Discrete-time Sliding Mode Control of PMSMs for a Household Appliance

This paper proposes a discrete-time sliding mode control (DTSMC) approach for controlling a permanent-magnet synchronous motor (PMSM). To ensure precise speed tracking, a cascade control strategy is introduced. The stability of the proposed control scheme is analyzed, and a formal proof of the ultimate boundedness of the speed tracking error is provided. The developed control methodology yields superior control performance and robustness characteristics relative to the industry-standard PI cascaded control employed by Whirlpool in domestic appliances. Experimental testing of the control scheme was also conducted using a commercial PMSM drive.