JP2012029348A - Stator, rotary electric machine, and winding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator, a rotary electric machine, and a winding method increasing the degree of freedom of a coil shape and improving a torque characteristic by increasing a space factor.SOLUTION: In a coil 1a of a motor stator 1 in which a plurality of wire rods are wound in a multiple layer shape together as a bundle, the plurality of wire rods 109 and 110, 111 and 112, 113 and 114, and 115 and 116 that are wound together include a structure in which the plurality of wire rods are not wound around a single layer but wound around multiple layers, respectively.

Description

  The present invention relates to a stator, a rotating electrical machine, a winding method, and the like.

  Conventionally, it is known that a plurality of wires are wound simultaneously as a bundle (see Patent Document 1). Thereby, it is possible to improve the torque performance of the motor by increasing the space factor of the coil formed in the stator of the motor.

JP 2003-204659 A

  However, when winding multiple wires simultaneously as a bundle, the winding formed in one rotation becomes wider, so the required cross-sectional shape of the coil is compared to winding a single wire. It may be difficult to approach.

  Accordingly, the present invention provides a stator, a rotating electrical machine, and a winding method that can form a plurality of layers of windings close to the required cross-sectional shape of the coil and that have an improved space factor.

In order to solve the above-described problems, according to one aspect of the present invention, a stator in which a plurality of wires are wound on a plurality of layers on a stator core, the plurality of wires being A stator is applied, comprising: a parallel winding portion wound side by side in the same layer; and a stepped winding portion in which the plurality of wires are wound across a plurality of layers. The
According to another aspect of the present invention, there is provided a rotating electrical machine including a rotor and a stator in which a plurality of wires are wound on a plurality of layers with respect to a stator core, A parallel winding portion in which the plurality of wires are wound side by side in the same layer, and a stepped winding portion in which the plurality of wires are wound across a plurality of layers, A rotating electrical machine is applied.
Further, according to another aspect of the present invention, there is provided a winding method for winding a plurality of wires on a plurality of layers on a stator core, wherein the plurality of wires are arranged in the same layer. A winding method is applied, which includes a parallel winding step of winding the wire in steps and a step winding step of winding the plurality of wires across a plurality of layers.

  According to the present invention, there are provided a stator, a rotating electrical machine, and a winding method capable of forming a plurality of layers of windings close to the required cross-sectional shape of the coil and improving the space factor. Can do.

1 is a cross-sectional view of a motor according to a first embodiment of the present invention. It is sectional drawing of the motor core which concerns on 1st Embodiment of this invention. It is a side view of the motor core which performed general winding. It is a side view of a motor core which performed winding concerning a 1st embodiment of the present invention. It is sectional drawing of the motor core which performed the coil | winding which concerns on 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, about the same structure, the same code | symbol is attached | subjected and duplication description is abbreviate | omitted suitably.

<First Embodiment>
FIG. 1 is a cross-sectional view of a motor which is an example of the rotating electrical machine of the present invention. The stator 1 is obtained by winding a coil 1a as an example of a wire around a stator core 1b. The stator 1 is fixed by a frame 1c. There are two types of stator cores 1b, which are integrally formed in an annular shape, and divided cores that are used by combining a plurality of divided cores in an annular shape. On the other hand, the rotor 2 has a structure in which a rotor core 2b and a magnet 2c are provided on a shaft 2a, and the rotor 2 rotates via a stator 1 and a bearing 3.
That is, this motor is a rotating electrical machine including a rotor 2 and a stator 1 in which a plurality of wires 1a are wound around a plurality of layers with respect to a stator core 1b. Thus, a parallel winding portion in which a plurality of wires are wound side by side in the same layer and a stepped winding portion in which the plurality of wires are wound across a plurality of layers are included.

  FIG. 2 schematically shows a cross section of the stator 1 excluding the frame 1c. However, this figure uses a split core as an example. In the split core, since the coil 1a and the core 1b are assembled in an annular shape, the cross section of the space around which the coil 1a is wound is not a rectangle but a trapezoid or a shape close thereto. For this reason, the space of the core 1b that can be wound is narrower on the inner peripheral side of the motor, and the number of turns of the coil 1a is larger on the outer peripheral side of the motor.

  FIG. 3 shows one slot of the split core wound by a method in which two general coils 1a are wound simultaneously as a bundle. When winding two wires at the same time as a bundle, the first layer of the lowest layer is wound two by two (parallel winding process) from the wires 101, 102 to the wires 103, 104, and the second layer when reaching the end Step up to the eyes. At this time, as described in the previous stage, there is a case where an area that can be wound is narrow on the inner peripheral side of the motor and the accommodation of the wire material is deteriorated. In this case, as shown by the wires 105 and 106, the first wire of the second layer is wound across the plurality of wires of the first layer and moved to the outer peripheral side of the motor having a wider area. To do. In the example of FIG. 3, the wires 107 and 108 are stepped up from the third layer to the fourth layer by the same method, the wires 119 and 120 are stepped up from the fifth layer to the sixth layer, and a coil is formed from the six layers of wire. is doing. When going up the step, the wire that has largely crossed the plurality of lower wires is closest to the ridgeline of the trapezoidal region that houses the coil 1a, as can be seen in the sectional view. In the example of FIG. 3, if the windings are further increased in the third layer and the fifth layer, the wires 107 and 119 that go up the step do not fit in the trapezoidal area. It is up.

  FIG. 4 shows a coil 1a when the winding method of the present invention is applied to the wire shown in FIG. In this figure, from the first layer to the fourth layer, the same winding as shown in FIG. 3 is performed (parallel winding process), and the fourth and fifth layers are wound. The forming method is according to the present invention. A method for forming the fourth layer and the fifth layer will be described in detail. After winding the step up to the fourth layer with the wires 107 and 108, the winding to the fourth layer is performed twice as usual (parallel winding process). Next, the wire rods 109 and 110 are wound. At this time, the wire rod 109 is wound on the fifth layer above the fourth layer, and the wire rod 110 is wound on the fourth layer as usual. Wire (uneven winding process). After that, in the same way as the wires 109 and 110, one of the two wires that are wound at the same time is wound as the fifth layer (wires 111, 113, and 115), and the remaining one is wound to the fourth layer. Winding (wires 112, 114, 116). By winding multiple stages simultaneously in one turn in this way, the fifth layer can be wound without stepping up across the underlying wire, and more in the fifth layer. The coil 1a can be wound. In the example of FIG. 4, one turn can be wound to the sixth stage, and the space factor is improved.

In addition, FIG. 4 shows an example in which the fourth layer and the fifth layer are wound at the same time, but the same method is used when winding other layers such as the second layer and the third layer. But it can be applied and can be combined freely with a normal step up.
<Second Embodiment>

  In the motor winding, as shown in FIG. 3, the wire rods 101 and 102 wound first and the wire rods 119 and 120 wound last are positioned on the outer peripheral side when the motor is assembled. In many cases, it is difficult to change the positions of the beginning and end of winding of the wire rod due to the motor design. As shown in Fig. 3, when the beginning and end of the wire are at the same position on the outer peripheral side of the motor, if only the conventional step-up method is applied, the number of steps that can be wound is always an even number and there is room for space. Even then, the next layer may not be formed. FIG. 5 shows a cross-sectional view of a stator coil 1a in which the step winding method according to the present invention is applied and an odd number (three layers) of winding is applied. In the case of FIG. 5, the winding is started from the wires 121 and 122, and the middle of the second layer is formed in a normal step (parallel winding method), and the second and third layers are simultaneously formed from the wires 123 and 124. (Uneven winding method). In this way, in the example of FIG. 5, by winding a plurality of layers simultaneously, an odd number of stages can be formed, and the space factor can be greatly improved.

By combining the step winding method of the present invention and a normal step-up, the number of winding layers can correspond to both even and odd numbers, and a winding method suitable for each stator core 1b. You can choose freely.
Therefore, in the stator 1 of the motor that simultaneously winds a plurality of wires as a bundle, it provides a method for winding up the stepped wires across multiple layers in a good manner, improving the space factor, and the motor torque characteristics Can be increased.

  The embodiment of the present invention has been described above. However, a so-called person skilled in the art can appropriately modify the above embodiment without departing from the gist of the present invention, and can appropriately combine the above embodiment and the method according to the modified example. It is. That is, it goes without saying that even a technique with such changes is included in the technical scope of the present invention.

  For example, in the above embodiment, the case where two bundles of wire rods are wound at the same time has been described as an example. However, even if the bundle of wire rods wound simultaneously is increased to three or four, the basic idea is the same. By forming the coil 1a across multiple layers in one turn, the degree of freedom of the coil shape is expanded, and windings suitable for each stator core 1b can be realized and the space factor can be improved. it can.

1 Stator 1a Coil 1b Stator Core 1c Frame 2 Rotor 2a Shaft 2b Rotor Core 2c Magnet 3 Bearing

Claims (3)

A stator in which a plurality of wires are wound on a plurality of layers over a stator core,
A parallel winding portion in which the plurality of wires are wound side by side in the same layer;
A step winding portion in which the plurality of wires are wound across a plurality of layers; and
The stator characterized by including. A rotor,
A stator in which a plurality of wires are wound on a plurality of layers with respect to the stator core; and
A rotating electric machine with
A parallel winding portion in which the plurality of wires are wound side by side in the same layer;
A step winding portion in which the plurality of wires are wound across a plurality of layers; and
A rotating electrical machine. A winding method for winding a plurality of wires on a plurality of layers on a stator core,
A parallel winding step of winding the plurality of wires in the same layer;
A step winding process for winding the plurality of wires across a plurality of layers;
The winding method characterized by including.

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