a slot 5 in a radial direction in contact with each other so that a major side of the cross-sectional flat shape is turned to a peripheral direction. An aspect ratio of the root portion of the coil end part 10b located on the radial-direction outside of the coil end part 10b which is adjacent to the former coil end part 10b in the radial direction and in which a direction extended from the slot 5 in the peripheral direction is different from the former coil end part 10b is smaller than an aspect ratio of the root portion of the coil end part 10b located on the radial-direction inside of the coil end part 10b.

Description

  The present invention relates to a stator of a vehicular rotating electrical machine such as a vehicular AC generator.

  In the conventional stator of a rotating electric machine, the slot accommodating part of the stator winding is formed in a cross-section racetrack shape, and the slot accommodating part is arranged in at least one row in the radial direction with the longitudinal direction of the cross section being in the circumferential direction. Moreover, they are in contact with each other and stored in a slot (for example, see Patent Document 1). By making the slot storage portion into a racetrack shape in cross section, the space factor of the electric conductor in the slot was increased, and the power generation efficiency was improved. In addition, the coil end to which bending and twisting is applied has a circular cross section that is difficult to generate a large bending stress, thereby suppressing deterioration in workability and reliability.

International Publication No. 2004/062065 Pamphlet

  In the invention described in Patent Document 1, the coil end group of the winding unit formed in a cylindrical shape is bent inward in the radial direction, and the winding unit is arranged coaxially with the annular stator core and moved in the axial direction. Then, the slot storage portion is stored in the slot of the stator core, and then the coil end group bent radially inward is returned to the axial direction, and the winding unit is mounted on the stator core. However, the number of winding units corresponding to the number of phases of the rotating electrical machine and the connection specifications is required, and the mounting operation of the winding units is repeatedly performed. At this time, the coil end group of the winding unit mounted on the stator core first hinders the mounting of the subsequent winding unit. Bending process is applied.

  Here, in the stator winding according to the invention described in Patent Document 1, half of the plurality of conductor wires extending from the slot enter another slot that is a predetermined number of slots away from one side in the circumferential direction, and the other half is The winding is configured as a distribution winding that enters another slot separated by a predetermined number of slots on the other side in the circumferential direction. Therefore, when the coil end group of the winding unit attached to the stator core is bent outward in the radial direction, the coil end group on the slot side of the coil end group entering another slot that is a predetermined number of slots away from the slot in the circumferential direction one side. The root portion is pulled to one side in the circumferential direction. On the other hand, the root portion on the slot side of the coil end group entering another slot that is a predetermined number of slots away from the slot in the other circumferential direction is pulled to the other circumferential direction. Thereby, the base part of the coil end adjacent to a radial direction and extending in the direction where a circumferential direction differs is rubbed, and the subject that an insulating film was damaged occurred.

  The present invention has been made in order to solve the above-mentioned problems. The slot housing part of the conductor wire and the root part of the coil end part are formed in a flat cross section, are adjacent to each other in the radial direction, and extend from the slot in the circumferential direction. By changing the flatness of the root part of the coil end part in different directions, the space factor of the electric conductor in the slot can be increased, the power generation efficiency or the output torque can be improved, and the root part of the coil end part An object of the present invention is to obtain a stator for a vehicular rotating electrical machine that can suppress the occurrence of damage to the insulating coating of the vehicle and ensure electrical insulation.

  A stator of a vehicular rotating electrical machine according to the present invention includes a cylindrical core back portion, teeth portions extending radially inward from the inner peripheral surface of the core back portion, and a plurality of teeth portions arranged in the circumferential direction, and A stator core having a plurality of slots defined by the core back portion and the teeth portion, and a stator winding wound around the stator core, the stator winding comprising: A slot accommodating portion accommodated in each of the slots; and a coil end portion that connects ends of the slot accommodating portions accommodated in a pair of the slots separated by a predetermined number of slots. The portion is constituted by a distributed winding extending from each of the slots to both sides in the circumferential direction. The slot accommodating portion and the root portion of the coil end portion connected to the slot accommodating portion are formed in a flat cross section, and the slot accommodating portions are in contact with each other and are accommodated in at least one row in the radial direction and accommodated in the slot. The coil end portion where the flatness of the root portion of the coil end portion located on the radially outer side of the coil end portion, which is adjacent in the radial direction and extends in the circumferential direction from the slot, is located on the radially inner side Smaller than the flatness of the root of

According to the present invention, since the slot storage portion is formed in a flat cross section and is stored in the slot in contact with each other and arranged in a row in the radial direction, the proportion of the electrical conductor in the cross sectional area of the slot is large. Thus, power generation efficiency or output torque can be improved.
The base portion of the coil end portion where the flatness of the root portion of the coil end portion located on the radially outer side of the coil end portion which is adjacent in the radial direction and extends in the circumferential direction from the slot is different is located on the radially inner side. Therefore, it is possible to prevent the corners of the root portions of the coil end portions from interfering with each other. Therefore, the occurrence of tearing of the insulating coating due to the displacement of the root portions of the coil end portions to the opposite sides in the circumferential direction can be suppressed, and the insulation performance can be improved.

It is a perspective view which shows the stator of the rotary electric machine for vehicles which concerns on Embodiment 1 of this invention. It is principal part sectional drawing explaining the slot accommodation state of the stator coil | winding in the stator of the rotary electric machine for vehicles which concerns on Embodiment 1 of this invention. It is the principal part end elevation which looked at the coil end of the stator coil | winding in the stator of the rotary electric machine for vehicles which concerns on Embodiment 1 of this invention from the axial direction outer side. It is process drawing explaining the process of manufacturing the star-shaped winding unit applied to the stator winding | coil in the stator of the rotary electric machine for vehicles which concerns on Embodiment 1 of this invention. It is process drawing explaining the cross-section flattening process of the slot accommodating part of the star-shaped winding unit in the manufacturing method of the stator of the rotary electric machine for vehicles which concerns on Embodiment 1 of this invention. It is a perspective view which shows the distribution winding unit in the manufacturing method of the stator of the rotary electric machine for vehicles which concerns on Embodiment 1 of this invention. It is process drawing explaining the process of mounting | wearing the stator core with the distributed winding unit in the manufacturing method of the stator of the rotary electric machine for vehicles which concerns on Embodiment 1 of this invention. It is a principal part perspective view explaining the movement of the coil end part in the process of mounting | wearing the stator core with the distributed winding unit as a comparative example. It is a principal part perspective view which shows the damage generation | occurrence | production state of the insulating film of the root part of a coil end part in the process of mounting | distributing the distributed winding unit as a comparative example to a stator core. It is the principal part end elevation which looked at the coil end of the stator coil | winding in the stator of the rotary electric machine for vehicles which concerns on Embodiment 2 of this invention from the axial direction outer side. It is the principal part end elevation which looked at the coil end of the stator coil | winding in the stator of the rotary electric machine for vehicles which concerns on Embodiment 3 of this invention from the axial direction outer side.

  Hereinafter, preferred embodiments of a stator of a rotating electrical machine for a vehicle according to the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
1 is a perspective view showing a stator of a vehicular rotating electrical machine according to Embodiment 1 of the present invention, and FIG. 2 is a slot of a stator winding in the stator of the vehicular rotating electrical machine according to Embodiment 1 of the present invention. FIG. 3 is an essential part cross-sectional view for explaining the storage state, and FIG. 3 is an end view of the principal part when the coil end of the stator winding in the stator of the rotating electrical machine for a vehicle according to Embodiment 1 of the present invention is viewed from the outside in the axial direction; 4 is a process diagram for explaining a process of manufacturing a star winding unit applied to a stator winding in a stator of a vehicular rotating electrical machine according to Embodiment 1 of the present invention, and FIG. Process drawing explaining the cross-section flattening process of the slot accommodating part of the star-shaped coil | winding unit in the manufacturing method of the stator of the rotary electric machine for vehicles which concerns on Embodiment 1 FIG. 6: for vehicles which concerns on Embodiment 1 of this invention Distributed winding unit in a method of manufacturing a stator of a rotating electrical machine FIG. 7 is a process diagram for explaining the process of mounting the distributed winding unit on the stator core in the method for manufacturing the stator for a vehicular rotating electrical machine according to the first embodiment of the present invention. FIG. 9 is a perspective view of a main part for explaining the movement of the coil end portion in the process of mounting the distributed winding unit as a comparative example on the stator core, and FIG. 9 is the process of mounting the distributed winding unit as a comparative example on the stator core. It is a principal part perspective view which shows the damage generation | occurrence | production state of the insulation film of the root part of the coil end part in FIG.

  1 to 3, the stator 1 includes a cylindrical stator iron core 2 and a stator winding 7 wound around the stator iron core 2.

  The stator core 2 is manufactured by laminating and integrating magnetic steel plates pressed into a predetermined shape into a cylindrical shape, and extends radially inward from the annular core back portion 3 and the core back portion 3 respectively. The teeth 4 are arranged at a predetermined pitch in the direction, the slots 5 are defined by the adjacent teeth 4, and the flanges 6 are extended from the tip of the teeth 4 to both sides in the circumferential direction. Here, 36 slots 5 are formed in the stator core 2 at equiangular pitches in the circumferential direction. Therefore, in the stator 1, a stator winding 7 composed of one three-phase AC winding is obtained for a rotor (not shown) having 12 magnetic poles. That is, the slots 5 are formed at a rate of 1 per phase per pole. Each tooth portion 4 is formed in a substantially trapezoidal shape in which a cross-sectional shape orthogonal to the axis of the stator core 2 tapers on the inner diameter side, and a cross-sectional shape orthogonal to the axis of the stator core 2 of each slot 5 Is rectangular.

  The stator winding 7 is provided with three-phase distribution windings 8 mounted on the stator core 2 by shifting the slots 5 to be wound one slot at a time. The three-phase distribution windings 8 are AC-connected, for example, Y-connected to form a three-phase AC winding.

  Each distribution winding 8 is formed by winding one conductor wire 10 made of a copper wire coated with an insulating coating in three undulations in the circumferential direction on one side (for example, clockwise) for every three slots, and then continuing. Each of the three slots 5 is wound around the other side in the circumferential direction (for example, counterclockwise) for three turns. And the part accommodated in the slot 5 of the conductor wire 10 is slot accommodating part 10a, 10a ', and the slot accommodating part 10a, 10a' accommodated in the slot 5 which is 3 slots apart is connected to a stator core. A portion of the conductor wire 10 connected on the two shaft end sides is a coil end portion 10b.

  In each slot 5, slot storage portions 10a and 10a 'are stored in contact with each other and arranged in a row in the radial direction. An insulator 11 is mounted in the slot 5, and a wedge 12 is mounted on the opening side of the slot 5.

  The three slot accommodating portions 10a accommodated on the inner peripheral side of each slot 5 are accommodated on one end side in the axial direction of the stator core 2 and on the inner peripheral side of the slot 5 separated by three slots on one side in the circumferential direction. Are connected to the three slot accommodating portions 10a by the coil end portions 10b, respectively, and accommodated at the other end side in the axial direction of the stator core 2 on the inner peripheral side of the slot 5 separated by three slots on the other circumferential side. Each of the three slot storage portions 10a is connected by a coil end portion 10b. Here, as shown in FIG. 3, the coil end portion 10 b is linearly formed between the slot accommodating portions 10 a accommodated in the slots 5 separated by three slots as viewed from the axially outer side of the stator core 2. It is connected.

  The remaining three slot accommodating portions 10a and 10a ′ accommodated on the outer peripheral side of each slot 5 are one end side in the axial direction of the stator core 2 and three slots 5 apart on the other circumferential side. Are connected to the three slot accommodating portions 10a and 10a 'accommodated on the outer peripheral side of each of them by a coil end portion 10b, and are separated by three slots on the other side in the axial direction of the stator core 2, one side in the circumferential direction. The three slot accommodating portions 10a and 10a ′ accommodated on the outer peripheral side of the slot 5 are connected to each other by a coil end portion 10b. Here, as shown in FIG. 3, the coil end portion 10b is formed between the slot accommodating portions 10a and 10a ′ accommodated in the slot 5 separated by three slots when viewed from the axially outer side of the stator core 2. It is connected linearly.

  As described above, in each of the distribution windings 8, half of the conductor wires 10 extending from the respective slots 5 are distributed on both sides in the circumferential direction. In each distribution winding 8, a bundle of three coil end portions 10b is arranged in the circumferential direction at a three-slot pitch. Therefore, on both sides of the stator core 2 in the axial direction, the bundle layers of the coil end portions 10b arranged in the circumferential direction at a three-slot pitch are shifted in one slot pitch in the circumferential direction and arranged in three layers in the radial direction. Thus, coil end groups 7f and 7r of the stator winding 7 are formed.

Next, the cross-sectional shape of the distribution winding 8 which is a feature of the present invention will be described.
The slot storage portions 10a and 10a 'are formed in a racetrack shape in cross section. The coil end portion 10b is formed in a circular cross section except for the root portion connected to the slot accommodating portions 10a and 10a ′. The root portion of the coil end portion 10b connected to the slot accommodating portions 10a and 10a ′ is formed in the same racetrack shape as the slot accommodating portions 10a and 10a ′. The cross-sectional racetrack shape is a shape in which two opposite parallel line segments are connected by an arc.

  As shown in FIG. 2, each slot 5 has six slot storage portions 10a and 10a ′ with the longitudinal direction of the cross-section racetrack shape oriented in the circumferential direction and the long sides in contact with each other in the radial direction. They are stored in rows. Of the six slot accommodating portions 10a and 10a 'accommodated in each slot 5, only the slot accommodating portion 10a' positioned third from the outer peripheral side has a cross-sectional shape with a small flatness. The flatness ratio is obtained by dividing the length of the long side of the cross-section racetrack shape by the length of the short side of the cross-section racetrack shape.

  Next, a method for manufacturing the stator 1 will be described with reference to FIGS.

  First, as shown in FIG. 4, the first winding unit 20A is manufactured by winding one conductor wire 10 in a ring shape three times, and then the second winding unit is wound three times in a ring shape. 20B is produced. Next, the first and second winding units 20A and 20B are bent, and a star pattern is formed in which the ends of the adjacent linear portions 21a are alternately connected by the U-shaped connecting portion 21b on the inner peripheral side and the outer peripheral side. First and second star winding units 21A and 21B, which overlap in three stages, are produced. The conductor wire 10 is formed in a circular cross section having a diameter slightly smaller than the gap between the flange portions 6 of the stator core 2.

  Next, the first and second star winding units 21A and 21B are folded back at the portion of the conductor wire 10 connecting the first and second star winding units 21A and 21B so that the peaks and valleys of the two star patterns overlap each other. The star winding units 22 are produced by superimposing the shape winding units 21A and 21B.

  Next, as shown in FIG. 5, each bundle of the linear portions 21a of the star winding unit 22 is set in a pressure molding machine. That is, the straight portions 21a of each bundle are stacked in a row between a pair of pushers (press plates) 40, and a flat plate-like press plate 41 is interposed between the straight portions 21a. Further, the stopper 42 is mounted between the press plates 41 sandwiching the third straight portion 21a from the bottom.

  Then, a predetermined pressure F is applied to the pair of pushers 40. Thereby, the straight section 21a having a circular cross section is compressed in the pressurizing direction and stretched in the length direction and the direction orthogonal to the pressurizing direction. Since the extending direction of the straight portion 21a is not constrained, the straight portion 21a is formed into straight portions 23a and 23a 'having a cross-sectional racetrack shape. At this time, the press plate 41 sandwiching the third straight portion 21a from the bottom is restricted from being pressed to the straight portion 21a by the stopper 42, and the third straight portion 21a from the bottom has a cross-sectional racetrack shape with a small flatness. It is formed in a straight line portion 23a ′ having. The remaining five straight portions 21a are formed in a straight portion 23a having the same large flat cross section racetrack shape. Next, the star winding unit 22 is removed from the pressure molding machine.

  In FIG. 5, only a pair of pushers 40 is shown, but twelve pairs of pushers 40 are prepared, and the cross-section circular straight portions 21 a of the star-shaped winding unit 22 are subjected to one cross-section flattening step. Are formed in the straight portions 23a and 23a ′ having a cross-sectional racetrack shape. Further, the base portion of the connecting portion 23b is simultaneously formed in the same cross-section racetrack shape as the straight portions 23a and 23a '.

  Next, the star-shaped winding unit 22 is formed into a cylindrical distribution winding unit 23. The distribution winding unit 23 is obtained by winding the conductor wire 10 into a wave winding for 6 turns. Then, as shown in FIG. 6, a bundle of six straight portions 23a and 23a 'is arranged at a three-slot pitch (3P) in the circumferential direction. Further, the six straight portions 23a and 23a 'of each bundle are arranged in a line in the radial direction with the longitudinal direction of the cross section being directed in the circumferential direction. In addition, three bundles of the straight portions 23a and 23a 'are alternately connected at both ends in the axial direction by the connecting portion 23b. Further, the remaining three bundles of the straight portions 23a and 23a 'are alternately connected at both ends in the axial direction by the connecting portion 23b. The connecting portions 23b connecting the three straight portions 23a and 23a 'are opposed in the axial direction.

  Next, the connecting portion 23 b on one end side in the axial direction of the distributed winding unit 23 is bent inward in the radial direction. Then, as shown by the arrows in FIG. 7, the distributed winding unit 23 is disposed coaxially with the stator core 2, and the distributed winding unit 23 is moved in the axial direction so that the axial direction is relative to the stator core 2. Wear from. At this time, a part of the connecting portion 23 b bent radially inward moves in the axial direction through the flange portion 6, and the bundle of the straight portions 23 a and 23 a ′ is drawn into each slot 5. Then, after the bundle of straight portions 23a and 23a 'is completely drawn into each slot 5, the connecting portion 23b bent radially inward is bent back radially outward, and one divided winding unit 23 is fixed. Mounted on the core 2.

  Next, the second distribution winding unit 23 is mounted on the stator core 2 in the same manner, and the third distribution winding unit 23 is mounted on the stator core 2 in the same manner. Next, the connecting portion 23b bent outward in the radial direction of each distribution winding unit 23 is bent back so as to extend in the axial direction, and the stator 1 shown in FIG. 1 is manufactured. At this time, each distributed winding unit 23 is mounted on the stator core 2 by shifting the slot 5 into which the linear portions 23a and 23a 'are inserted by one slot. The distributed winding unit 23 attached to the stator core 2 corresponds to the distributed winding 8. The straight portions 23a and 23a 'correspond to the slot storage portions 10a and 10a', and the connecting portion 23b corresponds to the coil end portion 10b. Then, the stator windings 7 are configured by AC connection, for example, Y connection, of the distribution windings 8 for three phases.

  Here, a problem in the case where the distributed winding unit 23A as a comparative example is mounted on the stator core 2 will be described with reference to FIGS. In the distributed winding unit 23A, the base sides of all the straight portions 23a and the connecting portions 23b are formed in the same cross-section racetrack shape, and the portions other than the base portions of the connecting portions 23b are formed in a circular cross section.

  As with the distributed winding unit 23, the distributed winding unit 23A is bent inward in the radial direction at the connecting portion 23b on one end side in the axial direction and moved in the axial direction, and a bundle of linear portions 23a is inserted into each slot 5. After that, the connecting portion 23b bent radially inward is bent back radially outward, and one distributed winding unit 23A is attached to the stator core 2.

  When the connecting portion 23b of the distributed winding unit 23A is bent back outward in the radial direction, the connecting portion 23b extending from the slot 5 to one side in the circumferential direction, as indicated by an arrow in FIG. The connecting portion 23b that is pulled to the other side and extends from the slot 5 to the other side in the circumferential direction is pulled to the other side in the circumferential direction. As a result, the root portion of the connecting portion 23b located on the outermost periphery extending from the slot 5 to one circumferential direction and the root portion of the connecting portion 23b located on the innermost circumference extending from the slot 5 to the other circumferential side. The portion is displaced to the opposite side in the circumferential direction and rubs against each other. In the worst case, as shown in FIG. 9, the insulating film break 24 occurs at the corner of the base of the connecting portion 23b.

  The process of bending back the connecting portion 23b of the distributed winding unit 23A bent radially outward so as to extend in the axial direction, and further the spring back after extending the connecting portion 23b of the distributed winding unit 23A in the axial direction Sometimes a similar problem arises. The same problem occurs when the vibration of the vehicle is applied to the rotating electrical machine.

  Further, when the slot accommodating portions 10a accommodated in the slots 5 separated by three slots are linearly connected by the coil end portion 10b when viewed from the axially outer side of the stator core 2, The problem becomes noticeable.

  According to the first embodiment, the root portions of the slot accommodating portions 10a and 10a 'and the coil end portion 10b connected to the slot accommodating portions 10a and 10a' are formed in the same cross-section racetrack shape. And the flatness of the root part of the coil end part 10b which adjoins to radial direction and extends in the direction where a circumferential direction differs is mutually different. Therefore, since the corner portions of the root portions of the coil end portions 10b extending in the circumferential direction adjacent to each other in the radial direction are suppressed from interfering with each other, the root portions of the coil end portions 10b are circumferentially connected to each other. Occurrence of the insulating coating tear 24 resulting from the displacement to the opposite side is suppressed, and the insulating performance can be improved.

Further, since the slot accommodating portions 10a and 10a ′ are formed in a cross-section racetrack shape, the proportion of the electric conductor in the cross-sectional area of the slot 5 (space factor) increases. Thus, when the vehicular rotating electrical machine operates as a generator, the efficiency of the generator can be improved, and when it operates as an electric motor, the output torque can be improved.
Further, since the coil end portion 10b is linearly connected between the slot accommodating portions 10a and 10a ′ accommodated in the slots 5 separated by three slots when viewed from the axially outer side of the stator core 2, Compared with the case where the coil end portion is connected between the slot housing portions in an arc shape when viewed from the axially outer side of the stator core, the length of the coil end portion 10b is reduced, the copper loss is reduced, and the power generation efficiency is increased. be able to.

In addition, since the portion excluding the root portion of the coil end portion 10b is formed in a circular cross section, it is difficult for a large bending stress to be generated in the coil end portion 10b to which bending and twisting is applied, thereby suppressing deterioration in workability and reliability. be able to.
In addition, since the six straight portions 21a inserted into the slots 5 of the star winding unit 22 are simultaneously formed in a cross-section racetrack shape, the cross-section in which the straight portions 21a are formed from a cross-section circle to a cross-section racetrack shape. The flattening process is shortened and the productivity of the stator 1 is improved.

  In the first embodiment, the straight portion and the root portion of the coil end portion of the star winding unit configured by shifting the first and second star winding units of three turns in the circumferential direction and overlapping each other are arranged. The bundle is to be flattened at the same time, but the bundle at the root of the straight portion and coil end of the first star winding unit is flattened at the same time, and the straight portion and coil end of the second star winding unit are simultaneously flattened. After the cross section of the bundle of the root part of the part is simultaneously flattened, the first and second star winding units may be shifted in the circumferential direction and overlapped to constitute the star winding unit.

  In the first embodiment, the first and second star winding units are manufactured using one conductor wire. However, each of the first and second star winding units is one. You may produce using the conductor wire of. In this case, the bundle of the straight portion of the first star winding unit and the root portion of the coil end portion is simultaneously flattened, and the bundle of the straight portion of the second star winding unit and the root portion of the coil end portion is simultaneously cut. After flattening, the first and second star winding units may be overlapped to form a star winding unit, and the star winding unit may be formed into a cylindrical distribution winding unit. Also, after forming the first and second star-shaped winding units subjected to the flattening process into cylindrical first and second winding units, respectively, and mounting the first winding unit on the stator core The second winding unit may be attached to the stator core.

In the first embodiment, the root portion of the third coil end portion from the outer peripheral side is formed in a cross-sectional shape with a small flatness, but the root portion of the fourth coil end portion from the outer peripheral side is small. You may form in the cross-sectional shape of flatness.
In the first embodiment, the wedge is attached to the opening of the slot, but the long side of the cross-section racetrack shape of the slot storage portion is longer than the gap between the flanges 6, so the wedge is omitted. May be.

Embodiment 2. FIG.
FIG. 10 is an end view of the main part when the coil end of the stator winding in the stator of the rotating electrical machine for a vehicle according to Embodiment 2 of the present invention is viewed from the outside in the axial direction.

  In FIG. 10, each of the phase windings is such that one conductor wire 10 is wound in three circumferentially on one side in the circumferential direction in three slots 5 in a wavy shape and folded back to the other side in the circumferential direction in slot 5 every three slots. 3 turns in a wavy shape, turn it back and wind it around the slot 5 in every 3 slots for 2 turns in a wavy shape, turn it back and wind it in the slot 5 every 3 slots for 2 turns in a wavy shape on the other side in the circumferential direction It is composed of 10 turns of distributed winding. The root portions of the slot storage portions 10a and 10a 'and the coil end portion 10b connected to the slot storage portions 10a and 10a' are formed in a cross-section racetrack shape. A portion excluding the root portion of the coil end portion 10b is formed in a circular cross section.

In each slot 5, ten slot storage portions 10a and 10a 'are stored in a row in the radial direction with the long sides of the cross-section racetrack shaped in the circumferential direction and the long sides in contact with each other. Yes. Of the ten slot accommodating portions 10a and 10a ′ accommodated in each slot 5, the slot accommodating portions 10a ′ located third and eighth from the outer peripheral side have a cross-sectional shape with a small flatness.
Other configurations are the same as those in the first embodiment.

  Also in the second embodiment, since the flatness of the root portions of the coil end portions 10b that are adjacent to each other in the radial direction and extend in different circumferential directions is different from each other, the same effects as in the first embodiment are obtained. Play.

  In the second embodiment, the phase winding is configured by the 10-turn distributed winding manufactured using one conductor wire, but the outer periphery manufactured using one conductor wire. A phase winding may be constituted by a 6-turn distribution winding on the side and a 4-turn distribution winding on the inner peripheral side produced using another one conductor wire.

  Further, in the second embodiment, a 3-turn wave winding portion extending from the outer periphery side to the circumferential direction one side, and a 3-turn wave winding portion extending from the slot to the other circumferential side portion. The two-turn wave winding portion extending from the slot to one side in the circumferential direction and the two-turn wave winding portion extending from the slot to the other side in the circumferential direction are arranged in this order. The arrangement order in the radial direction of the line portions is not limited to this. For example, a three-turn wave winding portion extending from the outer peripheral side to the circumferential direction one side from the slot, a two-turn wave winding portion extending from the slot to the other circumferential side, and one side in the circumferential direction from the slot May be arranged in the order of a two-turn wave winding portion extending in the direction of a slot and a three-turn wave winding portion extending from the slot to the other side in the circumferential direction.

Embodiment 3 FIG.
FIG. 11 is an end view of the main part when the coil end of the stator winding in the stator of the rotating electrical machine for a vehicle according to Embodiment 3 of the present invention is viewed from the outside in the axial direction.

In FIG. 11, in the slot 5, ten slot accommodating portions 10a, 10a ′ are arranged in a row in the radial direction with the long sides of the cross-section racetrack shape oriented in the circumferential direction and the long sides in contact with each other. It is stored. Of the ten slot accommodating portions 10a and 10a ′ accommodated in each slot 5, the slot accommodating portions 10a ′ located at the third, sixth and eighth positions from the outer peripheral side have a sectional shape with a small flatness. ing.
Other configurations are the same as those in the second embodiment.

  According to the third embodiment, since the flatness of the root portion of the coil end portion 10b is different from each other in all locations that are adjacent in the radial direction and extend in different circumferential directions, the coil end portion Generation | occurrence | production of the tear 24 of the insulating film resulting from the base parts of 10b displacing to the reverse side of the circumferential direction is suppressed more, and insulation performance can be improved further.

In each of the above embodiments, the number of slots is assumed to be 1 per phase per pole, but the number of slots per phase per pole is not limited to 1, and may be 2, for example.
In each of the above embodiments, the root portions of the slot storage portion and the coil end portion are formed in a racetrack shape, but the cross section of the slot storage portion and the root portion of the coil end portion is a racetrack shape. The cross section is not limited to a flat shape, and may be, for example, a rectangular cross section. Moreover, the corner | angular part of a cross-sectional rectangle does not necessarily need to be a right angle, and it is good also considering a corner | angular part as a round shape.

  In each of the above embodiments, the slot storage portion is stored in the slot in contact with each other in a row in a radial direction with the longitudinal direction of the cross-section being flat in the circumferential direction. The number of the storage units arranged in the radial direction is not limited to one row, and the slot storage units need only be aligned in the slots and stored in contact with each other. For example, the storage units are stored in the slots arranged in two rows in the radial direction. May be.

  In each of the above embodiments, the slot storage portion is stored in the slot in contact with each other in a row in a radial direction with the longitudinal direction of the cross-section being flat in the circumferential direction. The storage portions may be stored in the slots in contact with each other in a row in the radial direction with the longitudinal direction of the flat cross section in the radial direction.

In each of the above embodiments, the root portion of the coil end portion connected to the slot storage portion and the slot storage portion has the same cross-sectional shape, but the coil end portion connected to the slot storage portion and the slot storage portion The root portion may have a different cross-sectional shape.
In each of the above embodiments, the coil end portion linearly connects a pair of slot accommodating portions separated by 3 slots as viewed from the axially outer side of the stator core. Alternatively, a pair of slot accommodating portions separated by three slots as viewed from the axially outer side of the stator core may be connected in an arc shape convex outward in the radial direction.

Claims (3)

A cylindrical core back portion is defined by a plurality of teeth portions extending radially inward from the inner peripheral surface of the core back portion and arranged in the circumferential direction, and the core back portion and the tooth portions. A stator core having a plurality of slots,
In a stator of a vehicular rotating electrical machine having a stator winding wound around the stator core,
The stator winding includes a slot accommodating portion accommodated in each of the slots, a coil end portion that connects ends of the slot accommodating portions accommodated in a pair of the slots separated by a predetermined number of slots, And the coil end portion is constituted by a distributed winding extending from each of the slots to both sides in the circumferential direction,
The slot storage part and the root part of the coil end part connected to the slot storage part are formed in a flat cross section,
The slot accommodating portions are accommodated in the slots so as to be in contact with each other and aligned in at least one row in the radial direction;
The flatness of the coil end portion located adjacent to the radial direction and the root portion of the coil end portion located on the radially outer side of the coil end portion having a different direction extending in the circumferential direction from the slot is located on the radially inner side. A stator for a vehicular rotating electrical machine having a lower flatness than a root portion.   The coil end portion linearly connects the end portions of the slot accommodating portions accommodated in the pair of slots separated by a predetermined number of slots as viewed from the axially outer side of the stator core. The stator of a rotating electrical machine for a vehicle according to claim 1.   The stator of the rotating electrical machine for a vehicle according to claim 1 or 2, wherein a portion excluding a root portion of the coil end portion is formed in a circular cross section.

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