WO2013024965A1

WO2013024965A1 - Stator assembly having bolt clamp

Info

Publication number: WO2013024965A1
Application number: PCT/KR2012/004554
Authority: WO
Inventors: Jeong Cheol Jang; Ji Min Lee; Gyeong Sik Yang
Original assignee: New Motech Co.,Ltd.
Priority date: 2011-08-16
Filing date: 2012-06-08
Publication date: 2013-02-21
Also published as: KR20130019064A; KR101294546B1

Abstract

Disclosed therein is a stator assembly, which includes a stator core; an upper insulator joined to an upper portion of the stator core and having at least one upper protrusion protruding inwardly; a lower insulator joined to a lower portion of the stator core and having at least one lower protrusion protruding inwardly; and a bolt clamp including an upper retaining plate seated on the upper protrusion, a lower retaining plate seated on the lower protrusion, and a support plate for connecting the upper retaining plate and the lower retaining plate with each other, wherein the upper retaining plate and the lower retaining plate respectively have a first hole and a second hole for inserting a bolt thereinto.

Description

STATOR ASSEMBLY HAVING BOLT CLAMP

The present invention relates to a stator assembly of a motor, and more particularly, to a stator assembly of a motor, which can prevent a damage of an insulator joined to a stator because the stator is assembled to a motor set using a bolt clamp.

In general, a motor used in a washing machine includes a stator assembly serving as a stator. The stator assembly is assembled to a motor set, and a structure of a stator assembly according to a prior art is illustrated in FIGS. 1 and 2.

As shown in FIGS. 1 and 2, the stator assembly according to the prior art includes an upper insulator 210 and a lower insulator 220 respectively joined to upper and lower portions of a core 240. Moreover, the upper insulator has at least one upper joining bushing 215 formed inside the upper insulator and the lower insulator has at least one lower joining bushing 225 formed inside the lower insulator. Such a stator assembly is joined to the motor set when rivets are forcedly pressed into the upper and lower joining

bushings

215 and 225 and bolts are joined to the rivets.

However, the stator assembly according to the prior art has a problem in that the joining bushings may be broken or damaged when the rivets are forcedly pressed into the joining bushings because the joining bushings are made of plastic resin. Moreover, the stator assembly according to the prior art has another problem in that it requires lots of resin molding expensive manufacturing when the upper and lower insulators are manufactured because the joining bushings are made by resin molding.

Accordingly, in order to solve the above problems, the inventors of the present invention propose a stator assembly of a new structure, which can join the stator assembly and the motor set with each other in a different method from the conventional method.

Accordingly, the present invention has been made in an effort to solve the above-mentioned problems occurring in the prior arts, and it is an object of the present invention to provide a stator assembly of a new structure, in which can join the stator assembly and a motor set with each other using a bolt clamp.

It is another object of the present invention to provide a stator assembly, which can prevent a damage of insulators because rivets are not forcedly pressed into joining bushings of the insulators.

It is a further object of the present invention to provide a stator assembly, which can reduce an amount of used resin molding material.

The foregoing and other objects of the present invention will be achieved and apparent from the following description, the appending claims and the accompanying drawings.

To achieve the above objects, the present invention provides a stator assembly including: a stator core; an upper insulator joined to an upper portion of the stator core and having at least one upper protrusion protruding inwardly; a lower insulator joined to a lower portion of the stator core and having at least one lower protrusion protruding inwardly; and a bolt clamp including an upper retaining plate seated on the upper protrusion, a lower retaining plate seated on the lower protrusion, and a support plate for connecting the upper retaining plate and the lower retaining plate with each other, wherein the upper retaining plate and the lower retaining plate respectively have a first hole and a second hole for inserting a bolt thereinto.

An upper retaining hole for inserting the upper retaining plate thereinto is formed at a portion where the upper protrusion of the upper insulator is formed, and a lower retaining hole for inserting the lower retaining plate thereinto is formed at a portion where the lower protrusion of the lower insulator is formed.

The support plate includes an upper support plate and a lower support plate, and an U-shaped support part is formed between the upper support plate and the lower support plate. The U-shaped support part includes: an upper plate connected to the upper support plate; a lower plate connected to the lower support plate; and a vertical plate for connecting the upper plate and the lower plate with each other, and wherein the upper plate and the lower plate respectively have third and fourth holes for inserting the bolt thereinto.

The support plate includes a member having a hole formed at the central portion thereof for inserting the bolt thereinto.

The member is located between the upper protrusion and the lower protrusion.

The lower retaining plate is extended to be longer than the upper retaining plate and has a fixing protrusion formed at the extended portion of the lower retaining plate, and the fixing protrusion is inserted into a lower fixing hole formed in the lower retaining hole of the lower insulator.

The bolt clamp for the stator assembly according to the present invention includes: an upper retaining plate seated on an upper protrusion formed on an upper insulator of a stator core; a lower retaining plate seated on a lower protrusion formed on a lower insulator of the stator core; and a support plate for connecting the upper retaining plate and the lower retaining plate with each other, wherein the upper retaining plate and the lower retaining plate respectively have first and second holes for inserting a bolt thereinto.

The stator assembly according to the present invention can prevent a damage of the joining bushing and reduce an amount of resin molding to thereby reduce manufacturing costs because the joining bushing, which is joined with a motor set, is not made by resin molding together with the insulators but is joined with the motor set using the bolt clamp.

FIG. 1 is a perspective view of a stator assembly according to a prior art.

FIG. 2 is a perspective view of the stator assembly taken along the 'A-A' part of FIG. 1.

FIG. 3 is a perspective view of a stator assembly according to the present invention.

FIG. 4 is a perspective view of a bolt clamp according to the present invention.

FIG. 5 is a partially enlarged perspective view of a 'B' part of FIG. 3.

FIG. 6 is a sectional view taken along the line of 'C-C' part of FIG. 5.

Description will now be made in detail of preferred embodiment of the present invention with reference to the attached drawings.

As shown in FIG. 3, the stator assembly 100 according to the present invention includes: an upper insulator 110 and a lower insulator 120 respectively joined to upper and lower portions of a core; and at least one bolt clamp 130 joined inside the upper and

lower insulators

110 and 120. For convenience in description, the core positioned between the upper insulator 110 and the lower insulator 120 is not illustrated in FIG. 3.

The upper insulator 110 and the lower insulator 120 are joined with each other in a state where they have a space therebetween. Moreover, the upper insulator 110 and the lower insulator 120 respectively have an upper protrusion 111 and a lower protrusion 121, which protrude a little inward and are respectively formed at portions of the upper and

lower insulators

110 and 120 where the bolt clamp 130 is joined. FIG. 3 illustrates three bolt clamps 130, but the number of the bolt clamps is not restricted to the above but may be changed according to needs. In order to describe a structure that the bolt clamps 130 are joined to the upper insulator 110 and the lower insulator 120, first, a structure of the bolt clamps 130 will be described.

As shown in FIG. 4, the bolt clamp 130 used in the stator assembly 100 according to the present invention includes an upper retaining plate 131, a lower retaining plate 132, and an U-shaped support part 133. The U-shaped support part 133 is connected to the upper retaining plate 131 by an upper support plate 134 and is connected to the lower retaining plate 132 by a lower support plate 135.

The upper retaining plate 131 is joined to an upper retaining hole 112 of the upper insulator 110 in a state where the upper retaining plate 131 is placed on the upper protrusion 111 of the upper insulator 110. The U-shaped support part 133 has a shape that an upper plate 133a, a lower plate 133b and a vertical plate 133c are connected in a U shape. The upper plate 133a is connected with the upper retaining plate 131 by the upper support plate 134, and the lower plate 133b is connected with the lower retaining plate 132 by the lower support plate 135.

The lower retaining plate 132 is located on a lower retaining hole 122 in a state where the lower retaining plate 132 is located on the lower protrusion inwardly protruding from the lower insulator 120. Compared with the upper retaining plate 131, the lower retaining plate 132 may extend more in an outward direction of the insulator, and a fixing protrusion 137 may be formed at the extended portion. The fixing protrusion 137 is joined to a lower fixing hole 123, which is formed in the lower protrusion 121 of the lower insulator 120. When the fixing protrusion 137 is joined to the lower fixing hole 123, a joining force between the bolt clamp 130 and the upper and lower insulators is increased and it can prevent that the bolt clamp is separated from an original position.

Because the bolt clamp 130 is a subsidiary part for fixing the stator assembly to a motor set, in order to penetrate a bolt (not shown) through the bolt clamp 130, a first hole 136a is formed in the upper retaining plate 131, a second hole 136b is formed in the lower retaining plate 132, and a third hole 136b and a fourth hole 136c are respectively formed in the upper plate 133a and the lower plate 133b, and the bolt passes through the first to fourth holes and is joined and fixed to the motor set.

The structure that the bolt clamp 130 having the above structure is joined to the upper and

lower insulators

110 and 120 will be described referring to FIGS. 5 and 6.

FIG. 5 is a partially enlarged perspective view of a 'B' part of FIG. 3, which shows a part of the stator assembly according to the present invention, and FIG. 6 is a sectional view taken along the line of 'C-C' part of FIG. 5.

As shown in FIGS. 5 and 6, the upper retaining plate 131 and the upper plate 133a of the U-shaped support part 133 are connected by the upper support plate 134, and in this instance, the upper protrusion 111 of the upper insulator 110 is located on the upper retaining hole 112 formed in the upper insulator having the upper retaining plate 131 in a state where the upper protrusion 111 is forced pressed between the upper retaining plate 131 and the upper plate 133a. In the same way, the lower protrusion 121 of the lower insulator 120 is located on the lower retaining hole 122 formed in the lower insulator having the lower retaining plate 132 in a state where the lower protrusion 121 is forced pressed between the lower retaining plate 132 and the lower plate 133b.

The upper plate 133a and the lower plate 133b of the U-shaped support part 133 is located in a space between the upper insulator 110 and the lower insulator 120 to thereby serve to fix the upper insulator 110 and the lower insulator 120.

In another embodiment of the present invention, in the case that the upper insulator and the lower insulator are joined together in such a fashion that there is no space between the upper insulator and the lower insulator, the bolt clamp 130 may have a structure that the U-shaped support part 133 is omitted. That is, the upper retaining plate 131 and the lower retaining plate 132 form one support plate by connection of the upper support plate 134 and the lower support plate 135, so that the bolt clamp may generally have an U shape.

In a further embodiment of the present invention, the U-shaped support part 133 may be replaced with another member. In other words, another member substituting for the U-shaped support part, for instance, a cubic member having a hole formed at the central portion thereof for allowing the bolt to penetrate, may be attached to the central portion of the bolt clamp having the same structure as the above embodiment.

While the present invention has been particularly shown and described with reference to exemplary embodiment thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention described in claims.

100: stator assembly110: upper insulator

111 upper protrusion112: upper retaining hole

120: lower insulator121: lower protrusion

122: lower retaining hole123: lower fixing hole

130: bolt clamp131: upper retaining plate

132: lower retaining plate

133: U-shaped support part133a: upper plate

133b: lower plate133c: vertical plate

134: upper support plate135: lower support plate

136: hole137: fixing protrusion

200: stator assembly210: upper insulator

215: upper joining bushing220: lower insulator

225: lower joining bushing230: rivet

240: core250: coil

Claims

A stator assembly comprising:

a stator core;

an upper insulator joined to an upper portion of the stator core and having at least one upper protrusion protruding inwardly;

a lower insulator joined to a lower portion of the stator core and having at least one lower protrusion protruding inwardly; and

a bolt clamp including an upper retaining plate seated on the upper protrusion, a lower retaining plate seated on the lower protrusion, and a support plate for connecting the upper retaining plate and the lower retaining plate with each other,

wherein the upper retaining plate and the lower retaining plate respectively have a first hole and a second hole for inserting a bolt thereinto.
The stator assembly according to claim 1, wherein an upper retaining hole for inserting the upper retaining plate thereinto is formed at a portion where the upper protrusion of the upper insulator is formed, and a lower retaining hole for inserting the lower retaining plate thereinto is formed at a portion where the lower protrusion of the lower insulator is formed.
The stator assembly according to claim 1, wherein the support plate comprises an upper support plate and a lower support plate, and an U-shaped support part is formed between the upper support plate and the lower support plate, the U-shaped support part comprising:

an upper plate connected to the upper support plate;

a lower plate connected to the lower support plate; and

a vertical plate for connecting the upper plate and the lower plate with each other, and

wherein the upper plate and the lower plate respectively have third and fourth holes for inserting the bolt thereinto.
The stator assembly according to claim 1, wherein the support plate comprises a member having a hole formed at the central portion thereof for inserting the bolt thereinto.
The stator assembly according to claim 4, wherein the member is located between the upper protrusion and the lower protrusion.
The stator assembly according to claim 2, wherein the lower retaining plate is extended to be longer than the upper retaining plate and has a fixing protrusion formed at the extended portion of the lower retaining plate, and the fixing protrusion is inserted into a lower fixing hole formed in the lower retaining hole of the lower insulator.
A bolt clamp comprising:

an upper retaining plate seated on an upper protrusion formed on an upper insulator of a stator core;

a lower retaining plate seated on a lower protrusion formed on a lower insulator of the stator core; and

a support plate for connecting the upper retaining plate and the lower retaining plate with each other,

wherein the upper retaining plate and the lower retaining plate respectively have first and second holes for inserting a bolt thereinto.
The bolt clamp according to claim 7, wherein the support plate comprises an upper support plate and a lower support plate, and an U-shaped support part is formed between the upper support plate and the lower support plate, the U-shaped support part comprising:

an upper plate connected to the upper support plate;

a lower plate connected to the lower support plate; and

a vertical plate for connecting the upper plate and the lower plate with each other, and

wherein the upper plate and the lower plate respectively have third and fourth holes for inserting the bolt thereinto.
The bolt clamp according to claim 8, wherein the support plate comprises a member having a hole formed at the central portion thereof for inserting the bolt thereinto, and the member is located between the upper protrusion and the lower protrusion.