Survey of EKF based sensorless vector control methodologies for a permanent magnet synchronous motor

In the recent past, the use of permanent magnet synchronous motors (PMSM) has increased due to the numerous advantages they offer. The accurate performance and precise speed and/or position control of a PMS motor requires precise information about the rotor shaft position and angular speed in order to synchronize the phase excitation pulses to the rotor position. In order to achieve the speed control various sensored methods are employed. Due to number of advantages, recent trend is to implement the sensorless drive for a PMSM. This paper presents the survey conducted in studying and understanding various methodologies of EKF based sensorless algorithms for the vector control drive of a PMSM.