Comprehensive research on compound-structure permanent-magnet synchronous machine system used for HEVs

Abstract

Compound-structure permanent-magnet synchronous machine (CS-PMSM) system is a hybrid electric vehicle (HEV) power train concept. Six typical topologies of CS-PMSM are proposed. The comprehensive research based on the radial-radial flux CS-PMSM is presented in this paper. The method of magnetic decoupling is analyzed. The electromagnetic performance is investigated by finite-element method (FEM) and satisfactory results are obtained. The cooling system is designed and the thermal performance is evaluated by FEM and experiments. A special controller suitable for this kind of machine is designed. The CS-PMSM system is validated by simulation and experiment, which provides a reference for the potential application.