A novel co-axial dual flux-switching permanent magnet machine for hybrid electric vehicles

The principle of a dual mechanical port (DMP) machines is proposed in 2002 [1], and since then, many different topologies of DMP machines have been proposed [2]. The structure of the DMP machine which has been proposed in [3] is compromised by inner motor and outer motor, the inner motor is compromised by inner rotor and outer rotor, and the outer motor is compromised by outer rotor and the stator, the outer rotor is commonly shared by the two machines, however, the inner rotor is a winding rotor this structure of the DMP machine need brush and slip ring which will cause loss, and it need scheduled maintenance.