Brushless DC motor consists of a motor body and a driver, and is a typical electromechanical integrated product. Brushless motor refers to a motor without brushes and commutators (or collector rings), also known as a commutatorless motor. As early as the 19th century, when the electric motor was born, the practical motor produced was the brushless form, namely the AC squirrel cage asynchronous motor, which has been widely used. However, asynchronous motors have many insurmountable defects, resulting in slow development of motor technology. In the mid-20th century, transistors were born, and thus the use of transistor commutation circuits instead of brushes and commutators in brushless DC motors emerged. This new type of brushless motor is called an electronically commutated DC motor, which overcomes the shortcomings of the first generation brushless motor.
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