Mainly to play the role of electricity. The motor is mainly composed of a stator and a rotor. The direction of the force-carrying wire in the magnetic field is related to the direction of the current and the direction of the magnetic induction line (the direction of the magnetic field), and both the stator and the rotor need to be electrically conductive. The working principle of the motor is that the magnetic field acts on the current to force the motor to rotate. The carbon brush is in contact with the motor, and the motor rotates at a high speed, which will cause friction with the carbon brush, so the carbon brush is easily lost.
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