JP2016158452A - Stator for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator for rotary electric machine capable of reducing a surge voltage by reducing inductance between motive force lines of different phases in a motor input part.SOLUTION: A stator 18 for rotary electric machine comprises a stator core 20 and a stator coil 22 formed from coils of multiple phases that are wound around the stator core 20. One-side ends of the coils of the multiple phases are connected with each other and other-side ends are drawn to an axial end of the stator 18. The drawn other-side ends are connected to terminal members 16u, 16v and 16w of the phases via motive force lines 26u, 26v and 26w. The motive force lines 26u, 26v and 26w extend while being in contact with or proximate to each other at least partially in a length direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a stator for a rotating electrical machine, and more particularly to a configuration of a power line that conducts from a coil to a terminal member.

  For example, Patent Document 1 describes a power distribution device that has a problem of reducing a surge voltage by reducing inductance between adjacent bus bars in a power conversion device connected between a battery and a motor. . This power distribution member has a first terminal connected to the power module in the power converter and a second terminal connected to the motor, and connects the first terminal and the second terminal in the same phase. A plurality of conductive members. The conductive member includes a conductor, an insulating layer that covers the conductor, and a semiconductive layer that covers the insulating layer. And the semiconductive layers of the different-phase conductive members are in contact with each other at at least one location of each conductive member.

JP 2012-170184 A

  In the power distribution member described in Patent Document 1, it is possible to reduce the inductance between the conductive members of the respective phases that electrically connect the power converter and the motor to suppress the surge voltage. In some cases, a surge voltage may be superimposed on the motor, and the surge voltage at the motor may increase.

  The objective of this invention is providing the stator for rotary electric machines which can reduce a surge voltage by making the inductance between the different phase power lines in a motor input part small.

  A stator for a rotating electrical machine according to the present invention is a stator for a rotating electrical machine including a stator core and a stator coil formed of a plurality of coils wound around the stator core, and one end portions of the plurality of coils are connected to each other. And the other end portions are drawn out to the axial end portions of the stator, and the other drawn out end portions are connected to the terminal members of the respective phases via power lines, respectively. It extends in contact or close proximity in at least part of its longitudinal direction.

  According to the stator for a rotating electrical machine according to the present invention, the power lines of the respective phases constituting the motor input section are extended in contact with or close to each other in at least a part of the longitudinal direction. Thereby, the inductance between different phase power lines becomes small, and as a result, the surge voltage input to the stator coil can be reduced.

It is a schematic block diagram of the system containing a battery, a power converter device, and a motor. It is a fragmentary perspective view of the stator containing a motor input part. It is the sectional view on the AA line in FIG. (A)-(d) is a top view which shows arrangement | positioning of the different phase power line in a motor input part, (a) shows a comparative example, (b)-(d) shows the example of arrangement | positioning of this embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. In this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating the understanding of the present invention, and can be appropriately changed according to the application, purpose, specification, and the like. In addition, when a plurality of embodiments and modifications are included in the following, it is assumed from the beginning that these characteristic portions are used in appropriate combinations.

  FIG. 1 is a schematic configuration diagram of a system 100 including a battery 10, a power converter 12, and a motor 14. The system 100 is mounted on an electric vehicle such as a hybrid vehicle, an electric vehicle, or a fuel cell vehicle, for example.

  The battery 10 is a power supply device that outputs electric power for driving the motor 14. For example, a secondary battery such as a lithium ion battery or a nickel metal hydride battery is preferably used. The direct current power output from the battery 10 is output to the power conversion device 12 via the power lines 11a and 11b.

  The power conversion device 12 includes an inverter, converts the DC voltage supplied from the battery 10 into an AC voltage, and outputs the AC voltage to the motor 14. In addition to the inverter, power conversion device 12 may include a boost converter that boosts a DC voltage input from battery 10 and outputs the boosted voltage to the inverter.

  The motor 14 is an AC motor that is rotationally driven by AC power input from the power converter 12. For example, a three-phase AC motor is preferably used as the motor 14. The motor 14 is rotationally driven by AC power input from the power converter 12 and outputs traveling power. The motor 14 also functions as a generator. Specifically, power is input from the wheels to the motor 14 at the time of braking of the vehicle, thereby performing regenerative power generation. The AC power generated at this time is converted into DC power by the power converter 12, and is stepped down as necessary to charge the battery 10.

  The motor 14 includes three terminal members 16u, 16v, and 16w that constitute a part of the motor input unit. Three cables 13u, 13v, and 13w extending from the power converter 12 are connected to terminal members 16u, 16v, and 16w that constitute an input unit of the motor 14, respectively. As a result, power can be exchanged between the power converter 12 and the motor 14.

  FIG. 2 is a perspective view showing a part of the stator including the motor input unit. FIG. 3 is a cross-sectional view taken along line AA in FIG.

  As shown in FIG. 2, the motor 14 includes a stator 18 and a rotor (not shown). The stator 18 includes a cylindrical stator core 20 and a stator coil 22 wound around the inner peripheral side of the stator core 20. Since the motor 14 of the present embodiment is a three-phase AC motor, the stator coil 22 includes three phase coils, a U-phase coil, a V-phase coil, and a W-phase coil.

  One end of each phase coil constituting the stator coil 22 is electrically connected to each other at a neutral point. On the other hand, each other end of each phase coil is pulled out to a position near the outer periphery of the axial end of the stator 18 as connection terminals 24u, 24v, 24w. The three connection terminals 24u, 24v, and 24w are arranged at intervals in the circumferential direction of the stator 18.

  In this embodiment, each connection terminal 24u, 24v, 24w is comprised by the edge part of the bus bar connected to the other end part of each phase coil, respectively. However, it is not limited to this, Each connection terminal 24u, 24v, 24w may be comprised by the edge part of the coil conducting wire which comprises each phase coil.

  One end of each of the power lines 26u, 26v, 26w is connected to the connection terminals 24u, 24v, 24w of each phase coil by a technique such as welding. As shown in FIG. 3A, each power line 26u, 26v, 26w includes a core wire 28 made of a metal wire such as a copper wire, and a resin insulating coating 30 covering the periphery of the core wire 28. . In the present embodiment, conductive members having a circular cross section are used as the power lines 26u, 26v, and 26w. In addition, both ends of the power lines 26u, 26v, and 26w are in a state in which the insulating film 30 is removed and the core wire 28 is exposed. Thereby, each one end part of the power lines 26u, 26v, 26w can be electrically connected to the corresponding connection terminals 24u, 24v, 24w by welding or the like.

  Referring to FIG. 2 again, terminal members 16u, 16v, 16w to which cables 13u, 13v, 13w extending from the power converter 12 are connected are attached to the other ends of the power lines 26u, 26v, 26w, respectively. Yes. The terminal members 16u, 16v, 16w are formed of, for example, a metal plate having good conductivity, and are connected to the other end portions of the power lines 26u, 26v, 26w by crimping, caulking, welding, or the like. Further, through holes 34 are formed in the terminal members 16u, 16v, and 16w, respectively. For example, screws are inserted into the through holes to connect the terminal members 16u, 16v, and 16w to connectors (not shown), so that the phase coils of the stator coil 22 are connected to the respective phases via the power lines 26u, 26v, and 26w. Are connected to the cables 13u, 13v, 13w (see FIG. 1). The connectors that connect the cables 13u, 13v, 13w and the power lines 26u, 26v, 26w are fixedly arranged in a housing in which the motor 14 is accommodated. The power lines 26u, 26v, 26w and the terminal members 16u, 16v, 16w constitute a motor input unit.

  In the present embodiment, the power lines 26u, 26v, and 26w connected to the phase connection terminals 24u, 24v, and 24w extend outward from the stator 18 in the radial direction. The power lines 26u, 26v, and 26w extending in this way can be stored in a space formed between the motor 14 including the stator 18 and the inner wall surface of the housing that stores the motor 14.

  As shown in FIGS. 2 and 3A, the power lines 26u, 26v, and 26w are extended in contact with each other in a part of the longitudinal direction (or the extending direction). Specifically, the U-phase power line 26u and the W-phase power line 26w intersect with each other in the X shape and are in contact with each other with the insulating coatings 30. At the intersecting position, the V-phase power line 26v is the U-phase power line 26u. Insulating coatings 30 are in contact with each other. FIG. 3A shows an example in which the W-phase power line 26w, the U-phase power line 26u, and the V-phase power line 26v are arranged in a line from the top, but this order can be changed as appropriate.

  As shown in FIG. 3B, each power line 26u, 26v, 26w is constituted by a rectangular wire with a rectangular cross section, and the long side surfaces of the insulating coating 30 of each power line 26u, 26v, 26w You may arrange | position so that it may contact. As described above, the contact width between the power lines 26u, 26v, and 26w is increased, whereby the inductance between the power lines 26u, 26v, and 26w can be further reduced, which is more effective in reducing the surge voltage.

  Further, as shown in FIG. 3 (a), the power lines 26u, 26v, 26w are not limited to being in contact with each other so that one power line is in contact with the other two power lines. They may be arranged in a stack.

  Further, when the power lines 26u, 26v, and 26w are arranged in contact with each other as shown in FIG. 2, the three power lines 26u, 26v, and 26w may be fixed with an adhesive at the crossing position. Alternatively, it may be bound with a string or an adhesive tape. If it does in this way, the state where each power line 26u, 26v, and 26w contacted can be maintained stably, and it can control effectively that noise arises by vibration of each power line 26u, 26v, and 26w.

  4A to 4D are plan views showing the arrangement of different-phase power lines in the motor input unit, FIG. 4A shows a comparative example, and FIGS. 4B to 4D show arrangement examples of the present embodiment. Show. 4 is different from FIG. 2 in that terminal members 16u, 16v, 16w connected to the ends of the power lines 26u, 26v, 26w of the respective phases are shown in an annular shape.

  The surge voltage (ΔV) generated in the AC voltage applied from the power converter 12 to the motor 14 is ΔV = L · dI / dt using the circuit inductance (L) and the current change rate (dI / dt). Expressed in relationship. That is, as the inductance of the circuit increases, the surge voltage increases. Therefore, the surge voltage can be reduced by reducing the inductance. Further, as described in Patent Document 1, it is known that the inductance of a circuit increases or decreases in proportion to the distance between wiring members included in the circuit.

  According to the present embodiment, the cables 13u, 13v, 13w for connecting the phases of the power converter 12 and the motor 14 are arranged in contact with each other, so that the power converter 12 and the motor 14 are connected to each other. The inductance of the circuit can be reduced, and the surge voltage can be reduced. However, if the distance between the power lines of the phases constituting the motor input unit in the motor 14 is increased, the inductance in the motor input unit may increase and a surge voltage may be superimposed.

  On the other hand, in the stator 18 of the motor 14 in this embodiment, as shown in FIG. 2 and FIG. 4B, the power lines 26u, 26v, 26w of the respective phases are arranged in contact with a part of the longitudinal direction. As a result, the inductance in the motor input unit is reduced, and as a result, the surge voltage in the motor input unit can be reduced. Thereby, the insulation reliability of the stator coil 22 of the motor 14 is improved.

  In addition, since the surge voltage superimposed on the AC voltage applied to the stator coil 22 can be reduced in this way, the insulating coating of the coil conductors constituting the stator coil 22 can be thinned. As a result, the space factor between the slots of the stator 18 is improved, and the loss of the motor 14 and the efficiency can be improved.

  4 (c) and 4 (d) show other arrangement examples of the power lines 26u, 26v and 26w, respectively. In FIG.4 (c), each power line 26u, 26v, 26w is arrange | positioned so that the intermediate part of the longitudinal direction may contact along a linear form. In FIG. 4D, the power lines 26u, 26v, and 26w are arranged in contact with each other along a straight line at the middle portion in the longitudinal direction, but the U-phase terminal member 16u and the W-phase terminal member 16w The position is different from that shown in FIG. 4C. The arrangement similar to that described with reference to FIG. 4B can also be achieved by the arrangement of the power lines 26u, 26v, and 26w shown in FIGS. 4C and 4D.

  In addition, this invention is not limited to the structure of embodiment mentioned above and its modification, A various change is possible in the matter described in the claim of this application, and its equivalent range.

  For example, in the above description, the example in which the power lines 26u, 26v, and 26w are arranged in contact with each other has been described. However, the present invention is not limited to this example, and the power lines 26u, 26v, and 26w are close to each other with a gap between them. May be arranged. In this case, it is preferable to interpose a spacer in order to keep the gaps between the power lines 26u, 26v, 26w constant. As described above, even when the power lines 26u, 26v, and 26w are arranged close to each other, an effect of suppressing a surge voltage due to inductance reduction can be expected by reducing the distance between the power lines 26u, 26v, and 26w.

10 battery, 11a, 11b power line, 12 power converter, 13u, 13v, 13w cable, 14 motor, 16u, 16v, 16w terminal member, 18 stator, 20 stator core, 22 stator coil, 24u, 24v, 24w connection terminal,
26u U phase power line, 26v V phase power line, 26w W phase power line, 28 core wire, 30 insulation coating, 34 through hole, 100 system.

Claims (1)

A stator for a rotating electrical machine comprising a stator core and a stator coil composed of a plurality of coils wound around the stator core,
The multi-phase coils have one end connected to each other and the other end pulled out to the axial end of the stator, and the other pulled-out end is connected to a terminal member of each phase via a power line. Each power line extends in contact with or close to each other in at least a part of its longitudinal direction,
Stator for rotating electrical machines.

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