JP2019140710A - Stator of rotary electric machine - Google Patents

Abstract

To provide a stator of a rotary electric machine, which can be miniaturized, secures mechanical strength of jointing parts at coil ends and can suppress occurrence of a fatigue failure of the jointing parts.SOLUTION: First coil end parts of coil segments where radial positions of straight parts inserted into a pair of slots detached by six slots differ by one straight part are connected, second coil end parts of the coil segments where radial positions of straight parts inserted into a pair of slots detached by six slots differ by one straight part are connected, and the plurality of coil segments are connected. Four jointing parts of the first coil end parts are arranged in a line in a radial direction by alternately changing heights in an axial direction, and are arrayed in a circumferential direction at one slot pitch, and, four jointing parts of the second coil end parts are arranged in a line in the radial direction by alternately changing the heights in the axial direction and are arrayed in the circumferential direction at one slot pitch.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a stator of a rotating electrical machine.

  A stator of a rotating electrical machine includes a stator core and a stator coil. The stator coil winding method includes a concentrated winding method in which a conductor wire is wound around each magnetic pole, and a distributed winding method in which a conductor wire is wound around a pair of magnetic poles straddling a plurality of magnetic poles. Since the distributed winding method has a smoother distribution of the rotating magnetic field than the concentrated winding method, the effect of reducing vibration during operation of the rotating electrical machine can be obtained. On the other hand, in the coil end of the stator coil configured by the distributed winding method, since the joint portions of the conductor wires overlap in the radial direction, it is necessary to secure a gap between the joint portions. As a result, the radial dimension of the coil end increases, and the rotating electrical machine cannot be reduced in size.

  In view of such a situation, the end of the conductor wire that becomes the joint is cut out, and the cross-sectional area of the cut-out part is made smaller than the cross-sectional area of other parts, and the increase in the cross-sectional area of the joint is suppressed. A method for joining wires has been proposed (see, for example, Patent Document 1). As a result, an increase in the radial dimension of the coil end is suppressed, and a reduction in the size of the rotating electrical machine is realized.

Japanese Patent No. 3303854

  However, in the method for joining conductor wires according to Patent Document 1, the cross-sectional area of the notch at the end of the conductor wire is smaller than the cross-sectional area of other portions. As a result, the mechanical strength of the joint becomes relatively smaller than the mechanical strength of other parts. As a result, when a rotating electrical machine is used in an environment where large vibrations and impacts exceeding the mechanical strength of the joint act, there is a problem that the joint of the coil end causes fatigue failure.

  The present invention has been made in order to solve such a problem, and can be downsized and ensure the mechanical strength of the joint portion at the coil end to prevent fatigue fracture of the joint portion. The object is to obtain a stator of a rotating electrical machine that can be suppressed.

A stator of a rotating electrical machine according to the present invention includes an annular stator core in which a plurality of slots having a radial direction in the slot depth direction are arranged in the circumferential direction, and a plurality of coil segments inserted into each of the slots. . The plurality of coil segments respectively include a straight portion inserted into the slot, a first coil end portion extending from one end of the straight portion to one side in the axial direction of the slot, and the other end of the straight portion. A second coil end portion extending to the other side in the axial direction of the slot, and 2 m of the linear portions are inserted in each of the slots in a line in the radial direction (where m is An integer of 2 or more). The first coil end portions of the coil segments that are inserted in one slot and a slot that is spaced apart from the one slot by a plurality of slots in the circumferential direction differ in the radial position of the straight portion by one straight portion. Coil segments that are connected and that are inserted in the one slot and a slot that is circumferentially separated from the one slot by the plurality of slots differ in the radial position of the linear portion by one linear portion. The second coil end portions are connected to each other, the plurality of coil segments are connected to each other, and the joint portions of the first coil end portions are alternately arranged in the radial direction by changing the height in the axial direction alternately. Are arranged in the circumferential direction and the joint portions of the second coil end portions are alternately changed in height in the axial direction, and m in a row in the radial direction, or (m−1) Lined up, circumferential direction It is arranged.

  According to the present invention, the joint portions of the first and second coil end portions are arranged in a line in the radial direction, with the axial heights alternately changed. As a result, the joints that increase in the radial dimension do not overlap in the radial direction, and an increase in the radial dimension of the coil end is suppressed, thereby reducing the size of the rotating electrical machine. Furthermore, the mechanical strength of the joint is ensured, and the occurrence of fatigue failure at the joint is suppressed.

It is a longitudinal cross-sectional view which shows the rotary electric machine which concerns on Embodiment 1 of this invention. It is a cross-sectional view which shows the principal part of the stator of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows the principal part of the stator of the rotary electric machine which concerns on Embodiment 1 of this invention. It is an expanded view which shows the stator of the rotary electric machine which concerns on Embodiment 1 of this invention. It is an expanded view explaining the method of inserting the coil segment in the stator of the rotary electric machine which concerns on Embodiment 1 of this invention in a stator core. It is a longitudinal cross-sectional view which shows the state by which the coil segment in the stator of the rotary electric machine which concerns on Embodiment 1 of this invention is inserted in the 1st to 4th layer of a slot. It is an expanded view which shows the state which connected the coil end parts of the coil segment inserted in the 1st layer of the slot in the stator of the rotary electric machine which concerns on Embodiment 1 of this invention from the 4th layer. It is a longitudinal cross-sectional view which shows the state which connected the coil end parts of the coil segment inserted in the 1st layer of the slot in the stator of the rotary electric machine which concerns on Embodiment 1 of this invention from the 4th layer. It is a longitudinal cross-sectional view which shows the state by which the coil segment in the stator of the rotary electric machine which concerns on Embodiment 1 of this invention is inserted in the 1st-8th layer of a slot. It is an expanded view explaining the method to insert the coil segment group in the stator of the rotary electric machine which concerns on Embodiment 1 of this invention from the 1st layer of a slot to the 4th layer. It is an expanded view which shows the state bent to the coil segment group inserted into the 4th layer of the slot in the stator of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows the principal part of the stator of the rotary electric machine which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
1 is a longitudinal sectional view showing a rotating electrical machine according to Embodiment 1 of the present invention. FIG. 2 is a transverse sectional view showing a main part of a stator of the rotating electrical machine according to Embodiment 1 of the present invention. These are the longitudinal cross-sectional views which show the principal part of the stator of the rotary electric machine which concerns on Embodiment 1 of this invention, FIG. 4 is an expanded view which shows the stator of the rotary electric machine which concerns on Embodiment 1 of this invention. In addition, a longitudinal cross-sectional view is a figure which shows the cross section in the plane containing the axial center of a rotating shaft. A transverse cross-sectional view is a diagram showing a cross section in a plane orthogonal to the axis of the rotation axis. The developed view is a plan view of a main part when the stator core is developed in a straight line when viewed from the inner diameter side. In FIG. 2, the insulator is omitted for convenience.

  In FIG. 1, a rotating electrical machine 100 includes a housing 1 having a bottomed cylindrical frame 2 and a bracket 3 that closes an opening of the frame 2, a stator 10 housed and held inside a cylindrical portion of the frame 2, A rotor 5 fixed to a rotary shaft 6 rotatably supported on a bottom portion of the frame 2 and the bracket 3 via a bearing 4 and rotatably disposed on an inner peripheral side of the stator 10; Yes. The frame 2 is made of a metal material such as iron or aluminum, and mechanically holds the rotor 5 and the stator 10 and serves as a heat dissipation path for the stator 10.

  The rotor 5 is fixed to a rotor core 7 that is fixed to a rotary shaft 6 that is inserted through the axial center position, and the rotor 5 is fixed to the outer peripheral surface of the rotor core 7 and is arranged at an equal pitch in the circumferential direction to constitute a permanent magnetic pole. A permanent magnet type rotor including a magnet 8. The rotor 5 is not limited to a permanent magnet rotor, but a squirrel-cage rotor in which a non-insulated rotor conductor is housed in a slot of a rotor core and both sides are short-circuited by a short-circuit ring, and an insulated conductor wire A wound rotor or the like that is mounted in a slot of the rotor core may be used.

  Next, the configuration of the stator 10 will be described with reference to FIGS. For convenience of explanation, the direction of the axis of the rotating shaft 6 is defined as the axial direction, the radial direction of the rotating shaft 6 is defined as the radial direction, and the rotational direction around the axis of the rotating shaft 6 is defined as the circumferential direction.

  The stator 10 includes a stator core 11, a stator coil 20 attached to the stator core 11, and an insulator 15 that insulates the stator core 11 and the stator coil 20.

  The stator core 11 includes an annular core back 12 and a plurality of teeth 13 that protrude radially inward from the inner peripheral surface of the core back 12 and are arranged at equiangular pitches in the circumferential direction. . A space formed between adjacent teeth 13 in the circumferential direction is a slot 14. The stator core 11 is configured by stacking magnetic pieces punched from a magnetic thin plate such as an electromagnetic steel plate.

The insulator 15 is accommodated in each of the slots 14 along the inner wall surface of the slot 14 and electrically insulates the stator core 11 and the stator coil 20 from each other. The insulator 15 is made of paper, resin, or a composite material thereof. Here, the insulator 15 is made in a sheet shape by sandwiching a polyimide film between meta-aramid fibers.

The stator coil 20 is composed of a plurality of coil segments 21. The coil segment 21 is a linear conductor wire produced by coating a bare wire such as copper or aluminum with an insulating material such as enamel resin. The coil segment 21 includes a straight portion 21a inserted into the slot, a first coil end portion 21b protruding from one end of the straight portion 21a in the length direction of the straight portion 21a, and a straight portion 21a from the other end of the straight portion 21a. A second coil end portion 21c protruding in the length direction. In each slot 14, linear portions 21 a of eight coil segments 21 are inserted in a row in the radial direction. The first coil end portion 21b protrudes from each linear portion 21a to one side of the slot 14 in the axial direction. The second coil end portion 21 c protrudes from each straight portion 21 a to the other side in the axial direction of the slot 14.

  The stator coil 20 joins the first coil end portions 21b of the coil segments 21 inserted into the slots 14 of the stator core 11 by welding, brazing, etc., and welds the second coil end portions 21c to each other. It is constructed by joining. Here, the joint structure of the coil segment 21 will be described. For convenience of explanation, the insertion position of the coil segment 21 in the slot 14 is defined as the first layer, the second layer,. Further, the first, second, third, and so on are arranged in the circumferential order of the slots 14. 3 and 4, the vertical direction is the axial direction, the upper side is one side in the axial direction, and the lower side is the other side in the axial direction. In FIG. 4, the left-right direction is the circumferential direction, the left side is one side in the circumferential direction, and the right side is the other side in the circumferential direction.

  First, the first coil end portion 21b protruding from the straight portion 21a inserted in the first layer to the axial direction one side of the slot 14 is bent so as to incline to the circumferential direction side in FIG. On the other hand, the second coil end portion 21c protruding from the linear portion 21a inserted in the first layer to the other axial side of the slot 14 is bent so as to incline to the other circumferential side in FIG. The first coil end portion 21b protruding from the linear portion 21a inserted in the second layer to the axial direction one side of the slot 14 is bent so as to incline to the other side in the circumferential direction in FIG. On the other hand, the second coil end portion 21c protruding from the linear portion 21a inserted in the second layer to the other side in the axial direction of the slot 14 is bent so as to incline toward one side in the circumferential direction in FIG.

  Further, the first coil end portion 21b protruding from the straight portion 21a inserted in the third layer, the fifth layer, and the seventh layer to the axial direction one side of the slot 14 is inclined to the circumferential one side in FIG. Bend like so. The second coil end portion 21c protruding from the linear portion 21a inserted in the third layer, the fifth layer, and the seventh layer to the other side in the axial direction of the slot 14 is inclined to the other side in the circumferential direction in FIG. Bend. The first coil end portion 21b protruding from the linear portion 21a inserted in the fourth layer, the sixth layer, and the eighth layer to one side in the axial direction of the slot 14 is inclined to the other side in the circumferential direction in FIG. Bend. The second coil end portion 21c protruding from the linear portion 21a inserted in the fourth layer, the sixth layer, and the eighth layer to the other axial side of the slot 14 is inclined to one side in the circumferential direction in FIG. Bend.

  The first coil end portion 21b that protrudes from the straight portion 21a inserted in the first layer toward the axial direction one side of the slot 14 is inserted into the second layer of the slot 14 that is separated from the circumferential direction by six slots. It is connected to a first coil end portion 21b protruding from 21a to one side in the axial direction of the slot 14. The second coil end portion 21c protruding from the linear portion 21a inserted into the first layer to the other side in the axial direction of the slot 14 is linear portion inserted into the second layer of the slot 14 which is separated from the circumferential other side by 6 slots. 21a is connected to the second coil end portion 21c protruding to the other axial side of the slot 14. Thereby, all the coil segments 21 inserted in the first layer and the second layer of the slot 14 are connected.

In this way, the coil segments 21 inserted in the first layer and the second layer of the group of the (1 + 6 (n-1)) th slot 14 are connected in series, and two one-turn wave windings are made. Winding is obtained. The coil segments 21 inserted in the first layer and the second layer of the group of (2 + 6 (n-1)) th slot 14 are connected in series to obtain two one-turn wave windings. . The coil segments 21 inserted in the first layer and the second layer of the group of the (3 + 6 (n-1)) th slot 14 are connected in series to obtain two one-turn wave windings. . The coil segments 21 inserted in the first layer and the second layer of the group of the (4 + 6 (n-1)) th slot 14 are connected in series to obtain two one-turn wave windings. . The coil segments 21 inserted in the first layer and the second layer of the group of (5 + 6 (n-1)) th slot 14 are connected in series to obtain two one-turn wave windings. . The coil segments 21 inserted in the first layer and the second layer of the group of the (6 + 6 (n-1)) th slot 14 are connected in series to obtain two one-turn wave windings. . However, n is an integer of 1 or more.

  All the coil segments 21 inserted in the third layer and the fourth layer of the slot 14 are similarly connected. All coil segments 21 inserted in the fifth and sixth layers of the slot 14 are connected in the same way. All coil segments 21 inserted in the seventh layer and the eighth layer of the slot 14 are similarly connected.

  On one side in the axial direction of the stator core 11, the joint portion 16 a between the first coil end portions 21 b of the first and second layer coil segments 21, and the third and fourth layer coil segments 21. A joint 16b between the first coil end portions 21b, a joint 16c between the first coil end portions 21b of the fifth and sixth layer coil segments 21, and a seventh segment of the seventh and eighth layer coil segments 21. The joint portions 16d between the one coil end portions 21b are arranged in a line in the radial direction. In this way, the joint portions 16a to 16d arranged in a line in the radial direction are arranged in the circumferential direction at a one-slot pitch to constitute the coil end 20a on one axial side. In the joint portions 16a-16d arranged in a line in the radial direction, as shown in FIG. 3, the joint portions 16a, 16c have the same axial height, and the joint portions 16b, 16d have the axial height. The same. And the axial direction height of junction part 16b, 16d is lower than the axial direction height of junction part 16a, 16c.

  On the other side in the axial direction of the stator core 11, the joint portion 16 e between the second coil end portions 21 c of the coil segments 21 of the first layer and the second layer, and the first of the coil segments 21 of the third layer and the fourth layer. A joint portion 16f between the two coil end portions 21c, a joint portion 16g between the second coil end portions 21c of the fifth and sixth layer coil segments 21, and a seventh segment of the seventh and eighth layer coil segments 21. The joint portions 16h between the two coil end portions 21c are arranged in a line in the radial direction. In this way, the joint portions 16e-16h arranged in a row in the radial direction are arranged in the circumferential direction at a one-slot pitch to constitute the coil end 20b on the other axial side. In the joint portions 16e-16h arranged in a row in the radial direction, as shown in FIG. 3, the joint portions 16e, 16g have the same axial height, and the joint portions 16f, 16h have the axial height. The same. And the axial direction height of the junction parts 16f and 16h is lower than the axial direction height of the junction parts 16e and 16g.

  In the first embodiment, on one side in the axial direction of the stator core 11, the axial height of the joint portions 16a-16d arranged in a row in the radial direction is from the inner diameter side to the outer diameter side in the radial direction. It changes alternately. Similarly, on the other axial side of the stator core 11, the axial height of the joint portions 16e-16h arranged in a row in the radial direction alternately changes from the inner diameter side to the outer diameter side in the radial direction. doing. As a result, the joint portions 16a to 16d whose radial dimension increases do not overlap in the radial direction, and an increase in the radial dimension of the coil end 20a is suppressed. Similarly, the joint portions 16e-16h whose radial dimension increases do not overlap in the radial direction, and an increase in the radial dimension of the coil end 20b is suppressed. As a result, the rotating electrical machine 100 can be reduced in size.

  Moreover, the notch part is not formed in the edge part of the 1st and 2nd coil end parts 21b and 21c. Thereby, the mechanical strength of the joint portions 16a-16h is ensured. As a result, even when the rotary electric machine 100 is used in an environment where strong vibrations, impacts, etc. are applied, the occurrence of fatigue failure of the joint portions 16a-16h of the coil ends 20a, 20b can be suppressed. In addition, the cross-sectional area of the joints 16a-16h can be increased, and the resistance of the stator coil 20 can be reduced. Thereby, at the time of operation | movement of the rotary electric machine 100, the loss by resistance heating of the stator coil 20 can be reduced, and the characteristic of the rotary electric machine 100 can be improved.

  An insulator 15 is accommodated in the slot 14. Therefore, when the coil segment 21 is inserted into the slot 14, the insulator 15 serves as a cushioning material. Thereby, there is no interference with the burr | flash of the magnetic piece which comprises the stator iron core 11, and the insulation film of the coil segment 21, and generation | occurrence | production of damage to an insulation film is suppressed.

  Next, a first assembly method of the stator coil 20 will be described with reference to FIGS. FIG. 5 is a development view for explaining a method of inserting the coil segments in the stator of the rotating electric machine according to the first embodiment of the present invention into the stator core, and FIG. 6 is a rotating electric machine according to the first embodiment of the present invention. FIG. 7 is a longitudinal sectional view showing a state in which the coil segments in the stator of FIG. 7 are inserted from the first layer to the fourth layer of the slot, and FIG. 7 shows the number of slots in the stator of the rotating electric machine according to the first embodiment of the present invention. FIG. 8 is a development view showing a state in which the coil end portions of the coil segments inserted from the first layer to the fourth layer are connected, and FIG. 8 shows the first slot of the stator of the rotating electrical machine according to the first embodiment of the present invention. FIG. 9 is a longitudinal sectional view showing a state in which the coil end portions of the coil segments inserted from the first layer to the fourth layer are connected to each other, and FIG. 9 shows the coil segment in the stator of the rotating electric machine according to the first embodiment of the present invention. Bets are a longitudinal sectional view showing a state of being inserted into the eighth layer from the first layer of the slot.

  First, a linear coil segment 21 having a set length is cut out from a continuous wire produced by coating a bare wire such as copper or aluminum with an insulating material such as enamel resin. The length of the coil segment 21 inserted in the first layer, the second layer, the fifth layer, and the sixth layer is the same as that of the coil segment 21 inserted in the third layer, the fourth layer, the seventh layer, and the eighth layer. It is longer than the length. The insulating film on both ends of the cut coil segment 21 is removed. Examples of the method for removing the insulating film include mechanical scraping and chemical dissolution removal.

  Next, an insulator 15 is attached to each of the slots 14. Next, as shown in FIG. 5, four coil segments 21 are inserted into each slot 14 from one axial direction side of the stator core 11. As shown in FIG. 6, the straight portions 21 a of the four coil segments 21 are accommodated so as to be positioned from the first layer to the fourth layer of each slot 14.

Next, on the one side in the axial direction of the stator core 11, the root portion of the first coil end portion 21b of the coil segment 21 inserted in each of the first layer and the third layer is bent, and the first coil end portion 21b is bent. Is inclined to one side in the circumferential direction. Furthermore, the tip end portion of the first coil end portion 21b is bent so as to face outward in the axial direction at a position shifted by one slot in the circumferential direction. The base portion of the first coil end portion 21b of the coil segment 21 inserted in each of the second layer and the fourth layer is bent, and the first coil end portion 21b is inclined to the other side in the circumferential direction. Further, the tip end portion of the first coil end portion 21b is bent so as to face outward in the axial direction at a position shifted by three slots to the other side in the circumferential direction. As a result, the first end of the first coil end portion 21b of the coil segment 21 inserted in the first layer and the first of the coil segment 21 inserted in the second layer of the slot 14 separated by 6 slots on the circumferential side. The tip end portion of the coil end portion 21b is overlapped in the radial direction. Similarly, the first end of the first coil end portion 21b of the coil segment 21 inserted in the third layer and the first of the coil segment 21 inserted in the fourth layer of the slot 14 separated by 6 slots on the circumferential side. The tip end portion of the coil end portion 21b is overlapped in the radial direction.

Next, on the other side in the axial direction of the stator core 11, the root portion of the second coil end portion 21c of the coil segment 21 inserted in each of the first layer and the third layer is bent, and the second coil end portion 21c. Is inclined to the other side in the circumferential direction. Further, the tip of the second coil end portion 21c is bent so as to face outward in the axial direction at a position shifted by three slots to the other side in the circumferential direction. The base portion of the second coil end portion 21c of the coil segment 21 inserted in each of the second layer and the fourth layer is bent, and the second coil end portion 21c is inclined to one side in the circumferential direction. Furthermore, the tip end of the second coil end portion 21c is bent so as to face outward in the axial direction at a position shifted by three slots to the circumferential side. As a result, the second end of the second coil end portion 21c of the coil segment 21 inserted into the first layer and the second of the coil segment 21 inserted into the second layer of the slot 14 separated by six slots on the other side in the circumferential direction. The tip end portion of the coil end portion 21c is overlapped in the radial direction. Similarly, the second end of the second coil end portion 21c of the coil segment 21 inserted in the third layer and the second of the coil segment 21 inserted in the fourth layer of the slot 14 which is 6 slots away from the other circumferential side. The tip end portion of the coil end portion 21c is overlapped in the radial direction.

  Next, as shown in FIG. 7 and FIG. 8, on both sides in the axial direction of the stator core 11, the distal end portions of the first coil end portions 21 b and the distal end portions of the second coil end portion 21 c that are overlapped in the radial direction. They are connected to each other by welding, brazing, or the like.

  Next, four coil segments 21 are inserted into each slot 14 from one axial side of the stator core 11. As a result, as shown in FIG. 9, the straight portions 21 a of the four coil segments 21 are accommodated so as to be positioned in the fifth to eighth layers.

  Further, the coil segment 21 inserted from the fifth layer to the eighth layer of the slot 14 is subjected to a bending process similar to the bending process for the coil segment 21 inserted from the first layer to the fourth layer of the slot 14. . Further, on both sides in the axial direction of the stator core 11, the tip portions of the first coil end portions 21b and the tip portions of the second coil end portions 21c that are overlapped in the radial direction are respectively welded or brazed. Connected. Accordingly, as shown in FIG. 3, the joint portions 16a to 16d are arranged in the radial direction at the same position in the circumferential direction while alternately changing the height position in the axial direction. The coil ends 20a are configured by arranging the joint portions 16a to 16d arranged in the radial direction at a one-slot pitch in the circumferential direction. The joint portions 16e to 16h are arranged in the radial direction at the same position in the circumferential direction by alternately changing the height positions in the axial direction. The joint portions 16e-16h arranged in the radial direction are arranged at a one-slot pitch in the circumferential direction, thereby forming the coil end 20b.

  In the first assembly method of the coil segment 21, the coil segment 21 is inserted from the first layer to the fourth layer of each slot 14, and the first and second coil end portions 21b and 21c are bent. The first coil end portions 21b and the second coil end portions 21c are connected to each other. Thereafter, the coil segment 21 is inserted from the fifth layer to the eighth layer of each slot 14, the first and second coil end portions 21b and 21c are bent, and the first coil end portions 21b and the second The coil end portions 21c are connected to each other. However, the first assembly method of the coil segment 21 is not limited to this.

For example, the coil segment 21 is inserted from the fifth layer to the eighth layer of each slot 14, the first and second coil end portions 21b and 21c are bent, and the first coil end portions 21b and The two coil end portions 21c are connected to each other. Thereafter, the coil segment 21 is inserted from the first layer to the fourth layer of each slot 14, the first and second coil end portions 21b and 21c are bent, and the first coil end portions 21b and the second The coil end portions 21c may be connected to each other.

  In addition, the coil segment 21 is inserted into two adjacent layers of each slot 14, the first and second coil end portions 21b and 21c are bent, and the first coil end portions 21b and the second coil end portions are arranged. The step of connecting the 21c members may be repeated two layers at a time from the radially inner side to the outer side.

  Next, a second assembling method of the coil segment 21 will be described with reference to FIGS. FIG. 10 is a development view for explaining a method of inserting the coil segment group in the stator of the rotating electrical machine according to the first embodiment of the present invention from the first layer to the fourth layer of the slot, and FIG. 11 is an embodiment of the present invention. FIG. 10 is a development view showing a state where the coil segment group inserted into the first layer to the fourth layer of the slot in the stator of the rotating electrical machine according to the first embodiment is bent.

First, the same number of pairs of the coil segments 21 inserted in the first layer and the second layer are arranged in an annular shape with a 1-slot pitch. Next, each of the first coil end portions 21b on one side was subjected to bending processing, and was separated from the tip end portion of the first coil end portion 21b of the coil segment 21 inserted into the first layer by 6 slots on the circumferential side. The distal end portion of the first coil end portion 21b of the coil segment 21 inserted in the second layer of the slot 14 is overlapped in the radial direction. Next, as shown in FIG. 10, the coil segment group 22 thus manufactured is inserted into the first layer and the second layer of all the slots 14 from one side in the axial direction of the stator core 11. Coil segment groups 22 produced in the same manner are inserted into the third and fourth layers of all slots 14 from one side in the axial direction of the stator core 11.

Next, bending is performed on each of the second coil end portions 21 c on the other side in the axial direction of the stator core 11. As a result, as shown in FIG. 11, the first end of the second coil end portion 21c of the coil segment 21 to be inserted into the first layer and the third layer and the first of the slot 14 separated by 6 slots on the other side in the circumferential direction. The tips of the second coil end portions 21c of the coil segments 21 inserted in the second layer and the fourth layer are overlapped in the radial direction. Next, on both sides in the axial direction of the stator core 11, the tip portions of the first coil end portions 21b and the tip portions of the second coil end portions 21c that are overlapped in the radial direction are connected by welding, brazing, or the like. The

  Further, the coil segment group 22 is inserted from the fifth layer to the eighth layer of all slots 14. Next, the same bending process is performed on the second coil end portion 21 c of each coil segment 21. Next, the distal end portions of the first coil end portions 21b and the distal end portions of the second coil end portions 21c that are overlapped in the radial direction are connected by welding, brazing, or the like, and the stator 10 is obtained.

  In the second assembly method of the coil segment 21, the coil segment group 22 is sequentially inserted into the slot 14 from the inner diameter side to the outer diameter side. However, the coil segment group 22 is inserted into the slot 14 from the outer diameter side to the inner diameter side. May be inserted sequentially.

  Here, for welding the first coil end portions 21b and the second coil end portions 21c, methods such as arc welding and laser welding are used.

  It is difficult to arc weld a pair of the first and second coil end portions 21b, 21c having a low height sandwiched between the pair of the first and second coil end portions 21b, 21c having a high height. is there. Therefore, when arc welding is used, the coil segment 21 is inserted into the slot 14, the first and second coil end portions 21b and 21c are bent, and the first and second coil end portions 21b and 21c are welded. It is desirable to perform a series of steps in order of four coil segments 21 from the inner diameter side to the outer diameter side.

  On the other hand, in laser welding, a pair of first and second coil end portions 21b and 21c having a low height can be irradiated with laser from the outside in the axial direction. Thus, a series of steps of inserting the coil segment 21 into the slot 14, bending the first and second coil end portions 21b and 21c, and welding the first and second coil end portions 21b and 21c are performed in the coil segment. It is not necessary to carry out 21 in the order of four from the inner diameter side to the outer diameter side.

Embodiment 2. FIG.
FIG. 12 is a longitudinal sectional view showing a main part of the stator of the rotating electrical machine according to the second embodiment of the present invention.

  In FIG. 12, the coil segments 21 are all formed in the same length. The coil segment 21 inserted into the first layer, the second layer, the fifth layer, and the sixth layer of the slot 14 has a large amount of protrusion from the slot 14 on one side in the axial direction. On the other hand, the coil segment 21 inserted in the third layer, the fourth layer, the seventh layer, and the eighth layer of the slot 14 has a large amount of protrusion from the slot 14 on the other side in the axial direction.

Thereby, in the axial direction one side of the stator core 11, the junction part 16a of the 1st coil end parts 21b of the coil segment 21 of a 1st layer and a 2nd layer, and the coil segment of a 5th layer and a 6th layer The height in the axial direction between the first coil end portions 21b of the first coil end portions 21b and the first coil end portions 21b of the third layer and the fourth layer coil segments 21 is the same as that of the seventh layer. The height of the eighth layer coil segment 21 is higher than the axial height of the joint portion 16d between the first coil end portions 21b.

On the other side in the axial direction of the stator core 11, the joint portion 16 e between the second coil end portions 21 c of the first and second layer coil segments 21, and the fifth and sixth layer coil segments 21. The axial height of the joint portion 16g between the two coil end portions 21c is equal to the joint portion 16f between the second coil end portions 21c of the third and fourth coil segments 21, and the seventh and eighth layers. The coil segment 21 is lower than the height in the axial direction between the second coil end portion 21c and the joint portion 16h.
Other configurations are the same as those in the first embodiment.

In the stator 10A configured as described above, the axial height of the joint portions 16a to 16d arranged in a row in the radial direction on one side in the axial direction of the stator core 11 has an outer diameter from the inner diameter side in the radial direction. It changes alternately toward the side. Similarly, on the other axial side of the stator core 11, the axial height of the joint portions 16e-16h arranged in a row in the radial direction alternately changes from the inner diameter side to the outer diameter side in the radial direction. doing. Moreover, the notch part is not formed in the edge part of the 1st and 2nd coil end parts 21b and 21c. Therefore, the effect can be obtained in the second embodiment as in the first embodiment.

  According to the second embodiment, the length of the coil segment 21 is the same regardless of the insertion position of the coil segment 21 in the slot 14. As a result, only one type of coil segment 21 is required, and the production equipment for the coil segment 21 and the assembly equipment for the stator can be simplified, and the production cost of the stator can be reduced.

  In each of the above embodiments, the stator coil 20 is constituted by a plurality of wave windings formed by connecting the coil segments 21, but the stator coil is not limited to the wave winding. Any distributed winding may be used. For example, a lap winding such as a turtle shell coil may be used. In this case, the first coil end portions 21b of the coil segments 21 inserted in the first layer of the first slot 14 and the second layer of the seventh slot are connected on one side in the axial direction of the stator core 11. The first coil end portions 21b of the coil segments 21 inserted in the third layer of the first slot 14 and the fourth layer of the seventh slot are connected to each other, and the fifth layer and the seventh layer of the first slot 14 are connected. The first coil end portions 21b of the coil segments 21 inserted in the sixth layer of the first slot are connected together, and the coil segments 21 inserted in the seventh layer of the first slot 14 and the eighth layer of the seventh slot The first coil end portions 21b are connected to each other. Furthermore, on the other axial side of the stator core 11, the second coil end portions 21c of the coil segments 21 inserted in the second layer of the first slot 14 and the third layer of the seventh slot are connected, The second coil end portions 21c of the coil segments 21 inserted in the fourth layer of the first slot 14 and the fifth layer of the seventh slot are connected to each other, and the sixth layer and the seventh layer of the first slot 14 are connected. The second coil end portions 21c of the coil segments 21 inserted in the seventh layer of the slot are connected. As a result, the coil segment 21 inserted in the first layer, the third layer, the fifth layer, and the seventh layer of the first slot 14 and the second layer, the fourth layer, the sixth layer of the seventh slot 14, and the A tortoiseshell-shaped coil is obtained in which the coil segment 21 inserted in the eighth layer is connected in series.

  In each of the above embodiments, the coil segments 21 inserted in the pair of slots 14 separated by 6 slots are connected to each other, but the pair of slots 14 into which the connected coil segments 21 are inserted is 6 It is not limited to a pair of slots apart. That is, the pair of slots 14 into which the coil segments 21 to be connected are inserted may be a pair of slots 14 separated by a plurality of slots, for example, a pair of slots 14 separated by three slots.

  Further, in each of the above embodiments, eight coil segments 21 are stored in each slot 14 arranged in a row in the radial direction. However, the number of coil segments 21 stored in each slot 14 is as follows. It may be 2m (where m is an integer of 2 or more).

  10, 10A Stator, 11 Stator core, 16a-16h joint, 21 coil segment, 21a linear part, 21b 1st coil end part, 21c 2nd coil end part.

Claims (2)

An annular stator core in which a plurality of slots having a radial direction in the slot depth direction are arranged in the circumferential direction;
A plurality of coil segments inserted into each of the slots,
The plurality of coil segments respectively include a straight portion inserted into the slot, a first coil end portion extending from one end of the straight portion to one side in the axial direction of the slot, and the other end of the straight portion. A second coil end portion extending to the other side in the axial direction of the slot,
In each of the slots, 2 m of the straight portions are inserted in a line in the radial direction (where m is an integer of 2 or more),
The first coil end portions of the coil segments that are inserted in one slot and a slot that is spaced apart from the one slot by a plurality of slots in the circumferential direction differ in the radial position of the straight portion by one straight portion. Coil segments that are connected and that are inserted in the one slot and a slot that is circumferentially separated from the one slot by the plurality of slots differ in the radial position of the linear portion by one linear portion. The second coil end portions are connected to each other, and the plurality of coil segments are connected,
The joint portions of the first coil end portions are alternately arranged in the circumferential direction, with m pieces arranged in a row in the radial direction, alternately changing the height in the axial direction,
Rotation in which the joint portions of the second coil end portions are alternately arranged in the circumferential direction by alternately changing the height in the axial direction and arranging m or (m−1) pieces in a row in the radial direction. Electric stator.   The stator for a rotating electrical machine according to claim 1, wherein the plurality of coil segments are formed to have the same length.

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