Abstract
Novel linear hybrid-excited slot permanent magnet machines (LHESPMMs) are proposed in this paper. First, the topology and geometric parameters of the LHESPMMs with 12 slots are introduced, and the corresponding basic operating principle is investigated. To the 12-slots and 10/11/13/14-poles LHESPMMs, global optimization using genetic algorithm is implemented. Then, the electromagnetic performances including the flux linkage, back-electromotive force, detent force, and static force–current characteristics are comparatively studied using the 2-D finite-element (FE) analysis. It is shown that 12-slots/13-poles (12s/13p) are the optimal slot/pole combinations. Furthermore, the thrust force performances of 12s/13p linear variable flux reluctance machine (LVFRM), linear vernier permanent magnet machine, and LHESPMM are compared. It shows that LHESPMM can provide much higher thrust force than does LVFRM. With the increase of current, LHESPMM exhibits better thrust force capability than that of the other two machines. Finally, a prototype of 12s/13p LHESPMM is manufactured and tested to validate the 2-D FE predicted results.
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