JPH09201024A - Method for maintaining insulation of brush motor and brush motor - Google Patents

Abstract

(57) [Summary] [Problem] In a conventional motor with a brush, since the inner wall of the rear lid having the brush is not subjected to insulation treatment,
Noise generated from brush sparks was propagated to the coil side and the outside through the brush abrasion powder. SOLUTION: The brush motor according to the present invention is configured to reduce noise propagation due to brush sparks as compared with the conventional case by an insulating coating (11) applied to at least a portion of the rear lid (5) near the brush (6). It is a composition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of maintaining insulation of a brush motor and a brush motor, and more particularly, by applying an insulating coating to at least the inner wall of the rear lid, noise generated from sparks of the brush propagates to the outside. The present invention relates to a new improvement for preventing this.

[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, by applying an insulating coating to at least the inner wall of the rear lid, noise generated from the sparks of the brush is propagated to the outside. An object of the present invention is to provide a method for maintaining insulation of a brush motor and a brush motor that are prevented.

[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, a method of reducing the propagation of noise generated from sparks of the brush by an insulating coating provided on at least a portion of the rear lid near the brush.

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 in the casing having the stator magnet, and the brush provided in 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 is provided.

More specifically, the inner wall of the stator magnet is provided with the insulating coating.

[0009]

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.

On the inner wall of the rear lid 5, an insulating coating 11 formed of a well-known insulating paint is formed at least in the vicinity of the brush 6, and the insulating coating 11 is formed on the inner wall of the casing 1 and the stator magnet 1A. It is also formed on the surface of a fastening screw 12 for fastening the front lid 4 and the rear lid 5. 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 is applied, the insulating state is maintained, the powder layer is in an electrically floating state, and noise generated from brush sparks generated by the brush 6 and the commutator 8 propagates to the outside of the motor. Is also reduced, which can be significantly reduced 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.

[0011]

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. In other words, since at least the inner wall of the rear lid that holds the brush near the brush is coated with an insulating coating, noise propagation due to sparks generated from the brush can be reduced and the reliability of the brushed motor can be significantly improved. it can.

[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

Claims (3)

[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)
A method for maintaining insulation of a brushed motor, characterized in that an insulating coating (11) applied to a portion in the vicinity of (6) reduces propagation of noise generated from sparks of the brush (6). 2. A shaft (10) of a rotor (9) is mounted via bearings (2, 3) of a front lid (4) and a rear lid (5) provided in a casing (1) having a stator magnet (1A). A motor with a brush that is rotatably provided and is rectified by a brush (6) provided on the rear lid (5), having at least an insulating coating (11) provided on the inner wall of the rear lid (5). A motor with a brush. 3. The brushed motor according to claim 2, wherein the inner coating of the stator magnet (1A) is provided with the insulating coating (11).