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What is a brushless motor and a brushed motor?

2023-12-11 17:37

One: knowledge of brush motor
Brushed motors include a brush device that converts electrical energy into mechanical energy, or mechanical energy into electrical energy. Brush motor is the basis of all motors, with the advantages of fast start, timely braking, smooth speed regulation in a large range, and relatively simple control circuit.
A brushed motor is mainly composed of a stator and a rotor. There are magnetic poles (windings or permanent magnets) on the stator and windings on the rotor. After electricity is added, a magnetic field (magnetic pole) will also be generated on the rotor. Under the action of the motor, the motor rotates. By changing the position of the brush, the angle of the stator and rotor magnetic poles can be changed (assuming that the direction of the rotor magnetic poles toward the stator magnetic poles is the direction of rotation of the motor), and the direction of rotation of the motor can be changed.
In particular, it should be noted that the brush motor is powered by direct current, so it is generally called brush motor and "DC motor".

Two: knowledge of brushless motor
The brushless motor is composed of a motor body and a driver. Since the brushless motor runs in an automatic control mode, there is no need to use a variable frequency speed regulation mode to add a starting winding to the rotor to the heavy-duty starter motor, and it will not oscillate due to sudden changes in the load. Or out of step.
Brushless motors use semiconductor switching devices to achieve electronic commutation, that is, electronic switching devices instead of traditional contact commutators and brushes. The brushless motor consists of a permanent magnet rotor, a multi-pole winding stator, and a position sensor. The position sensor commutates the stator winding current in a certain order according to the change of the rotor position (that is, detects the position of the rotor magnetic pole relative to the stator winding, generates a position detection signal, and the power switch circuit is controlled by the signal conversion circuit, and the winding current is in accordance with a certain Logic relationship switching). An electronic switching circuit controlled by the position sensor output provides the operating voltage of the stator winding.

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