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Commutator the brush and commutator rings, carbon brush is a brush. So what is the main brushless DC motor in it? 1. Change the current direction (in motor commutator, the brush also plays a role reversal) 2. The electrostatic charge large shaft into the earth through carbon brushes (grounding brushes) (output current) 3. Shaft (ground) lead to a protection device for rotor ground protection and measuring rotor positive and negative voltage to ground 4. The external current (excitation current) through the brushes and added to the rotation of the rotor (input current) Due to the rotation of the rotor, the brushes were always changing the friction ring, and in an instant commutation will spark ignition eclipse, so brushless DC motor in the consumables. In order to improve the life of the operation and stability of DC motor reduces noise and electromagnetic interference DC motor, brushless DC motor gradually replace the brush motor trend. Usually AC motors do not have a constant magnetic field, so no need to commutator, brush it without; but the volume of AC motors larger than normal. Electrical household appliances are generally used AC motors, such as electric fans, washing machines, refrigerators, air conditioners and so did not brush, but also the use of a DC motor, as many electric shavers, small kitchen appliances, electric bicycles have carbon Brush is a DC motor (not including brushless) has. Use dry motors are DC motors. |
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The role of the commutator brushes for DC motors
Source： Time：2015-04-22 14:27:03 views：
1. Change the current direction (in motor commutator, the brush also plays a role reversal)
2. The electrostatic charge large shaft into the earth through carbon brushes (grounding brushes) (output current)