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A novel doubly-fed flux reversal linear machine (DF-FRLM) is proposed in this paper, which has two sets of armature windings wound on stator and mover teeth, respectively. The proposed DF-FRLM can exhibit significantly higher thrust force than the conventional FRLM by fully utilizing the stator slot space. The configuration and operation principle of a 6/5 mover/stator-pole DF-FRLM are described. In order to obtain maximum thrust force, the major design parameters of both conventional FRLM and proposed DF-FRLM are optimized by 2D finite element (FE) method. The optimized DF-FRLM and FRLM are investigated and compared in terms of the electromagnetic performance. It is found that the average thrust force of the optimized DF-FRLM is 1.23 times that of the optimized FRLM. In addition, the optimized DF-FRLM can achieve 34.4% higher average thrust force compared to the conventional FRLM whose geometry parameters are the same as that of the optimized DF-FRLM. Furthermore, a periodic model of the DF-FRLM is used to analyze the influence of the longitudinal end effect on the machine electromagnetic performance. Finally, experimentation is carried out to verify the 2D FE simulation result.

A Novel Doubly-Fed Flux Reversal Linear Machine With Armature Windings Wound on Both Stator and Mover Teeth