A Dynamic Mathematical Model and Vector Block Diagrams for a Class of Hybrid Field Synchronous Motors

Abstract

This paper proposes a new dynamic mathematical model and new block diagrams for a newly emerging class of salient-pole hybrid-field synchronous motors (HFSM) that have rotor field by both permanent magnet and winding. The proposed new mathematical model has the following completeness and generality. 1) It consists of three consistent basic equations such as circuit, torque and energy-transmission equations. 2) It deals with pole saliency and contains non-saliency as a special case. 3) It is a dynamic model and contains static one as a special case. 4) It is established in the general reference frame including stator and rotor reference frames as special cases. The proposed new block diagrams using vector signals for salient-pole HFSM is established based on the new model. It has the following attractive features. 1) It succeeds in realizing clear configurations with physically meaningful vector signals, which are helpful for understanding motor electromagnetic mechanism and useful for designing controllers for the salient-pole HFSM. 2) Vector signals utilized as transfer signals between blocks are defined in the general reference frame. Consequently, the vector-signal block diagrams in the frame can be directly and easily reduced to the ones in such a specific frame as stator and rotor frames. 3) It is compact. Two typical and compact but sufficiently general vector-signal block diagrams are newly presented.