An Enhanced PID Controller for Speed Control of Brushless DC Motors Based on Convex Set Optimization

This paper presents an enhanced PID controller design method with an internal feedback PD controller. The proposed controller structure is organized as the convex set between PID controller and PI controller with an internal PD controller. Control parameters are determined through an optimum tuning method to improve the step response characteristics in the controllable set. The new PID structure and optimum tuning algorithm are applied to the speed control of brushless direct-current (BLDC) motors. Computer simulation results show that the proposed controller is more effective in the performance of time domain by comparing with the existence tuning rules of PID controller.