KR101792915B1

KR101792915B1 - Motor of direct cooling type for stator's coil

Info

Publication number: KR101792915B1
Application number: KR1020150152095A
Authority: KR
Inventors: 팽용석
Original assignee: 현대위아 주식회사
Priority date: 2015-10-30
Filing date: 2015-10-30
Publication date: 2017-11-02
Also published as: KR20170050495A

Abstract

The present invention relates to a stator coil direct cooling type motor, and more particularly, to a stator coil direct cooling type motor, which includes a motor housing and a stator disposed along the inner periphery of the motor housing and having a plurality of coils wound in a circumferential direction, And a cooling member disposed between the motor housing and the stator so as to cool the stator and the connected rotor and the stator. In accordance with the present invention, the cooling efficiency of the motor is improved by directly cooling the stator and stator coils .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a stator coil,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a motor, and more particularly, to a motor in which cooling efficiency of a motor is improved by directly cooling a stator and a stator coil using cooling water and a thermally conductive resin.

Generally, the motor may include a motor housing 31, a stator 30, a rotor 20, a shaft 24, and the like, as shown in Fig. A stator core (34) is disposed around the inner periphery of the motor housing (31). The coil 35 is wound on the stator core 34 a plurality of times and the coil 35 forms an electromagnetic field inside the motor housing 31 by supplying current.

A rotor 20 is disposed in a central portion of the stator 30 and a permanent magnet 21 is mounted on the rotor 20 to rotate the rotor 20 in response to an electromagnetic field. Accordingly, the shaft 24 coupled to the central portion of the rotor 20 rotates and the motor is driven. At this time, the motor housing 31 may be provided with a bearing 33 for smooth rotation of the shaft 24.

When an electric current is applied to the stator coil 35 and an electromagnetic field is formed, heat is generated due to iron loss of the stator core and coiling of the stator coil. The heat that is generated continuously for a long time between the operation of the motor shortens the life of the motor and makes the output of the motor unstable, so it is necessary to cool this generated heat.

In order to cool the heat generated in the stator coil 35, a cooling fluid path is mainly formed in the motor housing 31 so that the generated heat is absorbed by the refrigerant. 2, in one example of the conventional motor cooling structure, a cooling water inlet 141 and a plurality of cooling water guide projections 142 are formed at one end of the motor housing 31 in the circumferential direction, and the motor housing 31 And the cooling water outlet 130 is connected to the cooling water outlet 143. A plurality of radiating fins 120 are arranged in a circumferential direction in an inner space of the motor housing 31 in which the stator 30 and the rotor 20 are disposed.

When the cooling water flows in through the cooling water inlet 142, the cooling water flows in the direction of the cooling water 130 along the guide protrusion 142 in the motor housing 31. At this time, the cooling heat is transferred to the radiating fin 120 to cool the heat generated in the stator coil 35. And the U-turns are moved along the cooling water path 130 along the circumference of the motor housing 31 to cool the stator core 34 in the circumferential direction. And then discharged to the outside through the cooling water outlet 143.

The cooling structure implemented in the conventional motor housing 31 is not a direct cooling of the stator coil 35 but an indirect cooling of the cooling fins 120 using the inner surface heat conduction of the motor housing 31 and the air, There is a limit in effectively cooling the heat generated in the stator coil 35. [

Thus, there is a need in the art for a structure that can more directly cool the heat generated in the stator coils. Prior art relating to the cooling structure of the motor is shown in Korean Patent Publication No. 2014-0011449.

It is an object of the present invention to provide an apparatus for cooling the stator and stator coils directly to improve the cooling efficiency.

According to an aspect of the present invention, there is provided a motor for directly cooling a stator coil, comprising: a motor housing; a stator disposed along the inner periphery of the motor housing and having a plurality of coils wound in a circumferential direction; And a cooling member disposed between the motor housing and the stator for contact cooling the stator, and a cooling member disposed at a central portion of the stator, and connected to the shaft.

The cooling member includes a support block having a plurality of insertion holes and formed in a circumferential direction along an outer circumference of the stator, and a cooling channel coupled to the support block and disposed to axially surround the stator, And the like.

Further, the cooling member may further include an end cap mounted on both ends of the cooling passage, wherein the end cap is bent in a direction toward the center of the stator so as to cool both ends of the stator coil.

The cooling member may further include a heat conducting member molded and disposed in the stator and the cooling member to improve the cooling ability of the cooling member.

In addition, the insertion hole of the support block may be arranged to protrude along the circumferential direction of the support block so as to widen the contact area with the heat conduction member.

According to the present invention, the heat generated by the iron loss of the stator core during the operation of the motor and the stator coil caused by the current flowing through the stator coil, etc., is reduced compared with the conventional method in which the cooling passage is directly formed in the stator, It is possible to cool more effectively.

Both ends of the stator core are also cooled by turning both ends of the cooling channel to 90 DEG to face the center of the stator core, thereby improving the overall cooling efficiency.

Further, by molding a thermally conductive resin such as boron nitride powder, polyphenylene sulfide resin or the like on the entire outer side of the stator, not only the stator but also the coils wound on the stator can be directly cooled.

This ultimately prevents the heat loss due to heat generation in the stator and stator coils, thereby prolonging the life of the motor and stabilizing the motor output even in long-term use.

FIG. 1A is a side sectional view showing a cooling structure of a conventional motor. FIG.
FIG. 1B is a perspective view showing a housing cooling channel structure of the conventional motor shown in FIG. 1A; FIG.
2 is an assembled perspective view of the cooling channel of the present invention;
3 is a perspective view showing a state in which a thermally conductive resin of the present invention is molded.
4 is an assembled perspective view of the motor of the present invention.
5 is a side cross-sectional view of the motor of the present invention.
6A and 6B are cross-sectional views of the stator of the present invention.

Hereinafter, preferred embodiments of a stator coil direct cooling type motor according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view showing a state in which the thermoconductive resin of the present invention is molded, FIG. 4 is a perspective view of the motor assembly according to the present invention, FIG. 5 is a perspective view of the motor And Figs. 6A and 6B are cross-sectional views of the stator of the present invention. Fig.

2 to 5, an embodiment of a stator coil direct cooling type motor according to the present invention includes a motor housing 300, a stator 410, a rotor 500, a cooling member 700, and a heat conductive member 800 ). &Lt; / RTI >

4, the main body 370 in which the stator 410 is disposed may be provided in a cylindrical shape, and a power line 430 of the stator coil 420 may be provided on one side of the outer surface of the main body 370, The extension portion 320 can be formed. A power supply hole 310 to which the power supply line 430 of the stator coil 420 is connected may be mounted on the extension 320.

5, a shaft hole 360 through which the shaft 600 passes is formed at one end of the motor housing 300, and the housing cover 330 is coupled to the other end. A resolver 340 is mounted on the housing cover 330 and an end block 350 is coupled to the housing cover 330 on the resolver 340 to protect the resolver 340 .

Next, the stator 410 may be disposed along the inner circumference of the motor housing 300. Since the main body 370 of the motor housing 300 is provided in a cylindrical shape, the shape of the stator 410 may be circular in cross section, as shown in FIGS. 6A and 6B. A plurality of coil slots 411 are formed in the inside of the stator 410 so that a plurality of coils 420 are wound in a circumferential direction along the inner circumference of the stator 410.

The rotor 500 is disposed at the center of the stator 410 and the center of the rotor 500 is connected to the shaft 600. When the electromagnetic field is generated according to the power supply, the rotator 500 rotates by the interaction with the stator 410 to rotate the shaft 600. As shown in FIG. 4, the rotor 500 may be disposed at a central portion of the stator 410 to be rotatable, and may be provided in a cylindrical shape, and a plurality of coils may be wound around the outer periphery.

5, a bearing 610 may be mounted on the periphery of the shaft 600 in the motor housing 300 so that rotation of the shaft 600 is smooth.

Next, the cooling member 700 may be disposed between the motor housing 300 and the stator 410 to cool the stator 410 by contact. The cooling member 700 may include a support block 710, a cooling passage 730, and an end cap 740.

2, the support block 710 may be disposed in a circumferential direction along the outer circumference of the stator 410, and a plurality of insertion holes 720 may be formed in the support block 710 .

6A, the insertion hole 720 is disposed so as to protrude to the outside of the support block 710 and enlarges the contact area with the thermally conductive member 800, which is molded and arranged, Or may be arranged in the circumferential direction on the support block 710 as shown in FIG. 6B in another embodiment.

The cooling channel 730 is mounted on the insertion hole 720 of the support block 710 and is disposed around the stator 410 in the axial direction. That is, the cooling passage 730 extends in the axial direction of the entire outer surface of the stator 410 and cools the heat generated by the interaction with the rotor 500 across the stator 410, . Here, the support block 710 may be formed of a material having excellent thermal conductivity so that the refrigerant flowing through the cooling channel 730 can effectively remove heat.

The end cap 740 may be mounted on both ends of the cooling passage 730. The end cap 740 may be formed of a U-shaped pipe, and both end portions of the plurality of cooling channels 730 are connected to each other so that the cooling channels 730 are arranged in the circumferential direction And may be configured to cycle. That is, the cooling fluid introduced from the coolant inlet port 731 moves along the periphery of the stator 400 along the cooling channel 730 and the end cap 430, and is discharged again through the coolant outlet port 732 .

At this time, the end cap 740 may be bent in the direction of the center of the stator 410. This is to effectively remove heat generated at both ends of the stator coil 420 and the stator 410 through the coolant. Here, the angle of tilting is preferably about 90 DEG, but an angle within a range that can be designed by the ordinary artisan through the present invention can also be included.

Next, the heat conduction member 800 may be molded and disposed in the stator 410 and the cooling member 700 so that the cooling ability of the cooling member 700 is improved. The thermally conductive member 800 is in direct contact with the stator 410 and the stator coil 420 together with the cooling member 700 so that the cooling passage 730 and the end cap 740 to the stator 410 and the stator coil 420 to cool the generated heat.

Since the thermally conductive member 800 is wrapped around both ends of the stator 410 as well as around the stator 410, the heat generated from the stator coil 420 can be effectively cooled in all directions.

Referring to FIG. 5, a side view of the thermally conductive member 800 including the stator 410 and the stator coil 420 and covering the entire cooling member 700 can be seen.

The coolant flowing through the cooling passage 730 not only cools the stator coil 420 through the stator 410 but also the cooling heat is transmitted to the stator 410 and the stator 410 through the molded heat conductive member 800. [ And then transmitted to the stator coil 420 to cool the generated heat. The end cap 740 is bent toward the center of the stator 410 and the cooling heat is transmitted to the stator 410 and the stator coil 420 through the heat conductive member 800.

The thermally conductive member 800 may be formed of a thermally conductive resin. In the embodiment of the present invention, boron nitride powder, polyphenylene sulfide (PPS) resin, or the like can be used. They are characterized by high thermal conductivity, electrical insulation, low abrasion resistance during processing, and can be employed as the material of the heat conduction member 800.

According to the present invention, the heat generated by the stator coils at the periphery of the stator and at both ends thereof is effectively cooled, thereby improving the cooling efficiency of the motor.

300: motor housing 410: stator core
411: coil slot 420: stator coil
500: Rotor 600: Shaft
700: cooling member 710: support block
720: insertion hole 730: cooling flow path
740: end cap 800: heat conduction member

Claims

Motor housing;
A stator disposed along an inner periphery of the motor housing and having a plurality of coils wound in a circumferential direction;
A rotor disposed at a central portion of the stator and connected to the shaft;
A cooling member disposed between the motor housing and the stator for contact cooling the stator; And
And a heat conduction member molded and disposed in the stator and the cooling member so that the cooling ability of the cooling member is improved,
The cooling member
A support block having a plurality of insertion holes and formed in a circumferential direction along an outer circumference of the stator;
A cooling passage coupled to the support block and disposed to axially surround the stator; And
And an end cap attached to both end portions of the cooling passage and bent toward the center of the stator so as to cool both end portions of the stator coil,
The heat conduction member is disposed to surround a support block and a cooling channel disposed on the outer periphery of the stator so as to transmit heat generated from the stator in all directions,
Wherein the insertion hole of the support block is disposed at a portion protruding along the circumferential direction of the support block.

The method according to claim 1,
Wherein the material of the heat conduction member is boron nitride powder or polyphenylene sulfide resin.

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