Design and Analysis of a Novel Partitioned Stator Hybrid Excitation Machine

This paper proposes a new partitioned stator hybrid excitation (PSHE) machine. The conventional single stator-HE machine suffers from the space conflict between field sources, i.e. permanent magnets (PMs), wound field (WF) winding, and armature windings, which are all placed in a single stator. In the proposed PSHE machine, they were separately accommodated in two different stators, between which a rotor consisted of segmented iron pieces was sandwiched. The paper presented design consideration and performance in terms of flux weakening capability, torque enhancement capability, and PM torque without WF winding current. It shows that by introducing iron flux bridges in the inner stator tooth for WF winding magnetomotive force, better hybrid excitation between the PMs and the WF windings can be achieved, resulting in 79.39% flux weakening capability and 79.12% torque enhancement capability, whilst those of the PSHE machine without iron flux bridge are only 12.80% and 12.12%, respectively. A prototype was built and tested to verify the finite element predicted results.