Influence of magnet arrangement on torque characteristics of dual-rotor PMSMs

Permanent magnet synchronous motors (PMSMs) are increasingly been used in home electric appliances and electric vehicles/hybrid electric vehicles for high performance and high efficiency. Among the different rotor structures in PMSMs, it is expected that the dual-rotor structure can achieve a higher torque than the conventional single-rotor structure. In this paper, various types of dual-rotor PMSMs with different magnet arrangements are examined to investigate the influence of different magnet arrangements on the torque characteristics of the dual-rotor PMSM. In addition, we describe a magnet arrangement suitable for high torque production in the inner and outer rotors.