SENSORLESS VECTOR CONTROL OF PERMANENT MAGNET SYNCHRONUS MACHINE

Abstract

The main of this project is to implement different sensorless techniques for sensorless vector control of PMSM. A modified SMO based sensorless control is presented, which improves the performance of motor. Further, the performance is improved with MARS based sensorless technique. SMO are known for their robust nature against the parameter variation and disturbance due to which they are preferred choice in sensorless control. Conventionally SMO is used with signum function but chattering is a major problem in sliding mode . In this project, SMO is used with saturation function to mitigate the effect of chattering. But the presence of lpf deteriotes the dynamic performance of SMO as it introduces the time delay in the system. Hence, a modified SMO is designed with back emf observer. Further, the performance is improved with a MARS based sensorless technique . The sliding mode controller is used as adaptive law to improve the performance.