The working principle of brushless DC motor (BLDC motor) is based on electromagnetic induction and electronic control. It consists of a fixed magnet (called permanent magnet) and a rotatable coil (called rotor). The coil on the rotor generates a magnetic field through current, while the permanent magnet generates a constant magnetic field.
The control of BLDC motors is done by electronic devices, usually using an electronic controller or driver. The electronic controller controls the direction and magnitude of the current based on information fed back by sensors, such as rotor position and speed.
The working process of BLDC motor can be divided into three stages: excitation, driving and braking.
During the excitation phase, the electronic controller determines which coil needs to be activated based on the feedback information of the rotor position. It activates the corresponding coil by giving the current direction and magnitude to generate a magnetic field.
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