QIWEI motor accessories-what are the application characteristics of brushes?

The wide range of application and large quantity of motors have something to do with the development of society. The faster the speed of development, the more influence the role of these strange motors will be. With the improvement of the level of science and technology, we have also understood that the use of machinery and equipment for processing is not only a matter of supply, but also the benefits of manufacturers, so that manufacturers want to better development, the use of mechanical processing quality, manufacturers' reputation, trust. The foundation of the customer source is very important.

Then again, what are the characteristics of motor accessories and brushes?

1. Add an external current (excitation current) to a rotating rotor (input current) through a brush.

2. Introduce the electrostatic charge on the shaft into the earth (grounding brush) (output current) through the brush.

3. Change the direction of the current (in the commutator motor, the brush also plays a commutation role).

4. Lead the large shaft (ground) to the protection device for rotor grounding protection and measure the positive and negative voltage to the ground of the rotor.

The commutator is composed of an electric brush and a commutation ring, and the brush is a kind of carbon brush. Due to the rotation of the rotor, the brush always friction with the commutation ring, and will produce electric spark erosion at the moment of commutation, so the brush is a vulnerable part in the DC motor. In order to improve the service life and running stability of DC motor and reduce the noise and electromagnetic interference of DC motor, brushless DC motor has a tendency to gradually replace brushed motor.

Generally, AC motors do not need constant magnetic field, so they do not need commutators and brushes, but the volume of AC motors is generally large. The motors used in household appliances are generally AC motors, such as fans, washing machines, refrigerators, air conditioners, etc., but there are also DC motors, such as many electric razors, kitchen appliances, electric bicycles and so on. DC motors (excluding brushless ones) are available. The motors that use dry batteries are all DC motors.