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Brushless DC motor control structure

Date:2018-03-31 Author: Click:

A brushless DC motor is a type of synchronous motor, which means that the speed of the rotor of the motor is affected by the speed of the rotor's rotating magnetic field and the number of rotor poles (P): N = 120.f / P. With a fixed number of rotor poles, Changing the frequency of the rotating magnetic field of the stator can change the rotational speed of the rotor. The brushless DC motor is the synchronous motor plus electronic control (driver) to control the frequency of the rotating magnetic field of the stator and feedback the speed of the rotor of the motor to the control center for repeated calibration, so as to achieve the characteristics close to the characteristics of the DC motor. In other words, the DC brushless motor can control the motor rotor to maintain a certain speed when the load changes within the rated load range. The brushless DC drive includes the power supply unit and the control unit. (1): The power supply unit supplies three-phase power to the motor, and the control unit switches the input power supply frequency as required.



When the number of rotor poles is fixed, changing the frequency of the rotating magnetic field of the stator can change the rotation speed of the rotor. The brushless DC motor is the synchronous motor plus electronic control (driver) to control the frequency of the rotating magnetic field of the stator and feedback the speed of the rotor of the motor to the control center for repeated calibration, so as to achieve the characteristics close to the characteristics of the DC motor. In other words, the DC brushless motor can control the motor rotor to maintain a certain speed when the load changes within the rated load range.


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