Integral Sliding Mode Control of Sinusoidal Doubly Salient Electro-magnetic Motor Speed Regulation System Based on a Load Torque Observer

In order to enhance the speed regulation performance of sinusoidal doubly salient electro-magnetic motor (DSEM) drives, an integral sliding mode based on load torque sliding mode observer (LTSMO-ISM) speed controller is designed. This proposed LTSMO-ISM speed controller introduces the integral term of mechanical angular velocity error into the designed sliding mode surface to avoid the high frequency noise caused by the inherent differential action of the traditional sliding mode surface, which can enhance the dynamic and steady speed performance. A LTSMO is builded to observe motor load in real time, and the observation value is directly incorporated into the ISM controller, which can effectively suppress the speed fluctuation bringed by motor load step. The simulation results show that the proposed LTSMO-ISM speed controller is robust to load step and enhances the dynamic and steady performance of sinusoidal DSEM.