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Robust Model Predictive Direct Speed Control for SPMSM Drives Based on Full Parameter Disturbances and Load Observer

A robust model-predictive direct-speed control (MP-DSC) for the surface-mounted permanent-magnet synchronous motor (SPMSM) drives is proposed in this article. First, MP-DSC based on direct voltage-selection cost function is introduced. Then, a sliding-model full parameter disturbances and load observer (FPLO) that can simultaneously estimate electrical parameter disturbances, mechanical parameter disturbances, voltage reconstruction error, motor speed, and load torque is proposed. Thus, the load torque observer in the conventional MP-DSC method is eliminated. Then, the MP-DSC+FPLO method is presented, in which the output of the proposed FPLO is used to compensate for the predicted reference voltage error. The simulation and experimental results show that the proposed method is robust to the disturbance of parameters and load.