A Novel High-Speed Hybrid PMSM and Homopolar Inductor Alternator Used for Double-Frequency Power Generation System

In some special applications such as shipping and aerospace, the double-frequency generator is needed. The structure of existing double-frequency generator is complex, and the operating rotating speed of the existing double-frequency generator is not so high, which limits the power density of the double-frequency generator. This paper introduces a novel high-speed hybrid permanent magnet synchronous motor (PMSM) and homopolar inductor alternator (HIA) used for double-frequency power generation system. The novel machine combined the PMSM and HIA, and it has the advantages of both HIA and PMSM. The structure and operating principle of it are presented in this paper. The no-load air-gap magnetic field is analyzed in this paper. The coupling of flux between windings of HIA and PMSM is analyzed. And the FEM simulation is done to verify the theory of this paper; the simulation results show that the novel alternator has good performance for double-frequency power generation system.