JPH0767277A - Motor for washing machine - Google Patents

Abstract

PURPOSE:To achieve smooth rotation while suppressing noise without requiring enhancement of machining accuracy or a wide air gap. CONSTITUTION:An insulation coating 10 is applied to the surface of a rotor 5 opposing a stator 3 or the surface of the stator 3 opposing the rotor 5 thus ensuring an insulation distance corresponding to the thickness thereof. Consequently, the stator 3 and the rotor 5 do no come into contact with each other even if the air gap 6 is set narrow. The insulation coating 10 is formed through application of an insulation film, coating of an insulation paint, or thermal shrinkage of an insulation tube.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine motor having an improved air gap portion.

[0002]

2. Description of the Related Art Conventionally, a washing machine motor, like other motors, comprises a stator and a rotor, and an air gap is secured between the stator and the rotor.

In this case, when the stator and the rotor come into contact with each other, the magnetic flux concentrates at the contact point, causing a mechanical catch, which prevents the rotor from rotating smoothly. Also, noise will be generated. Therefore, conventionally, the required air gap is ensured by increasing the processing accuracy or widening the air gap.

[0004]

However, in the case of improving the above-mentioned processing accuracy, the cost rises,
On the other hand, when the air gap is widened, there is a problem that the efficiency of the motor is lowered.

The present invention has been made in view of the above-mentioned circumstances, and therefore an object thereof is to obtain smooth rotation and generate noise without increasing machining accuracy and widening an air gap. It is to provide a washing machine motor that can be avoided.

[0006]

In order to achieve the above object, the washing machine motor of the present invention is first characterized in that the surface of the rotor facing the stator is provided with an insulating coating.

In the washing machine motor of the present invention, the second
In addition, the surface of the stator facing the rotor is coated with an insulating coating.

In these cases, the insulating coating is preferably applied by sticking an insulating film.

The insulating coating may be applied by applying an insulating paint.

Further, the insulating coating may be applied by heat shrinkage of the heat shrinkable insulating tube.

[0011]

According to the above means, the insulation distance corresponding to the thickness is secured by the insulating coating applied to the surface portion of the rotor facing the stator or the surface portion of the stator facing the rotor.
Even if the air gap is narrowed, the stator and the rotor do not come into contact with each other. Therefore, it is not necessary to increase the processing accuracy and it is not necessary to widen the air gap.

Further, the insulating coating can be easily applied by sticking an insulating film, applying an insulating paint, or heat-shrinking the heat-shrinkable insulating tube.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, FIG. 1 shows the overall structure of a motor for a washing machine. A stator 3 is caulked inside a lower bracket 1 and an upper bracket 2 with a rivet 4, and a rotor 5 is provided inside the stator 3 with an air gap 6 therebetween. The shaft 7 is supported by the lower bracket 1 and the upper bracket 2 via bearings 8 and 9, respectively.

The stator 3 comprises a core 3a and a coil 3b mounted on the core 3a, while the rotor 5 is provided.
Is composed of a core 5a and a cage conductor 5b mounted on the core 5a, and an insulating coating 10 is applied to the outer peripheral surface of the core 5a, which is the surface of the rotor 5 facing the stator 3.

In this case, as shown in FIG. 2, the insulating coating 10 is formed by applying an insulating film 11 made of polyester or polypropylene to the outer peripheral surface of the rotor core 5a while adhering it with an adhesive, and winding end thereof. The portion preferably coincides with the winding start end portion, but may slightly overlap as shown in FIG. This is because even if the overlapped portion hits the stator 3, it is scraped by rotation and has the same thickness as the other portions.

As described above, in this structure, the outer peripheral surface of the rotor core 5a is provided with the insulating coating 10, and an insulating distance corresponding to the thickness of the insulating coating 10 is secured between the rotor core 5a and the stator 3. Therefore, even if the air gap 6 is narrowed, the stator 3 and the rotor 5 do not come into contact with each other, smooth rotation can be obtained, and noise can be prevented. Therefore, in this case as well, it is not necessary to increase the machining accuracy, it is possible to achieve cost reduction, and it is not necessary to widen the air gap 6, so that the motor efficiency can be improved.

Further, the insulating coating 10 can be easily applied by applying the insulating film 11 thereto.

FIGS. 4 and 5 show a second embodiment of the present invention, in which the insulating film 12 is wrapped around the outer peripheral surface of the core 3a, which is the surface of the stator 3 facing the rotor 5, with an adhesive. This shows that the insulating coating 13 is applied by doing so. Even in this case, the same effect as the first embodiment can be obtained.

FIG. 6 shows a third embodiment of the present invention.
An insulating coating 17 is applied to the outer peripheral surface of the rotor core 5a by transferring an insulating coating 14 made of an insulating film solution from a coating container 15 with a brush 16 and applying it. Also, since the insulating distance corresponding to the thickness of the insulating coating 17 is secured between the rotor 5 and the stator 3, and the insulating coating 17 can be easily applied, the same operational effect as that of the first embodiment can be obtained. it can.

FIG. 7 shows a fourth embodiment of the present invention.
Insulating paint consisting of insulating film solution in paint container 18
9. Immerse the rotor 5 in 9 and insulate the outer peripheral surface thereof with the insulating coating 2
It is shown that 0 is applied, and even in this case, the same effect as that of the first embodiment can be obtained.

FIG. 8 shows a fifth embodiment of the present invention.
Insulating paint 2 consisting of insulating film solution in paint container 21
It shows a structure in which the rotor 5 is placed on the rolls 23 and 24 impregnated with 2 and rotated to apply the insulating coating 25 to the outer peripheral surface portion of the rotor core 5a. It is possible to obtain the same effect as that of the embodiment.

FIG. 9 shows a sixth embodiment of the present invention.
Insulating paint 2 consisting of insulating film solution in paint container 26
7 shows a structure in which the stator 3 is dipped in 7 and the insulating coating 28 is applied to the peripheral surface portion, particularly the inner peripheral surface portion. Even in this case, the same effect as in the first embodiment can be obtained. be able to.

FIGS. 10 and 11 show a seventh embodiment of the present invention, in which the rotor 5 is surrounded by a heat-shrinkable insulating tube 29, and heat is applied to the rotor 5 to shrink it.
The rotor core 5a is shown with an insulating coating 30 on the outer peripheral surface thereof.
Since the insulation distance corresponding to the thickness of the insulation coating 30 is secured between the stator 3 and the stator 3, and the insulation coating 30 can be easily applied, it is possible to obtain the same effect as that of the first embodiment.

In addition, the present invention is not limited to the embodiment described above and shown in the drawings, and is not particularly limited to the radial gap type motor in which the stator and the rotor face each other in the radial direction as the whole motor. It can be applied to axial gap type motors that face each other in the axial direction, and can also be applied to so-called outer rotation type motors in which the rotor rotates outside the stator rather than inside the stator. It can be carried out by appropriately changing it within.

[0025]

The washing machine motor of the present invention is as described above, and has the following effects. Firstly, the surface of the rotor facing the stator is covered with an insulating coating, so that the machining accuracy is not increased, there is no need to widen the air gap, smooth rotation is obtained, and noise is not generated. can do.

Secondly, since the surface of the stator facing the rotor is provided with an insulating coating, the processing accuracy is not increased and it is not necessary to widen the air gap, and smooth rotation can be obtained. It is possible to prevent noise.

Thirdly, since the above-mentioned insulating coating is applied by sticking an insulating film, the insulating coating can be easily applied.

Fourthly, since the insulating coating is applied by applying an insulating coating, the insulating coating can be easily applied.

Fifth, since the insulating coating is applied by the heat shrinkage of the heat shrinkable insulating tube, the insulating coating can be applied easily.

[Brief description of drawings]

FIG. 1 is an overall vertical sectional view showing a first embodiment of the present invention.

FIG. 2 is a perspective view of the rotor in the middle of insulation coating.

FIG. 3 is a perspective view of the same insulation coating completed state.

FIG. 4 is a perspective view of a stator according to a second embodiment of the present invention in a state where an insulation coating is being performed.

FIG. 5 is a perspective view of the same insulating coating completed state.

FIG. 6 is a perspective view of a rotor according to a third embodiment of the present invention in the middle of insulation coating.

FIG. 7 is a perspective view of a rotor according to a fourth embodiment of the present invention in a state in which insulation coating is being performed.

FIG. 8 is a cross-sectional view of a rotor according to a fifth embodiment of the present invention in a state where insulation coating is in progress.

FIG. 9 is a perspective view of a sixth embodiment of the present invention in a state where the stator is in the middle of insulation coating.

FIG. 10 is a perspective view of a rotor according to a seventh embodiment of the present invention in a state where an insulating coating is being performed.

FIG. 11 is a perspective view showing a state where the insulation coating is completed.

[Explanation of symbols]

3 is a stator, 3a is a stator core, 5 is a rotor, 5
a is a rotor core, 6 is an air gap, 10 is an insulating coating, 11 and 12 are insulating films, 13 is an insulating coating, 14
Is an insulating coating, 17 is an insulating coating, 19 is an insulating coating, 20 is an insulating coating, 22 is an insulating coating, 25 is an insulating coating, 27 is an insulating coating, 28 is an insulating coating, 29 is an insulating coating, 29 is a heat shrinkable insulating tube, and 30 is insulating. The coating is shown.

Claims (5)

[Claims] 1. A motor for a washing machine comprising a stator and a rotor, wherein a surface portion of the rotor facing the stator is provided with an insulating coating. 2. A washing machine motor comprising a stator and a rotor, wherein a surface of the stator facing the rotor is provided with an insulating coating. 3. The motor for a washing machine according to claim 1, wherein the insulating coating is applied by adhering an insulating film. 4. The washing machine motor according to claim 1, wherein the insulating coating is applied by applying an insulating paint. 5. The washing machine motor according to claim 1 or 2, wherein the insulating coating is applied by thermal contraction of a heat-shrinkable insulating tube.