KR20130019086A - Stator of motor - Google Patents

Abstract

The stator of the EPS motor according to the present invention includes a stator core coupled to a cylindrical motor housing; A plurality of coils wound inside the stator core; And insulating paper disposed to surround the outside of the plurality of coils, wherein the insulating paper is bent into a 'c' shape and inserted into a lower side of the stator core facing the bottom surface of the motor housing. It is done.

Description

EPS motor stator {STATOR OF MOTOR}

The present invention relates to a stator of an EPS motor.

In general, a steering device assisted by a separate power is used as a device to ensure the stability of steering of the vehicle. Conventionally, such an auxiliary steering device is used as a device using hydraulic pressure, but recently, an electric power steering system (Electronic Power Steering System) having low power loss and high accuracy is used.

The electric steering device (EPS) as described above drives the motor in an electronic control unit (ECU) according to the driving conditions sensed by the vehicle speed sensor, torque angle sensor, torque sensor, etc. to ensure turning stability and provide fast resilience. This allows the driver to drive safely.

In this EPS system, the motor assists the driver to operate the steering wheel for steering, so that the steering operation can be performed with less force. The motor uses a BLDC motor.

In general, the BLDC motor is coupled to the housing and the cover member to form an exterior of the motor, and a stator is provided on an inner circumferential surface of the housing, and the center of the stator is rotatable according to electromagnetic interaction with the stator. A rotor to be installed is provided. The rotor is rotatably supported by a rotating shaft, and a steering shaft of the vehicle is connected to an upper portion of the rotating shaft to provide power to assist steering as described above.

However, since the coils wound around the teeth of the split cores forming the stator core are very tightly arranged, a very careful process management is required in winding the coils so that the cores wound on the teeth do not contact each other and cause a short. However, since the distances between the coils wound around the teeth are very close, there is a problem that a product defect occurs when an operator's mistake or the like occurs in the assembling process, and improvement is required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a stator of an EPS motor having improved coil-to-coil insulation structure so that a short can be prevented from occurring due to interference with coils wound around teeth of adjacent split cores.

The stator of the EPS motor according to the present invention includes a stator core coupled to a cylindrical motor housing; A plurality of coils wound inside the stator core; And insulating paper disposed to surround the outside of the plurality of coils, wherein the insulating paper is bent into a 'c' shape and inserted into a lower side of the stator core facing the bottom surface of the motor housing. It is done.

Preferably, the insulating paper surrounds a portion of the plurality of coils, and the insulating paper is not disposed in a coil adjacent to the coil wrapped with the insulating paper.

In addition, the folded portion of the insulating paper is in contact with the bottom surface of the motor housing, it is preferable that both ends of the insulating paper toward the opening surface side of the motor housing.

According to the present invention as described above, by using the insulating paper, the interference between the coils wound on the teeth of the split core is excluded, it is possible to prevent a malfunction such as a motor short caused by the coil interference.

In addition, since the insulating paper is folded into the letter 'c', the blocked portion is configured to face the bottom surface of the motor housing into which the stator core is inserted and coupled, so that no separate separation prevention mechanism is required.

1 is an exploded perspective view of an insulating paper and a stator core according to an embodiment of the present invention;
2 and 3 is a view showing the assembled state of the insulating paper and the stator core of Figure 1,
Figure 4 is a cross-sectional view showing a state in which the stator is coupled to the motor housing according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

1 is an exploded perspective view showing a coupling relationship between the insulating paper and the stator core according to an embodiment of the present invention, Figures 2 and 3 are a plan view showing a coupling state of the insulating paper and the stator core, Figure 4 is a stator in the motor housing Is a view showing a coupled state.

In general, a plurality of teeth (not shown) are formed to protrude toward the center of the stator core 100, and coils 110 are tightly wound around the teeth, respectively. In order to wind the coils 110, the stator core 100 is composed of a plurality of split cores, and these split cores are assembled in a coil wound state to form a cylindrical stator core 100.

1 is a diagram illustrating a process of inserting the insulating paper 200 into the stator core 100 in which the coil is wound.

As shown, the insulating paper 200 is a paper used as an electrical insulating material, it is made so that the electricity does not pass by using a method, such as a synthetic resin having an insulating component contained in the fiber particles of the paper, physical The characteristics are not much different from general paper, but are formed of a material having excellent insulation.

The insulating paper 200 is folded into a substantially 'c' shape, and the bottom surface of the insulating paper 200 may be inserted to be disposed on the bottom surface of the stator core 100. That is, as shown in Figures 2 and 3, the bottom surface of the insulating paper 200 is disposed on the bottom surface of the stator core 100, the coil 110 is configured to expose only every other one, The upper side surface of the stator core 100, in which the coil terminals 111 connected to the coil 110 protrude, is configured to expose all the wound coils 110.

According to this coupling relationship, as shown in FIG. 4, when the bottom surface of the stator core 100 is inserted and coupled to the closed bottom surface 11 of the motor housing 10, the insulating paper ( The folded bottom surface of 200 is also in close contact with the bottom surface 11 of the motor housing 10.

Then, even if the insulating paper 200 does not provide a separate separation preventing means, the insulating paper 200 is not separated unless the insulating paper 200 is forcibly pulled out through the open opening 12 of the motor housing 10.

Meanwhile, as shown in FIG. 1, the insulating paper 200 may be inserted into the stator core 100 where the coils 110 are all wound and the coupling is completed. In this case, adjacent coils 110 may be inserted. Due to the interference therebetween, the insertion process of the insulating paper 200 may not be easy.

Therefore, during the process of winding the coil 110 to the split core, a process of winding the insulating paper 200 is performed in advance, and after the insulating paper 200 surrounds the outer circumferential surface of the coil 110, the divided cores are assembled to The stator core 100 may be formed.

In addition, according to an exemplary embodiment of the present invention, the insulating paper 200 may be arranged to surround the outer circumferential surface of all coils 110, but the purpose of the insulating paper 200 is to prevent interference between adjacent coils 110. In view of the fact that it is to prevent, it is not necessary to arrange the insulating paper 200 so as to surround the outer peripheral surface of all the coils (110).

That is, as shown in FIGS. 2 and 3, when the insulating paper 200 is inserted into one coil 110 to surround the outer circumferential surface, the insulating paper 200 is close to the coil 110 surrounding the outer circumferential surface. It is not necessary to insert and insert the insulating paper 200 into the coils 110 disposed in position.

For example, in the case of the stator core 100 formed by joining a total of 12 split cores, the number of coils 110 wound on the teeth of the split cores is 12. In this case, the insulating paper 200 may be installed only in a total of six coils 110. FIGS. 2 and 3 alternately alternately wrap the coil 110 wrapped with the insulating paper 200 and the coil 110 not wrapped with the insulating paper. It is a figure which shows the state arrange | positioned.

According to the present invention as described above, since the coils 110 wound around the stator core 100 are insulated by the adjacent coils 110 and the insulating paper 200, the occurrence of a short due to contact between the coils 110 is prevented. It is possible to prevent, it is possible to lower the management level of the coil winding process compared to the conventional it is possible to reduce the management cost.

In the foregoing, the present invention has been described in detail based on the embodiments and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the content of the following claims.

10; Motor housing 11; Housing bottom
12; Housing opening 100; Stator core
110; Coil 111; Coil terminals
200; Insulation paper

Claims (5)

A stator core coupled to the cylindrical motor housing;
A plurality of coils wound inside the stator core; And
It includes; insulating paper disposed to surround the outside of the plurality of coils,
The insulating paper is bent in a 'c' shape, the stator of the EPS motor, characterized in that inserted into the lower surface of the stator core facing the bottom surface of the motor housing.
The method of claim 1, wherein the insulating paper,
The stator of the EPS motor surrounding the outside of the plurality of coils.
The method of claim 2,
The stator of the EPS motor, wherein the insulating paper is not disposed in the coil adjacent to the coil wrapped with the insulating paper.
The method of claim 1,
The folded portion of the insulating paper is in contact with the bottom surface of the motor housing stator of the EPS motor.
The method of claim 4, wherein
Both ends of the insulating paper are stator of the EPS motor toward the opening surface side of the motor housing.

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