US-12627203-B2 - Varnish impregnation device of stator coil winding

US12627203B2US 12627203 B2US12627203 B2US 12627203B2US-12627203-B2

Abstract

A varnish impregnation device including: a lower housing in which a stator is seated in an internal space thereof, the stator including a stator core which has a plurality of teeth protruding inward or outward and has a slot that is a space between the teeth. A coil winding passes through the slot and is wound around the teeth. A second cover member is coupled to an upper outer portion of the stator core. The lower housing has a plurality of varnish supply holes which is formed to pass up and down through a lower surface thereof, and the plurality of varnish supply holes communicates with the slot.

Inventors

Min Hwan Kim
Sung Moon KANG
Young Ki Kim
CHAN HO BAEK

Assignees

HANON SYSTEMS
B.M.C CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20240126
Priority Date: 20230428

Claims (9)

1 . A varnish impregnation device of a stator coil winding, the varnish impregnation device comprising: a lower housing in which a stator is seated in an internal space thereof, the stator including a stator core which has a plurality of teeth protruding inward or outward and has a slot that is a space between the teeth; an upper insulator and a lower insulator are respectively coupled to an upper portion and a lower portion of the stator core; and a coil winding that passes through the slot and is wound around the teeth; a lower sealing portion which is coupled to a lower portion of an inner space of the stator seated in the internal space of the lower housing; a central sealing portion which is positioned over the lower sealing portion; an upper sealing portion which is positioned over the central sealing portion; a first cover member which is coupled to an upper portion of the upper sealing portion and an inner upper portion of the upper insulator; and a second cover member which is coupled to an upper outer portion of the stator core and an outer circumference of the upper insulator at a predetermined distance from a circumference of the first cover member, wherein the lower housing has a plurality of varnish supply holes which are formed to pass up and down through a lower surface thereof, and the plurality of varnish supply holes communicates with the slot, wherein the coil winding is positioned in the slot and a varnish is supplied from a lower portion of the plurality of varnish supply holes and the varnish supplied moves upward through the slot and impregnates an upper portion of the coil winding.
2 . The varnish impregnation device of the stator coil winding of claim 1 , wherein a packing member is installed between an upper portion of the central sealing portion and a lower portion of the upper sealing portion and seals an upper portion of an inner space of the stator core, thereby preventing the varnish from flowing into the upper portion of the inner space of the stator core.
3 . The varnish impregnation device of the stator coil winding of claim 1 , wherein a packing member is installed between a lower portion of the central sealing portion and an upper portion of the lower sealing portion and seals a lower portion of an inner space of the stator core, thereby preventing the varnish from flowing into the lower portion of the inner space of the stator core.
4 . The varnish impregnation device of the stator coil winding of claim 1 , wherein a pair of fixed supports is formed to protrude upward from an outer wall of the lower housing, wherein a fastening portion is coupled to the fixed supports by a hinge and the fastening portion is rotatably coupled by the hinge, and wherein a bent portion formed to be bent at a top of the fastening portion fastens and compresses the first cover member and the second cover member.
5 . The varnish impregnation device of the stator coil winding of claim 1 , further comprising a supporting member which is installed on a bottom surface of the internal space of the lower housing and is installed on a lower inner diameter portion of the lower insulator of the stator.
6 . The varnish impregnation device of the stator coil winding of claim 5 , wherein a packing member is installed between the lower inner diameter portion of the lower insulator and the supporting member and prevents the varnish from flowing into an inside of the lower insulator.
7 . The varnish impregnation device of the stator coil winding of claim 1 , wherein a packing member is installed on an outermost peripheral portion of a bottom surface of the internal space of the lower housing and seals a lower outer diameter portion of the lower insulator, thereby preventing the varnish from flowing into the lower outer diameter portion of the lower insulator.
8 . The varnish impregnation device of the stator coil winding of claim 1 , wherein a packing member is installed on a circumference of a bottom surface of the first cover member and seals an upper inner diameter portion of the upper insulator, thereby preventing the varnish from flowing from an upper portion of the stator into an inner surface of the stator.
9 . The varnish impregnation device of the stator coil winding of claim 1 , wherein a packing member is installed on a bottom surface of the second cover member and seals an upper outer diameter portion of the upper insulator, thereby preventing the varnish from flowing from an upper portion of the stator into an outer surface of the stator.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application claims the benefit of and priority to South Korean Patent Application No. 10-2023-0056075, filed Apr. 28, 2023, the entire contents of which are incorporated herein for all purposes by reference. FIELD The present disclosure relates to a varnish impregnation device of a stator coil winding, and more particularly to a new structured varnish impregnation device which applies, by means of vacuum impregnation, varnish on a coil winding included in a stator of a motor such that the varnish is applied only on necessary portions of a material to be impregnated, thereby improving the quality and production efficiency of a product. BACKGROUND Generally, a stator of a motor includes a stator core, upper and lower insulators coupled to the top and bottom of the stator core, and a coil winding wound on teeth. The coil winding is wound on the teeth and is located in a slot that is a space between the teeth. Such a motor is applied in various fields such as home appliances, automobiles, and robots, etc. In particular, in a motor that is used in humid environments, such as a compressor of a refrigerator or an air conditioner, a fluid such as moisture, etc., may come into contact with the coil winding. Therefore, unless the surface of the coil winding is not insulated, the coil winding may be short-circuited due to moisture, etc. This may cause the motor to fail or to be fired. Accordingly, in order to prevent product defects due to the low insulation resistance of the coil winding, it is necessary to obtain an insulation resistance above a certain level on the surface of the coil winding. As a method for obtaining the insulation resistance, there is a method of forming a varnish film on the surface of the coil winding by impregnating the stator into varnish. As a prior art for the above method, Japanese Patent Application Laid-open No. S60-77650 discloses a method of applying varnish to a coil winding by impregnating a stator, which is a material to be impregnated, into a varnish impregnating liquid. Japanese Patent Application Laid-open No. Hei 06-36954 discloses a method of applying varnish to a coil winding by dropping the varnish from the top while transferring electrical parts such as a stator through a conveyor. However, in these prior arts, the varnish is applied by impregnating the stator into the varnish impregnating liquid or by dropping the varnish from the top of the stator, so that the varnish liquid remains on the inner and outer surfaces of the stator, etc., other than the coil winding. Therefore, in order to improve the quality and performance of the motor, the varnish remaining on the inner and outer surfaces of the stator must be removed to obtain the inner and outer diameter dimensions of the stator core. Furthermore, since a separate process must be performed to remove the varnish remaining on the inner and outer surfaces of the stator, a motor manufacturing process for increasing the insulation resistance in the coil winding is complicated, resulting in a decrease in productivity and an increase in the manufacturing cost of the motor assembly. Also, it is difficult to completely remove the varnish remaining on the inner and outer surfaces of the stator, which may lead to a decrease in motor quality and an increase in defect rate. Accordingly, in order to solve the above-mentioned problems, the present disclosure proposes a new structured varnish impregnation device that supplies the varnish to the coil winding and performs vacuum impregnation. SUMMARY The purpose of the present disclosure is to provide a new structured varnish impregnation device capable of increasing the insulation resistance of the coil winding by applying the varnish only on the coil winding portion other than the inner and outer surfaces of the stator. The purpose of the present disclosure is to provide a new structured varnish impregnation device capable of improving productivity and of reducing the manufacturing cost. All of the above-mentioned purposes and other inherent purposes can be easily achieved by the following embodiments of the present disclosure. One embodiment is a varnish impregnation device including: a lower housing in which a stator is seated in an internal space thereof, the stator including a stator core which has a plurality of teeth protruding inward or outward and has a slot that is a space between the teeth; upper and lower insulators respectively coupled to upper and lower portions of the stator core; and a coil winding that passes through the slot and is wound around the teeth; a lower sealing portion which is coupled to a lower portion of an inner space of the stator seated in the internal space of the lower housing; a central sealing portion which is positioned over the lower sealing portion; an upper sealing portion which is positioned over the central sealing portion; a first cover member which is coupled to an upper portion of the upper