JPH0412766Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a stator for small electric motors used in household and commercial equipment.

Conventional technology Conventionally, the stator of this type of electric motor was generally manufactured by
Many of them have the configuration as seen in Publication No. 56-115163. That is, as shown in FIG.
A yoke part 13 is provided on the outside of the slot 12 in which a coil (not shown) to be wound is stored. A connecting portion 15 is provided to connect the portion 11 and the adjacent tooth portion 11. Further, inner walls 16, 16 of the opening 14 facing each other
is formed parallel to the line A connecting the midpoint of the opening 14 and the center of the stator. After winding the coil, a magnetic wedge (not shown) made of a block of magnetic material is inserted into the opening 14 and the opening 14 is closed, thereby continuously connecting the yoke 13. Thus, a magnetic path was formed in the yoke portion 13.

Problems to be solved by the invention In such a conventional stator configuration, the opening 1
Since the angle at which the inner wall 16 of 4 intersects with the outer periphery of the yoke part 13 is an acute angle, the coil is likely to get caught during coil winding, causing a decrease in winding work efficiency. In addition to having a larger iron loss than a core made of iron, the iron core is made in a separate process to match the shape of the opening 14, so the fitting accuracy with the opening 14 tends to be unstable, and the yoke part 13 Since the magnetic path area also tends to be non-uniform, there are problems such as an increase in magnetic resistance in the yoke portion 13, leading to deterioration of stator characteristics.

The present invention has been made to solve the above-mentioned problems, and aims to provide a stator for an electric motor in which a coil can be easily wound and an opening can be closed after winding the coil without degrading the characteristics.

Means for Solving the Problems In order to achieve the above object, the present invention includes a yoke portion having a uniform magnetic path area on the outside of the slot in which the coil wound around the tooth portion is housed, and a yoke portion having a uniform magnetic path area on the outside of the slot in which the coil wound around the tooth portion is housed. The yoke portion of the stator main body has a connecting portion connecting the teeth to the yoke portion, and the opening portion into which the coil is inserted is located at the center of the outer end of the slot, and The inner yoke iron is divided into two concentric inner yoke parts and an outer yoke part so that the facing inner walls are parallel to the center line of the teeth on the respective sides, and after coil winding, the inner yoke iron part is The stator of the electric motor is constructed by fitting the outer yoke part and the outer yoke part into the shape before division.

Function The present invention has the above-mentioned configuration, and when the yoke is divided, the angle where the inner wall of the opening intersects with the outer periphery of the inner yoke is an obtuse angle, so that the coil does not get caught when winding the coil. . The opening after winding the coil is completely closed by the outer yoke, so
The iron loss does not increase, the fitting accuracy is stabilized, and the yoke again has a uniform magnetic path area, which prevents the magnetic resistance in the yoke from increasing and improves the stator characteristics. The decline can be prevented.

Practical Example Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

As shown in the figure, the stator main body 1 has an annular shape with a uniform magnetic path area outside a slot 3 in which a coil (not shown) wound around the teeth 2 and 2' is stored. Yoke part 4 and tooth part 2 inside the slot 3.
and a connecting portion 7 that connects the tooth portion 2'.
Further, in the yoke part 4 of the stator main body 1, the opening 5 into which the coil is inserted is located at the center of the outer end of the slot 3, and the opposing inner walls 6 and 6' of the opening 5 belong to the yoke part 4. It is divided into two concentric inner iron parts 4a and outer iron parts 4b so as to be formed parallel to the center line B or B' of the side teeth 2 or 2', and after the coil winding, The inner yoke part 4a and the outer yoke part 4b are fitted into the shape before division to form a magnetic path in the yoke part 4.

In the above configuration, when the yoke 4 is divided, the angles at which the inner walls 6, 6' of the opening 5 and the outer periphery of the inner yoke intersect are obtuse angles, and the opening 5
spreads out toward the outer periphery of the stator main body 1 in a tapered shape, so that the coil does not get pinched during coil winding, and it becomes easy to insert a jig during coil winding. In addition, the opening 5 after coil winding is completely closed by the outer joist 4b of the core, which is laminated at the same time as the stator main body 1, so iron loss does not increase and the fitting accuracy is also higher than that of the conventional one. The yoke part 4 has a uniform magnetic path area, which prevents an increase in the magnetic path resistance in the yoke part 4.
Deterioration of characteristics can be prevented.

In the embodiment, the shape of the stator is a rounded shape, but the present invention may also be applied to a stator of a capacitor-type motor without causing any difference in function and effect.

Effects of the Invention As is clear from the above embodiments, according to the present invention, the opposing inner walls of the opening provided at the center of the outer end of the slot are formed parallel to the center line of the teeth on the respective sides. In addition, since the yoke with a uniform magnetic path area is divided into two concentric circles,
It is possible to provide a stator for an electric motor which is effective in improving the efficiency of coil winding work and in which openings can be closed after coil winding without deterioration of characteristics.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a stator of an electric motor according to an embodiment of the present invention, FIG. 2 is an enlarged view of the same main part, and FIG. 3 is a plan view of a stator of a conventional electric motor. 1... Stator body, 2, 2'... Teeth, 3...
Slot, 4...Yoke part, 4a...Inner yoke part, 4
b... Outer iron part, 5... Opening, 6, 6'... Inner wall, 7... Connecting part.

Claims (1)

[Scope of utility model registration request] A fixing device having a yoke portion having a uniform magnetic path area on the outside of a slot in which a coil to be wound around the tooth portion is housed, and a connecting portion connecting the tooth portions to each other on the inside of the slot. The yoke part of the child body is arranged so that the opening into which the coil is inserted is located at the center of the outer end of the slot, and parallel to the center line of the tooth part on the side to which the opposing inner walls of the opening belong, respectively. It is divided into two concentric inner and outer yoke parts so as to form the same shape, and after coil winding, the inner and outer yoke parts are fitted into the shape before division. A stator for an electric motor.