A Novel Flux Modulation Linear Machine with Dual-Sided Modular Primary and Multiple Pole Pitches

Abstract

This digest proposes a novel flux modulation linear permanent magnet (FMLPM) machine with dual-sided modular primary (DMP) and multiple pole pitches (MPP), suitable for long stroke, high thrust applications. The key of proposed design is that the machine operates in multiple working harmonic mode, which can greatly increase its thrust density without extra PM usage. Moreover, the dual-sided modular primary structure endows the proposed machine with highly balanced three-phase back-EMF, tinny normal force, and a good fault tolerant capability. The detailed information of the configuration and operation principle will be introduced. Besides, the optimization procedure of several key parameters will be carried out to maximize the thrust density of proposed machines. Finally, to verify the superiority of the novel FMLPM machine, it is compared to an FMLPM machine with DMP but without MPP and a conventional FMLPM machine without DMP and MPP. The finite element analysis (FEA) results shows that under the same machine volume, heat loading and PM usage, the proposed FMPM machine can exhibit much larger torque density.