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A series-hybrid variable flux memory (VFM) machine employing two different kinds of permanent magnets (PMs) on alternate rotor poles is investigated. This machine features controllable PM flux and good flux-weakening capability, as well as improved torque density. However, the unipolar end leakage flux occurs when the fluxes produced by two different kinds of PMs are not balanced. Therefore, the series...
In this paper, a novel switched flux permanent-magnet (SFPM) memory machine, which consists of changeable magnetized permanent magnets (CMPMs) in the stator, is developed and investigated. By changing the magnetization directions of CMPMs, the PM flux linkage can be either enhanced or weakened. When PM flux linkage is weakened at high speed, the flux density in the lamination as well as iron loss...
Novel topologies of switched flux permanent magnet (SFPM) machines with mechanically movable flux adjusters (FAs) for either all or alternative stator poles in order to extend the operation speed range are developed and analysed in this paper. Compared with the FAs which are located outside all of the stator poles of SFPM machines (all FAs), the alternative stator pole FA structure (alternative FAs)...
The iron loss in flux-switching permanent magnet (FSPM) machine is investigated by the finite element method in this paper. Since the permanent magnets in a FSPM machine are on the stator, rather than on the rotor as in the conventional PM machines, the iron loss exists not only in the stator but also in the rotor, while its calculation becomes more difficult due to complex flux density waveforms...
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