The brushless DC motor is composed by motor body and drive system, and is a typical mechatronic product. Brushless motor refers to the motor without brush and commutator (or slip ring), also known as the motor without commutator. As early as when the motor was born in the 19th century, the practical motor produced was a brushless form, that is, an AC squirrel cage asynchronous motor. This motor has been widely used. However, asynchronous motors have many insurmountable shortcomings, so that the development of motor technology is slow. The transistor was born in the middle of the last century, so the brushless DC motor that uses a transistor commutation circuit instead of brushes and commutators came into being. This new type of brushless motor is called an electronically commutated DC motor, which overcomes the shortcomings of the first generation of brushless motors. 

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