Design of speed sliding mode control system for BLDC

With the wide use of Brushless DC Motor (BLDCM) in industry, traffic and home applications, higher requirements are put forward for the performance and stability of its control system. Although the traditional PID control method is simple and easy to use, it may not perform well in the face of nonlinear and time-varying BLDCM systems, especially in the face of external disturbances and parameter uncertainties. In order to improve the control effect of BLDMC system, this paper devotes itself to designing an advanced speed control system, which adopts sliding mode control as the main control strategy. SMC can effectively suppress uncertainties and external disturbances by introducing sliding mode surface, thus improving the robustness and dynamic performance of the system. However, the traditional sliding mode control will bring bad jitter phenomenon because of high frequency switching. In order to reduce the occurrence of jitter, this topic adopts the integral sliding mode method for motor speed control to ensure the accuracy and reliability of brushless DC motor control.