JP2018121491A - Rotating electric machine stator - Google Patents

Abstract

To provide a stator of a rotating electric machine capable of improving the assembling property of a coil.
A stator 1 is wound around a stator core 11 and a plurality of teeth of the stator core 11, and a stator coil 15 including a plurality of coils 20, 21, 22 and coils 20, 21, 22 are electrically connected to each other, and a neutral wire 30 disposed on one side in the Z direction of the stator core 11 and a coil end 70 positioned on one side in the Z direction in the stator coil 15. The resin portion 60 is provided so as to cover the one side portion 70a and the neutral wire 30 in the Z direction, and integrates the one side portion 70a and the neutral wire 30.
[Selection] Figure 3

Description

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

  Conventionally, as a stator of a rotating electrical machine, there is one described in Patent Document 1. This stator includes a stator core and a stator coil formed by a rectangular wire. The stator core has an annular yoke and a plurality of teeth positioned at intervals in the circumferential direction, and each tooth protrudes radially inward from the yoke. The stator coil includes a U-phase coil, a V-phase coil, and a W-phase coil, and each phase coil includes a plurality of segment coils wound around a tooth.

  One side ends of segment coils adjacent in the circumferential direction in each phase coil are electrically connected by a jumper, and a plurality of segment coils in each phase coil are connected in series. In this stator, the output wire of each phase protruding from one end of each phase coil and the neutral wire connecting the other ends of the coils of different phases are arranged on one outer side in the axial direction of the stator core. Is done.

  Each of the neutral wire and the crossover wire has a circumferentially extending portion that extends along the circumferential direction of the stator core. The circumferentially extending portion of the neutral wire includes a facing portion that is radially opposed to the circumferentially extending portion of the jumper wire through a slight radial gap, and this facing portion extends in the circumferential direction of the jumper wire. It is fixed to the part with a fixing material. Due to the fixing by the fixing material, the neutral wire is prevented from colliding with the connecting wire or the like due to vibration or sliding with respect to the connecting wire, and the damage of the neutral wire is suppressed.

JP 2012-29355 A

  In the stator, in order to be fixed with the fixing material, it is necessary to make the circumferentially extending portion of the neutral wire radially opposed to the circumferentially extending portion of the crossover wire through a slight radial gap. Therefore, it is necessary to strictly manage the coil arrangement, and the assembly of the coil is not easy.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a stator for a rotating electrical machine that can improve the assembly of coils.

  A stator of a rotating electrical machine according to the present invention includes an annular yoke, a stator core including a plurality of teeth protruding radially inward from the yoke in a state of being spaced apart from each other in the circumferential direction of the yoke, and the plurality of teeth. The stator coil including a plurality of phase coils and one end portions of the coils of different phases are electrically connected to each other, and arranged on one side in the axial direction of the stator core. And the neutral coil is disposed so as to cover the one axial portion of the coil end located on one axial side of the stator coil and the neutral wire, A resin portion that integrates the neutral wire.

  According to the stator of the rotating electrical machine according to the present invention, the resin portion is disposed so as to cover the axial one side portion of the coil end and the neutral wire, and integrates the axial one side portion and the neutral wire. . Therefore, even if the arrangement of the neutral wire is not strictly controlled, the neutral wire cannot move relative to the one axial side portion of the coil end, and the neutral wire may collide with other parts or slide. Without being moved, damage to the neutral wire can be suppressed. Therefore, the freedom degree of arrangement | positioning of a neutral wire becomes large, and the assembly | attachment property of a stator coil can be improved.

It is a fragmentary perspective view of the stator of the rotary electric machine which concerns on one Embodiment of this invention. It is a perspective view of the neutral line of the stator. FIG. 2 is a partial schematic view of the AA line cross-sectional view of FIG. 1, and is a partial schematic cross-sectional view in the radial direction of a stator including a resin portion.

  Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. In the following, when a plurality of embodiments and modifications are included, it is assumed from the beginning that a new embodiment is constructed by appropriately combining these characteristic portions. In the following drawings and description of practical examples, the R direction indicates the radial direction of the stator 1, the θ direction indicates the circumferential direction of the stator 1, and the Z direction indicates the height direction (axial direction) of the stator 1. Indicates. The R direction, the θ direction, and the Z direction are orthogonal to each other.

  FIG. 1 is a partial perspective view of a stator 1 of a rotating electrical machine according to an embodiment of the present invention. In FIG. 1, the resin portion is not shown so that the structure and arrangement of the coil, the output line, and the neutral line can be easily understood. As shown in FIG. 1, the stator 1 includes a stator core 11 and a stator coil 15 including a flat wire. The stator core 11 is an annular magnetic part, for example, which is configured by laminating a plurality of silicon steel plates (electromagnetic steel plates), but may also be configured by pressing a resin binder and magnetic material powder. Good. The stator core 11 has an annular yoke 12 disposed on the outer peripheral side and a plurality of teeth 16. The plurality of teeth 16 are disposed at intervals in the θ direction, and each tooth 16 protrudes inward in the R direction from the yoke 12. The stator coil 15 includes U, V, and W three-phase coils 20, 21, and 22 that extend spirally. Each of the three-phase coils 20, 21, and 22 of U, V, and W is inserted into a slot 17 that is a space between adjacent teeth 16 and wound around the teeth 16.

  Each of the three-phase coils 20, 21, and 22 of U, V, and W is configured by connecting a plurality of segment coils 20a, 21a, and 22a in series, and each of the segment coils 20a, 21a, and 22a includes a plurality of abbreviations. A U-shaped segment conductor is welded. When welding, the distal ends of the two leg portions of each segment conductor are bent so that a plurality of segment conductors that overlap in the radial direction form a spiral, and the distal ends of the leg portions of different segment conductors are welded together. Is done. Each segment coil 20a, 21a, 22a is wound around the plurality of teeth 16 so as to straddle the plurality of teeth 16, and the stator coil 15 is distributedly wound around the plurality of teeth 16.

  The protrusions disposed at one ends of the coils 20, 21, 22 of each phase are bent into, for example, a crank shape to form output lines, and the output lines of each phase are electrically connected to a power line (not shown) on the power source side. Connected. In FIG. 1, the U-phase coil 20 is indicated by a diagonal line along the θ direction, the V-phase coil 21 is indicated by a diagonal line along the R direction, and the W-phase coil 22 is indicated by a narrow (fine) diagonal line. Yes. In FIG. 1, an output line 20U of the U-phase coil 20 and an output line 22W of the W-phase coil 22 are illustrated. On the other hand, a protrusion 20b disposed at the other end of the U-phase coil 20, a protrusion 21b disposed at the other end of the V-phase coil 21, and a protrusion 22b disposed at the other end of the W-phase coil 22 are The three-phase coils 20, 21, 22 are Y-connected by electrical connection using the neutral wire 30. The neutral wire 30 is disposed outside the stator core 11 on one side in the Z direction.

  The stator 1 has a plurality of attachment portions 45 arranged at intervals in the θ direction, and each attachment portion 45 bulges outward in the R direction. The stator 1 is attached to the case by passing a bolt (not shown) through the fastening hole 46 of the attachment portion 45 and then fixing the bolt to an axial end surface of the case (not shown).

  On the inner peripheral side of the stator 1, a rotor (not shown) is disposed at a distance from the stator 1. The center of the stator 1 and the rotor substantially coincide. The rotor is an annular magnetic part that is fixed around the rotation shaft, and is configured by, for example, laminating a plurality of annular silicon steel plates (electromagnetic steel plates). For example, a plurality of permanent magnets are embedded in the rotor at intervals in the θ direction.

  For example, when the rotating electrical machine including the stator 1 functions as a motor and a generator, the operation is performed as follows. However, the rotating electrical machine including the stator 1 may function as either the motor or the generator. First, when the rotating electrical machine is used as a motor, for example, after a direct current from a battery is converted into a three-phase alternating current through an inverter, the three-phase alternating current passes through the output lines 20U and 22W of each phase. To the three-phase coils 20, 21, and 22 of U, V, and W. By supplying a three-phase alternating current to the three-phase coils 20, 21, and 22 of U, V, and W, the teeth 16 are magnetized to become magnetic poles, and the magnetic field moves along the θ direction of the stator 1. Occurs. Then, the rotor rotates based on the rotating magnetic field, and rotational power is generated.

  On the other hand, when using a rotating electrical machine as a generator to regenerate electric power, when the rotor is rotated by external power, the permanent magnet embedded in the rotor rotates around the rotor central axis. Then, an induced electromotive force based on the law of electromagnetic induction is induced in the three-phase coils 20, 21, 22 of U, V, and W, and the three-phase coils 20, 21, 22 flows. Then, AC power from the three-phase coils 20, 21, and 22 based on the induced current is converted into DC power by an inverter and then supplied to the battery.

  FIG. 2 is a perspective view of the neutral wire 30. Next, the structure of the neutral wire 30 will be described with reference to FIG. As shown in FIG. 2, the neutral wire 30 includes one transition portion 31 having a generally arcuate shape and three first to third lead portions 41, 42, and 43. Specifically, the crossover portion 31 includes three first to third flat plate portions 31a, 31b, and 31c having a rectangular front side and back side surface. The first flat plate portion 31a is substantially connected to one end portion in the longitudinal direction of the second flat plate portion 31b, and is inclined by α angle to one side in the thickness direction of the second flat plate portion 31b with respect to the second flat plate portion 31b. The third flat plate portion 31c is connected to the other end portion in the longitudinal direction of the second flat plate portion 31b, and is inclined by α angle to one side in the thickness direction of the second flat plate portion 31b with respect to the second flat plate portion 31b. In the example shown in FIG. 2, the neutral wire 30 is a plane that bisects the second flat plate portion 31 b vertically and is substantially plane-symmetric with respect to a plane that includes the thickness direction of the second flat plate portion 31 b. Have.

  Each lead-out portion 41, 42, 43 is joined to one end surface 31d in the width direction of the crossover portion 31 by welding. Specifically, the first lead portion 41 is welded to one side in the longitudinal direction and the one thickness direction of the first flat plate portion 31a, and the third lead portion 43 is one side in the longitudinal direction and the thickness of the third flat plate portion 31c. Welded in one direction. Moreover, the 2nd drawer | drawing-out part 42 is welded to the longitudinal direction center part and thickness direction one side of a 2nd flat plate part. Each of the lead portions 41, 42, 43 has a columnar shape having R-direction outer side end surfaces 41a, 42a, 43a and R-direction inner side end surfaces 41b, 42b, 43b. Projects inward in the R direction from the side. Note that the crossing portion is not limited to the shape shown in FIG. Also, the three drawer portions need only be configured to face inward in the R direction, and need only be arranged at intervals in the θ direction, and are not limited to the shape shown in FIG.

  Referring to FIG. 1 again, the R direction inner side end surface 41b of the first lead portion 41 is joined to the R direction outer side end surface of the protruding portion 21b of the V-phase coil 21 by welding such as TIG welding. The R direction inner side end surface 43b of the three lead portions 43 is joined to the R direction outer side end surface of the protruding portion 22b of the W-phase coil 22 by welding such as TIG welding. Further, the R direction inner side end surface 42b of the second lead portion 42 is joined to the R direction outer side end surface of the protruding portion 20b of the U-phase coil 20 by welding such as TIG welding.

  A cuffer 50 is attached to one end face in the axial direction of the stator core 11. The cuff member 50 includes an outer ring 50a, an inner ring 50b, and a plurality of pillar portions 50c that connect the outer ring 50a and the inner ring 50b. The plurality of column portions 50c are arranged at intervals in the θ direction, and each column portion 50c extends in the R direction so as to overlap the teeth 12 of the stator core 11 when viewed from the Z direction. The cuff member 50 is a resin member, and each column part 50c becomes a starting point of bending when bending the distal end side of the leg part of the segment conductor. In addition, the stator 1 includes a neutral wire holding member 51 attached to an end surface on one side in the Z direction of the outer ring 50a of the cuff 50. The neutral wire holding member 51 has, on the other side in the Z direction (lower side in FIG. 1), first fitting recesses 51a that open on both sides in the θ direction and open on the inner side in the R direction. Have second fitting recesses 51b that open to both sides in the Z direction and open inward in the R direction. The neutral wire holding member 51 is cuffed in the state where the central portion in the θ direction of the transition portion 31 is fitted in the first fitting recess 51a and the second lead-out portion 42 is fitted in the second fitting recess 51b. Attach to. As a result, the neutral wire 30 is fixed to the stator core 11 via the neutral wire holding member 51 and the cuff member 50, and the neutral wire 30 is stably positioned on the outer side on one side of the stator core 11 in the Z direction. The positional deviation of the line 30 is suppressed. In the example shown in FIG. 2, the case where the stator 1 has the cuff 50 and the neutral wire holding member 51 has been described. However, the stator does not have the cuff, and the neutral wire holding member is directly fixed to the stator core. May be. Alternatively, the stator may not have both the cuff and the neutral wire holding member.

  3 is a partial schematic view of the cross-sectional view taken along the line AA of FIG. In FIG. 3, the cuff member 50 is not shown to clearly show the relative position of the resin portion 60 with respect to the stator core 11. As shown in FIG. 3, the neutral wire 30 is disposed on the outer side in the R direction of the coil end 70 on one axial side. The stator 1 includes a resin part 60. The resin portion 60 is disposed so as to cover the one side portion 70a in the Z direction of the coil end 70 located on one side in the Z direction in the stator coil 15 and the neutral wire 30, and the one side portion 70a and the neutral wire. 30 is integrated. In the present embodiment, the neutral wire 30 does not have an insulating film and is made of only a conductive material such as metal. Further, the resin portion 60 is disposed at an interval in the Z direction with respect to the end surface 11 a on one side in the Z direction of the stator core 11.

  As shown in FIG. 3, the coil wires 90, 91, and 92 have a three-layer structure in the Z direction. Specifically, the coil wire 92 located at the innermost side in the Z direction is included in the U-phase coil 20. A portion 92 a located on the inner side in the Z direction in the coil wire 92 represents a portion extending in the substantially Z direction from the slot 17 (see FIG. 1) in the leg portion of the segment conductor included in the U-phase coil 22. Further, a portion 92b located on the outer side in the Z direction in the coil wire 92 represents a portion bent in a direction (θ direction) perpendicular to the paper surface of FIG. Further, the coil wire 91 constituting the intermediate layer in the Z direction is included in the V-phase coil 21. When each phase coil 20, 21, 22 is constructed by welding a plurality of substantially U-shaped segment conductors, the distal ends of the two leg portions of each segment conductor are bent and bent at different segment conductors. The tips of the legs are welded together. Coil wire 91 represents a portion of the segment conductor included in V-phase coil 21 that is on the distal end side of the leg portion that has been subjected to bending processing, and is in the middle of extending toward the welded portion. Further, the coil wire 90 located on the outermost side in the Z direction is included in the W-phase coil 22. Coil wire 90 represents a welded portion between the end portions of the leg portions bent in different segment conductors. As shown in FIG. 1, in this embodiment, three pairs of segment conductors are welded at a position in the θ direction where different segment conductors are welded with respect to each phase coil 20, 21, 22. The welding of the pair of segment conductors is a welding for connecting different segment coils included in the coils 20, 21, and 22 in the same phase in series. Therefore, as shown in FIG. 3, since the different segment coils are not connected in series at the θ-direction position where the protrusion 22b of the W-phase coil 22 is connected to the third lead wire 43, the coil wire 90, that is, different segment conductors There are only two pairs of welds between the tips. Needless to say, for each phase coil, a plurality of pairs of segment conductors other than three pairs may be welded at a position in the θ direction where different segment conductors are welded.

  The structure shown in FIG. 3 is configured by, for example, injection molding. Specifically, a resin molding die (not shown) is arranged at one end of the coil end 70 in the Z direction, and the resin molding die has the structure shown in FIG. 2, that is, the first to third lead portions of the neutral wire 30. 41-43 covers the structure joined to protrusion part 20b, 21b, 22b of each phase coil 20,21,22. Thereafter, when the resin softened by heating is injected into a resin mold and filled and solidified, the resin mold structure shown in FIG. 3 is formed.

  According to the embodiment, the resin portion 60 is disposed so as to cover the one side portion 70a of the coil end 70 in the Z direction and the neutral wire 30, and the one side portion 70a and the neutral wire 30 are integrated. . Therefore, even if the arrangement of the neutral wires 30 is not strictly managed, the neutral wires 30 cannot move relative to the one side portion 70a of the coil end 70, and the neutral wires 30 collide with other parts. The neutral wire 30 can be prevented from being damaged. Therefore, the freedom degree of arrangement | positioning of the neutral wire 30 becomes large, and the assembly | attachment property of the stator coil 15 can be improved.

  Moreover, since the whole neutral wire 30 is covered with the resin part 60, it is not necessary to cover the conductor part of the neutral wire 30 with an insulating film, and the insulation process of the neutral wire 30 can be performed easily. In addition, since the end insulation treatment of the coil end 70 and the fixing of the neutral wire 30 can be performed simultaneously with a resin mold by injection molding, the manufacturing process can be simplified and the cycle time for manufacturing the stator 1 can be shortened.

  Moreover, since the neutral wire 30 is fixed to the one side portion 70a in the Z direction of the coil end 70 by the resin portion 60, the welding area for fixing the neutral wire 30 can be reduced. Moreover, since the insulation film of the neutral wire 30 can be omitted, the distance between the neutral wire 30 and the coil wire of the stator coil 15 can be shortened, and the stator 1 can be configured compactly.

  The present invention is not limited to the above-described embodiment and its modifications, and various improvements and modifications can be made within the matters described in the claims of the present application and their equivalent ranges. For example, in the above-described embodiment, the case where the neutral wire 30 is composed of only a conductive material has been described. However, the neutral wire may have a resin film in a part of the extending direction thereof. . Moreover, although the case where the resin part 60 is arrange | positioned at intervals in the stator core 11 was demonstrated, the structure which a resin part contacts a stator core may be sufficient.

  11 stator core, 12 yoke, 15 stator coil, 16 teeth, 20 U-phase coil, 21 V-phase coil, 22 W-phase coil, 30 neutral wire, 60 resin part, 70 coil end, 70a One side of coil end in Z direction Part, θ direction circumferential direction of stator, R direction radial direction of stator, Z direction axial direction of stator.

Claims (1)

A stator core including an annular yoke and a plurality of teeth projecting radially inward from the yoke in a state spaced from each other in the circumferential direction of the yoke;
A stator coil wound around the plurality of teeth and including a plurality of phase coils;
While electrically connecting the one side ends of the coils of different phases, and a neutral wire disposed on the outer side on one side in the axial direction of the stator core,
The stator coil is disposed so as to cover one axial portion of the coil end located on one axial side of the stator coil and the neutral wire, and the one side portion and the neutral wire are integrated. A resin part
A stator for a rotating electrical machine.

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