无刷电动机是一种用电子换向取代机械换向的新一代电动机，与传统的直流电动机相比，其具有过载能力强，低电压特性好，启动电流小等优点，同时由于采用了电子换向取代了机械换向，使电动机的使用寿命得到很大的提高，所以近年来在工业运用方面大有取代传统直流电动机的趋势，研究无刷直流电动机的驱动控制技术具有重要的实际应用价值。(Brushless motor is a kind of electronic commutation instead of a new generation of mechanical commutation motor. Compared with the traditional DC motor, which has strong overload capacity, low voltage characteristics, starting current, etc., also the electronic commutation is used to replace the mechanical commutation, the service life of the motor has been greatly improved, so in recent years in industrial utilization is the trend to replace the traditional DC motor, the no brush DC motor drive and control technology has important practical application value.)