Speed control system of brushless DC motor based on fuzzy adaptivePID control

CAI Hongping, WU Lebin, XV Fang

(Key Laboratory of E&M, Ministy of Education & Zhejiang Province, Zhejiang University
of Technology, Hangzhou, 310014, China)

Abstract: Aiming at the problem of low control precision and poor control effect of the brushless DC motor speed control with the routine PID control, a speed control system of the brushless DC motor was designed with STM8S based on fuzzy adaptivePID control. According to the working principle of the brushless DC motor, three Holzer sensors were used to check the position signal of the rotor and the position signal was turned into the electrical signal. The duty ration of the PWM was changed to control the power MOSFET by using the fuzzy adaptivePID control. The speed control system of the brushless DC motor was simulated with the routine PID control or the fuzzy adaptivePID control in Matlab/Simulink. In addition, the hardware circuit of the system and the software realization method were designed, and experiments were done. The results indicate that the overshoot of system is smaller and the conrtol effect is better with the fuzzy adaptivePID control.It works stable and reliably, responses fast and has low cost. The system can satisfy the use requirements.

Key words: STM8S; brushless DC motor; fuzzy adaptivePID control