JP2007037344A - Rotating electric machine including stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating electric machine including a stator capable of facilitating the joining of ends of a plurality of electrical conductors forming a stator winding to each other and the jointing of ends of a stator winding to each other, and further capable of shortening the length of each of the ends of the electrical conductors. <P>SOLUTION: The stator 10 of the rotating electric machine includes a stator core 12 of a hollow cylindrical shape formed with a plurality of slots 14; and the stator windings U, V and W formed by joining ends 21a, 21b, 31a, 31b, Ua, Va and Wa extending out from end faces of stator cores of a plurality of segments 17, 27 having rectangular shapes in cross section wound around the slots. The ends of each conductor include linear joints 42 and 47 of their ends, and a bridge continuing to the joint. A pair of one end of the joint is joined at a welded portion 50 and the other end thereof continues to the bridge. When the pair of both the ends thereof is projected on a projection plane in parallel with the short side face of the joint, an angle in the extending direction of the pairing joint does not form a zero angle, but forms a predetermined angle in a three-dimensional space on the end of the stator core. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine including a stator such as an AC generator, and more particularly to joining of ends of a plurality of conductors forming the stator winding.

  An alternator, which is a type of rotating electrical machine, includes a stator fixed to a housing, and a rotor that is rotatably supported by the housing and rotated by an external driving force. For example, a stator of a three-phase AC generator includes a stator core and three stator windings wound using the slots. One end of the three stator windings is, for example, a star connection at a neutral point, and the other end is connected to a rectifier. When the rotor rotates, an alternating current is generated in the stator winding of the stator, and this alternating current is rectified to a direct current by a rectifier and used.

  The stator winding is often formed by joining the ends of a plurality of U-shaped segments each having a pair of straight portions, a curved portion, and a pair of ends. The stator of the first conventional rotating electrical machine and the manufacturing method thereof (see Patent Document 1) show a method of forming a stator winding by joining a plurality of segments. That is, in the stator core formed by joining the stator core provided with a plurality of slots and the ends of the plurality of segments provided in the slots, the two segments joined to each other are linear portions. Are connected by a junction that intersects at a predetermined angle greater than 0 degrees. The straight portion of each segment protruding from the stator core is bent by rotating a bending member disposed on the circumferential side surface, and the leading ends thereof are butted together.

  One end of each of the three stator windings is drawn from the coil end on the end face of the stator core and joined at a neutral point joint. Here, one end of the V-phase winding intermediate in the circumferential direction extends in the axial direction of the stator core, one end of the U-phase winding on one side in the circumferential direction, and the other W-phase winding in the circumferential direction Consider a case where one end of each is joined at a neutral point joint. In this case, the drawing position of the V-phase winding from the coil end, the drawing position of the U-phase winding, and the drawing position of the W-phase winding are often separated in the circumferential direction of the stator core. Therefore, although the V-phase winding extends in the axial direction, the crossing portion extends from the drawing position of the U-phase winding to the neutral point joint, and the crossing portion extends from the drawing position of the W-phase winding to the neutral point joint. Is extended.

For example, in the stator of the AC generator of the second conventional example (see Patent Document 2), when viewed from the end face side of the stator core, the neutral point joint and the extension position of the transition portion of the U-phase winding The lead-out position of the transition part of the W-phase winding is arranged on substantially the same circle. The transition part of the U-phase winding and the transition part of the W-phase winding are arranged in a substantially circumferential direction on the end face of the stator core. In addition, the joint portion of the V-phase winding extends from the coil end in parallel to the axis of the stator core, that is, linearly, but the joint portion of the U-phase winding and the joint portion of the W-phase winding are both L-shaped. It is bent.
JP 2003-259583 A JP 2001-286082 A

  In the stator of the rotating electrical machine according to the first conventional example, when the stator core is viewed from the outer peripheral surface side, the straight portions of the two segments joined to each other intersect at an angle larger than 0 degrees. Here, the front end surface of the straight portion of one segment and the inner surface of the portion slightly receding from the front end surface of the straight portion of the other segment are joined all over, and therefore the second end of the stator core is viewed from the outer peripheral surface. The angle formed by the two straight portions is limited to 90 degrees or an angle close thereto. In this case, there is a limit to shortening the length of the straight portion in the circumferential direction, and the electrical resistance of the segment is not reduced so much.

  In addition, the angle formed by the straight line portion of one segment and the straight line portion of the other segment is 0 degree in the end view of the stator core. However, there are various patterns for extracting the segments from the slots in the circumferential direction and the radial direction of the stator core, and if the angle formed by the two linear portions is 0 degrees, it may be inconvenient for joining the linear portions. is there.

  In the stator of the alternator of the second conventional example, the U-phase winding located on one side in the circumferential direction is formed on one side surface of the linear end of the V-phase winding located in the middle in the circumferential direction. The side surface of one end of the L-shape is joined, and the side surface of one end of the L-shape of the W-phase winding located on the other side in the circumferential direction is joined to the other side surface of the linear one end of the V-phase winding. At that time, the side face of one end of the U-phase winding and one side face of the V-phase winding are brought into contact with each other, and the side face of one end of the W-phase winding and the other side face of the V-phase winding are brought into contact with each other.

  In this case, for example, when the direction or position of one end of the U-phase winding is shifted with respect to one end of the V-phase winding, processing for bringing the side surfaces into contact with each other is troublesome. In particular, depending on the winding method of the stator winding, the drawing position of the V-phase winding, the drawing position of the U-phase winding, and the drawing position of the W-phase winding are on the same circle on the end face of the stator core. There is a case where it is not located at the position and is displaced in the radial direction. In this case, the amount of bending and twisting at one end of the U-phase winding tends to be particularly large.

  For example, when the L-shaped end of the U-phase winding is separated in the circumferential direction with respect to the linear end of the V-phase winding as viewed from the outer peripheral surface, one end of the U-phase winding is used as one end of the V-phase winding. In order to make contact with the surface, it is necessary to bend the middle of the tip half of the L-shaped one end (portion joined to the joint of the V-phase winding). In addition, when the extending direction of one end of the V-phase winding and the extending direction of one end of the U-phase winding are not parallel to each other and form a predetermined angle when viewed from the end face, It is necessary to twist the entire half of the L-shaped tip side around an axis parallel to the extending direction.

  Also, in order to bend and twist one end of the U-phase winding while bending or twisting one end of the U-phase winding to bring one end of the U-phase winding into contact with one end of the V-phase winding. Since one end of the U-phase winding abuts against one end of the V-phase winding in a relatively narrow area against the required force, the side surface of the V-phase winding is easily damaged.

  Further, the L-shaped joint portion of the U-phase winding and the W-phase winding has a portion extending in the axial direction and a portion extending in the circumferential direction. As a result, the length of the stator winding is increased by the L-shaped joint, and the electrical resistance is increased.

  The present invention has been made in view of the above circumstances, and can easily join the ends of a plurality of conductors forming the stator windings and the ends of the stator windings, and the length of the ends of the conductors. An object of the present invention is to provide a rotating electric machine including a stator that can shorten the length of the rotating electric machine.

  The inventor of the present application has completed the present invention, paying attention to the fact that it is not indispensable to join the end portions over the entire surface in order to ensure the necessary joint strength when joining the end portions of the conductors.

(1) A rotating electrical machine including the stator according to the first aspect of the present invention has a hollow cylindrical stator core formed with a plurality of slots and a rectangular cross-sectional shape wound around the slots. In a rotating electrical machine including a stator having a stator winding formed by joining end portions extending from end faces of a stator core of a plurality of conductors,
The end of each conductor includes a linear joint at the tip and a transition part continuous to the joint, one end of the joint part forming a pair is joined at the weld, and the other end of the joint is continued to the transition part, When projected onto a projection plane parallel to the first side surface of the joint, the angle formed by the extending direction of the pair of joints is not 0 degrees.

(2) The rotating electrical machine including the stator according to the second aspect of the present invention has a hollow cylindrical stator core formed with a plurality of slots and a rectangular cross-sectional shape wound around the slots. In a rotating electrical machine including a stator having a stator winding formed by joining end portions extending from end faces of a stator core of a plurality of conductors,
The end of each conductor includes a linear joint at the tip and a transition part continuous to the joint, one end of the joint part forming a pair is joined at the weld, and the other end of the joint is continued to the transition part, When projected onto a projection plane parallel to the second side surface of the joint, the angle formed by the extending direction of the pair of joints is not 0 degrees.

(3) A rotating electrical machine including the stator according to the third aspect of the present invention has a hollow cylindrical stator core formed with a plurality of slots and a rectangular cross section wound around the slots. In a rotating electrical machine including a stator having a stator winding formed by joining end portions extending from end faces of a stator core of a plurality of conductors,
The end of each conductor includes a linear joint at the tip and a transition part continuous to the joint, one end of the joint part forming a pair is joined at the weld, and the other end of the joint is continued to the transition part, When projected onto a projection plane perpendicular to the extending direction of the joint, the angle formed by the pair of joints is not 0 degrees.

  According to a fourth aspect of the present invention, each conductor is composed of a plurality of segments. In the rotary electric machine according to the fifth aspect, both ends of a segment forming a stator winding of a predetermined phase are joined. The rotating electrical machine according to claim 6 includes a plurality of winding portions in which stator windings of a predetermined phase are connected in series, one end of a segment at one end of the first winding portion and a segment at one end of the second winding portion. Is joined to one end. The rotating electrical machine according to claim 7 includes a three-phase stator winding, one end of the segment at one end of the first phase stator winding, one end of the segment at one end of the second phase stator winding, and a third One end of the segment at one end of the phase winding is joined.

  In the rotary electric machine according to claim 8, each conductor is formed of a continuous line. According to a ninth aspect of the present invention, the stator winding of the predetermined phase includes a plurality of winding portions connected in series, and one end of the first winding portion and one end of the second winding portion are joined. The rotating electrical machine according to claim 10 includes a three-phase stator winding, wherein one end of the first phase stator winding, one end of the second phase stator winding, and one end of the third phase winding are joined. Yes. In the rotating electrical machine of the eleventh aspect, the second side surface of the other joint is joined to the second side surface of the first joint. In the rotating electrical machine according to claim 12, the first side surface of the other joint is joined to the first side surface of the first joint. In the rotating electrical machine according to the thirteenth aspect, a corner portion of the other joint portion is joined to one joint portion.

(4) The rotating electrical machine including the stator according to the fourth aspect of the present invention has a hollow cylindrical stator core formed with a plurality of slots and a rectangular cross section wound around the slots. In a rotating electrical machine having a stator including a stator winding formed by joining end portions extending from end faces of a stator core of a plurality of conductors,
The end portion of the conductor includes a straight joint portion at the tip and a transition portion continuous to the joint portion, and when projected onto a projection plane perpendicular to the extending direction of the joint portion, the first side of the joint portion of each conductor The angle formed by the extending direction of the crossing portion with respect to the side surface is not 0 degree. When the rotating electrical machine according to claim 15 is projected onto a projection plane perpendicular to the extending direction of the joint, the angle formed by the pair of joints is not 0 degrees.

  (1) According to the rotating electrical machine including the stator of claim 1, the stator winding is formed when projected onto a projection plane parallel to the first side surface of the joint (when viewed from the outer peripheral surface of the stator core). The angle formed by the extending direction of the joint portion forming the pair of conductors is not 0 degrees, but is a predetermined angle. As a result, only the front end of the joint can be partially contacted, and the circumferential length of the joint can be shortened without increasing the number of bending steps, compared to the case where the angle formed by the pair of joints is 0 degrees. As a result, the length of the stator winding can be shortened, and the electrical resistance is reduced accordingly. Further, the rigidity in the tilting direction of the joint, that is, the circumferential direction of the stator core or the slot separating direction is improved. Furthermore, only one tip of the pair of joints can be partially brought into contact with the other.

  According to the rotating electrical machine including the stator of claim 2, the extension of the joint part forming a pair when projected onto a projection plane parallel to the second side surface of the joint part (in the radial cross-sectional view of the stator core) Since the direction forms a predetermined angle, only the tip of the joint can be partially abutted, and the joint can be easily joined even if the extension position of the crossover is shifted, and the joint can be easily joined without increasing the number of bending steps. The length can be shortened. Moreover, the rigidity in the tilting direction of the joint, that is, the radial direction of the stator core is improved.

  According to the rotating electrical machine including the stator according to claim 3, since the joint part forming a pair forms a predetermined angle when projected onto a projection plane perpendicular to the extending direction of the joint part (when viewed from the end surface of the stator core), Only the front end portion of the joint portion can be partially abutted, and the joint portion can be easily joined even if the drawing position from the end face of the stator core of the transition portion is shifted.

  According to the rotating electric machine of claim 5, when joining the joining portions of the segments forming the stator winding of the predetermined phase, it is possible to cope with the shift of the drawing position of the transition portion and to shorten the length of the joining portion. . According to the rotating electrical machine of claim 6, when connecting the joint portions of the segments forming the winding portions connected in series with each other of the stator windings of the predetermined phase, it is possible to cope with a shift in the drawing position of the crossover portion, The length of the joint can be shortened. According to the rotating electrical machine of claim 7, when connecting the joint portions of the segments connected to the neutral point where each one end of the three-phase stator winding is joined, the shift position of the connecting portion is shifted. In addition, the length of the joint can be shortened.

  According to the rotating electrical machine of the ninth aspect, when joining the joint portions of the segments forming the stator winding of the predetermined phase, it is possible to cope with the shift of the drawing position of the transition portion, and to shorten the length of the joint portion. . According to the rotating electrical machine of claim 10, when connecting the joint portions of the segments forming the winding portions of the stator windings of the predetermined phase connected in series with each other, it is possible to cope with a shift in the drawing position of the crossover portion, In addition, the length of the joint can be shortened.

  According to the rotating electrical machine of the eleventh aspect, when the joining portions forming a pair are arranged so as to overlap in the circumferential direction of the stator core, it is possible to cope with the shift of the drawing position of the transition portion and to shorten the length of the joining portion. . According to the rotating electrical machine of the twelfth aspect, when the joint portions forming a pair are arranged in the radial direction, it is possible to cope with the shift of the pull-out position of the crossover portion and to shorten the length of the joint portion. According to the rotating electrical machine of the thirteenth aspect, the corner portion of the other joining portion is joined to the side surface of the one joining portion. According to such joining, for example, the side surface including the second side of the pair of joining portions. Even when they are separated from each other in the circumferential direction of the stator core, the plane including the first side and the second side of the one joint are included by twisting one of the joints around the axis. The corner portion intersecting with the plane can approach the side surface of the other joint portion to increase the distance from the side surface.

  According to the rotating electric machine of the fourteenth aspect, the angle formed by the extending direction of the crossing portion with respect to the first side surface of the joint portion is not 0 ° but a predetermined angle. As a result, the crossing portions forming a pair form a predetermined angle with respect to the circumferential direction of the stator core, so that even if the pulling positions of the crossing portions forming the pair are shifted, they can be easily joined. According to the rotary electric machine of the fifteenth aspect, since the extending direction of the joining portion forms a predetermined angle, the joining portion can be easily joined even when the drawing position from the end face of the stator core of the transition portion is deviated.

<Various aspects>
(Rotating electric machine including stator)
The stator of the rotating electrical machine according to the present invention includes a stator core formed with a plurality of slots and a plurality of stator windings wound around the slots. Each stator winding may consist of a plurality of electrical conductors (eg, U-shaped segments with a rectangular cross-section) joined together or consist of a continuous line. The segment includes a pair of straight portions, a curved portion at one end of the straight portion, and a pair of ends at the other end of the straight portion.

  There are three types of segments or continuous lines that are joined together. Note that, regardless of whether the stator winding is composed of a plurality of segments or continuous lines, the situation regarding the joining of one end is substantially the same, so the joining of one end of the segment will be described below. Note that one end of the segment or the like basically extends in the axial direction from the end face of the stator core, and the extending direction of the joint portion substantially corresponds to the axial direction of the stator core. The first type is a plurality of (two or three or more) segments forming a pair forming a stator winding of a predetermined phase. A predetermined number of stator windings are completed by sequentially joining one end of the plurality of segments. The second type includes a segment at one end of the first winding portion and the second winding portion when a plurality of (two or three or more) winding portions connected in series with a stator winding of a predetermined phase are included. Is a segment at one end of By joining one end of the segment at one end of the first winding portion and one end of the segment at one end of the second winding portion, the first winding portion and the second winding portion are connected in series. The same applies to the relationship between the second winding portion and the third winding portion, and the relationship between the second winding portion and the third winding portion.

  The third type relates to a segment joined at a neutral point joint when a three-phase stator winding is included. One end of the segment at one end of the first phase stator winding and one end of the segment at one end of the second phase stator winding are joined, and one end of the segment at one end of the first phase stator winding and the third phase One end of the segment at one end of the stator winding is joined. As a result, one end of the first phase stator winding, one end of the second phase stator winding, and one end of the segment of one end of the third phase stator winding are joined together. In addition, the length of the transition part can be lengthened compared with the other segments of these segments joined at a neutral point. In the case of a continuous line, there are a second type and a third type in the case of the segment.

  The end portion of the conductor includes a joint portion at the tip and a transition portion continuous to the joint portion. One end of the joined portion is welded at the welded portion, and the other end is continuous with the crossover portion. Next, the angle formed by the extending direction of the joint part forming the pair of conductors joined to each other and the angle formed by the joint part forming the pair of conductors joined to each other will be described with reference to segments. Basically, the angle formed by the extending direction of the joint portion forming a pair of segments joined to each other is not 0 degree. Here, “the angle formed is not 0 degree” means that both the extending directions do not match and are not parallel.

  There are cases where the angle formed by the pair of joints is viewed from three directions. First, the angle when projected onto a projection plane parallel to the side surface of the first side of the joint (for example, the short side of the rectangular cross section defined by the short side and the long side). Second, the angle formed by the extending direction of the pair of joints is the angle when projected onto a projection plane parallel to the side surface of the joint on the second side (for example, the long side orthogonal to the short side of the rectangular cross section). It is.

  Thirdly, the angle formed by the paired joints is an angle when projected onto a projection plane perpendicular to the extending direction of the joints (height direction of the joints). Here, when projected onto a projection plane parallel to the first side surface of the joint and a projection plane parallel to the second side surface of the joint, an angle formed by the extending direction of the pair of joints is formed. In this case, the “extending direction of the joint portion” means a bisector of an angle formed by the extending directions of both joint portions.

  The condition that “the angle formed by the extending direction of the paired joints is not 0 degree” or “the angle formed by the paired joints is not 0 degree” is that the projection is performed on at least one of the projection planes. It only has to be satisfied. Therefore, it may be satisfied when projected onto any two projection planes, or may be satisfied when projected onto three projection planes.

  There are four types of methods for joining the segment joints. Here, the extension direction of the joint part of the segment from the end face of the stator core is called the “height direction” of the joint part as necessary, and the short side direction of the joint part having a rectangular cross section (the circle of the stator core) The circumferential direction) is called “thickness direction” as necessary, and the long side direction (radial direction of the stator core) is called “width direction” as necessary. In the first type, the long side surface of the other joint is joined to the long side surface (one surface in the thickness direction) of one joint, and the two joints overlap in the circumferential direction of the stator core. Are arranged. The entire side surface of the long side may be joined, but only a part thereof may be joined as long as the required joining strength is ensured.

  In the second type, the short side surface of the other joint is joined to the short side surface (one surface in the width direction) of one joint, and the two joints are arranged side by side in the radial direction of the stator core. Yes. The entire side surface of the short side may be joined, but only a part thereof may be joined as long as necessary joining strength is ensured. In the third type, the short side surface of the other joint is joined to the long side surface of the one joint. The first type and the second type are joints between side surfaces having the same length, and the third type is a joint between side surfaces having different lengths.

  In the 4th type, the corner of the other joined part is joined to one joined part. Here, the corner portion of the other joint portion may be joined to any of the short side surface, the long side surface, or the corner portion of the one joint portion. In the first to fourth types, for example, arc welding can be used for joining the joints.

  The extending direction of the crossing portion of the conductor such as the segment will be described. When projected onto a projection plane perpendicular to the extending direction of the joint portion, the angle formed by the extending direction of the crossover portion with respect to the first side surface of the joint portion is not 0 degree. The crossing portion that forms a pair can form a predetermined angle with the circumferential direction (tangential direction) of the stator core, which is the radial position or axial direction of the stator core at the extension position of the crossing portion of the paired segment. Useful for dealing with misalignment. In addition, although it is desirable for the extension direction of a junction part to make a predetermined angle, it is not essential.

<First Embodiment>
(A) Stator and stator winding FIGS. 1 to 8 show a first embodiment of the present invention. As shown in FIG. 1 which is a cross section of a main part of an AC generator for a vehicle, the AC generator has a stator 10 acting as an armature, a rotor 50 acting as a field, a front housing 61 and a rear housing 62, an alternating current And a rectifier 65 that converts electric power into DC power. The stator 10 will be described later. The rotor 50 rotates integrally with the shaft 51 and includes a Landel pole core 52, a field coil 53, a slip ring 54, a mixed flow fan 56, and a centrifugal fan 57. The Landel-type pole core 52 is configured by combining a pair of pole cores 52a and 52b. The shaft 51 is connected to a pulley 58 and is rotationally driven by a traveling engine (not shown) mounted on the automobile. The housings 61 and 62 support the rotor 50 and sandwich the stator 10. The rectifier 65 is provided at the end on the side opposite to the pulley of the vehicle alternator.

  As shown in FIG. 1 and FIG. 2, which is a partial cross-sectional view of the stator 10, the stator 10 is a stator core 12, and a fixed structure constituted by a plurality of electric conductors arranged in the slots 13 of the stator core 12. The stator windings U, V, and W, and the insulator 16 that electrically insulates between the stator core 12 and the electrical conductors 18a, 18b, 28a, and 28b. Electrical conductors are then provided by segments 17 and 27 shown in FIG.

  Specifically, as shown in FIG. 2, the stator core 12 is formed with a plurality of slots 14 penetrating in the axial direction at a predetermined depth in the radial direction, and each slot 13 has four electric conductors 18a, 18b, 28a and 28b are accommodated. The plurality of electric conductors 18a, 18b, 28a and 28b are provided by two large and small segments 17 and 27, each of which is formed by forming a copper wire having a rectangular cross section into a U shape, as shown in FIG. The large segment 17 includes a pair of linear portions 18a and 18b, a turn portion 19 on one end side of the pair of linear portions, and a pair of end portions 21a and 21b on the other end side of the pair of linear portions. Each end 21a and 21b includes bent portions 22a and 22b and joints 23a and 23b.

  Similarly, the small segment 27 includes a pair of linear portions 28a and 28b, a turn portion 29 on one end side of the pair of linear portions, and a pair of end portions 31a and 31b on the other end side of the pair of linear portions. Each end 31a and 31b includes bent portions 32a and 32b and joint portions 33a and 33b. The four electric conductors 18a, 28a, 28b, and 18b are arranged in a line from the inner side to the inner end layer, the inner middle layer, the outer middle layer, and the outer end layer with respect to the radial direction of the stator core 12, and these electric conductors are predetermined. U-phase stator winding (hereinafter referred to as “U-phase winding” as necessary) U, V-phase stator winding (hereinafter referred to as “V-phase winding as necessary”) ) V and W-phase stator winding (hereinafter referred to as “W-phase winding” if necessary) W.

  The connection state of each phase stator winding is shown in FIG. The outer end layer 18b is indicated by a one-dot chain line, the outer middle layer 28b is indicated by a broken line, the inner middle layer 28a is indicated by a solid line, and the inner end layer 18a is indicated by a two-dot chain line. One electrical conductor in each slot 14 is paired with one other electrical conductor in another slot 14 that is a predetermined magnetic pole pitch apart. For example, the inner end layer electric conductor 18a in one slot 14 is paired with the outer end layer electric conductor 18b in another slot 14 which is one pole pitch away in the clockwise direction of the stator core 12. Yes. Similarly, the inner and middle layer electric conductors 28a in a certain slot 14 are paired with the outer and middle layer electric conductors 28b in another slot 14 which are separated by one magnetic pole pitch in the clockwise direction of the stator core 12.

  These paired electrical conductors are connected by way of the turn portions 19 and 29 at one end 13a in the axial direction of the stator core 12. Therefore, at one end portion 13a of the stator core 12, the turn portion 29 that connects the outer middle layer electric conductor 28b and the inner middle layer electric conductor 28a is connected to the outer end layer electric conductor 18b and the inner end layer electric conductor 18a. The turn part 19 which connects is surrounded. One coil end 15 a is formed by the plurality of turn portions 19 and 29.

  Further, these electric conductors are connected to each other at the other end 13b of the stator core 12 in the axial direction. The side surface of the joint portion 41a connecting the side surface of the joint portion 23b of the end portion 21b of the electric conductor 18b of the outer end layer and the joint portion 33b of the end portion 31b of the electric conductor 28b of the outer middle layer, and the electric conductor 18a of the inner end layer. A side surface of the joint portion 41b connecting the side surface of the joint portion 23a of the end portion 21a and the joint portion 33a of the end portion 31a of the inner middle layer electric conductor 28a is aligned in the radial direction. The other coil end 15b is formed by the plurality of joint portions 41a and 41b.

  As shown in FIGS. 4 and 5, the large segment 17 and the small segment 27 are arranged and joined in the slot 13 to form a U-phase stator winding U that makes two rounds around the stator core 12. The first circumference forms the first winding part U1, the second circumference forms the second winding part U2, and the two winding parts U1 and U2 are connected in series at U1a and U2a. Yes. Specifically, the segment at one end of the first winding portion U1 and the segment at one end of the second winding portion U2 are joined. Similarly, a V-phase winding V and a W-phase winding W are formed. The U-phase winding U, the V-phase winding V and the W-phase winding W are formed in slots whose phases are different from each other by 120 degrees.

  On one coil end 15a side of the stator core 12, one end Ua of the U-phase winding U, one end Va of the V-phase winding V, and one end Wa of the W-phase winding W are joined at a neutral point N. The other end Ub of the U-phase winding U, the other end Vb of the V-phase winding V, and the other end Wb of the W-phase winding W are connected to a rectifier 65.

  Hereinafter, the neutral point N and its periphery will be described with reference to FIGS. 6 is a view of the outer surface of the stator core, FIG. 7 is a view of the end of the stator core, and FIG. 8 is a radial cross-sectional view of the stator core. One end of the V-phase winding V (hereinafter referred to as “V-phase one end”) Va includes a joint portion 42 at the tip and a transition portion 43 continuous to the joint portion 42 via a boundary portion (bending portion) 44. One end (hereinafter referred to as “U-phase one end”) Ua of the U-phase winding U includes a joint portion 45 at the tip and a transition portion 46 continuous thereto. One end of the W-phase winding W (hereinafter referred to as “one W-phase end”) Wa includes a joint portion 47 at the tip and a transition portion 48 continuous to the joint portion 47 via a boundary portion (bending portion) 49.

  6 projected onto a plane p orthogonal to the extending direction of the joint (vertical direction in FIG. 6 (a)), the U-phase end Ua of the U-phase one end Ua with respect to the drawing position Vc of the transition portion 46 of the V-phase one end Va in FIG. The pull-out position Uc of the transition part 43 is located on the radially inner side of the stator core 12, and the pull-out position Wc of the transition part 48 at the W-phase one end Wa is located on the radially outer side. In the circumferential direction of the stator core 12, the joint 45 of the V-phase one end Va is located in the middle, the joint 42 of the U-phase one end Ua is located on one side, and the joint 47 of the W-phase one end Wa is on the other side. positioned. Three junctions 42, 45 and 47 are joined to form a neutral point junction N.

  More specifically, in the outer peripheral surface view shown in FIGS. 6A and 6B projected onto the plane q parallel to the short side 45a of the joint 45 in FIG. 7, the extending direction of the joint 45 of the V-phase end Va ( 6 (b), the linear joint 42 of the U-phase one end Ua forms a predetermined angle on one side of the stator core 12 in the circumferential direction (leftward in FIG. 6 (b)). It is extended.

  The crossing portion 43 forms an obtuse angle with respect to the joint portion 42, that is, bends in the thickness direction and is connected by a bent portion 44. One surface of the joint portion 45 of the V-phase one end Va and one surface of the joint portion 42 of the U-phase one end Ua are welded by the weld 50 near the upper end in the height direction. One end of the joint portion 42 is welded by the welded portion 50, and the other end is continuous with the transition portion 43.

  The linear joint 47 at one end Wa of the W phase extends at a predetermined angle to the other side in the circumferential direction of the stator core 12 with respect to the joint 45. 48 forms an obtuse angle and is connected by a bent portion 49. The other surface of the joint portion 45 of the V-phase one end Va and the one surface of the joint portion 47 of the W-phase one end Wa are welded by the welded portion 50 near the upper end in the height direction. One end of the joint portion 47 is welded by the welding portion 50, and the other end is continuous with the transition portion 48.

  7A and 7B, the joint 45 of the V-phase one end Va, the joint 42 of the U-phase one Ua, and the joint 47 of the W-phase one Wa are parallel. The crossing portion 43 is bent radially inward (leftward in FIG. 7B), that is, in the width direction by the bent portion 44 with respect to the joint portion 42 of the U-phase one end Ua. In addition, since the joining portion 42 forms a predetermined angle with respect to the joining portion 45 in the outer peripheral surface view of FIG. 6, the bent portion 44 is slightly separated in the circumferential direction from the joining portion 45 of the V-phase one end Va in the end view of FIG. ing.

  Further, the crossing portion 48 is bent radially outward (rightward in FIG. 7B), that is, in the width direction by the bent portion 49 with respect to the joint portion 47 of the one end Wa of the W phase. The crossover 48 extends at a predetermined angle outward in the radial direction of the stator core 12 with respect to the thickness direction. The bent portion 49 is slightly separated from the joint portion 45 in the circumferential direction in the end view. The joint part 42 and the joint part 47 are parallel in an end view shown in FIGS.

  Further, in FIG. 7A, the joint portion of the V-phase one end Va in the radial cross-sectional view shown in FIG. 8A projected onto a plane r parallel to the long side 45b orthogonal to the short side 45a of the joint portion 45 in FIG. With respect to the height direction of 45 (upward in FIG. 8A), the joint 42 of the U-phase one end Ua extends in the same direction as the joint 45 (upward in FIG. 8A) and is projected. In the figure, they overlap. Further, the joint portion 47 of the W-phase one end Wa extends in the same direction as the joint portion 45 (upward in FIG. 8A) with respect to the height direction of the joint portion 45, and overlaps in the projection view. .

(B) Joining Method Next, a joining method of the U-phase one end Ua, the V-phase one end Va, and the W-phase one end Wa in the neutral point joint N in the first embodiment will be described. The U-phase one end Ua and the W-phase one end Wa are brought close to the V-phase one end Va, and the U-phase one end Ua and the W-phase one end W are set slightly apart from the V-phase one end Va. Next, starting from the bent portion 44 of the U-phase one end Ua, the connecting portion 42 is deformed in the thickness direction, that is, the circumferential direction of the stator core 12, and the width direction thereof, that is, the fixed core 12. Bend in the radial direction. 6A and 6B, the height direction of the joint portion 42 and the height direction of the joint portion 45 form a predetermined angle as viewed from the outer peripheral surface of FIG. 6A and FIG. Thus, the thickness direction of the joining portion 42 and the extending direction of the crossing portion 43 form a predetermined angle.

  Similarly, the joint portion 47 is deformed in the thickness direction, that is, the circumferential direction of the stator core 12 from the bent portion 49 of the W-phase one end Wa, and the width direction thereof, that is, the fixed core 12 is Bend in the radial direction. Thereby, the height direction of the joint portion 47 and the height direction of the joint portion 45 form a predetermined angle in the outer peripheral surface view, and the thickness direction of the joint portion 47 and the extending direction of the crossing portion 48 in the end surface view are formed. A predetermined angle is formed.

  As a result, the height direction of the joint portion 42 and the height direction of the joint portion 47 form a predetermined angle when viewed from the outer peripheral surface of FIGS. 7A and 7B, the extending direction (circumferential direction) of the crossover portion 43 and the extending direction (circumferential direction) of the crossover portion 48 are parallel to each other. Next, the three joint portions 42, 45 are welded by sandwiching the joint portion 45 of the V-phase one end Va from both sides in the circumferential direction between the joint portion 42 of the U-phase one end Ua and the joint portion 47 of the W-phase one end Wa. And 47 are joined.

(C) Effects According to the stator winding of the first embodiment, the following effects can be obtained. First, in the end view of FIGS. 7A and 7B, the drawing position Vc of the V-phase one end Va, the drawing position Uc of the U-phase one end Ua, and the drawing position of the W-phase one end Wa in the radial direction of the stator core 12. It is possible to easily cope with the radial shift of the joint portions 42, 45, and 47 caused by the difference from Wc. This is because the transition portion 43 of the U-phase one end Ua bends inward in the radial direction at the bent portion 44 with respect to the joint portion 42, and the transition portion 48 of the W-phase one end Wa has a radius at the bent portion 49 with respect to the joint portion 47. This is because it is bent outward in the direction.

  Secondly, the lengths of the joint portion 42 and the joint portion 47 can be shortened. As a result, the length of the U-phase one end Ua and the length of the U-phase winding U can be shortened, and the electrical resistance can be reduced. This is because the conventional joint portion is bent in an L shape, whereas the joint portion 42 and the joint portion 47 of the first embodiment extend linearly and form an obtuse angle with respect to the transition portions 43 and 48. This is because only the upper edge is joined to the joint 45. As a result, in the radial direction, the circumferential direction, and the axial direction of the stator core 12, the leading ends of the crossover portion 43 and the crossover portion 48 and the joint portion 45 are connected with the shortest distance.

  Third, only the tip (upper end) of the three joints 42, 45, and 48 is joined by the weld 50, and the other parts are separated from each other. Are easily drained downward.

  According to the stator winding joining method of the first embodiment, first, the U-phase one end Ua and the W-phase one end Wa are set slightly apart in the circumferential direction of the stator core 12 with respect to the V-phase one end Va, Thereafter, the joint portions 42 and 47 are deformed in the thickness direction and the width direction. As a result, the joints 42 and 47 are moved in the radial direction with respect to the joint 45 in accordance with the deviation of the withdrawal position Vc of the V-phase one end Va, the withdrawal position Uc of the U-phase one end Ua, and the withdrawal position Wc of the W-phase one end Wa. It can be deformed in the height direction.

<Modification>
In the first embodiment, since the joint portion 42 of the U-phase one end Ua forms a predetermined angle with respect to the joint portion 45 of the V-phase one end Va as viewed from the outer peripheral surface of FIGS. 6 (a) and 6 (b), FIG. a) The bent portion 44 of the U-phase one end Ua is slightly separated from the joint portion 45 in the end view of (b). However, the angle formed by the joint portion 100 of the U-phase one end Ua and the W-phase one end Wa with respect to the joint portion 105 of the V-phase one end Va in the outer peripheral surface view is 0 degree, that is, the front surface 101 of the joint 100 is joined. It can also be brought into close contact with the rear surface 106 of 105. In this case, the bent portion 104 bent in the width direction of the U-phase one end Ua in the end view shown in FIG. 9 is positioned in the immediate vicinity of the joint portion 105 of the V-phase one end Va.

  As shown in FIGS. 7C and 8B, the bent portion 44 of the U-phase one end Ua is bent only in the thickness direction and not bent in the width direction. The joint 45 of the phase end Va may extend at a predetermined angle on the radially inner side of the stator core 12. Further, the bent portion 49 of the W-phase one end Wa is bent only in the thickness direction and is not bent in the width direction. Instead, the joint portion 47 is connected to the joint portion 45 of the V-phase one end Va with respect to the stator core 12. A predetermined angle is extended outward in the radial direction.

  In this case, the joint portion 42 of the U-phase one end Ua extends inward in the radial direction of the stator core 12, and the transition portion 43 is positioned inward of the stator core 12 in the radial direction with respect to the joint portion 45. Further, the joint portion 47 of the W-phase one end Wa extends outward in the radial direction of the stator core 12, and the crossover portion 48 is positioned radially outward of the stator core 12 relative to the joint portion 45.

Second Embodiment
In the second embodiment shown in FIG. 10, the joint portion 110 is not bent in the width direction with respect to the transition portion 113 in the end surface view of the stator core 12, but the front surface 111 of the joint portion 110 is inclined in a predetermined direction. ing. The inclination direction of the front surface 111 is a direction in which the thickness of the joint portion 110 is thin on the inner side (left side) in the width direction and the outer side (right side) in the width direction is thicker. As a result, the entire inclined front surface 111 of the joint portion 110 of the U-phase one end Ua abuts the entire rear surface 116 of the joint portion 115 of the V-phase one end Va in the end view, and the thickness direction of the joint portion 115 A crossing portion 113 extending in the circumferential direction forms a predetermined angle.

  In addition, the outer peripheral surface view and radial direction sectional view of 2nd Embodiment are the same as 1st Embodiment. The relationship between the V-phase one end Va and the W-phase one end Wa is the same as the relationship between the V-phase one end Va and the U-phase one end Ua. According to the second embodiment, in addition to the same effects as those of the first embodiment, it is not necessary to form a bent portion at the U-phase one end Ua and the W-phase one end Wa.

<Third Embodiment>
In the third embodiment shown in FIGS. 11 and 12, the joint 120 is not bent in the width direction with respect to the transition part 122 of the U-phase one end Ua in the end view of the stator core 12. It is slightly twisted clockwise around an axis X parallel to the short side. As a result, as can be seen from the perspective view shown in FIG. 12, the extending direction of the joint portion 120 and the extending direction of the joint portion 125 form a predetermined angle in a radial cross-sectional view (see FIG. 8). Further, the cross-sectional portion 122 extending in the circumferential direction of the U-phase one end Ua makes a predetermined angle with respect to the thickness direction (vertical direction in FIG. 11) of the joint portion 125 of the V-phase one end Va in the end view shown in FIG. It is made.

  In addition, the outer peripheral surface view and radial direction sectional view of 3rd Embodiment are the same as 1st Embodiment. As a result, as shown in FIG. 12, the side surface of the joint portion 120 is in contact with the side surface of the joint portion 125 in a hatched region. The relationship between the V-phase one end Va and the W-phase one end Wa is the same as the relationship between the V-phase one end Va and the U-phase one end Ua. According to the third embodiment, in addition to the same effects as those of the first embodiment, it is not necessary to form a bent portion or an inclined surface at the U-phase one end Ua and the W-phase one end Wa.

<Fourth embodiment>
In the fourth embodiment shown in FIGS. 13 and 14, the joint portion 130 of the U-phase one end Ua is not bent in the width direction with respect to the transition portion 132 in the end view of the stator core 12. It is twisted slightly clockwise around an axis Y extending in the extending direction. As a result, the cross section 132 extending in the circumferential direction of the U-phase one end Ua forms a predetermined angle with respect to the thickness direction of the joint 135 of the V-phase one end Va in the end view of FIG. The width direction of the joint 130 forms a predetermined angle with respect to the width direction.

  In addition, the outer peripheral surface view and radial direction sectional view of 4th Embodiment are the same as 1st Embodiment. The relationship between the V-phase one end Va and the W-phase one end Wa is the same as the relationship between the V-phase one end Va and the U-phase one end Ua. According to the third embodiment, in addition to the same effects as those of the first embodiment, it is not necessary to form a bent portion or an inclined surface at the U-phase one end Ua and the W-phase one end Wa.

  In the modification of the fourth embodiment shown in FIG. 15, the joint 140 is twisted around an axis parallel to the short side with respect to the joint 145 and twisted around an axis extending in the extending direction. Yes.

<Fifth Embodiment>
The fifth embodiment shown in FIG. 16 is different from the first to fourth embodiments in the joint 150 of the U-phase one end Ua and the joint 158 of the W-phase one end Wa with respect to the joint 155 of the V-phase one end Va. The positional relationship is different. That is, the joint portion 150 of the U-phase one end Ua is disposed on the inner side in the width direction of the joint portion 155 of the V-phase one end Va, and the width-direction surface (outer surface) of the joint portion 150 is disposed on the width-direction surface (inner surface) 156 of the joint portion 155. ) 151 is joined. A bent portion 154 that bends outward in the radial direction of the stator core 12 is formed in the transition portion 152 of the U-phase one end Ua. Note that the joint portion 158 of the W-phase one end Wa is arranged on one side in the thickness direction of the joint portion 155 of the V-phase one end Va in the circumferential direction of the stator core 12 as in the first embodiment.

  As a modified example of the fifth embodiment, the joint portion 155 and the joint portion 150 may be arranged so as to form a predetermined angle instead of being parallel in an end view. For this purpose, the side surface of the joint portion 155 and the side surface of the joint portion 150 may form a predetermined angle. In addition, as shown in FIG. 17, the joint 160 of the W-phase one end Wa is disposed outside the joint 155 of the V-phase one end Va, and a bent part 164 is formed between the joint 160 and the crossing part 162. To do. One surface (inner surface) 161 in the width direction of the joint 160 is joined to the other surface (outer surface) 157 in the width direction of the joint 155.

  According to the fifth embodiment and the modification thereof, the joint portion 155 of the U phase one end Ua and / or the joint portions 158 and 160 of the W phase one end Wa are arranged inward or outward in the width direction with respect to the joint portion 155 of the V phase one end Va. When arranged in the same manner, the same effect as in the first embodiment can be obtained.

<Sixth Embodiment>
In the said 1st Embodiment to 5th Embodiment, this invention was applied to joining of three junction parts. However, the present invention can also be applied to the joining of two joints 171 and 176 as shown in FIGS. For example, this is a case where one end 170 of one segment forming the U-phase winding and one end 180 of another segment are joined (see the joints 41a and 41b in FIG. 3 in the first embodiment). .

  On the other hand, the end portion 170 includes a joint portion 171 and a crossover portion 172, and the joint portion 171 has a thickness direction axis parallel to the short side with respect to the crossover portion 172 when viewed from the end surface of the stator core 12 (see FIG. 18). Twisted into. The other end portion 175 includes a joint portion 176 and a crossover portion 177, and the joint portion 171 around the thickness direction axis parallel to the short side with respect to the crossover portion 177 in the end surface view of the stator core 12 (see FIG. 18). Twisted into.

  As a result, the joint portion 171 and the joint portion 176 form a predetermined angle when viewed from the outer peripheral surface, are parallel when viewed from the end surface, form a predetermined angle when viewed from the radial cross-section, and contact each other in a hatched region. . The crossover part 172 and the crossover part 177 are parallel in the end view.

  According to the sixth embodiment, when joining one ends 170 and 175 of the two segments constituting the U-phase winding U, the three junctions 42, 45, and 47 at the neutral point junction N are used. The same effect as in the case of joining, etc. is obtained.

It is a longitudinal cross-sectional view of 1st Embodiment of this invention. It is a cross-sectional view of the stator core of the first embodiment. It is a perspective view of the segment of a 1st embodiment. It is a winding figure of the stator coil | winding of 1st Embodiment. It is a circuit block diagram of 1st Embodiment. (A) of 1st Embodiment is an outer peripheral surface view of a stator core, (b) is the principal part enlarged view of (a). (A) of 1st Embodiment is a principal part end surface view of a stator core, (b) is an enlarged view of (a), (c) is an end surface view of the modification of 1st Embodiment. (A) is radial direction sectional view of the principal part of the stator core of 1st Embodiment, (b) is radial direction sectional view of the modification of 1st Embodiment. It is explanatory drawing of the modification of 1st Embodiment. It is explanatory drawing which shows 2nd Embodiment. It is an end surface view of 3rd Embodiment. It is a perspective view of 3rd Embodiment. It is an end surface view of 4th Embodiment. It is a perspective view of 4th Embodiment. It is explanatory drawing of the modification of 4th Embodiment. It is an end view of 5th Embodiment. It is explanatory drawing of the modification of 5th Embodiment. It is an end surface view of 6th Embodiment. It is a perspective view of 6th Embodiment.

Explanation of symbols

10: Stator 12: Stator core 13a, 13b: End of stator core 14: Slot 17, 27: Coil end 18a, 18b, 28a, 28b: Electrical conductor 21a, 21b, 31a, 31b: End of segment 22a, 22b, 32a, 32b: Transition portion 23a, 23b, 33a, 33b: Joint portion 50: Welded portion U: U phase winding V: V phase winding W: W phase winding Ua: One end of U phase Va: V Phase end Wa: W phase end N: Neutral point junction

Claims (15)

A hollow cylindrical stator core (12) in which a plurality of slots (14) are formed, and a plurality of conductors (17, 27) wound around the slot and having a rectangular cross-sectional shape extend from the end faces of the stator core. Rotating electric machine including a stator (10) having a stator winding (U, V, W) formed by joining protruding ends (21a, 21b, 31a, 31b, Ua, Va, Wa) In
The end portion of each conductor includes a linear joint portion (42, 47) at the tip and a transition portion (43, 48) continuous to the joint portion, and one end of the pair of joint portions is a welded portion ( 50) and the other end of the joined portion is continuous with the crossover portion, and is projected onto a projection plane parallel to the first side surface of the joined portion. An electric rotating machine characterized in that the angle is not 0 degree. A hollow cylindrical stator core (12) having a plurality of slots (14) and a plurality of conductors (17, 27) wound around the slot and having a rectangular cross-sectional shape extend from the end surfaces of the stator core. Rotating electric machine including a stator (10) having a stator winding (U, V, W) formed by joining protruding ends (21a, 21b, 31a, 31b, Ua, Va, Wa) In
The end portion of each conductor includes a linear joint portion (42, 47) at the tip and a transition portion (43, 48) continuous to the joint portion, and one end of the pair of joint portions is a welded portion ( 50) and the other end of the joined portion is continuous with the crossover portion, and is projected onto a projection plane parallel to the second side surface of the joined portion. An electric rotating machine characterized in that the angle is not 0 degree. A hollow cylindrical stator core (12) in which a plurality of slots (14) are formed, and a plurality of conductors (17, 27) wound around the slot and having a rectangular cross-sectional shape extend from the end faces of the stator core. Rotating electric machine including a stator (10) having a stator winding (U, V, W) formed by joining protruding ends (21a, 21b, 31a, 31b, Ua, Va, Wa) In
The end portion of each conductor includes a linear joint portion (42, 47) at the tip and a transition portion (43, 48) continuous to the joint portion, and one end of the pair of joint portions is a welded portion ( 50) and the other end of the joined portion is continuous with the transition portion, and when projected onto a projection plane perpendicular to the extending direction of the joined portion, the angle formed by the paired joined portions is not 0 degree. Rotating electric machine.   4. The rotating electrical machine according to claim 1, wherein each of the conductors includes a plurality of segments.   The rotating electrical machine according to claim 4, wherein both ends of a segment forming the stator winding of a predetermined phase are joined.   The stator winding of a predetermined phase includes a plurality of winding parts connected in series, and one end of a segment at one end of the first winding part and one end of a segment at one end of the second winding part are joined. The rotating electrical machine according to claim 4, wherein:   One end of the segment at one end of the first phase stator winding, one end of the segment at one end of the second phase stator winding, and one end of the third phase winding including the three-phase stator winding The rotating electrical machine according to claim 4, wherein one end of the segment is joined.   The rotating electrical machine according to claim 1, 2, or 3, wherein each of the conductors comprises a continuous line.   9. The stator winding of a predetermined phase includes a plurality of winding portions connected in series, and one end of the first winding portion and one end of the second winding portion are joined. The rotating electrical machine described in 1.   Including the three-phase stator winding, one end of the first phase stator winding, one end of the second phase stator winding, and one end of the third phase winding are joined. The rotating electrical machine according to claim 8.   The rotating electrical machine according to claim 4 or 8, wherein the second side surface of the other joint is joined to the second side surface of the one joint.   The rotating electrical machine according to claim 4 or 8, wherein the first side surface of the other joint is joined to the first side surface of the one joint.   The rotating electrical machine according to claim 4 or 8, wherein a corner portion of the other joint portion is joined to the one joint portion. A hollow cylindrical stator core (12) in which a plurality of slots (14) are formed, and a plurality of conductors (17, 27) wound around the slot and having a rectangular cross-sectional shape extend from the end faces of the stator core. Rotating electric machine having a stator (10) including a stator winding (U, V, W) formed by joining protruding ends (21a, 21b, 31a, 31b, Ua, Va, Wa) In
The end portion of the conductor includes a straight joint portion (42, 47) at the tip and a transition portion (43, 48) continuous to the joint portion, and is on a projection plane perpendicular to the extending direction of the joint portion. The rotating electrical machine characterized in that, when projected, an angle formed by the extending direction of the crossing portion with respect to the first side-side surface of the joint portion of each conductor is not 0 degrees.   The rotating electrical machine according to claim 14, wherein an angle formed by the paired joint portions when projected onto a projection plane perpendicular to the extending direction of the joint portions is not 0 degree.

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