Abstract: In view of the low precision and poor interference ability of the traditional PID control method,a parameter adaptive fuzzy PID integrated control strategy based on sensorless brushless DC motor (SLBLDCM) control system using back EMF zero crossing detection is proposed for a simpler system structure and faster torque response speed.The fuzzy adaptive PID control is applied to SLBLDCM control system.We establish a mathematical model of the brushless DC motor,and use the Fuzzy Toolbox and Simulink of Matlab to design the fuzzy adaptive double closed loop control system.Simulation results show that the control system runs smoothly with quick and accurate speed tracking,high control accuracy and good robustness.

Key words: brushless DC motor;sensorless;fuzzy adaptive PID