Research on BLDCM Speed Loop Control Based on Variable Speed index Approach Law NFTSM

Aiming at the problems of large speed overshoot and long response time in the control of brushless DC motors, a non-singular fast terminal sliding mode controller with variable speed index approach law was designed to control the speed of BLDCM. The stability of the controller is proved by Lyapunov function. With the help of Matlab/Simulink simulation software, the speed waveforms of the NFTSM controller with variable speed index approach law, NFTSM controller with traditional index approach law and PI controller are analyzed. The simulation results show that the NFTSM controller using the variable speed index approach law basically has no overshoot and has a short response time.