Error Reduction in Sensorless Speed Control Technique for PMSM Drive using New Sliding Mode Reaching Law

This paper presents an error reduction in sensorless speed control technique for Permanent Magnet Synchronous Motor (PMSM) drive using New Sliding Mode Reaching Law (NSMRL). The control concept of the sliding surface function is included in the NSMRL, as well as the system state variable. The value of the switching function, in particular, binds the power term, allowing the reaching law to be expressed in different ways during the trying to reach methodology. Not only does this process actually suppress implicit chattering, but it also increases the speed of the system state trying to reach the sliding mode surface. A sliding mode control technique of PMSM is developed with reaching law. Thereafter an enhanced sliding mode controller using an anti-disturbance property, method called Sliding Mode Control Pulse Extended State Observer (SMC+ESO) method is developed, which considers the large chattering phenomenon due to high switching gain. The proposed algorithm not only suppress the chattering problem, but it also enhances the accuracy of estimation. The proposed sensorless control technique is validated over a small-scale experimental setup.