Dual Consequent Pole Variable Flux Vernier Machine for wide speed range

Abstract

This paper proposes a variable flux vernier machine for a wide speed range with the dual consequent pole configuration which has permanent magnets (PMs) on both the stator and rotor. The topology of the machine was suggested to realize wide speed range operation by changing magnetization state of the magnets. The rotor has the consequent pole structure with high coercive force (HCF) material composed PMs, while the stator has PMs positioned between the flux modulation poles (FMPs). Stator mounted PMs were made of low coercive force (LCF) materials which can be easily demagnetized or magnetized for variable flux machines. The proposed machine was able to reduce the magnet flux by demagnetization of the stator LCF PMs to reach higher speed range. Also, reverse magnetization allowed the machine to achieve further speed range.