A synchronous reluctance motor driven by an integral variable structure grey controller for current sensorless is presented. We adopt a maximum torque control strategy. The integral variable structure controller is used to reject the uncertain bounded disturbances and parameter variations. The grey prediction can reduce the high frequency chattering phenomenon or eliminate steady state error due to use the boundary layer. The voltage reference equation generates the require voltage from the torque command and the motor speed. Simulation results show that the proposed controller has a fast response and a good disturbance rejection capability.
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