An improved sensorless control for linear flux switching permanent magnet (LFSPM) motor is proposed in this paper. Due to the end effect, the 3-phase inductance of LFSPM motors are unbalanced, which leads to an obvious reduction of observation accuracy of mover position and speed. To solve this problem, an improved phase-locked loop is proposed, in which a notch filter is connected in series in front of the PI controller. This method can greatly improve the performance of sensorless control for LFSPM motor applications.

Linear flux switching permanent magnet (LFSPM) motor， unbalanced inductance， notch filter (NF)， sensorless control