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To extend the speed range in the switched flux permanent magnet (SFPM) machines, mechanically movable flux adjusters (FAs), which consist of iron pieces located outside the stator, are utilized to adjust the airgap flux density. A comparative study of conventional SFPM machines with different stator/rotor pole combinations, i.e. 12/10, 12/13 and 12/14, and the multi-tooth, E-core, and C-core SFPM...
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