Various techniques of sensorless speed control of PMSM: A review

In this paper various technique are describe for sensorless speed control of permanent magnet synchronous motor (PMSM). For low and medium power range PMSM play important role in motion control application in industry. Such application needs position and speed controllers with high accuracy, fast dynamical response and efficiency in the design process and implementation. In this paper various sensorless control techniques are reviewed and recent developments in this area are introduced with their inherent advantage and drawbacks.