Initial investigation of modular outer rotor hybrid excitation flux switching motor based on finite element method.

Research and development toward flux switching machines (FSMs) have increased throughout the past decades. It comes handy with the advantage of having high output torque and power densities which suitable in electric vehicle application. Most research have been focusing only on inner rotor configuration leaving a few outer rotor research. As to achieve high output torque at low speed and less copper loss thus resulting to the development of outer rotor permanent magnet flux excitation machine PMFSM. Despite having such advantages, the design faces such disadvantage of having high cogging torque and non-sinusoidal back-emf waveform. In order to overcome the highlighted problems, this paper presents initial analyses on modular outer rotor structure for hybrid excitation flux switching motor based on finite element method. From the analyses, it shows that the modular rotor structure has good capability in reducing cogging torque and back-emf waveforms. [ABSTRACT FROM AUTHOR]