Robust optimal speed tracking control of a current sensorless synchronous reluctance motor drive using a new sliding mode controller

This paper presents the robust optimal position control of a current sensorless synchronous reluctance motor (SynRM), which is specified by the specific speed profiles. The proposed control scheme is a combination of the conventional linear quadratic (LQ) control method and sliding mode control. A new type of sliding surface is employed first that makes the states of the SynRM to follow its nominal trajectory controlled by any type of nominal controller. The different torque control schemes related to SynRM are examined below and above the base speed. Then, the current sensors are eliminated and the simulated currents are used for current control. Finally A digital simulation study is carried out to demonstrate the effectiveness of the proposed control strategy.