Impact of rotor design on flux control capability of hybrid excited synchronous machine

The paper presents the optimization and comparison of different rotor design concepts of an Electrically Controlled Permanent Magnet Excited Synchronous Machine (ECPMSM) possessing a field control capability. The experimental results of a no-load back electromotive force (back-EMF) waveforms, cogging torque and electromagnetic torque values are presented in detail. Moreover, in order to compare the over-speed capability of the machine in the varying rotor designs, the predicted performances, i.e. range of speed and resulting torque of the machines, have been estimated.