JPS59127564A - Motor - Google Patents

Abstract

PURPOSE:To reduce the axial thickness of a motor and to improve the characteristics of the motor by winding a toroidal winding to maintain the winding in the prescribed space to the insulating layer in thickness of a control member, then securing a stator with resin molding. CONSTITUTION:Before winding a coil 4, an annular insulating member 5 is engaged to be disposed on both end faces of the outer periphery of a stator core 1 so that the part 5a is contacted with a slot edge and the part 5b is contacted with the outer periphery of a core which includes the edge. A plurality of partition wall plates 6 which forms radially toward the outer circumferential direction in vane shape at the member 5 so that the space coincides with the stator core slot, and formed by synthetic resin molding having insulating withstand strength. Then, the coil 4 is wound from the starting end 8 by a toroidal winding machine. In this manner, the axial thickness can be significantly reduced, thereby improving the characteristics of a motor.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a stator wound in a toroidal manner, and in particular, the present invention relates to a stator having a toroidal winding. This invention relates to a motor with improved winding workability and insulation reliability during winding.

[Prior art]

One way to efficiently manufacture a stator with conventional toroidal winding is to divide the annular core into two or more locations and wind each slot with a 7-liner winding machine, or to wind the core around a bobbin in advance. There was a method of forming a stator by inserting this into an iron core yoke. However, in these methods, since the coils are divided, a large number of man-hours are required to connect each coil without error and to perform insulation treatment. Furthermore, ensuring the dimensional accuracy of the stator core,
The problem was that the motor characteristics deteriorated due to high magnetic resistance generated in the joints.

[Purpose of the invention]

The purpose of the present invention is to eliminate the drawbacks of the prior art described above, to stabilize the quality, to reduce the amount of copper wire used in the coil itself, and to make the motor body significantly thinner in the thickness direction than before. be.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described using the drawings.

FIG. 1 is an example of a single-phase, four-pole induction motor, and shows a state in which winding of the main coil has begun in the middle of manufacturing a stator. Reference numeral 1 denotes a stator core, which represents a yoke portion, is continuous in a ring shape, and is not divided at any part. 2 is a slot portion. An insulating layer made of a coating of synthetic resin or other insulating material is formed on each of these surfaces except for the rotor and the opposing surface 1a. As a coating method for forming this insulating layer, there is a method of heating the stator core 1, and then sprinkling, for example, epoxy-based insulating material powder on it in a floating state and welding it.
Electrostatic painting, spraying, brushing, and many other methods are possible. In this case, it is necessary to ensure the coating thickness and adhesive strength for the edges, and electrostatic coating is generally considered preferable. Close contact caused problems such as a decrease in dielectric strength, and great care was required. In the present invention, in order to solve these problems, the annular insulating member 5 is fitted into the stator core so that the annular insulating member 5 is located on both ends of the outer periphery of the stator core, so that the part 5a is located at the slot edge part and the part 5b is located at the edge part. It comes into contact with the outer diameter part of the core, including the core. The annular insulating member has a plurality of vane-shaped partition plates radiating toward the outer circumference, and the gaps between the partition plates are aligned with the stator core slots. These are made of a synthetic resin mold having dielectric strength, and an enlarged sectional view thereof is shown in FIG. 2, and a partial perspective view is shown in FIG. Next, the coil 4 is wound by a special toroidal winding machine from the winding start portion 8 to a predetermined number of turns. Thereafter, the wire is wound in the same manner in the next slot 6, and the winding end wire becomes the wandering wire 7.

FIG. 2 is a cross-sectional view of the yoke part of the stator before the coil 4 is wound. An insulating layer 3 is applied to the inner and outer peripheries and end faces of the yoke part 1. 5b covering the outer periphery and 5a covering the bottom edge of the slot are in contact with each other. 6 is a partition plate. Figure 3 is an enlarged three-dimensional drawing of the annular insulating member.
This is a supplementary explanatory diagram of FIG. 1, and is a diagram explaining in an easy-to-understand manner the shape of the portion 5C that contacts the slot tooth portion, the slot bottom, and the shape that contacts the corner portion of the tooth. As can be seen from FIG. 1, since the toroidal winding is wound around the yoke, a fairly strong tension is naturally applied to the slot bottom edge and the outer diameter edge. On the other hand, an insulating layer made of a paint film may have uneven film thickness and small pinholes, which are factors that reduce the dielectric strength between the coil and the iron core.

In view of this situation, if the plate thicknesses of the insulating members 5a and 5b and the length in the stacking thickness direction are appropriately selected, the coil 4 wound thereafter can be wound in an arc shape with an appropriate winding tension.
In theory, this would create a space equal to the thickness of the board. Even if it is deformed due to external force during handling, at least close contact can be avoided, and a line state that allows sufficient penetration can be maintained when applying a resin mold, which will be described later.

FIG. 4 explains the structure of the electric motor, and shows the upper half as a sectional view. Reference numeral 10 is a frame made of resin mold, in which the entire stator is integrally molded, and has a pilot part into which the end bracket is fitted.

An end bracket 11 equipped with a bearing 13 in a part of the inlet.
It has a rotor 12 and a shaft 14 supported by these, and constitutes an electric motor.

〔Effect of the invention〕

The present invention has the above-described configuration, and since the stator is a stator in which a toroidal winding is applied to the yoke portion of the slot, the coil end formed on the end face of the core can be made very small. In addition, since the insulation from the iron core is an insulating layer made of a synthetic resin coating, there is no protrusion of the folded edges on the end face like in slot litchi made of ordinary polyester film, so the coil can be tightly wound around the stator iron core. It is. Therefore, the winding circumference of the coil can be minimized, and the amount of copper used can be significantly reduced. Therefore, the motor characteristics are improved, and even with the same stacking thickness as the conventional one, it is possible to provide a highly efficient motor that is thinner in the axial direction. Furthermore, by performing toroidal winding on the stator core without dividing it into annular shapes, there is nothing that obstructs the magnetic circuit of the core, and an extremely efficient or compact design can be achieved.

On the other hand, in terms of manufacturing costs, since the coil can be wound continuously in the forward and reverse directions without being separated, there is no need for complicated connection work between coils or insulation processing work. is not necessary, resulting in a significant reduction in manufacturing costs. Furthermore, since a plurality of bulkhead plates are protruded from both end faces, the coil is not directly damaged when the stator is placed on the line, during storage, handling, etc., and can maintain an extremely stable shape. This brings about immeasurable effects such as a reduction in defects and an improvement in work efficiency.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a perspective view of a stator, FIG. 2 is a vertical sectional view of a partition plate and an insulating member, FIG. 3 is a partial perspective view thereof, and FIG. 4 is a partial longitudinal sectional view of the electric motor. DESCRIPTION OF SYMBOLS 1... Stator core 2.2... Slot, 3... Insulating layer, 4... Coil, 5... Annular insulating member, 6...
・Partition plate, 7... Crossing wire, 10... Frame, 11
...Engineering plastic, 12th 1st ward / 2nd mouth 3rd

Claims (1)

[Claims] 1. In a stator having a toroidal winding around which a yoke is wound in each slot of a non-divided annular stator core, the stator core has a surface other than a surface facing the rotor. An insulating layer made of a coating film of an insulating material is provided on each other surface, and an annular insulating member is fitted and provided on both end faces of the stator core, and the insulating member is provided with an outer diameter edge portion of the stator core. an annular portion that abuts on the edge portion and covers most of the outer peripheral surface; and a wavy molded portion that abuts on the edge portion of the stator slot and covers the slot bottom and the corner portion continuing to the teeth portion. After the toroidal winding is wound so as to maintain a certain space or at least avoid close contact with the insulating layer depending on the material thickness of these insulating members, the stator is wrapped with a resin molding, An electric motor characterized in that it is fixed with a frame, integrally formed with a frame, and can be supported by an end bracket including a bearing. , 2. 2. The electric motor according to claim 1, wherein the insulating layer is coated with a resin, and the annular insulating member is in an adhesive state. 3. The annular insulating member is characterized by having a plurality of partition plates arranged radially in the outer circumferential direction, and a toroidal winding wire passing between the partition plates and into the slot. An electric motor according to claim 1.