An axial magnetic-field-modulated brushless double-rotor machine for hybrid electric vehicles

This paper proposes an axial magnetic-field-modulated brushless double-rotor machine (MFM-BDRM) for hybrid electric vehicles (HEVs), which can realize the function of speed decoupling. Without brushes and slip rings, it has significant advantages such as low maintenance and high heat dissipation capacity. In this paper, topology and operating principle of the machine are investigated. As the axial MFM-BDRM is simulated with 3-dimensional finite element method, the electromagnetic calculation model is simplified to save calculating time. Moreover, the principle of simplification is summarized. After that, due to the poor power factor of the machine, parameters that influence the power factor are analyzed with simplified model.