Second order sliding mode control of synchronous reluctance motor drives with maximized efficiency

In this paper the electromagnetic torque and the square of the stator flux magnitude control using second order sliding mode controller (2-SMC) of a synchronous reluctance motor (SynRM), is proposed. In order to warranty the stator flux and electromagnetic torque to track its reference signal exactingly, the electromagnetic torque sliding mode variable and stator flux sliding mode variable were selected separately. Designed super twisting controller permits to decrease chattering that is inherent in first order sliding mode control and to improve accuracy. Also the upper band of parameters uncertainties, are calculated to serve the stability of the total system. Also, an online adaptive loss minimization controller (ALMC) for SynRM drives is introduced. The ALMC provides a novel pattern of change in stator flux magnitude to reach a minimum motor input power at any operating state. The effectiveness of the designed control scheme is confirmed via simulation.