Model Predictive Direct Speed Control Based on Synergy of Electromagnetic and Mechanical Time Constant

To enhance the control performance of a PMSM, this study introduces an novel model predictive direct speed control approach that takes into account varying time constants. The developed strategy employs a single-loop control structure to concurrently regulate motor speed and current, eliminating predictive performance disruptions resulting from disparities between electromagnetic and mechanical time constants. Initially, this study discretizes the motor's mathematical model using distinct sampling intervals and employs the trapezoidal method to prevent multi-step predictions within the mechanical time domain. Subsequently, a thorough analysis is conducted to examine the interconnections among variables in both the electrical and mechanical time domains. To streamline the predictive process, which typically involves extensive calculations, the deadbeat principle and a linear model are utilized. In experimental comparisons with the traditional strategy, the proposed approach effectively enhances the performance of the motor.