A Novel Double-Sided Linear Flux Switching Machine with Yokeless Secondary for Long Stroke Applications

This article introduces a novel double-sided linear hybrid excitation flux switching machine (DSLHEFSM) with yokeless secondary suitable for long stroke applications. The significant to this novel machine is the elimination of the secondary yoke, which can reduce the volume of the secondary. To reduce cost, ferrite magnets with reduced volume as compared to conventional design are utilized. In order to increase the thrust force density and reduce thrust force ripple under load conditions, the impact of some main design parameters, including split ratio, AC winding slot area, stator pole alignment, stator pole width, stator pole height and turn-on angle are investigated through finite element analysis. The electromagnetic performances of the LHEFSM are analysed including flux linkage, detent force, normal force, no-load EMF, force-velocity curve. Within the same volume constraint and electrical loading, the proposed model achieved higher average thrust force than the conventional model.