High temperature direct speed regulation technique for a vector controlled permanent magnet motor drive based on predictive control method

Abstract

This paper presents a constrained direct speed control (DSC) of a permanent magnet synchronous motor (PMSM) under high temperature conditions, based on model predictive control. Following the classical control theory, a nonlinear state-space model (SSM) of PMSM has been developed. A discretization of the SSM has been performed in order to achieve a digital prediction algorithm, suitable for implementation in a modern DSP. Model predictive approach has been used to a posteriori constraint introduction into the control system enabling future tracking error minimization. It overcomes disadvantages of motion control systems based on linear controllers, resulting in poor dynamic performance. The proposed constrained direct speed control architecture has been validated by simulated results compared to a linear PI controller with multiple control loops. The robustness of the controller introduced has also been investigated.