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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...
Based on the traditional switched flux PM machine, a novel switched flux hybrid magnet memory motor is developed in this paper, which has extra low coercive force (LCF) magnets and magnetization coils. By changing the magnetization state of LCF magnets during operation, flux enhancing and weakening can be achieved without extra copper loss. The design considerations such as stator/rotor pole combinations,...
Since the claw-pole machines can exhibit a number of attractive features, they have been widely applied to automotive and domestic markets. Nowadays, with the development of rare-earth permanent magnet (PM) and powder metallurgy techniques, high performance and cost-effective design of a multiphase claw-pole stator SPM brushless machine becomes achievable. However, the inherent 3-D structure makes...
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...
The electromagnetic performance of flux-switching and interior PM machines is comparatively studied in this paper. The differences between these two types of PM machines are highlighted and their maximum torque and flux-weakening capabilities are compared analytically and by the finite element method, with due account for different split ratios.
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