Can DC brushless motors be speed regulated? What are the speed regulation methods

With the rapid development of the motor industry, the application of brushless DC motor is becoming more and more widespread. It has the advantages of both DC motor speed control performance and AC motor with simple structure, less maintenance, no commutation spark, etc., which is loved by the majority of customers.

DC brushless motor mainly converts electrical energy into mechanical energy, or mechanical energy into electrical energy, speed control is the key, often need speed regulation, so what are the common ways to regulate speed?

1. Change the resistance of the speed control circuit

Various DC brushless motors can be speed regulated according to the change of armature circuit resistance. When the load is constant, as the series external resistance increases, the total resistance of the armature circuit increases and the speed of the motor decreases. Changing the external resistance can be achieved by contactor or main switch conversion.

2. Changing the voltage of the speed control circuit

Continuously changing the operating voltage of the brushless motor power supply system can make the brushless DC brushless motor achieve a wide range of stepless speed change. There are two ways to change the working voltage of brushless motor power supply system, one is the speed control system of generator-generator set power supply system and the other is the speed control system of thyristor variable current power supply system.

3. Changing the current of speed regulation circuit

When the operating voltage of brushless motor is constant, the speed can be changed even if the current of DC brushless motor is changed.

Mastering the speed regulation of DC brushless motors will benefit the future application of the product. In addition, mastering more professional knowledge about the motor will let us give full play to the motor in the middle and later applications.

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