Speed control scheme for BLDC drive with nonlinear fuzzy PID control based on DSP and FPGA

摘要

Because of its high performance, brushless DC motors are widely used in vehicles. But the brushless DC motor speed system itself is easily influenced by the parameter variation, the cogging torque and the load disturbance. And some complex algorithms to overcome the deficiency are difficult to implement on a single DSP chip. To solve the problem, the paper represents a nonlinear PID controller based on DSP and FPGA. A functional design of FPGA in a brushless DC motor system based on FPGA and DSP was completed by using modular design method. All the function modules are programmed by Very-High-Speed Integrated Circuit Hardware Description Language (VHDL). The simulation and experiment results indicate that nonlinear PID can improve the performances of the servo system in rapidity, control accuracy, adaptability and robustness.