Combined Speed and Current Model Predictive Control with Inherent Field Weakening Features for PMSM Drives

The paper deals with the model predictive control (MPC) algorithm applied to control a permanent magnet synchronous motor, which is, at present, among the motors with the highest power efficiency and then very attractive for energy-saving applications. Absolute novelty of the proposed MPC is its feature of inherently managing the flux weakening control above base speed. Speed and current controller are combined together, including all the state variables of the system, instead of keeping the conventional cascade structure. In this way it is possible to enforce in the controller the current and voltage limits. Simulation and experimental results point out the validity of the design procedure and the powerful capabilities of the MPC in the electrical drives field.