JPH08182259A - Rotary commutator of motor - Google Patents

Abstract

PURPOSE: To prevent the abrasion of the commutator of a motor, etc., and make its long time operation possible. CONSTITUTION: A disk-like rotary commutator 6 is provided on a slip ring 5 of a commutator motor, and the rotary commutator 6 is rotated in the same direction and at the same peripheral speed as that of the slip ring 5, by gears 7 and 8 provided respectively on the shaft of a rotor 2 and the shaft of the rotary commutator 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is small in an electric motor,
High output, high efficiency, high-speed rotation, and easy rotation control. DC commutator motors, etc. are freed from abrasion of brushes such as motors with commutators, enabling stable operation for a long time. The present invention relates to a rotary commutator.

[0002]

2. Description of the Related Art In a conventional commutator such as an electric motor, a slip ring (commutator) is provided on a shaft portion of a rotor (rotor), and a brush (brush) is brought into pressure contact with the slip ring.
A brush, a slip ring, a coil, a slip ring, and a brush are used to apply an electric current.

[0003]

When the electric motor or the like is operated, if the slip ring and the brush are not in sufficient contact with each other, an arc is generated, resulting in poor current flow. The brush must be pressed against and brought into contact with the cylindrical surface of the slip ring, and the brush must be rotated to create a state in which good energization is performed. Although there are various brush materials, a brush made of Guraheit carbon, which has excellent conductivity and lubricity, is used. Since the carbon brush is brought into pressure contact with the surface of the rotating slip ring, it is severely worn and is generally considered as a consumable item. If the brush is made of a material with low wear, the slip ring will wear and the rotor will become unusable.

Compared to induction motors, DC commutator motors offer high output and high rotation in a smaller volume, and their rotation control is easy, so they are widely used for large and small household appliances, automobiles, toys, etc. However, especially small motors suffer from severe brush wear and have a short durability time, and generally, a commutator motor using a small carbon brush has a durability time of about 1000 hours.

A brushless motor in which a commutator is semiconductor-controlled has to perform complicated electric control, is expensive to manufacture, and is not suitable for manufacturing a large capacity. For the above reasons, a commutator such as an electric motor that can be cut off for a long time is desired.

[0006]

In order to achieve the above object, the rotary commutator of the present invention is a disk-shaped rotating body instead of the conventional square rod-shaped carbon brush, and a shaft portion is provided at the center thereof. Support both ends with bearings, and set a gear at one end of the shaft.
The rotary commutator of the pair of rotary brushes rotates in the same direction by gears provided on the shaft of the rotor. Gears are arranged so that the outer peripheral speed of the slip ring and the outer peripheral speed of the rotating brush of the rotary commutator are almost the same, and the outer periphery of the slip ring and the rotating brush are crimped, but no slip occurs between them. .

When the slip ring and the rotating brush are at the same speed, only crimping is required, and surface cleaning is required for long-term use. It is better to provide a difference in outer peripheral speed between the slip ring and the rotating brush so that the surface of the rotating brush and the rotating brush have no self-cleaning effect, as long as the rotating brush does not wear.

[0008]

[Operation] The outer peripheral speed of the slip ring and the outer peripheral speed of the rotating brush of the rotary commutator rotate in the same direction at almost the same speed, and both are crimped, but there is almost no slip between them, so they rotate. Does not abrade the contact surface of the brush.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to the drawings. In FIGS. 1 and 2, a rotor 2 is rotated by a rotor shaft 4 held by bearings 3 in a stator 1 of a commutator motor. A bearing 10 in which a rotary commutator 6 is pressed against a slip ring 5 of a rotor 2 by a pressure spring 11
It is pressurized by the shaft 9 of the rotary commutator which rotates in the.
Grawite carbon is mainly used for the rotary disk of the rotary commutator. On the other hand, a gear 7 fixed to the shaft 4 of the rotor 2
Mesh with a pair of gears 8 mounted on the shaft 9 of the rotary commutator. Since the diameters and the number of teeth of the gears 7 and 8 are almost the same, when the rotor 2 rotates, the surface of the slip ring 5 of the rotor and the rotary commutator 6 rotate in close contact with each other in the same direction. .

[0010]

Since the present invention is configured as described above, it has the following effects.

By using the rotary commutator of the present invention, the brush is not pressed against the rotating slip ring unlike the conventional brush and slip ring, and the rotary commutator and the slip ring are crimped at substantially the same peripheral speed. While rotating, they do not wear or damage each other. Therefore, the life of the small commutator motor is very short and the durability time is 10
Although it is said to be around 00 hours, it is possible to dramatically extend the life by using the rotary commutator of the present invention.

Further, since the structure is relatively simple and the number of parts is small, it can be installed in a small space, so that it can be sufficiently housed in the casing of a conventional commutator motor, resulting in a large cost increase. Is not a factor.

Among the commutator motors, the present invention has a great effect on the improvement of the present situation in which a small number of motors are used especially in a small number and the service life is short.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an electric motor provided with a rotary commutator.

FIG. 2 is a cross-sectional view of an electric motor provided with a rotary commutator.

FIG. 3 is a perspective view of a conventional commutator.

FIG. 4 is a perspective view of a rotary commutator.

[Explanation of symbols]

 1 stator 2 rotor 3 shaft receiver 4 shaft 5 slip ring 6 rotary commutator 7 rotor gear 8 rotary commutator gear 9 shaft 10 shaft receiver 11 pressure spring

Claims (1)

[Claims] 1. A disc-shaped rotary commutator (6) is crimped to a slip ring (5) of a rotor (2) of an electric motor or the like and rotated by a gear (7) fixed to a shaft (4) of the rotor. A rotary commutator in which a rotary commutator (6) and a slip ring (5) rotate in the same direction at the same peripheral speed via a gear (8) fixed to the shaft of the commutator.