JPH07274422A - Method for winding electric rotary machine - Google Patents

Abstract

PURPOSE:To make extremely high the space factor of a multilayer coil. CONSTITUTION:In a winding method for a motor equipped with a hollow yoke 1 consisting of a plurality of planes on the inner surface and a plurality of salient poles 2 fixed to the inner side of a yoke 1 with multilayer coils 5 mounted to the salient poles 2, electric wires 4 having the constant rectangular cross-sectional area are wound around in multilayer with the width of wire made narrower as the thickness of multilayer winding increases and with the thickness of each wire made larger as the multilayer winding increases within a trapezoidal space surrounded by the side surface of each salient pole, inner side of the yoke 1 and pole shoes 21 of the salient poles 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding method for a rotary electric machine in which an exciting wire such as an electric motor is mounted on an iron core.

[0002]

2. Description of the Related Art Conventionally, when an exciting winding is mounted on an iron core having a projecting pole portion projecting inside a ring-shaped yoke, a pole shoe is circumferentially extended at the tip of the projecting pole, Insert a rectangular or almost trapezoidal electric wire with the same cross-sectional shape into the almost fan-shaped space between the yoke and the yoke, and wind the first layer so that the bottom of the trapezoid is in close contact with almost the entire side surface of the salient pole. , Sequentially, stack the wires of the next layer on the layer wound before, and wind the wire of the same shape between the pole shoe and the yoke from the beginning of winding to the end of winding, and wire along the inner surface of the yoke. It is disclosed that a multi-layer coil is formed so as to be arranged in an arc shape (for example, Japanese Utility Model Laid-Open No. 63-2021).
No. 43).

[0003]

However, in the prior art, when the yoke has a ring shape, the electric wires are arranged in an arc shape along the inner surface of the yoke, so that the space factor of the multilayer coil is high.
In order to increase the number of turns of the multilayer coil, as shown in FIG.
A polygonal hollow yoke 1 having an inner surface formed by a plurality of flat surfaces is formed, and a salient pole 2 is fixed to the inside of the yoke 1 to form a bobbin 3.
The electric wire 4 having a rectangular cross section is wound in multiple layers to form a multilayer coil 5.
In the case of forming a wire, there is a drawback that a wire having the same cross section has a gap between the adjacent multilayer coils 5 or between the multilayer coil 5 and the yoke 1 and the space factor of the multilayer coil 5 becomes low. It was An object of the present invention is to increase the space factor of the multilayer coil without creating a gap between the multilayer coil and the yoke or pole shoe.

[0004]

In order to solve the above problems, the present invention comprises a hollow yoke having an inner surface formed of a plurality of flat surfaces, and a plurality of convex poles fixed to the inside of the yoke. In a winding method for a rotary electric machine in which a multi-layer coil is mounted on a pole, a cross-sectional area is constant in a trapezoidal space surrounded by a side surface of each convex pole, an inside of the yoke, and a pole shoe of the convex pole, In addition, the electric wire having a rectangular cross-sectional shape in which the width is narrowed as it is wound in multiple layers, and the thickness is increased as it is wound in multiple layers, is wound in multiple layers.

[0005]

When the multilayer coil is mounted between the yoke formed of a plurality of planes and the plurality of convex poles by the above means, the wires are wound in multiple layers in order to make the cross-sectional areas of the electric wires forming the multilayer coil the same. The width of the wire becomes narrower as it goes on, while it becomes thicker as it is wound in multiple layers to form a multi-layer coil, so it fills the trapezoidal space formed between the yoke and the salient pole. You can wind the wire like so.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front sectional view showing an embodiment of the present invention. In the figure, a hollow yoke 1 whose inner surface is composed of a plurality of flat surfaces
A plurality of salient poles 2 are fixed inside the. A multi-layer coil 5 formed by winding the electric wire 4 around the bobbin 3 in multiple layers is mounted on each salient pole 2 so that the multi-layer coil 5 mounted on the adjacent salient pole 2 does not interfere. The bobbin 3 has a bottom portion 31 that is in close contact with the side surface of the salient pole 2, and an outer portion 32 that is in close contact with the inner surface of the yoke 1 and is perpendicular to the bottom portion 31.
The pole shoe 21 formed at the tip of the salient pole 2 and an inner portion 33 formed so as to be in close contact with the inside of the pole shoe 21 and perpendicular to the bottom portion 31. It does not interfere with the bobbin 3 to be mounted on 2. Since the outer portion 32 is longer than the inner portion 33, the cross section of the space surrounded by the bottom portion 31, the outer portion 32, and the inner portion 33 has a trapezoidal shape. The electric wire 4 has a rectangular cross-sectional shape, and is wound by contacting the bottom portion 31 of the bobbin 3. The first winding portion has a width that makes contact with the entire surface between the outer portion 32 and the inner portion 33. Since the wire 4 is placed in a trapezoidal space surrounded by the outer portion 32 and the inner portion 33, the width of the electric wire 4 is narrowed as it is wound in multiple layers, but it is wound in multiple layers to make the cross-sectional areas the same. The thickness of the electric wire 4 is increased as it goes. Therefore, the cross section of the multi-layer coil in which the electric wire 4 is wound in multiple layers is the bottom 31 of the bobbin 3.
Since the area of the trapezoidal space surrounded by the outer portion 32 and the inner portion 33 is almost filled up, the space factor becomes extremely high. In the method of forming the electric wire 4, the electric wire having the same cross-sectional area is sandwiched between the rollers and rolled, but the cross-sectional area is constant and the width and the thickness are different by continuously changing the length between the rollers. The continuous electric wire 4 can be obtained. Although the above embodiment has been described with respect to an example in which the electric wire is wound around the bobbin, it can be applied to the case where the electric wire is directly wound around the salient pole.

[0007]

As described above, according to the present invention, when a multi-layer coil is mounted between a yoke formed of a plurality of planes and a plurality of salient poles, the cross-sectional areas of the electric wires forming the multi-layer coil are the same. For this reason, the width of the wire is reduced as it is wound in multiple layers, while the thickness of the wire is increased as it is wound in multiple layers, and the wire is wound so as to fill the trapezoidal space. Therefore, there is an effect that the space factor of the multi-layer coil is made extremely high without generating an air gap between the multi-layer coil and the yoke or the pole shoe.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention.

FIG. 2 is a front sectional view showing a conventional example.

[Explanation of symbols]

1 yoke, 2 convex pole, 21 pole shoe, 3 bobbin, 31 bottom part, 32 outer part, 33 inner part, 4 electric wire, 5 multi-layer coil

Claims (1)

[Claims] 1. A winding method for a rotary electric machine, comprising: a hollow yoke having an inner surface formed of a plurality of flat surfaces; and a plurality of convex poles fixed to the inside of the yoke, wherein a multilayer coil is mounted on the convex poles. The trapezoidal space surrounded by the side surface of each salient pole, the inside of the yoke, and the pole shoe of the salient pole has a constant cross-sectional area and narrows as it is wound into multiple layers. A winding method for a rotary electric machine, comprising: winding an electric wire having a rectangular cross-sectional shape, the thickness of which is increased as it is wound in a plurality of layers.