Investigation of Low Coercive Force Magnet Variable Flux Vernier Machine

Abstract

A variable flux vernier machine (VFVM) which adopts a consequent pole configuration and drum winding was proposed. To clarify the effectiveness of variable flux features in a vernier machine, the proposed machine was investigated in different aspects using the finite element method (FEM). Use of consequent pole and drum winding were intended to reduce the cost of manufacture and to take advantages of their features. The proposed machine was analyzed at variable speeds with different magnetization states of magnets. Torque speed curves of different magnetization states were analyzed to show the wide speed range of the machine. Differences in the vernier effect according to magnetization state were also evaluated. Finally, a conclusion was arrived at that variable flux feature can be a good alternative method to high speed operation of vernier machines.