A novel hybrid-excited flux-modulated memory machine for electrical continuously variable transmission system

This paper proposed a hybrid-excited double rotor double stator permanent magnetic machine applied in electrical continuously variable transmission (E-CVT) system which incorporates with the flux modulation and flux-memorizable concept. This machine can produce relative large torque in low speed region owing to flux modulation effect. Besides, this E-CVT system can achieve high speed operation in flux weakening mode which is realized by applying a short current pulse to demagnetize aluminum-nickel-cobalt (AlNiCo) magnets in this machine. There is no need to introduce a permanent excitation current in winding for this machine which results in avoiding inducing additional excitation losses. The configuration and operation principles of the proposed hybrid-excited flux-modulated memory (HEFMM) machine are presented. Electromagnetic characteristics of the proposed machine are analyzed using the time-stepping finite element method (TS-FEM).