A novel dual rotor flux-bidirectional-modulation machine for hybrid electrical vehicles

Abstract

A novel brushless and gearless power split system is presented in this paper. The proposed system offers an electric solution for continuously variable transmission of the hybrid electrical vehicles (HEV). The key is to use a doubly fed flux bidirectional modulation machine with dual electric port and dual mechanical port to realize the power combination and split in HEV. This electric continuously variable transmission (E-CVT) system integrates the merits of the dual rotor machine and the flux modulation machine and enjoys additional benefits such as high torque density and low cost partial-scale converter. The operation principle, flux modulation principle and steady performance of the machine are investigated. Time stepping finite element method (TS-FEM) is used to analyze the dynamic performance of the proposed system. The prototype is fabricated and the experimental results verify the correctness of the mathematical model and simulation results.