Torque ripple control in faulty surface permanent magnet synchronous motor

This paper presents a torque ripple control approach which can be applied to a surface permanent magnet synchronous motor in a faulty case. The fault considered is an asymmetry created by unbalance number of turns in the three phases of the motor stator winding. Proposed control strategy provides the current reference in order to decrease the motor torque ripple. This torque control has been implemented using a model of surface permanent magnet synchronous motor based on the dynamic motor equations. Simulation results show the possibility to improve the motor torque in faulty case by changing a balanced sinusoidal current reference by unbalanced one.