A sensorless control method considering performance constraints is proposed for the speedtracking control problem of synchronous reluctance motors(SynRM).Firstly

in order to be able to accurately observe the position information of the motor

a new sliding mode observer(SMO) is designed by combining the predefined performance function to constrain the stator current error.Secondly

considering the precise requirement of motor speed in actual industrial production

a SynRM speed tracking controller based on predefined performance control(PPC)and sliding mode control(SMC) is designed

improving the control accuracy of motor speed and improving dynamic performance of the system .Considering the presence of external disturbances

a disturbance observer that does not depend on the system acceleration is designed to compensate for the disturbances

further improving the system’s robustness.Finally

the simulation results show that the proposed control scheme performs excellently.