What are the application characteristics of electric brushes?

The wide range of applications of the motor, the number of, with the development of society now has a relationship, the faster the pace of development, the role of these strange for the motor the more impact, the level of science and technology, but also let us understand a reason, the use of mechanical equipment processing, not only the supply of the amount of problems, but also the benefits of manufacturers, so that manufacturers want to better development, the use of mechanical processing quality, the manufacturer’s reputation, trust, the basis of customer sources All very important ah.

Back to the motor parts, what are the characteristics of the brush?

1. The external current (excitation current) through the brush and added to the rotor rotation (input current)

2. Introduce the electrostatic charge on the shaft through the brush to the earth (grounded brush) (output current)

3. Change the direction of the current (in rectifier motors, the brushes also play the role of commutation)

4. lead the large shaft (ground) to the protection device for rotor ground protection and measurement of positive and negative rotor voltage to ground

Commutator consists of brushes and commutation ring, brushes are a kind of carbon brush. Due to the rotation of the rotor, the brushes are always rubbing with the commutation ring, and in the moment of commutation, there will be electric spark scorching, so the brushes are the wearing parts of the DC motor. In order to improve the service life of DC motors, operating stability and reduce the noise and electromagnetic interference of DC motors, brushless DC motors have a trend to gradually replace brushed motors.

Generally, AC motors do not use constant magnetic field, so there is no need for commutator and brush; however, the volume of AC motors is generally larger. The motors used in household appliances are generally AC motors, such as fans, washing machines, refrigerators, air conditioners, etc. There are no brushes, but there are also DC motors, such as many electric shavers, small kitchen appliances, electric bicycles, etc. have brushes, that is, DC motors (not including brushless) are available. Motors that use dry batteries are DC motors.

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