Investigation of a compound-structure permanent-magnet synchronous machine used for HEVs

A compound-structure permanent-magnet synchronous machine (CS-PMSM) system used for hybrid electric vehicles (HEVs) has great potential to improve fuel economy and reduce emissions, and has less structural complexity, weight and cost compared to the ones in the commercialized HEVs. In this paper the CS-PMSM system is simulated within ADVISOR and compared to the Toyota Hybrid System (THS), which indicates great potential to become one of the best hybrid systems. Further, a prototype machine of the CS-PMSM was designed and manufactured, and the analysis is carried out based on the results of the FEM calculations and experiments. The special problem of magnetic coupling, thermal property, and efficiency improvement are investigated, respectively, which provides a reference for the potential application.