KR200168795Y1 - Brush holder structure of motor - Google Patents

Abstract

The present invention relates to a brush holder structure of a motor for a cleaner, wherein a plurality of cooling vents are provided in a brush holder fixed to a horizontal line on an upper housing, and the rear surface of the brush holder maintains an air gap of a carbon brush with respect to a commutator. The support spring, which can be used as a cooling vent to be connected to the lead wires at the same time as the compression spring is interposed, can effectively release frictional heat and current heat generated by friction between the commutator and the carbon brush as well as the carbon brush. Deformation can be prevented in advance, and in particular, the air gap of the carbon brush can be kept constant to extend the life of the motor.

Description

Brush holder structure of the cleaner motor

The present invention relates to a brush holder structure of a motor for a cleaner, and more particularly, a brush of a motor for a cleaner that prevents deformation of a carbon brush by effectively releasing heat generated by friction with a commutator when the motor is operated. It relates to a holder structure.

In general, a motor applied to a home appliance is fixed to have an air gap with a predetermined gap with respect to a rotor rotated by a magnetic force generated from a stator in which an armature coil is wound, and a commutator and a commutator located thereon. It is driven by a carbon brush to change it.

Such a motor is protected by a rotor and a commutator by a housing made of aluminum by die casting. At this time, the housing acts as a source of vibration and noise during operation of the motor, so that the elastic modulus (stiffness) of the housing is sufficiently taken into consideration so as to reduce vibration and noise, and the heat generated during operation of the motor is appropriately cooled to operate the motor. This should be prevented from changing.

FIG. 1 is a view illustrating a motor applied to a conventional cleaner, in which a rotor coil 12 rotatably inserted into a stator core 10 and a stator core 10 on which an armature coil 10a is wound. ) Is a press-fit rotor (not shown) and a commutator 14 located thereon, and a pair of carbon brushes installed at right angles to the commutator 14 to change the current direction ( 16 and the upper and lower housings 18 and 20 fixed to both sides of the stator core 10 to protect and support the rotor and the commutator 14.

The upper housing 18 has a bearing portion 18a protruding in the center to accommodate a bearing (not shown) interposed on the rotor shaft 12, and the upper housing 18 cools the motor in an air-cooled manner. A plurality of vent holes 18b are provided, and both ends thereof are bent so that the fixing portion 18c having a through hole formed therethrough so that the tie bolts 24 pass therethrough is directed outward.

The pair of carbon brushes 16 are spaced apart from each other on the horizontal line (180 °) on the outer periphery of the upper housing 18 to have an air gap (void) of a predetermined gap with respect to the commutator 14 as shown in FIGS. 2A and 2B. It is inserted into the brush holder 26 fixed to be disposed, the cover 28 is integrally mounted on the rear surface of the brush holder 26, the carbon brush 16 and the cover 28 by changing the direction of the current to the commutator One end of the lead wire 30 connected to the armature coil 10 to generate magnetic flux at 14 is connected by welding, respectively.

In addition, a compression spring 32 including a lead wire 30 is inserted between the carbon brush 16 and the cover 28 so as to maintain a constant air gap of the carbon brush 16 with respect to the commutator 14. The upper, lower, and both sides of the holder 26 are provided with various types of cooling vents 26a and vertical holes 26b for releasing frictional heat and current heat generated from the commutator 14 and the carbon brush 16 to the outside. do.

In the conventional cleaner motor configured as described above, when a current is applied to the slot of the stator core 10 and the armature coil 10a wound in the slot, the effective magnetic flux direction generated from the armature coil 10a is perpendicular to the direction of the effective magnetic flux. Direction, the rotor rotates by an electromagnetic force applied according to Fleming's left hand law.

At this time, the commutator 14 press-fitted to the rotor shaft 12 changes the current position of the commutator 14 and the carbon brush 16 when the rotor is rotated to a right angle position. That is, when the commutator 16 is rotated by 90 ° with respect to the pair of carbon brushes 16 fixed on the horizontal line to the upper housing 18, the carbon is connected through the lead wire 30 connected to the armature coil 10a. The rotor is continuously rotated by the magnetic field generated by changing the direction of the current applied to the brush 16.

Thereafter, as the rotor rotates according to the above principle, an impeller (not shown) coupled with the other end of the rotor shaft 12 rotates at a high speed and sucks foreign substances such as external air and dust.

In addition, frictional heat generated from the commutator 14 and the carbon brush 16 during operation of the motor is discharged to the outside through the plurality of ventilation holes 18b provided in the upper housing 18. At this time, the friction heat and the current heat generated by the friction of the commutator 14 and the carbon brush 16 inserted into the brush holder 26 to have a fine air gap therebetween are applied to the upper, lower and both sides of the brush holder 26. The air is discharged to the outside through various types of cooling vents 26a and vertical holes 26b.

However, since the size of the cooling vents provided in various shapes in the brush holder is small as described above, the carbon brushes rubbed with the commutator are easily bent or expanded due to overheating as the amount of frictional heat and current heat generated from the carbon brush is small. There was a problem causing deformation.

In addition, there is a problem in that the compression spring inserted between the carbon brush and the cover is not able to maintain a constant air gap for the commutator as it is caught in the vertical hole provided in the brush holder.

The present invention is to solve the above problems, the object of the present invention is to improve the structure of the pair of brush holders fixed to the upper housing and to provide a large cooling vent on the upper, lower and one side thereof In addition, it is possible to more effectively release the frictional heat and the current heat generated by the friction between the commutator and the carbon brush, as well as to prevent the deformation of the carbon brush in advance, and in particular, to maintain a constant air gap of the carbon brush. It is to provide a brush holder structure of the motor.

1 is a perspective view schematically showing a conventional cleaner motor,

FIG. 2A is a perspective view of the brush holder fixed to the housing of the motor shown in FIG. 1,

Figure 2b is a cross-sectional view of the brush holder shown in Figure 2a,

Figure 3a is a partially separated perspective view showing the brush holder structure of the cleaner motor according to the present invention,

3B is a cross-sectional view of the brush holder shown in FIG. 3A;

Figure 4 is a perspective view showing a state in which the brush holder according to the present invention is fixed to the motor.

* Description of the symbols for the main parts of the drawings *

50: carbon brush 52: brush holder

52a, 52b: cooling vent 52c: opening

54, 56: first and second support 58: compression spring

Features of the present invention for achieving the above object, a rotor and a commutator located on the upper portion of the stator core is rotatably inserted, both sides of the stator core for supporting and supporting the rotor and commutator In the brush holder structure of the motor provided to insert the carbon brush is fixed to the lower load housing, the horizontally fixed to the upper housing and disposed at a right angle to the commutator, wherein the carbon brush is inserted into the upper housing The brush holder is fixed, the brush holder is provided with a plurality of cooling vents, the brush holder rear surface is bent support portion for connecting the lead wires while interposing a compression spring to maintain the air gap of the carbon brush Is achieved by.

Cooling vent according to a preferred embodiment of the present invention is provided on the upper, lower and one side of the brush holder is achieved by releasing the heat of friction and current generated from the commutator and the carbon brush to the outside.

The support part according to a preferred embodiment of the present invention is achieved by being a first support part in which one side of the brush holder is bent inwardly and a second support part recessed inward with respect to the first support part to connect the lead wires by welding. do.

Hereinafter, a preferred embodiment of the brush holder structure of the cleaner motor according to the present invention will be described in detail with reference to the accompanying drawings.

3A and 3B are views illustrating a brush holder structure according to the present invention, and upper and lower portions for protecting and supporting the rotor and the commutator 14 on both sides of the stator core 10 on which the armature coil 10a is wound. The housings 18 and 20 are fixed, and a pair of brush holders 52 which are spaced horizontally on the outer circumference of the upper housing 18 are fixed, and the commutator 14 is fixed in the brush holder 52. A carbon brush 50 having an air gap with respect to is inserted.

Cooling vents 52a and 52b having a relatively large size to discharge frictional heat and current heat generated by friction between the commutator 14 and the carbon brush 50 to the outside on the brush holder 52. ) Are provided, and a support part is formed on the rear surface of the brush holder 52. The support portion is bent the first support portion 54, one side of which is opened in the inward direction, the other side is recessed the second support portion 56 to connect the lead wire 30 by soldering.

One end of the lead wire 30 is connected to the amateur coil 10a and the other end is connected to the carbon brush 50, and is supported by the first and second support parts 54 and 56 in the brush holder 52. While the carbon brush 50 is inserted into the compression spring 58 to maintain a constant air gap with respect to the commutator (14).

Here, the support formed on the rear surface of the brush holder 52 may be formed in an open shape to be used as a cooling vent. That is, the conventional cover mounted on the rear surface can be used as another cooling vent to eliminate the cover, thereby further increasing the cooling effect.

The operation of the brush holder structure of the cleaner motor according to the present invention configured as described above will be described in detail with reference to FIG. 4.

When a current is applied to the armature coil 10a wound on the stator core 10, the rotor shaft 12 is inserted into the effective magnetic flux direction perpendicular to the magnetic field generated from the armature coil 10a. Rotate with That is, when the rotor rotates at 90 °, the rotor continuously rotates as the current applied to the armature coil 10a is rotated at right angles to the commutator 14 with respect to the carbon brush 50. .

Thereafter, the impeller coupled to the other end of the rotor shaft 12 rotates as the rotor rotates at a high speed, and sucks foreign substances such as external air and dust. At this time, the friction heat and the current heat generated by the friction of the commutator 14 and the carbon brush 50 during the operation of the motor is a brush having a plurality of ventilation holes 18a and the carbon brush 50 is provided in the upper housing 18 Since the cooling vents 52a and 52b are provided on the upper and lower surfaces of the holder 52, and the openings 52c which are utilized as the cooling vents on the rear surface of the brush holder 52, carbon is discharged. The brush 50 can be cooled quickly, thereby preventing deformation of the carbon brush.

In addition, as the compression spring 58 interposed in the brush holder 52 is supported by the first and second support portions 54 and 56 without changing the elastic force, the air gap of the carbon brush 50 is constantly supported. You can do it.

According to the brush holder structure of the cleaner motor according to the present invention as described above, by improving the structure of the pair of brush holder fixed to the upper housing and providing a large cooling vent on the upper, lower and one side thereof It can more effectively release frictional heat and electric current generated by friction between commutator and carbon brush, and can prevent the deformation of carbon brush accordingly. Especially, air gap of carbon brush is kept constant so that the life of motor can be maintained. Can be extended.

The present invention is not limited to the above-described specific preferred embodiments, and any person having ordinary skill in the art to which the present invention pertains may make various modifications without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

Claims (4)

A rotor and a commutator positioned at an upper portion thereof are rotatably inserted in the stator core, and upper and lower load housings for fixing and supporting the rotor and the commutator are fixed to both sides of the stator core. In the brush holder structure of the motor provided to insert the carbon brush is fixed to the right angle with respect to the commutator disposed in, A brush holder into which the carbon brush is inserted is fixed to the upper housing, a plurality of cooling vents are provided on the brush holder, and a compression spring for maintaining an air gap of the carbon brush is interposed on the brush holder rear surface. Brush holder structure of the motor for a cleaner, characterized in that the support for bending the lead wire is bent. The brush holder of claim 1, wherein the cooling vent is provided on one side and one side of the brush holder to release frictional heat and current heat generated from the commutator and the carbon brush to the outside. rescue, The method of claim 1, wherein the support portion is characterized in that the first support portion is bent inwardly in one side of the brush holder and the second support portion which is recessed inward with respect to the first support portion to connect the lead wires by welding. Brush holder structure of the cleaner motor. The brush holder structure of claim 1 or 3, wherein the support part is formed to have an open rear surface to be used as a cooling vent.