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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...
Memory motor has been researched extensively in the last decade due to its online magnetization capability. Among many types of designs, hybrid magnet memory motor (HMMM) has highest torque density. This paper investigates the cross coupling effect of HMMM in the motor topology proposed by Sakai. The analysis model is introduced firstly. Based on the magnetic circuit model, the mechanism of open-circuit...
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...
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