JPH0880001A - Stator of motor - Google Patents

Abstract

PURPOSE: To suppress the temperature rise of the winding by suppressing the spreading of the winding in a slot to improve the conductivity of heat generated from the winding. CONSTITUTION: The cross section of a pressing member 6 which is inserted in the vicinity of an opening of a slot to insulate and cover an opening part 3 is determined so that the ratio of the sum of the cross section of an insulated film 5, the total cross section of the winding 4 and the cross section of the pressing member 6 to the cross section of the slot may be 70-80%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for a small electric motor used for driving a fan such as a fan or a ventilation fan.

[0002]

2. Description of the Related Art In recent years, in the stator of this type of electric motor, while pursuing further cost rationalization by promoting mechanization of the production process, there is a strong demand for improvement in performance and quality. Has been done.

Conventionally, the stator of this type of electric motor has a structure as shown in FIGS. That is, the annular stator core 101 has a yoke portion 101a forming a magnetic path.
And a plurality of tooth portions 101 that protrude to the inner peripheral side and form magnetic poles.
The inner surface of the slot 102, which is formed by adjacent tooth portions 101b, is provided with an in-slot insulating film 105 that electrically insulates. Where winding 1
In 04, the necessary amount is separately wound, inserted through the opening 103, and after insertion, a slot opening insulating wedge 106 bent into a film-like substantially trapezoidal shape is wound around the opening 103 and the in-slot insulating film 105. It was to be mounted between the lines 104.

In the above structure, since the winding 104 is inserted through the relatively narrow opening 103, the total cross-sectional area of the winding 104 is only about 30% to 40% of the cross-sectional area of the slot 102. Therefore, the winding 104 inserted in the slot 102 is expanded in the slot 102 due to the springback effect.

[0005]

In such a conventional stator of the electric motor, the winding 104 expanding in the slot 102 is caused by an air layer around each wire of the winding 104. Insulation film 105 in slot
There are few windings 104 that come into contact with the winding 10 when the motor is operating.
The conductivity of heat emitted from No. 4 will be significantly reduced.
That is, the winding 104 to the insulating film 105 in the slot
There is a problem that heat conduction to the stator core 101 is not smoothly performed via the coil, heat is accumulated in the winding 104, and the temperature rise value exceeds the standard of the insulation temperature.

As a measure to increase the heat radiation area in order to suppress the temperature rise of the winding 104, the stator core 1
It is conceivable to increase the lamination length of No. 01 or the diameter. Although this method also has some effect, it does not lead to the fundamental solution of improving heat conduction, and on the contrary, another problem of increasing the material cost may occur.

The present invention solves the above-described problems, and suppresses the spread of the winding in the slot, thereby improving the conductivity of heat generated from the winding and reducing the temperature rise of the winding. The purpose is to provide a stator.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, a stator of an electric motor of the present invention has a first means in which a slot formed by adjacent teeth of a stator core insulates an inner surface thereof. An insulating film in the slot, a winding wire inserted through the opening, and a pressing member that is inserted near the opening of the slot to insulate and close the opening,
The pressing member has a cross-sectional area formed such that the ratio of the cross-sectional area of the insulating film in the slot to the cross-sectional area of the slot, the total cross-sectional area of the windings, and the total cross-sectional area of the pressing member is 70% to 80%. And

In order to achieve the first purpose, the second
This means is configured such that a taper portion is formed on the winding side and the opening side of the tip of the pressing member in the insertion direction, and a brim-shaped locking portion is provided on the opening side in the opposite insertion direction.

[0010]

According to the present invention, the structure of the first means described above eliminates the space in which the winding extends because the winding and the pressing member are present in the slot, and the windings come into contact with each other and are pressed against the insulating film in the slot. I will guess.

Further, according to the structure of the second means, the pressing member can be easily inserted between the winding and the insulating film in the slot, and the stress applied to the winding by the pressing member can be reduced. The locking part comes into contact with.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

As shown in the figure, an annular stator core 1 is provided with a yoke portion 1a forming a magnetic path and a plurality of tooth portions 1b protruding toward the inner peripheral side to form magnetic poles. On the inner surface of the slot 2 formed by 1b, an in-slot insulating film 5 for electrically insulating is mounted. Here, the winding 4 is separately wound by the required amount, and the opening 3
After inserting, the winding 4 and the insulating film 5 in the slot after insertion
The pressing member 6 made of an insulating material is inserted between them. The pressing member 6 has a length dimension in the insertion direction that is made as large as possible to be larger than the lamination length of the stator core 1 so that the insulation distance between the winding 4 and the stator core 1 can be sufficiently secured, and the sectional shape of the slot 2. The shape is substantially the same as the shape in the vicinity of the opening 3, and the surface for pressing the winding 4 is formed in a flat shape. The cross-sectional area of the pressing member 6 is such that the ratio of the cross-sectional area of the insulating film 5 in the slot to the cross-sectional area of the slot 2, the total cross-sectional area of the windings 4, and the total cross-sectional area of the pressing member is 70% to 80%. Is formed. The larger this ratio, the more desirable it is to eliminate the air layer in the slot, but in reality there is a limit,
In addition, the workability of inserting the pressing member 6 is reduced.

With the above structure, the winding is pressed by the pressing member in the slot, and the windings can be brought into contact with each other to reduce the interposition of the air layer, and the winding can be pressed against the insulating film in the slot.

As described above, according to the stator of the electric motor of the first embodiment of the present invention, the heat generated in the winding is smoothly transferred to the stator iron core, and the heat is accumulated in the winding. Disappears.

Next, the second embodiment of the present invention will be described with reference to FIG.
Also, description will be made with reference to FIG.

The same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. As shown in the figure, tapered portions 6a are formed at both ends in the insertion direction of the pressing member 6 in the radial direction, that is, on the opening 3 side and the side in contact with the winding 4. Further, a brim-shaped engaging portion 6b is formed on the opening 3 side in the opposite insertion direction.

With the above structure, when the pressing member is inserted,
Insertion workability becomes difficult because the cross-sectional area of the pressing member itself is considerably large, but the tip of the pressing member is relatively easily inserted between the winding and the insulating film in the slot due to the formation of the tapered portion. The stress exerted on the winding can be relieved, and the pressing member can be held and fixed in position by bringing the locking portion into contact with the end surface of the stator core.

As described above, according to the stator of the electric motor of the second embodiment of the present invention, when the pressing member is inserted, a part of the winding is not caught or the pressing member itself does not fall off.

[0020]

As is apparent from the above embodiments, according to the present invention, the windings are pressed by the pressing member in the slots, the windings come into contact with each other, and the insulating film in the slot comes into contact with each other. It is possible to provide a stator of an electric motor in which heat is smoothly conducted from the winding wire to the stator core and the temperature rise of the winding wire can be reduced.

Further, even if the cross-sectional area of the pressing member changes depending on the winding amount of the winding wire, since the tip end in the insertion direction has a taper portion, insertion between the winding wire and the insulating film in the slot becomes easy. , Workability is improved. Further, it is possible to provide a stator of an electric motor which can reduce the stress applied to the winding wire and ensure the stability of the quality by ensuring the position fixing by the locking portion.

[Brief description of drawings]

FIG. 1 is a perspective view showing slots of a stator of an electric motor according to first and second embodiments of the present invention.

FIG. 2 is a sectional view showing slots of the stator of the electric motor of the first embodiment.

FIG. 3 is a vertical sectional view showing a pressing member of a stator of an electric motor of the second embodiment.

FIG. 4 is a perspective view showing slots of a stator of a conventional electric motor.

FIG. 5 is a sectional view of the same.

[Explanation of symbols]

 1 Stator Iron Core 2 Slot 3 Opening 4 Winding 6 Pressing Member 6a Tapered Part 6b Locking Part

Claims (2)

[Claims] 1. A stator core has an annular yoke portion that forms a magnetic path, and a plurality of tooth portions that project in the inner circumferential direction of the yoke portion, and is formed by the adjacent tooth portions. The slot includes an in-slot insulating film that insulates the inner surface, a winding wire inserted through the opening, and a pressing member that is inserted near the opening of the slot to insulate and close the opening. The cross-sectional area of this pressing member was formed such that the ratio of the cross-sectional area of the insulating film in the slot to the cross-sectional area of the slot, the total cross-sectional area of the winding, and the total cross-sectional area of the pressing member was 70% to 80%. Electric motor stator. 2. A taper portion is formed on the winding side and the opening side of the tip end of the pressing member in the insertion direction, and a brim-shaped locking portion is provided on the opening side in the opposite insertion direction. Electric motor stator.