JP2014217105A - Stator for rotary electric machine, and rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost stator for rotary electric machines that can maintain connection quality at a neutral point.SOLUTION: In a stator 1 of a rotary electric machine provided with a stator iron core 2 and rounds of winding 4 each having a plurality of phases and wound around the stator iron core 2 via an insulator 3, each round of winding 4 has neutral point side transition wires 9a to 9c on the connection side of the neutral point 8; any of the neutral point side transition wires 9a to 9c gives rise to no stress relaxation at normal temperature and is formed of an electro-conductive member; the neutral point side transition wires 9a to 9c of different phases are connected at the neutral point 8; and each round of winding 4 is formed of aluminum material elsewhere than the parts of the neutral point side transition wires 9a to 9c.

Description

  The present invention relates to a stator for a rotating electrical machine and a rotating electrical machine that can maintain connection quality at a low cost and at a neutral point.

  A conventional stator of a rotating electrical machine includes a stator core having a plurality of magnetic pole teeth along an inner peripheral portion, and windings that are directly wound around each magnetic pole tooth of the stator core via an insulator as an insulating member Is used for the purpose of connecting a neutral point (for example, see Patent Document 1).

JP 2012-152023 A

Conventional rotating electrical machine stators and rotating electrical machines use terminals that use mechanical pressure for connection, and therefore cannot be applied to aluminum wire connections where stress relaxation occurs at room temperature. There was a problem that it was necessary to construct a line.
Examples of connection methods applicable to aluminum wires include soldering, fusing, and cold welding. However, compared with the connection by the terminal, these connection methods have a problem that quality control of the connection portion is difficult, and in particular, a defect is likely to occur at a neutral point where three wires need to be connected.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a stator for a rotating electrical machine and a rotating electrical machine that can maintain connection quality at a neutral point at a low cost. And

The stator of the rotating electrical machine of the present invention is
A stator core,
In a stator of a rotating electric machine comprising a plurality of windings wound around an insulating member around the stator core,
Each of the windings has a neutral-point crossover on the neutral-point connection side,
Each of the neutral point side crossovers does not generate stress relaxation at room temperature, and is formed of a conductive member,
The neutral point side connecting wire of each phase is connected at the neutral point,
At least one of the windings is formed of an aluminum material at a location other than the neutral crossover wire.

The rotating electrical machine of the present invention is
A stator of the rotating electric machine and a rotor that generates torque by being combined with the stator are provided.

Since the stator of the rotating electrical machine and the rotating electrical machine of the present invention are configured as described above,
Connection quality at a neutral point can be maintained at a low cost.

It is a figure which shows the structure of the stator of the rotary electric machine of Embodiment 1 of this invention. It is a perspective view which shows the structure of the insulator of the stator of the rotary electric machine shown in FIG. It is a front view which shows the structure of the stator of the rotary electric machine shown in FIG. It is a figure which shows the structure of the stator of the rotary electric machine of Embodiment 2 of this invention.

Embodiment 1 FIG.
Embodiments of the present invention will be described below. 1 is a plan view showing a configuration of a stator of a rotating electric machine according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing a configuration of an insulator of the stator of the rotating electric machine shown in FIG. 1, and FIG. It is a front view which shows the structure of the stator of the rotary electric machine shown in FIG. In the figure, an annular stator 1 of a rotating electric machine is composed of a stator core 2 having nine magnetic pole teeth 14 projecting at equal intervals in the center direction, and an insulating member on each magnetic pole tooth 14 of the stator core 2. Each of the windings 4 is composed of u-phase, v-phase, and w-phase windings 4 that are directly wound through a certain insulator 3.

  Each winding 4 has a neutral point side connecting wire 9a, 9b, 9c on the connection side of the neutral point 8, respectively, and each neutral point side connecting wire 9a, 9b, 9c generates stress relaxation at room temperature. In addition, it is made of a conductive member, here a copper material. And the places other than each neutral point side connecting wire 9a, 9b, 9c of each coil | winding 4 are formed with the aluminum material. Each neutral-point crossover wire 9a, 9b, 9c is covered with a sleeve 10a, 10b, 10c for insulation. However, this sleeve can be removed when there is no risk of contact with the winding 4 of the different phase (for example, in the case of FIG. 1, the sleeve 10c can be omitted). The neutral point 8 is configured by connecting the neutral point side connecting wires 9a, 9b, and 9c with the crimp terminals 11 and connecting them. In addition, since the winding terminals 6f, 6g, 6h of the windings u3, v3, w3 and the neutral-point connecting wires 9a, 9b, 9c are formed of an aluminum material and a copper material, respectively. They are connected via cold pressure contact portions 7b, 7c and 7d, respectively.

  The stator core 2 is a split-type stator core composed of split cores 15 that are split for each magnetic pole tooth 14. Each divided iron core 15 is formed by laminating a plurality of magnetic plates and the like, and includes a yoke portion 16 extending in the circumferential direction and magnetic pole teeth 14 projecting in the center direction from the central portion of the yoke portion 16. . The stator core 2 is configured by arranging nine such split cores 15 in an annular shape and connecting the yoke portions 16 of the adjacent split cores 15 so as to be rotatable by a connecting portion 17. Here, for convenience, the number of magnetic pole teeth 14 is shown as an example of nine, but other numbers may be used. Moreover, although the stator core 2 shows the example formed in the connection part 17 so that rotation is possible, the structure of a stator core may not be formed so that rotation is possible, for example, the yoke part 16 is provided. An undivided stator core, a stator core in which the yoke portion 16 is divided and does not have the connecting portion 17, or a stator core in which the connecting portion 17 is not rotatable but connected in a thin wall, etc. The present invention can be applied to stator cores having various structures.

  The insulator 3 is configured as a pair, and is formed by plastic resin molding, for example. And the insulator 3 is each mounted | worn so that the magnetic pole tooth 14 may be covered from the up-and-down both sides of the lamination direction of the magnetic pole tooth 14 of the stator core 2. As shown in FIG. In FIG. 2, the insulator 3 on one side (upper side) of the pair of insulators 3 will be described. The insulator 3 has a winding part 18 that covers the axial end surface of the stator 1 of the magnetic pole teeth 14 and a part of the side surface, and the winding 4 is wound on the winding part 18.

  Further, at both ends of the winding portion 18, winding walls for preventing the winding 4 wound around the magnetic pole teeth 14 from being collapsed are provided, and the root side (radially outer side) of the magnetic pole teeth 14 is provided. The winding wall located at the first winding wall portion 19 is referred to as the first winding wall portion 19, and the winding wall located at the tip side (radially inside) of the magnetic pole teeth 14 is referred to as the second winding wall portion 20. On the back surface (radial outer side surface) of the first winding wall portion 19, at least the winding 4 for storing the connecting wire 21 that connects the winding portions 18 and the windings 4 wound around the magnetic pole teeth 14. Three rear grooves 12a, 12b, 12c that are wider than each other and do not cross each other are provided. Here, the first-stage rear groove 12a, the second-stage rear groove 12b, and the third-stage rear groove 12c from the upper side are used. The configuration of the lower insulator 3 (part that is paired with the upper insulator 3) omitted in FIG. 2 is basically the same as that of the upper insulator 3. However, since the connecting wire 21 is not disposed on the lower side, it is not necessary to provide a back surface groove.

  The winding 4 is wound around each magnetic pole tooth 14 via the insulator 3. Here, the winding 4 starts to be wound from the outside in the radial direction of each magnetic pole tooth 14 and is wound in order of the first layer, the second layer,. It is wound to end with. For this reason, the winding terminals of the winding start and the winding end of the winding 4 protrude from the radially outer side of each magnetic pole tooth 14. The winding 4 is composed of three three-phase phases, a total of nine u-phase windings u1, u2, u3, v-phase windings v1, v2, v3, and w-phase windings w1, w2. , W3 are repeatedly arranged in the rotation direction in the order of u phase, v phase, and w phase. And each winding u1-w3 is comprised with the aluminum wire.

  In the stator 1, the crossover wire 21 exists between the winding u <b> 1 and the winding u <b> 2. The connecting wire 21 is formed by connecting the winding terminal 6a of the winding u1 and the winding terminal 6b of the winding u2 by cold welding. Crossover wires are configured between the other windings in the same configuration as the windings u1 and u2. These crossover wires 21 are accommodated in the rear grooves 12 a to 12 c of the insulator 3.

  Here, a method for housing the crossover wire 21 in the rear grooves 12a to 12c of the insulator 3 will be described with reference to FIG. The crossover wire 21 is arranged in a stepped manner in the rear grooves 12a to 12c. Specifically, for example, in the case of the connecting wire 21 between the winding u1 and the winding u2, the back groove 12a of the insulator 3 around which the winding v1 is wound, and the insulator 3 around which the winding w1 is wound. The rear groove 12b and the winding u2 are sequentially housed in the rear groove 12c of the insulator 3 around which the winding u2 is wound. Thus, by accommodating in the back surface grooves 12a-12c, the crossover wires 21 do not contact each other, and the insulation between each phase is securable. In addition, the winding terminals 6c, 6d, 6e of each phase u1, v1, w1 are connected to an external power source.

  The rotating electrical machine includes the above-described stator of the rotating electrical machine and a rotor that generates torque when combined with the stator. Since this is the same in the following embodiments, the description thereof will be omitted as appropriate.

  The stator and the rotating electric machine of the rotating electric machine according to the first embodiment configured as described above are formed of an aluminum material that can be formed at a low cost at a winding portion that requires a large amount of material. A material having excellent connection quality, that is, a member that does not cause stress relaxation at room temperature and has conductivity, is used for the neutral point-side jumper at the winding point on the property point side. For this reason, it is possible to achieve both cost reduction and improvement in connection quality.

  In addition, it is possible to divert the existing connection method at the neutral point while configuring the neutral point crossover wire with copper material and obtaining the effect of cost reduction by using an inexpensive aluminum material for the winding. It becomes possible, and the connection quality at the neutral point can be further improved.

  In the first embodiment, an example is shown in which all the portions other than the neutral crossover wires of each winding are made of aluminum. However, the present invention is not limited to this, and at least one of the windings is not limited thereto. On the other hand, if the portion other than the neutral crossover wire is made of an aluminum material, the cost can be reduced and the connection quality can be improved.

  In addition, the stator uses cold pressure welding as a connection method between windings and a crimp terminal as a connection method at a neutral point, but the present invention is not limited to these connection methods and is connected. If at least one of the wires is an aluminum wire, fusing, solder, cold welding or the like can be applied. Further, if all of the wires to be connected are copper wires, in addition to fusing, solder, and cold welding, connection by a connection terminal using stress such as a crimp terminal is possible.

Embodiment 2. FIG.
FIG. 4 is a plan view showing the configuration of the stator of the rotating electrical machine according to the second embodiment of the present invention. In the first embodiment, an example in which the connection at the neutral point 8 is configured using the neutral point-side connecting wires 9a, 9b, and 9c, the sleeves 10a, 10b, and 10c, and the crimp terminal 11 is shown. However, the present invention is not limited to this, and as shown in FIG. 4, these parts are separated into three parts from one part, the neutral point 8, to the neutral point side connecting lines 9 a, 9 b, 9 c of each phase. Alternatively, the neutral point terminal 13 may be used. At this time, the material of the neutral point terminal 13 may be any member as long as it does not cause stress relaxation at room temperature and has conductivity. For example, it is made of a steel material used for sheet metal parts.

  According to the stator of the rotating electrical machine of the second embodiment configured as described above, the same effects as those of the first embodiment can be obtained, and the number of parts can be reduced and the number of assembly steps can be reduced. Both direct material costs and processing costs can be reduced. Further, if this neutral point terminal member is made of copper, cold welding that does not require additional members can be applied to the connection between the winding terminal and the neutral point terminal. Material costs can be reduced.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

1 Stator, 2 Stator core, 3 Insulator, 4 windings,
6a-6h Winding end, 7a-7d Cold weld, 8 Neutral point,
9a-9c Neutral point crossover wire, 10a-10c sleeve, 11 Crimp terminal,
12a to 12c Back groove, 13 Neutral point terminal, 14 Magnetic pole teeth, 15 Divided iron core,
16 yoke parts, 17 connecting parts, 18 winding parts, 19 first winding wall part, 20 second winding wall part,
21 Crossover.

Claims (5)

A stator core,
In a stator of a rotating electric machine comprising a plurality of windings wound around an insulating member around the stator core,
Each of the windings has a neutral-point crossover on the neutral-point connection side,
Each of the neutral point side crossovers does not generate stress relaxation at room temperature, and is formed of a conductive member,
The neutral point side connecting wire of each phase is connected at the neutral point,
At least one of the windings is a stator of a rotating electrical machine in which a portion other than the neutral-point crossover wire is formed of an aluminum material. The stator for a rotating electrical machine according to claim 1, wherein each of the neutral point-side connecting wires is formed of a copper material. The stator of a rotating electrical machine according to claim 1 or 2, wherein each of the neutral point-side connecting wires is composed of a single component that is separated from the neutral point into the phases. The stator of the rotating electrical machine according to any one of claims 1 to 3, wherein all portions of the windings other than the neutral point side crossover portions are formed of an aluminum material. A rotating electrical machine comprising the stator of a rotating electrical machine according to any one of claims 1 to 4 and a rotor that generates torque by being combined with the stator.

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