Study on sensorless brushless DC motor control system

Based on the analysis of position sensor brushless DC motor commutation and counter electromotive force starting on the basis of principle,the commutation module is established by a counter electromotive force,athree stepsstart technology is started.In the double-loop speed control system,a current loop current hysteresis control and PID controller speed ring are used.Simulation results show that the counter electromotive force on the commutation of brushless DC motor position sensor control system can do to the normal starting,a position sensor with a brushless DC motor control system equally has good static and dynamic characteristics.