Design and analysis of an outer-rotor parallel-hybrid-excited vernier machine

In this paper, an outer-rotor parallel-hybrid-excited vernier machine is proposed. In order to realize the parallel hybrid excitation, the homopolar configuration is adopted to artfully combine the permanent magnet (PM) flux path and the electromagnet flux path together. Firstly, the structure of the proposed machine is presented. Secondly, its operating principle is studied and discussed. Thirdly, its performance for flux regulation is analyzed based on the 3-D finite element analysis. Finally, the prototype of the proposed machine is manufactured and tested to verify the analytical results.