Proposal of self-excited wound-field magnetic geared motor for HEV application

This paper describes a permanent-magnet-free magnetic geared motor where magnetic flux variation in differencial frequency between stator rotating magnetic field and rotor rotation speed is effectively utilized for field magnetization instead of permanent magnets. The operation prin ciple of t he self-excitation with diode rectifier on rotor winding circuit is discussed in this paper. Magnetic circuit design and structural design of downsized prototype machine were performed for the purpose of verification of the self-excitation principle. In addition, the adjustable speed drive characteristics of proposed motor are investigated by FE analysis.