PERMANENT-MAGNET SYNCHRONOUS MOTORS - A COMPREHENSIVE APPROACH TO COGGING TORQUE SUPPRESSION

Torque ripple minimization in permanent-magnet synchronous motors is t raditionally achieved either by special motor design or by an adequate control of the driver. Due to motor-driver interactions, the choice o f driver or motor design must consider the respective performance of e ach. The presented approach provides appropriate current shapes to dri ve a given motor without torque ripple and/or appropriate back EMF sha pes for a given current or voltage supply. Reluctant torque, due to th e interaction between the rotor magnets and the stator slots, is also taken into consideration.