JP2013055732A - Rotary electric machine stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve insulation quality of weld zones between each other and productivity even when including a lot of the weld zones in a rotary electric machine stator.SOLUTION: A stator 10 includes a plurality of segment coils 22 as a stator coil. Each segment coil 22 is formed in a coil form at one side coil end portion 46 where conductor segments 28 are a plurality of coil elements and the conductor segments 28 are respectively coupled with the other conductor segments 28 at a plurality of weld zones 50 which are three or more portions and separate in the radial direction. The weld zones 50 are arranged while gradually shifting in the circumferential direction from the innermost circumferential weld zone 50 to the outermost peripheral weld zone 50 by a length da less than half of a distance ds between adjacent slots 12 in the circumferential direction.

Description

  The present invention relates to a rotating electrical machine stator including a stator core having slots provided at a plurality of locations in the circumferential direction and a plurality of stator coils wound around the stator core.

  Conventionally, as a stator of a rotating electrical machine, a stator core provided with a plurality of radially extending grooves called slots is provided in the circumferential direction, and stator coils are distributed in the stator core so as to be inserted into two slots spaced apart from each other in the circumferential direction. Structures that are wound by winding are known.

  In this case, the stator coil may be a segment coil that is formed in a coil shape by connecting conductor segments as a plurality of coil elements to each other. For example, each conductor segment is formed in a U shape by two parallel legs and a turn part connecting the two legs.

  Further, a plurality of conductor coils are formed in a coil shape by connecting a plurality of conductor segments, and a plurality of segment coils that are unit coils are provided, and a plurality of segment coils are connected in the circumferential direction of the stator core to thereby form an annular portion of each phase. Can also be considered.

  For example, Patent Document 1 describes an AC generator in which a plurality of phase stator coils are formed by joining a plurality of conductor segments formed in a U shape. In this AC generator, in a conductor segment, a connecting portion extending to one side of a slot of a stator iron core is formed by soldering or TIG welding the connecting portions of other conductor segments. The inner peripheral side connection portion and the outer peripheral side connection portion which are welded and joined at the distal end portion of the joint portion are arranged so as to be shifted by 1/2 slot in the circumferential direction. In addition to Patent Document 1, there is Patent Document 2 as a prior art document related to the present invention.

JP 2009-153380 A JP 2002-78269 A

  In the stator described in Patent Document 1, when welded portions are provided at a plurality of three or more locations shifted in the radial direction, when the plurality of welded portions are viewed in the axial direction of the stator, a plurality of substantially entire circumferences are provided. There is a possibility that a region surrounded by the welded portion is formed. In other words, almost the entire circumference of each weld may be blocked by many other welds. In this case, it is difficult for a jig for forming a welded part such as a welding jig also serving as an earth electrode to enter an area surrounded by a plurality of welded parts, and productivity may deteriorate. On the other hand, it is conceivable to arrange a plurality of welds so that they are arranged at the same position in the circumferential direction of the stator. In this case, however, there is room for improvement in terms of improving the insulation between the welds. .

  An object of the present invention is to improve productivity while improving insulation between welded portions even when many welded portions are provided in a rotating electrical machine stator.

  A rotating electrical machine stator according to the present invention is a rotating electrical machine stator including a stator core having slots provided at a plurality of locations in a circumferential direction, and a plurality of stator coils wound around the stator core, wherein each stator coil is In the one-side coil end projecting from one axial direction of the stator core, the plurality of coil elements are formed in a coil shape by being connected to the coil element on the other side at a plurality of welded portions at three or more locations separated in the radial direction. The plurality of welded portions are arranged in the circumferential direction by less than ½ of the interval between the slots adjacent in the circumferential direction from the welded portion on the innermost circumferential side toward the welded portion on the outermost circumferential side. A rotating electrical machine stator characterized by being gradually displaced.

  Further, in the rotating electrical machine stator according to the present invention, preferably, the stator core is wound with distributed winding, and the plurality of stator coils are connected in an annular shape, thereby forming a plurality of segment annular portions. The segment annular portion of each phase is formed by bending a plurality of U-shaped conductor segments, which are coil elements, inserted into the slots of the stator core in the axial direction and then radially separated from each other. The plurality of segment coils, which are the stator coils formed in a coil shape, are connected to each other at the welded portions.

  According to the rotating electrical machine stator according to the present invention, productivity can be improved while improving the insulation between the welded portions.

It is a perspective view which shows the rotary electric machine stator of embodiment of this invention. It is the figure which looked at the stator of FIG. 1 from the outer peripheral side. It is a figure which shows the state before arrange | positioning one conductor segment which comprises each phase stator coil in a stator core. In the stator of FIG. 1, a segment annular portion corresponding to one phase corresponding to one phase is taken out from the stator core, and a plurality of weld portions of each stator coil are arranged at the same position in the circumferential direction. It is a figure which shows eight unit coils from the 1st to the 8th of the winding start of the first half part among the segment annular parts of FIG. It is a schematic diagram explaining a mode that eight unit coils of the first half part of FIG. 5 are wound around a stator core. FIG. 7 is a schematic diagram for explaining a state where eight unit coils in the latter half are wound around the stator core following FIG. 6. It is a perspective view which shows the one-side coil end part of one stator coil of FIG. 5 by the relationship with several slots. It is the schematic which looked at the circumferential direction part of the one-side coil end of the stator of FIG. 1 from the axial direction. FIG. 10 is a view corresponding to FIG. 9 in the rotating electric machine stator of the first example of the comparative example. FIG. 11 is a cross-sectional view of the rotating electrical machine stator of FIG. 10 cut at a portion corresponding to a slot. FIG. 10 is a view corresponding to FIG. 9 in the rotary electric machine stator of the second example of the comparative example.

  Hereinafter, an embodiment according to the present invention will be described with reference to FIGS. 1 to 9. The rotating electrical machine stator (hereinafter simply referred to as “stator”) of the present embodiment is used to configure a rotating electrical machine such as an electric motor or a generator. As shown in FIGS. 1 and 2, the stator 10 includes an annular magnetic material stator core 14 and a plurality of phases U, V, and W, which are a plurality of phases wound around the stator core 14 by distributed winding. Segment annular portions 16, 18, and 20. When the stator 10 is used, a rotor (not shown) fixed to the rotating shaft is arranged on the radially inner side of the stator 10, and the stator 10 and the rotor are opposed to each other in the radial direction to constitute a radial rotating electric machine. To do. The stator core 14 is formed of, for example, a powder magnetic core formed by press-molding magnetic powder, or a laminate of metal plates such as electromagnetic steel plates. The stator core 14 has slots 12 formed radially at a plurality of locations on the inner peripheral surface in the circumferential direction. In FIGS. 1 and 2, the portions denoted by “u”, “v”, and “w” represent the U phase, the V phase, and the W phase, respectively.

  The segment annular portions 16, 18, 20 of each phase are formed by connecting segment coils 22, which are a plurality of stator coils, in an annular shape, and are connected to each other by a first-round element 24 (FIG. 5) and a second-round element 26. (FIG. 7). Each segment coil 22 is formed in a coil shape by arranging a plurality of substantially U-shaped conductor segments 28 shown in FIG. 3 and connecting the plurality of conductor segments 28 to each other. Each conductor segment 28 includes two parallel leg portions 32 having straight portions 30 respectively inserted into two slots 12 (FIG. 1) at both ends in the width direction (left and right direction in FIG. 3), and leg portions 32. And a turn portion 34 for connecting the ends of the two. In addition, the conductor segment 28 is covered with an insulating coating 38 which is an insulating portion made of polyamide imide or the like around the conductor wire 36 except for both ends.

  That is, the stator 10 (FIG. 1) according to the present embodiment is a so-called “segment coil winding type”, in which a conductor wire 36 that is a rectangular wire such as a rectangular wire having a rectangular cross section is covered with an insulating film 38. A plurality of segment coils 22 (FIG. 1) in which coil strands are formed in a coil shape are provided. Then, by connecting the plurality of segment coils 22 in the circumferential direction of the stator core 14 at least for one round (in the case of the present embodiment, two rounds), the segment annular portions 16, 18, 20 (FIG. 1) of each phase are connected. Is formed.

  FIG. 4 shows the stator 10 shown in FIG. 1 in which the U-phase segment annular portion 16 corresponding to one phase is taken out from the stator core 14 (FIG. 1), and a plurality of welds 50 of each segment coil 22 are arranged in the circumferential direction. It is a figure arrange | positioned and shown in the same position. In practice, as will be described in detail later with reference to FIGS. 8 and 9, the plurality of welded portions 50 of each segment coil 22 are directed from the innermost circumferential side welded portion 50 toward the outermost circumferential side welded portion 50. Accordingly, the welding portion 50 is illustrated as described above for ease of explanation.

  Next, of the U-phase, V-phase, and W-phase segment annular portions 16, 18, and 20, the U-phase segment annular portion 16 will be described as a representative. The U-phase segment annular portion 16 is wound around the stator core 14 so as to annularly connect the segment coils 22 which are eight unit coils each having a predetermined unit coil interval D1 (FIG. 5) in the circumferential direction. The second core element 26 is formed by winding the stator core 14 around the stator core 14 in a similar manner so that the stator core 14 is rotated once around the first core element 24 as shown in FIG. As a result, the segment annular portion 16 is formed by rotating the stator core 14 once. In this case, the slot 12 (FIG. 1) in which the first-round element 24 is arranged and the slot 12 in which the second-round element 26 are arranged are shifted one by one in the circumferential direction.

  The basic shapes of the V-phase and W-phase segment annular portions 18 and 20 (FIG. 1) are the same as in the U-phase. The U-shaped segment annular portion 16 is configured by combining 16 segment coils 22 which are unit coils each having a coil wire formed in a coil shape. In FIG. 4, C1, C2,..., C16 are coil numbers for distinguishing the 16 segment coils 22, and the segment in which the winding start of the U-phase segment annular portion 16 is the first unit coil. In the coil C1, the winding end is a segment coil C16 which is the 16th unit coil.

  As shown in FIG. 4, the segment coil C2 is disposed adjacent to the segment coil C1, and subsequently disposed adjacent to C3, C4,. For this reason, the coil number is i, and the i-th coil and the (i + 8) -th coil are arranged so as to partially overlap in the radial direction although they are shifted by one slot.

  FIG. 5 is a diagram showing the first-round element 24 extracted from the segment annular portion 16 of FIG. The first circumference element 24 of the segment annular portion 16 is formed by connecting the eight segment coils 22 in an annular shape. Each segment coil 22 is formed of a plurality of conductor segments 28. In FIG. 5, the ninth to sixteenth segment coils 22 of the second-round element 26 (see FIG. 7) of the segment coil 22 are omitted, but the basic shape is the first-round element of FIG. Similar to the shape of 24, the arrangement position is shifted in the circumferential direction with respect to the first-round element 24. The three-phase segment coil 22 is wound around the stator core 14 (FIG. 1) by distributed winding.

  FIG. 6 is a schematic diagram for explaining a state in which the first-round element 24 is arranged on the stator core 14 in the segment annular portion 16 in FIG. 4. FIG. 7 is a schematic diagram for explaining a state in which the second-round element 26 is arranged on the stator core 14 in the segment annular portion 16 in FIG. 4. In FIG. 7, the first-round element 24 of FIG. 6 is omitted. 6 and 7 show a plan view of the stator core 14 and a plurality of segment coils 22 on the outside thereof. The segment coil 22 is wound around a plurality of locations in the circumferential direction of the stator core 14 so as to be inserted into two slots 12 that are separated in the circumferential direction across several slots 12. The two slots 12 are separated by a predetermined unit coil interval D1. Hereinafter, the segment coil 22 may be described with a coil number. The segment coil C1 shown in FIG. 6 is connected to the input terminal side (IN side), which is the power line side of the rotating electrical machine, at the start of winding of the segment annular portion 16 (FIG. 4).

  The segment coil C1 is formed in a coil shape by winding a coil wire a plurality of times between the slots S4 and S10. This winding start is on the outer peripheral side of the stator core 14 on the input terminal side, and is wound around the slot 12 in a coil shape so as to go from the outer peripheral side to the inner peripheral side. Next, the segment coil C1 is connected to the segment coil C2 at the end of winding. That is, the segment coil C1 is formed into a coil shape by winding the coil wire a plurality of times between the slots S10 and S16 over the slot S16 that is separated from the slot S10 by the unit coil interval D1 at the end of the winding of the segment coil C1. C2 is configured. Subsequently, this is sequentially repeated to form the segment coil C1 to the segment coil C8, whereby the first-round element 24 is configured.

  The winding end of the first turn element 24 is connected to the segment coil C9 of the second turn element 26 shown in FIG. At this time, the segment coil C9 is formed in a coil shape by being wound one slot from the segment coil C1 and wound a plurality of times between the slots S3 and S9. Next, it is connected to the segment coil C10 at the end of winding of the segment coil C9. That is, the segment coil C9 is formed in a coil shape by winding a coil wire a plurality of times between the slots S9 and S15 over the slot S15 that is separated from the slot S9 by the unit coil interval D1 at the end of winding of the segment coil C9. C10 is constituted. Subsequently, this is sequentially repeated to form the segment coil C9 to the segment coil C16, whereby the second circuit element 26 is configured.

  Further, the winding end of the segment coil C16 is taken out from the outermost peripheral side of the stator core 14 and connected to the neutral point of the rotating electrical machine. In FIG. 7, the winding end of the segment coil C16 is shown as OUT (neutral point). As described above, the slot 12 in which the first-round element 24 and the second-round element 26 of the segment annular portion 16 are arranged is shifted in the circumferential direction. Although the U-phase segment annular portion 16 has been described above, the V-phase and W-phase segment annular portions 18 and 20 are formed in the same manner, and the V-phase segment annular portion 18 is disposed as shown in FIG. The slot 12 to be shifted is shifted by 2 in the circumferential direction, and the slot 12 in which the W-phase segment annular portion 20 is arranged is further shifted by 2 in the circumferential direction.

  In forming the segment annular portions 16, 18, and 20 of each phase, the conductor segments 28, which are a plurality of substantially U-shaped coil elements, one of which is shown in FIG. 3 above, are used. That is, one segment coil 22 is formed by connecting a plurality of conductor segments 28 in a coil shape, and the segment coils 22 are connected in a plurality of rings, that is, connected to each other, thereby connecting the segment ring portions 16, 18, 20 of each phase. Is forming. In this case, each conductor segment 28 has two parallel leg portions 32 provided at both ends at the same interval as the unit coil interval D1, and one end of each leg portion 32 is connected by a turn portion 34. .

  FIG. 8 is a perspective view showing a one-side coil end portion of one segment coil 22 in FIG. 5 in relation to a plurality of slots 12. As shown in FIG. 8, when the segment coil 22 is formed, a plurality of conductor segments 28, for example, five, are used, and the two slots 12 arranged at a predetermined unit coil interval D1 are arranged in the axial direction. A portion protruding from one axial side of the stator core 14 after insertion (upper side in FIG. 8) is bent in a substantially circumferential direction. Thereafter, the conductor segments 28 that protrude from one axial direction of the stator core 14 and are exposed from the insulating coating 38 at the distal ends of the conductor segments 28 that are separated from each other in the radial direction, and are bent to the opposite sides in the circumferential direction. The tip portions of the two are overlapped and connected by a welded portion 50, and this is performed by a plurality of conductor segments 28 to form a coil, thereby forming a segment coil 22.

  More specifically, the plurality of substantially U-shaped conductor segments 28 are arranged on one side in the axial direction from the other axial side of the stator core 14 (the lower side in FIG. 8) so as to be aligned along the radial direction of the stator 10. Insert toward the upper side of FIG. The portions protruding from one axial side surface (upper side surface in FIG. 8) of the stator core 14 at the tip ends of the two leg portions 32 of each conductor segment 28 are substantially circumferential directions (“circumferential direction”). Unless otherwise noted, the circumferential direction of the stator is the same throughout the present specification and claims.)

  Also, a portion bent so as to face the axial direction (vertical direction in FIG. 1) at the tip of the leg portion 32 on one side of one conductor segment 28, and a radial direction (“radial direction”) on the one conductor segment 28. Unless otherwise specified, refers to the radial direction of the stator, which is the same throughout the present specification and claims) The axial direction at the tip of the leg 32 on the other side of the other conductor segment 28 adjacent to the other conductor segment 28 The welded portion 50 is formed by connecting the portions bent so as to face toward each other by welding such as TIG welding. And the coil-shaped segment coil 22 is formed by performing the formation operation | work of such a welding part 50 by each conductor segment 28. FIG.

  As shown in FIG. 1, in a state where the segment annular portions 16, 18, and 20 of each phase are assembled to the stator core 14, each segment coil 22 is pivoted by a portion protruding outward from both axial end surfaces of the stator core 14. One coil end 46 and the other coil end 48 which are two coil ends on both sides in the direction are formed. The one-side coil end 46 is formed by a welded portion 50 side portion that is a joint portion between the tip portions of the plurality of conductor segments 28 in each segment coil 22. The other side coil end 48 is formed by the turn part 34 (FIG. 3) side portion of each segment coil 22.

  FIG. 9 is a schematic view of a part in the circumferential direction of the one-side coil end 46 of the stator 10 of FIG. 1 as viewed from the axial direction. As shown in FIG. 9, each segment coil 22 has a plurality of welded portions 50 at the three or more locations (5 locations in the illustrated example) where the plurality of conductor segments 28 are separated in the radial direction at the one-side coil end 46. It is formed in a coil shape by being connected to the conductor segment 28. Further, the plurality of welded portions 50 are arranged in the circumferentially adjacent slots 12 from the welded portion 50 on the innermost peripheral side (left end in FIG. 9) toward the welded portion 50 on the outermost peripheral side (right end in FIG. 9). Are gradually shifted to one side in the circumferential direction (arrow α side in FIG. 9) by da (<ds / 2) having a size less than ½ of the slot interval ds. Here, since the plurality of slots 12 are radially formed in the stator 10, the “slot interval” means a central angle that is an interval angle between the slots 12 around the central axis of the stator 10. When the number is n, it refers to (360 / n) degrees. Therefore, a size da less than ½ of the interval between the slots 12 adjacent in the circumferential direction means an angle less than 360 / 2n (the same applies to the entire specification and claims). .)

  In order to regulate the arrangement positions of the plurality of welded portions 50 in this manner, for example, in the one-side coil end 46 portion of the segment coil 22 shown in FIG. 8, the approximate circumference of the distal end portion of each leg portion 32 of the plurality of conductor segments 28. The length of the portion bent in the direction can be gradually decreased or gradually increased from the innermost conductor segment 28 toward the outermost conductor segment 28.

  Unlike the example shown in FIGS. 8 and 9, the plurality of welded portions 50 are ½ of the slot interval ds from the innermost peripheral welded portion 50 toward the outermost peripheral welded portion 50. It is also possible to arrange them by gradually shifting to the other side in the circumferential direction (the side opposite to the arrow α in FIG. 9) by da (<ds / 2) which is less than the size.

  According to such a stator 10, in each segment coil 22, a plurality of welded portions 50 are arranged at positions shifted in the circumferential direction of the stator 10, so that the interval between the radially adjacent welded portions 50 can be increased, The insulation between the welded parts 50 can be improved. Moreover, as the plurality of welded parts 50 move from the innermost peripheral welded part 50 toward the outermost peripheral welded part 50, the welded parts 50 are gradually shifted in the circumferential direction by a size da less than ½ of the slot interval ds. For this reason, it becomes easy to insert a jig for forming the welded portion 50, for example, a welding jig that also serves as an earth electrode, between the portions where the welded portions 50 that are separated in the circumferential direction are to be formed. Even in the case of providing, the productivity of the stator 10 can be improved.

  For example, at the time of forming the welded portion 50, the overlapping portion is formed by overlapping the tip portions of the two conductor segments 28 for forming the welded portion 50, and the overlapping portion is formed from one axial side of the stator 10. A welding head (not shown), which is a discharge electrode that causes an arc discharge between the overlapping portions and is opposed to each other through a space, is disposed. At the same time, a welding jig 52 also serving as a ground electrode indicated by a two-dot chain line in FIG. 9 is arranged so as to be in contact with one or a plurality of conductor segments 28 on one side or both sides in the circumferential direction of the portion to be the welded portion 50.

  Further, the welding jig 52 is grounded and a predetermined high voltage is applied to the welding head. As a result, arc discharge occurs between the tip of the welding head and the overlapped portion, the overlapped portion is melted, and the ends of the two conductor segments 28 are electrically and mechanically joined to each other. Is formed. According to the present embodiment, as shown in FIG. 9, the welding jig 52 can be easily arranged between the overlapping portions adjacent in the circumferential direction, and the productivity of the stator 10 can be improved. Furthermore, since the welding operation can be facilitated, the quality of the welded portion 50 can be improved.

  On the other hand, in the case of the configuration described in Patent Document 1 described above, the inner peripheral side connection portion and the outer peripheral side connection portion, which are welded and joined at the tip end portion of the conductor segment, are shifted by 1/2 slot in the circumferential direction. Has been. When the welded portions are provided at a plurality of three or more locations shifted in the radial direction of the stator in the configuration of Patent Document 1 as described above, when the welded portion of the stator is viewed in the axial direction, the plurality of welded portions are almost entirely disposed. There is a possibility that a region surrounded by is formed. For this reason, in order to insert a jig, such as a welding jig, that also serves as an electrode between adjacent welded parts in the circumferential direction, the welding jig needs to be considerably thinned, and the quality of the welded part may deteriorate. is there. In addition, Patent Document 1 also describes changing the height in the axial direction of a plurality of connecting portions separated in the radial direction at the coil end as another configuration. However, in this method, welding such as TIG welding is performed. When forming a welded part in a superposed part with a small axial height with a welding head that applies a high voltage to the radiant heat, the radiant heat accompanying the arc discharge is easily transmitted to another superposed part with a high axial direction. There is a possibility that the quality of the part and the insulating part will deteriorate. According to this embodiment, since it is not necessary to change the axial direction height from the stator core of each welded portion to the same at the one-side coil end, such inconvenience can be eliminated.

  Further, Patent Document 2 describes that the side where the joint portions and the turn portions of the conductor segments are respectively provided is alternately reversed in the radial direction by the conductor segments arranged in a plurality of radial directions. For this reason, the turn portions and the welded portions are alternately arranged in the radial direction at each of the coil ends on both sides. In such a configuration, in order to prevent thermal damage from the welded portion to the turn portion, it is necessary to secure a distance between the welded portion and the turn portion, and the axial height from the stator core of the coil end is correspondingly increased. It can grow. According to the present embodiment, such inconvenience is eliminated, and sufficient insulation can be secured while reducing the axial height of the coil end from the stator core.

  In the above description of the embodiment, the case where the welding jig 52 that also serves as the ground electrode is used in the welding operation has been described. However, even when the welding jig is used for simply positioning the overlapping portion that forms the welded portion 50, It becomes easy to insert a welding jig between the overlapping portions adjacent in the direction. For this reason, productivity can be improved and quality of the welded portion can be improved.

  FIG. 10 is a view corresponding to FIG. 9 in the rotating electrical machine stator of the first example of the comparative example. In the first example of the comparative example shown in FIG. 10, in each of the segment coils 22 that are the stator coils in the above-described embodiments of FIGS. 1 to 9, the arrangement positions of the plurality of welds 50 that are separated in the radial direction are set in the circumferential direction. Are in the same position. That is, in the one-side coil end 46 of the stator 10, the plurality of welded parts 50 are arranged in a radial direction that is the radial direction. Other configurations are the same as those of the embodiment shown in FIGS.

  In the first example of such a comparative example, in each segment coil 22, since the welding parts 50 adjacent to each other in the radial direction are close to each other, there is room for improvement in terms of improving the insulation between the welding parts 50. 11 is a cross-sectional view of the rotating electrical machine stator of FIG. As shown in FIG. 11, in the first example of the comparative example, in the one-side coil end 46, the plurality of welded parts 50 are arranged in the radial direction, so that the interval between adjacent welded parts 50 tends to be small. For this reason, in the example of FIG. 11, the insulating paper 54 is arrange | positioned between the welding parts 50 adjacent. Further, in order to secure a space for disposing the insulating paper 54 or to secure an insulating interval between the adjacent welded portions 50 even when the insulating paper 54 is not provided, as shown in FIG. It is necessary to bend and form so that the 46 portion swells outward as it approaches both ends in the radial direction. For this reason, the radial direction (left-right direction of FIG. 11) dimension of the one side coil end 46 is large. Further, since the conductor segment 28 is bent outward, the amount of the material used for the conductor segment 28 may increase or the processing cost may increase.

  On the other hand, according to the present embodiment shown in FIGS. 1 to 9, such inconvenience can be eliminated. That is, according to the present embodiment, compared to the comparative example of FIG. 11, it is not necessary to greatly bend the outer side in order to secure the insulation interval between the welded portions 50 and the arrangement space of the insulating paper at the one-side coil end 46. The amount of the material used for the conductor segment 28 can be reduced, and the processing cost can be reduced.

  Moreover, FIG. 12 is a figure corresponding to FIG. 9 in the rotary electric machine stator of the 2nd example of a comparative example. In the second example of the comparative example shown in FIG. 12, in each of the segment coils 22 that are the stator coils in the above-described embodiments of FIGS. 1 to 9, the arrangement positions of the plurality of welds 50 that are separated in the radial direction are set in the circumferential direction. However, the structure which gradually shifts to the one side in the circumferential direction as it goes from the innermost circumferential welded portion 50 to the outermost circumferential welded portion 50 is not adopted. In the 2nd example of a comparative example, it is set as the staggered arrangement | positioning shape shifted alternately to the circumferential direction one side and the other side as it goes to the radial direction one side between several welding parts 50 separated in radial direction.

  In the second example of such a comparative example, it is difficult to insert a welding jig between the welds 50 adjacent in the circumferential direction. For this reason, there is room for improvement in terms of productivity improvement of the stator 10 and quality improvement of the welded portion 50. On the other hand, according to the present embodiment, such inconvenience can be eliminated and the productivity of the stator 10 and the quality of the welded portion 50 can be improved.

  In the present embodiment, the conductor segments 28 are not limited to those formed in a U shape, and conductor segments having various shapes can be used as long as they are formed in a coil shape by connecting a plurality of them. Can be used. In the above description, the case where the stator is a segment coil winding type has been described. However, the present invention is not limited to such a configuration, and a plurality of coil elements forming the stator coil are welded at one side coil ends. As long as the welded portions are arranged at three or more locations separated in the radial direction, the present invention can be applied to various types of stators.

  10 stator, 12 slots, 14 stator core, 16, 18, 20 segment annular part, 22 segment coil, 24 1st element, 26 2nd element, 28 conductor segment, 30 straight part, 32 leg part, 34 turn part, 36 conductor wire, 38 insulating coating, 46 one side coil end, 48 other side coil end, 50 welded part, 52 welding jig, 54 insulating paper.

Claims (2)

A stator core having slots provided at a plurality of locations in the circumferential direction;
A rotating electrical machine stator comprising a plurality of stator coils wound around the stator core,
Each stator coil is connected to the counterpart coil element at a plurality of welded portions at three or more locations separated from each other in the radial direction at a one-side coil end protruding from one axial side of the stator core. Is formed in a coil shape,
The plurality of welded portions are gradually shifted in the circumferential direction by less than ½ of the interval between the adjacent slots in the circumferential direction from the welded portion on the innermost circumferential side toward the welded portion on the outermost circumferential side. A rotating electric machine stator characterized by being arranged. The rotating electrical machine stator according to claim 1,
The stator core is wound with distributed winding, and the plurality of stator coils are connected in an annular shape, thereby forming a plurality of segment annular portions.
The segment annular portion of each phase is
A plurality of U-shaped conductor segments, which are the coil elements, are bent after being inserted into the slots of the stator core in the axial direction, and then the distal ends of the conductor segments separated from each other in the radial direction are the welded portions. A rotating electrical machine stator comprising a plurality of segment coils that are connected and formed in a coil shape.

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