JP6165454B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine.

  In order to connect the lead coil and the terminal from the stator, a method of melting and connecting the coil is known (for example, see Patent Document 1).

  In the method in which the coil is directly wound around without being connected by welding, the lead coil to be wound around becomes long and interference occurs in the subsequent process. Thus, the method of attaching by welding in the final process is employed.

JP 2011-259654 A

  During operation of the rotating electrical machine, stress may be generated in the lead coil and the welded portion of the coil due to vibration, cold heat, etc., and deformation or breakage may occur.

  Therefore, the present invention provides a connection terminal capable of reducing stress generated in a welded part and a rotating electrical machine including the connection terminal.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-described problems. For example, in the rotating electrical machine having a resin member that holds a scooping coil from a stator coil, the resin member is the scooping coil. And a fixing member that holds the lead wire connected through the welded portion.

  ADVANTAGE OF THE INVENTION According to this invention, the rotary electric machine which can reduce the stress which generate | occur | produces in a welding part can be provided.

  Problems, configurations, and effects other than those described above will become apparent from the description of the following examples.

It is a schematic diagram which shows the whole structure of a rotary electric machine. (Example 1) which is a perspective view which shows the stator of a rotary electric machine. (Example 2) which is a perspective view which shows the stator of a rotary electric machine.

Embodiments will be described below with reference to the drawings.
In the following description, “axial direction” refers to a direction along the rotation axis of the rotating electrical machine. The circumferential direction refers to the direction along the rotational direction of the rotating electrical machine. The “radial direction” refers to a radial direction (radial direction) when the rotational axis of the rotating electrical machine is the center. “Inner circumference side” refers to the radially inner side (inner diameter side), and “outer circumference side” refers to the opposite direction, that is, the radially outer side (outer diameter side).
[Example 1]
The rotating electrical machine according to the present embodiment is a rotating electrical machine that is suitable for use in driving an automobile. Here, a so-called electric vehicle using a rotating electric machine includes a hybrid type electric vehicle (HEV) having both an engine and a rotating electric machine, and a pure electric vehicle (EV) that runs only by the rotating electric machine without using an engine. However, since the rotating electrical machine described below can be used for both types, the description will be made based on the rotating electrical machine used for a hybrid type vehicle as a representative.

  FIG. 1 is a schematic diagram illustrating an overall configuration of a rotating electrical machine 100 according to an embodiment of the present invention. In FIG. 1, the inside of the rotating electrical machine 100 is shown by making a part of the rotating electrical machine 100 into a cross section.

  As shown in FIG. 1, the rotating electrical machine 100 is disposed inside the case 10, and includes a housing 112, a stator 130 having a stator core 132 fixed to the housing 112, and the inside of the stator. And a rotor 150 disposed rotatably. The case 10 includes an engine case and a transmission case.

  The rotating electrical machine 100 is a three-phase synchronous motor with a built-in permanent magnet. The rotating electrical machine 100 operates as an electric motor that rotates the rotor 150 when a three-phase alternating current is supplied to the stator coil 138 wound around the stator core 132. Further, when the rotating electrical machine 100 is driven by an engine, it operates as a generator and outputs three-phase AC generated power. That is, the rotating electrical machine 100 has both a function as an electric motor that generates rotational torque based on electric energy and a function as a generator that generates electric power based on mechanical energy. Functions can be used selectively.

  The stator 130 fixed to the housing 112 is fixedly held in the case 10 by fastening a flange 115 provided on the housing 112 to the case 10 with a bolt 12.

  The rotor 150 is fixed to the shaft 118 supported by the bearings 14 </ b> A and 14 </ b> B of the case 10, and is rotatably held inside the stator core 132.

  As shown in FIG. 1, the stator coil 138 has a total of three systems (U, V, W) of coils mounted in close contact with the stator core 132. The three coils constituting the stator coil 138 are arranged at appropriate intervals by the slot 420.

  At one coil end of the stator coil 138, there are AC terminals 41, 42, 43, which are input / output conductors of the U, V, and W three-phase stator coils 138, and a neutral point connection conductor (see FIG. (Not shown). In order to improve workability in the assembly of the rotating electrical machine 100, the AC terminals 41, 42, 43 for receiving the three-phase AC power are arranged so as to protrude outward in the axial direction of the stator core 132 from the coil end. Has been. The stator 130 is connected to a power converter (not shown) through the AC terminals 41, 42, and 43, so that AC power is supplied.

  When a rotating magnetic field is generated in the stator 130 by supplying the three-phase alternating current to the stator coil 138, the rotating magnetic field acts on the permanent magnet 154 of the rotor 150 to generate magnet torque. That is, since the reluctance torque described above is generated on the rotor 150 in addition to this magnet torque, both the above-described magnet torque and reluctance torque act on the rotor 150 as the rotational torque, resulting in a large rotation. Torque can be obtained.

  Next, the reinforcement part which is the characteristic of this invention is demonstrated with reference to FIG. 2, FIG. FIG. 2 is a perspective view of a part of the stator 130 of the rotating electrical machine 100 according to the first embodiment of the present invention.

  AC terminals 41, 42, and 43, which are input / output conductors of the U, V, and W three-phase stator coils 138, and a neutral point connection conductor (not shown) are drawn out. A resin member 500 is provided on the upper part in the axial direction of the coil end. The resin member 500 is molded with a wiring 521 that is electrically connected to the stator coil 138. A fixing member 510 that holds the lead wire 560 is provided on the radially outer side of the resin member 500.

  A copper plate 540 is resin-molded inside the fixing member 510. The copper plate 540 includes a first copper plate protruding portion 540A that protrudes in the axial direction on the radially inner side of the fixing member 510, and a second copper plate protruding portion 540B that protrudes in the axial direction on the radially outer side of the fixing member 510. ing. The fixing member 510 has a first through hole for passing the wiring 521 near the copper plate protruding portion 540A, and a second through hole for passing the lead wire 560 in the axial direction near the copper plate protruding portion 540B. .

  One end of the wiring 521 is pulled out through the first through hole, and one end of the lead wire 560 is pulled out through the second through hole. Then, one end of the wiring 521 and the tip of the first copper plate protruding portion 540A are welded to form a welded portion 520A. Further, one end of the lead wire 560 and the tip of the second copper plate protrusion 540B are welded to form a welded portion 520B.

  The lead wire 560 may be not only a round wire but also a flat wire.

  By connecting the wiring 521 (that is, the winding coil from the stator) to the lead wire 560 through the copper plate 540 molded on the fixing member 510, the wiring 521, the lead wire 560, and the fixing member 510 can be held. It is possible to reduce the stress generated in the welded portions 520A and 520B due to vibration and cold heat.

The copper plate 540 can be omitted. In this case, the lead wire 560 and the winding coil from the stator are held by the fixing member 510, and the lead wire 560 and the winding coil from the stator may be directly connected.
[Example 2]
Another embodiment of the present invention will be described. Parts not specifically described are the same as those in the first embodiment.

  In the present embodiment, the copper plate 540 is pulled out from the radially outer end of the fixing member 510 described in the first embodiment to form a second copper plate protrusion 540B. The second copper plate protrusion 540B drawn in the radial direction bends in the axial direction in the middle, and after crimping the lead wire 560 with the ring 530 at the portion bent in the axial direction, The tip of the second copper plate protrusion 540B is welded to form a weld 520B.

  The second copper plate protrusion 540B is bent in the axial direction in order to provide a welding portion 520B with the lead wire 560 in the axial direction to facilitate the welding operation.

  By connecting via the ring 530, the stress which generate | occur | produces in a welding part by a vibration or cold heat can be reduced.

  In this embodiment, the ring 530 is a copper plate having a thickness of about 0.5 to 1.5 mm, but may be a clad material with a brazing material attached thereto.

  Further, the copper plate 540 can be omitted as in the first embodiment, and the scooping coil from the stator may be directly connected to the lead wire 560 through the ring 530.

  Lead wires 560 are arranged in parallel with the axial direction of the stator so as to facilitate welding. When welding, the electrodes are easy to arrange and workability is improved.

  Welding is fusion bonding, mainly TIG welding or laser welding.

  In each of the embodiments described above, the heights of the welded portions 520A and 520B are approximately the same height for each of the welded portions 520A and the welded portions 520B, so that welding can be performed with the same welding apparatus. it can. In each embodiment, the fixing member 510 is arranged so that the lead wire 560 protrudes in the axial direction of the stator 130. Thus, by arranging the wiring 521 and the lead wires so that the welded portions 520A and 520B face the axial direction, it is easy to arrange the electrodes when welding, and workability can be improved.

  Note that the wiring 521 and the lead wire 560 may be protruded in the circumferential direction and the radial direction, that is, the welded portions 520A and 520B may be directed in the circumferential direction and the radial direction. When using the copper plate 540 in this configuration, the protruding direction and the bending direction of the first copper plate protruding portion 540A and the second copper plate protruding portion 540B are set in the circumferential direction and the radial direction in accordance with the protruding direction of the wiring 521 and the lead wire 560. change.

  In each embodiment, the fixing member 510 and the resin member 500 are integrally formed. However, the fixing member 510 and the resin member 500 may be formed separately and connected via a fitting portion or the like. Moreover, in each Example, although the fixing member 510 is comprised with the same insulating material as the resin member 500, you may comprise with a different insulating material. Furthermore, the copper plate 540 should just be an electroconductive member, and is not restricted to a copper plate-shaped member.

  When the stator 130 is rotated, the lead wire 560 may interfere with a jig or the like, and the lead wire 560 may be bent. For this reason, workability | operativity can be improved by connecting the lead wire 560 and the copper plate 540 in a downstream process. In addition, by configuring the lead wire 560 with a conductor having a bent structure composed of a plurality of straight portions and bent portions, the lead wire 560 can be changed into various shapes depending on the application, and can be applied to various models. It becomes.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 10 Case 14A Bearing 14B Bearing 41 AC terminal 42 AC terminal 43 AC terminal 100 Rotating electrical machine 112 Housing 115 Flange 130 Stator 132 Stator core 138 Stator coil 150 Rotor 152 Rotor core 200 Core welding part 500 Resin member 510 Fixed member 520A welded portion 520B welded portion 530 ring 540 copper plate 540A first copper plate protruding portion 540B second copper plate protruding portion 560 lead wire

Claims (2)

In the rotating electrical machine having a resin member that holds the scooping coil from the stator coil,
The resin member includes a fixing member that holds a lead wire connected to the scooping coil and a welded portion,
The lead wire is composed of a conductor having a bent structure composed of a plurality of straight portions and bent portions,
The fixing member includes a copper plate that protrudes from the fixing member at two locations, a first copper plate protrusion and a second copper plate protrusion,
The second copper plate protrusion has a portion bent in the axial direction of the rotating electrical machine,
One end of the scooping coil is welded to the tip of the first copper plate protrusion,
One end of the lead wire is welded to a portion bent in the axial direction of the second copper plate protrusion through a ring that crimps one end of the lead wire,
One end of the lead wire and the welded portion of the second copper plate protrusion are directed in the axial direction of the rotating electrical machine ,
A rotating electrical machine in which one end of the scooping coil and the welded portion of the first copper plate protrusion are oriented in the same direction as one end of the lead wire and the welded portion of the second copper plate protrusion . In the rotating electrical machine according to claim 1,
A rotating electrical machine having a ring for caulking the scooping coil and the lead wire.