JPH09201025A - Method for maintaining insulation of brush motor and brush motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the propagation of noise produced when the brush of a brush motor sparks to the outside of the motor by coating at least the part of the read lid of the casing of the motor near the brush with an insulating material and respectively providing insulating collars between a commutator and a rotor which slide on the brush and bearings. SOLUTION: At least the part of the internal surface of the rear lid 5 of the casing 1 of a brush motor near a brush 6 is coated with widely known insulating paint 11 and the insulating coating 11 is formed on the internal surfaces of the casing 1 and a stator magnet 1A and on the surfaces of screws 12 coupling the front and rear lids 4 and 5 of the casing 1 with each other. In addition, insulating collars 30 and 31 and an insulating plate 13 are also provided. When a rotor 9 is rotated, therefore, worn particles are scattered around from the brush 6 and form a particle layer, but the propagation of noise caused by the sparking of the brush 6 when a commutator 8 slides on the brush 6 to the outside of the motor can be prevented, because an insulating state is secured by the coating 11, insulating plate 13, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for maintaining insulation of a motor with a brush and a motor with a brush. The present invention relates to a new improvement for preventing the noise generated from the outside from propagating to the outside.

[0002]

2. Description of the Related Art As a brush motor of this type which has been conventionally used, the structure shown in FIG. 2 is generally adopted. That is, what is denoted by reference numeral 1 in FIG. 2 is a cylindrical casing as a yoke having a stator magnet 1A, and the first bearing 2 is provided at both ends of this casing 1.
And a front lid 4 and a rear lid 5 having the second bearing 3, and the rear lid 5 is provided with a brush holder 7 having a brush 6. The tip of the brush 6 is in sliding contact with a commutator 8, and the commutator 8 is integrally provided on a shaft 10 having a rotor 9 rotatably provided on the bearings 2 and 3.

Therefore, when current is supplied to the commutator 8 through the brush 6 to rotate the rotor 9 in the above-described structure, the brush 6 is scraped by the commutator 8 and the brush abrasion powder is scattered.

[0004]

Since the conventional brushed motor is constructed as described above, there have been the following problems. That is, the brush abrasion powder scattered from the brush adheres to the inner wall of the rear lid, the stator, and the commutator 8, so that the noise generated from the brush sparks generated from the brush propagates to the outside through the brush abrasion powder and causes an obstacle. It was.

The present invention has been made to solve the above problems, and in particular, it is generated from a spark of a brush by providing an insulating coating on at least the inner wall of the rear lid and providing insulating collars on both sides of the commutator. It is an object of the present invention to provide a method of maintaining insulation of a brush motor and a brush motor, which prevent the noise generated from propagating to the outside.

[0006]

According to the method of maintaining insulation of a brush motor according to the present invention, a rotor shaft is rotatably provided through bearings of a front lid and a rear lid provided in a casing having a stator magnet, and In a brushed motor configured to perform rectification by a brush provided on a lid, an insulating coating provided on at least a portion of the rear lid in the vicinity of the brush, and a commutator slidingly contacting the brush, and provided between the rotor and the bearing. This is a method of reducing the propagation of noise generated from the sparks of the brush by using an insulating collar.

More specifically, it is a method of using the insulating coating formed on the outer circumference of a fastening screw for fastening the front lid and the rear lid.

In the brush motor according to the present invention, the rotor shaft is rotatably provided through the bearings of the front lid and the rear lid provided on the casing having the stator magnet, and the brush provided on the rear lid is used for rectification. In the brushed motor described above, at least the insulating coating provided on the inner wall of the rear lid, and the insulating collar provided between the commutator slidably contacting the brush and provided on the shaft and the rotor and the bearing are provided. It is a composition.

More specifically, an insulating plate is provided on the commutator side of the bearing, and the insulating coating is formed on the outer periphery of a fastening screw for fastening the front lid and the rear lid. is there.

More specifically, a speed reducer is connected to the front lid.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a brush motor insulation maintaining method and a brush motor according to the present invention will be described in detail below with reference to the drawings. The same or equivalent parts as those in the conventional example will be described with the same reference numerals. FIG.
In FIG. 1, reference numeral 1 indicates a stator magnet 1
A cylindrical casing as a yoke having A, a casing 1 having a front lid 4 and a rear lid 5 having a first bearing 2 and a second bearing 3, and a brush on the rear lid 5. 6
Is provided with a brush holder 7. The tip of the brush 6 is in sliding contact with a commutator 8, and the commutator 8 is integrally provided on a shaft 10 having a rotor 9 rotatably provided on the bearings 2 and 3.

An insulating coating 11 formed of a known insulating paint is formed on at least a portion near the brush 6 on the inner wall of the rear lid 5, and the insulating coating 11 covers the inner wall of the casing 1 and the stator magnet 1A. It is also formed on the inner wall and the surface of the fastening screw 12 for fastening the front lid 4 and the rear lid 5. Also,
Insulating collars 30 and 31 are provided on the shaft 10 between the commutator 8 and the bearing 3 and the rotor 9, and a ring-shaped insulating plate 13 is provided on the commutator 8 side of the second bearing 3.
Further, a bolt 40 is used for the front lid 4 to reduce the speed of the speed reducer 50.
Is directly connected. Therefore, when a drive signal is applied to the rotor 9 via the brush 6 and the commutator 8 to rotate the rotor 9, brush abrasion powder is scattered from the brush 6 to the surroundings. Since the insulating coating 11 and the insulating plate 13 are applied, the insulating state is maintained, and the powder layer becomes electrically floating,
Propagation of noise generated from brush sparks generated by the brush 6 and the commutator 8 to the outside of the motor is also reduced,
It can be reduced significantly compared to the conventional configuration. It is still more effective to form the insulating coating 11 not only in the vicinity of the brush 6 but also in other areas.

[0013]

Since the method for maintaining insulation of the brush motor and the brush motor according to the present invention are configured as described above, the following effects can be obtained. That is, at least the inner wall of the rear lid that holds the brush near the brush is provided with an insulating coating, and the motor is provided with an insulating coating and an insulating plate, so that noise propagation due to sparks generated from the brush is reduced, The reliability of the attached motor can be significantly improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a brush motor according to the present invention.

FIG. 2 is a sectional view showing a conventional brushed motor.

[Explanation of symbols]

 1 Casing 1A Stator magnet 2,3 Bearing 4 Front lid 5 Rear lid 6 Brush 9 Rotor 10 Shaft 11 Insulation coating 12 Fastening screw 13 Insulation plate 30,31 Insulation collar 50 Reduction gear

Claims (5)

[Claims] A shaft (10) of a rotor (9) is mounted on a casing (1) having a stator magnet (1A) via bearings (2, 3) of a front lid (4) and a rear lid (5). In a motor with a brush that is rotatably provided and is rectified by a brush (6) provided on the rear lid (5), at least the brush of the rear lid (5)
Insulation coating (11) applied to the vicinity of (6), and
The commutator (8) in sliding contact with the brush (6) and the rotor
By the insulating collar (30, 31) provided between (9) and the bearing (3),
A method for maintaining insulation of a brushed motor, characterized in that propagation of noise generated from sparks of the brush (6) is reduced. 2. The brush according to claim 1, wherein the insulating coating (11) formed on the outer circumference of a fastening screw (12) for fastening the front lid (4) and the rear lid (5) is used. For maintaining insulation of a motor with a switch. 3. A shaft (10) of a rotor (9) is mounted on a casing (1) having a stator magnet (1A) through bearings (2, 3) of a front lid (4) and a rear lid (5). In a motor with a brush that is rotatably provided and is rectified by a brush (6) provided on the rear lid (5), at least an insulating coating (11) provided on the inner wall of the rear lid (5), The commutator (8) provided on the shaft (10) in sliding contact with the brush (6) and the rotor (9)
A motor with a brush, comprising: an insulating collar (30, 31) provided between the bearing and the bearing (2, 3). 4. An insulating plate (13) is provided on the side of the commutator (8) of the bearing (3), and a fastening screw (12) for fastening the front cover (4) and the rear cover (5). 4. The motor with brush according to claim 3, wherein the insulating coating (11) is formed on the outer circumference of (1). 5. The brushed motor according to claim 3, wherein a speed reducer (50) is connected to the front lid (4).