JP4914287B2 - Insulator, split stator, and stator for rotating electrical machine - Google Patents

Description

  The present invention relates to a stator of a rotating electric machine (for example, an electric motor) incorporated in a hybrid vehicle, a fuel cell vehicle, or the like.

  Hybrid vehicles and fuel cell vehicles use rotating electrical machines as drive units and regenerative brakes. As a stator incorporated in the rotating electrical machine, a stator core composed of an annular yoke and teeth extending from the yoke to the inner peripheral side, a coil wound around the teeth of the stator core via an insulator, and concentric with the stator core A stator for a rotating electric machine having a ring-shaped bus bar unit arranged is known (Patent Document 1).

The stator for a rotating electrical machine includes a power supply terminal extending from the power supply bus bar incorporated in the bus bar unit to the stator inner peripheral side, and a neutral point extending from the neutral point bus bar incorporated in the bus bar unit to the stator inner peripheral side. A winding start terminal that has a point terminal and is drawn from the coil winding portion to the stator outer peripheral side is connected to the power supply terminal, and a winding end terminal that is drawn from the coil winding portion to the stator outer periphery side is a neutral point terminal It is connected to the.
JP 2006-67740 A

  However, this rotating electrical machine stator bus bar unit is connected to the feeding bus bar and neutral point when the coil terminal drawn from the coil winding portion to the stator outer peripheral side is connected to the feeding terminal and the neutral point terminal. The bus bar is disposed so as to overlap the yoke as viewed in the stator axial direction. For this reason, when this bus bar unit is incorporated in a stator in which the yoke is thicker in the axial direction than the teeth, the axial thickness of the stator becomes large, and the installation space for other parts tends to be insufficient. was there.

  Therefore, in order to solve this problem, the power supply terminal is extended from the power supply bus bar to the outer periphery of the stator, and the neutral point terminal is extended from the neutral point bus bar to the outer periphery of the stator. If the terminal is connected to the end of the coil, the power supply bus bar and the neutral bus bar do not overlap with the yoke when viewed in the stator axial direction, the thickness in the stator axial direction can be suppressed. Since the connection part of the terminal to the coil terminal overlaps with the yoke when viewed in the stator axial direction, the insulation distance between the connection part of each terminal to the coil terminal and the outer periphery of the yoke is shortened to ensure the reliability of insulation. Difficult to do.

  The problem to be solved by the present invention is to reduce the space of a stator for a rotating electrical machine in which the yoke is thicker in the stator axial direction than the teeth, and to ensure the reliability of insulation by the insulator.

  In order to solve the above-mentioned problem, a cylindrical portion incorporated between a tooth extending from the annular yoke of the stator core toward the stator inner peripheral side and a coil wound around the tooth, and a stator outer peripheral side of the cylindrical portion A flange portion formed at the end of the flange, a first extension portion extending from the flange portion toward the outer periphery of the stator, and a second extension extending from the first extension portion toward the core center in the stator axial direction A winding start terminal locking portion in which a winding start terminal pulled out from the coil to the stator outer peripheral side is locked, and a winding end terminal locking in which a winding end terminal pulled out from the coil to the stator outer peripheral side is locked The flange portion overlaps the inner peripheral surface of the yoke, the first extension portion overlaps the axial end surface of the yoke, and the second extension portion surrounds the outer peripheral surface of the yoke. Configuration extending to It was adopted in the insulator.

  Further, in the present invention, as a split stator using the above insulator, an arcuate yoke constituting the annular yoke in an annularly arranged state, and teeth extending from the yoke to the stator inner peripheral side, A split core, the insulator attached to the teeth of the split core, and a coil wound around the teeth of the split core via the cylindrical portion of the insulator, the arcuate yoke is A split stator having a greater stator axial thickness than the teeth is provided.

  In addition, as a stator for a rotating electrical machine using this divided stator, power is supplied to the above-described divided stator arranged in an annular shape, a cylindrical housing that tightens each divided stator from the outer periphery, and a coil of each divided stator. A ring-shaped bus bar unit that has a power supply terminal extending from the power supply bus bar built into the bus bar unit to the outer periphery of the stator, and a neutral point bus bar built into the bus bar unit. A neutral point terminal extending to the side, one of the winding start terminal and the winding end terminal of the coil being connected to the power supply terminal, and the other terminal being connected to the neutral point terminal. A stator for a rotating electric machine is provided.

  In the insulator according to the present invention, the first extending portion that overlaps the axial end surface of the yoke is provided with the winding start terminal locking portion and the winding end terminal locking portion, so that it is locked to the winding start terminal locking portion. The coil winding start terminal and the coil end terminal locked by the coil end terminal locking part are connected to the power supply terminal extending from the power supply bus bar to the stator outer peripheral side, and from the neutral point bus bar to the stator outer peripheral side. The neutral point terminal can be connected to each other. At this time, the power supply bus bar and the neutral point bus bar do not overlap with the yoke when viewed in the stator axial direction, so that the thickness in the stator axial direction can be suppressed. .

  Further, since the second extending portion extending so as to surround the outer peripheral surface of the yoke insulates between the connection portion of the power supply terminal and the neutral point terminal to the coil terminal and the outer periphery of the yoke, the reliability of the insulation Is expensive.

  1 and 2 show a stator for a rotating electrical machine in which an insulator according to an embodiment of the present invention is incorporated. This stator for a rotating electrical machine includes a split stator 1 arranged in an annular shape, a cylindrical housing 2 that fastens the split stator 1 from the outer periphery, and a ring-shaped bus bar unit 3 that supplies power to each split stator.

  As shown in FIGS. 3 and 4, the split stator 1 has a split core 6 composed of an arcuate yoke 4 and a tooth 5 extending from the yoke 4 toward the inner periphery of the stator. A coil 8 is wound through an insulator 7. The split core 6 is made of a green compact of metal magnetic powder, and an arcuate yoke 4 is connected to form an annular yoke 9 with the split stator 1 arranged in an annular shape as shown in FIG. Further, the yoke 4 is thicker in the stator axial direction than the teeth 5, thereby ensuring a cross-sectional area of a magnetic path formed by the yoke 9.

  As shown in FIG. 4, the insulator 7 includes a cylindrical portion 10 incorporated between the tooth 5 and the coil 8, flange portions 11 and 12 formed at one end and the other end of the cylindrical portion 10, A first extending portion 13 that extends from the flange portion 12 on the outer periphery of the stator that overlaps the peripheral surface to the outer peripheral side of the stator and overlaps the axial end surface of the yoke 9, and extends from the first extending portion toward the core in the stator axial direction. A second extending portion extending to surround the outer peripheral surface of the yoke. The cylinder part 10, the flange parts 11 and 12, the first extension part 13, and the second extension part 14 are all made of an insulating material.

  As shown in FIG. 3, the first extending portion 13 is formed with a winding start terminal guide piece 15 and a winding start terminal locking piece 16 that are adjacent to each other in the stator circumferential direction, and at the end of winding that is adjacent to the stator circumferential direction. The terminal guide piece 17 and the winding end terminal locking piece 18 are formed, and the winding start terminal locking piece 16 and the winding end terminal locking piece 18 are respectively formed with slits 19 and 20 having one end opened.

  The coil 8 has a winding start terminal 8 </ b> A and a winding end terminal 8 </ b> B drawn out from the winding portion 8 </ b> C wound around the tooth 5 to the stator outer peripheral side. The winding start terminal 8A is locked to the slit 19 of the winding start terminal locking piece 16 while being hooked on the winding start terminal guide piece 15, and the winding end terminal 8B is also hooked to the winding end terminal guide piece 17 The end of the winding is locked in the slit 20 of the terminal locking piece 18.

  As shown in FIG. 5, the bus bar unit 3 includes ring-shaped power supply bus bars 21U, 21V, and 21W arranged concentrically in order from the outer peripheral side toward the inner peripheral side, and the power supply bus bars 21U, 21V, and 21W. A neutral point bus bar 21N arranged on the outer peripheral side, power supply bus bars 21U, 21V, 21W and a holder 22 for holding the neutral point bus bar 21N are provided. The power supply bus bars 21U, 21V, and 21W are respectively provided with primary-side terminals 23U, 23V, and 23W that are connected to a three-phase AC U, V, and W-phase power source.

  The bus bar unit 3 includes a power supply terminal 24B extending from the power supply bus bar 21U to the stator outer peripheral side, a power supply terminal 24B extending from the power supply bus bar 21V to the stator outer peripheral side, and a power supply bus bar 21W to the stator outer peripheral side. And a neutral point terminal 24A extending from the neutral point bus bar 21N to the stator outer peripheral side is provided between the adjacent power supply terminals 24B and 24B. Yes.

  As shown in FIG. 6, the neutral point terminal 24A includes an extending portion 25A extending from the neutral point bus bar 21N to the outer periphery of the stator and a connecting portion 26A connected to the extending portion 25A. As shown in FIG. 3, the connecting portion 26 </ b> A is connected to the winding start terminal 8 </ b> A of the coil locked in the slit 19 by caulking in a U shape that opens in the stator axial direction when viewed in the stator circumferential direction.

  Similarly to the neutral point terminal 24A, the power supply terminal 24B includes an extension portion 25B extending from the power supply bus bars 21U, 21V, and 21W to the stator outer peripheral side, and a connection portion 26B connected to the extension portion 25B. The connecting portion 26B is connected to the winding end terminal 8B of the coil locked in the slit 20 by caulking in a U shape that opens in the stator axial direction when viewed in the stator circumferential direction. Moreover, the connection part 26B of each electric power feeding terminal 24B is arrange | positioned on the same periphery as the connection part 26A of the neutral point terminal 24A, as shown in FIG.

  This stator for a rotating electrical machine can be assembled, for example, as follows. First, the coil 8 is wound around the split core 6 via the insulator 7, the winding start terminal 8A of the coil 8 is started to be locked to the slit 19 of the terminal locking piece 16, and the coil winding end terminal 8B is ended. The terminal locking piece 18 is locked in the slit 20. The divided stator 1 thus formed is arranged in an annular shape, and the housing 2 is shrink-fitted on the outer periphery thereof. Subsequently, the bus bar unit 3 is disposed concentrically with the split stator 1, and the connecting portion 26A of the neutral point terminal 24A is caulked to join the coil winding start terminal 8A, and the connecting portion 26B of the feeding terminal 24B is caulked. Is joined to the winding end terminal 8B.

  When this insulator 7 is used, as shown in FIG. 7, the coil is locked by the winding start terminal 8 </ b> A of the coil locked in the slit 19 of the winding start terminal locking piece 16 and the slit 20 of the winding end terminal locking piece 18. The coil winding end terminal 8B has a neutral point terminal 24A extending from the neutral point bus bar 21N to the stator outer peripheral side, and a power supply terminal 24B extending from the power supply bus bars 21U, 21V, 21W to the stator outer peripheral side. Can be connected respectively. At this time, the power supply bus bars 21U, 21V, and 21W and the neutral point bus bar 21N do not overlap with the yoke 4 when viewed in the stator axial direction, so that the thickness in the stator axial direction is difficult to increase, and the installation space of the stator can be suppressed. it can.

  Further, the second extending portion 14 extending so as to surround the outer peripheral surface of the yoke 4 insulates the connecting portion 26A of the neutral point terminal 24A from the outer periphery of the yoke 9, and also connects the feeding terminal 24B. Since the insulation between 26B and the outer periphery of the yoke 9 is insulated, the insulation reliability is high.

  In the above embodiment, the insulator 7 is mounted on the tooth 5 of the split core 6 in which the thickness of the yoke 4 is larger than that of the tooth 5. The insulator 7 is a stator core formed of a laminated body of annular electromagnetic steel plates. It may be attached to the teeth.

  In the above embodiment, the coil winding start terminal 8A is connected to the neutral point terminal 24A and the coil winding end terminal 8B is connected to the power supply terminal 24B. However, the coil winding start terminal 8A is connected to the power supply terminal 24B. The coil winding end terminal 8B may be connected to the neutral point terminal 24A.

  In the figure, two coils are wound in parallel to increase the space factor of the coils, but one coil may be wound.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

The top view which shows the stator for rotary electric machines incorporating the insulator of embodiment of this invention 1 is a cross-sectional view perpendicular to the axis of the stator for a rotating electrical machine in FIG. 1 is an exploded perspective view of the stator for a rotating electrical machine in FIG. The perspective view of the state which cut | disconnected the division | segmentation stator of FIG. 3 along the plane containing a stator axis | shaft Plan view of the bus bar unit of FIG. An enlarged perspective view of the bus bar unit of FIG. Sectional drawing along the plane containing the stator axis | shaft of the stator for rotary electric machines of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Split stator 2 Housing 3 Bus bar unit 4 Yoke 5 Teeth 6 Split core 7 Insulator 8 Coil 8A Winding start terminal 8B Winding end terminal 9 York 10 Tube part 12 Flange part 13 1st extension part 14 2nd extension part 16 Start of winding Terminal locking piece 18 End of winding terminal locking piece 21U, 21V, 21W Power supply bus bar 21N Neutral point bus bar 24A Neutral point terminal 24B Power supply terminal

Claims (3)

  A cylindrical portion (10) incorporated between a tooth (5) extending from the annular yoke (9) of the stator core to the stator inner peripheral side and a coil (8) wound around the tooth (5); A flange portion (12) formed at an end of the cylindrical portion (10) on the stator outer peripheral side, a first extension portion (13) extending from the flange portion (12) to the stator outer peripheral side, and a first extension thereof A second extending portion (14) extending from the protruding portion (13) toward the center of the core in the stator axial direction, and a winding start terminal locking portion (16) provided on the first extending portion (13). , An insulator (7) having a winding end terminal locking portion (18) provided in the first extension portion (13), wherein the flange portion (12) is an inner peripheral surface of the yoke (9). The first extending portion (13) overlaps the axial end surface of the yoke (9). The second extension part (14) extends so as to surround the outer peripheral surface of the yoke (9), the winding start terminal locking part (16) locks the winding start terminal (8A) of the coil, The winding end terminal locking portion (18) is an insulator for locking the winding end terminal (8B) of the coil.   A split core comprising an arcuate yoke (4) constituting the annular yoke (9) and teeth (5) extending from the yoke (4) toward the inner periphery of the stator in an annularly arranged state ( 6) and the insulator (7) according to claim 1 attached to the teeth (5) of the split core (6), and the split core via the tubular portion (10) of the insulator (7). A split stator (1) comprising a coil (8) wound around a tooth (5) of (6), wherein the arc-shaped yoke (4) is closer to the stator axial direction than the tooth (5). Split stator with large thickness.   The split stator (1) according to claim 2, which is arranged in an annular shape, a cylindrical housing (2) for tightening each split stator (1) from the outer periphery, and a coil (8) of each split stator (1) A stator for a rotating electrical machine having an annular bus bar unit (3) for supplying electric power, wherein the bus bar unit (3) is fed from a power supply bus bar (21U, 21V, 21W) incorporated in the bus bar unit (3). A power supply terminal (24B) extending to the outer peripheral side of the stator, and a neutral point terminal (24A) extending to the outer peripheral side of the stator from the neutral point bus bar (21N) incorporated in the bus bar unit (3), One terminal of the coil winding start terminal (8A) and winding end terminal (8B) is connected to the power supply terminal (24B), and the other terminal is connected to the neutral point terminal (24A). Stator for rotary electric machine that has been.

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