Abstract
The Permanent Magnet Synchronous Motor (PMSM) are emerging as one of the most important categories of AC machine drives. Therefore, different control methods are used for speed control of PMSM. In this paper, sliding mode and Extended state observer (ESO) are used to improve the speed control of the PMSM drive system. A sliding mode controller is employed in the outer speed control loop for tracking the speed of PMSM. Load torque disturbance is estimated using ESO. Performance evaluation of the sliding mode controller with ESO is compared with the conventional speed controller using PI. Better speed tracking accuracy is obtained for sliding mode controller than conventional PI controller
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