BLDC motor, comparing to traditional brush DC motor, adopts electronic control to switch current direction, replacing mechanical carbon brush. Accordingly its structure has not carbon brush for switching current direction. thereby this kind of electronic control eliminates mechanical abrasion, lower noise, reduce vibration, reduce fever, and doesn't bring spark. The performance of BLDC motor is safer and more reliable. It has longer life time and is easy to maintain. It is more efficient to save power. Extensive applications of BLDC motor is industry development trend, and has contributed to the development of saving power and protecting environment.