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In order to simplify the manufacturing process of variable reluctance (VR) resolvers for HEV/EV applications, a novel VR resolver with non-overlapping tooth-coil windings is proposed in this paper. A comparison of the winding configurations is firstly carried out between the existing and the proposed designs, followed by the description of the operating principle. Further, the influence of actual...
This paper proposes two axial field switched flux machines with partitioned stators (PS), namely axial field PS switched flux permanent magnet (SFPM) machine and axial field PS wound field switched flux (WFSF) machine. Compared with radial field PS machines, these machines show the advantages of better thermal conditions and more robust rotor structures. The operation principles of these machines...
Based on the optimal primary and secondary pole number combination selection principle of linear switched-flux PM machine (LSFPMM) with odd poles primary, a novel 9/10 primary/secondary poles LSFPMM has been developed. In order to increase the thrust force density, some major design parameters, such as secondary pole width, split ratio and primary slot width, were investigated by finite element analysis...
The influence of stator and rotor pole numbers, viz. 6/5, 6/7, 12/10, 12/11, 12/13, and 12/14 stator/rotor poles, etc., on the electromagnetic performance of 3-phase flux-switching PM (FSPM) machines with all and alternate poles wound is investigated in this paper. It shows that the back-emf waveform, winding inductance, unbalanced magnetic force (UMF) and torque density in a FSPM machine are all...
The investigation on flux-switching permanent magnet (FSPM) machines in existing papers has been restricted to specific combination of stator and rotor pole numbers, viz. 12/10 stator/rotor poles. In this paper, the influence of stator and rotor pole numbers on the optimal parameters of the FSPM machines are investigated by the finite element analysis and the lumped parameter magnetic circuit model,...
The split ratio has been optimized for the maximum torque density when the airgap flux density is fixed in existing papers. However, the airgap flux density can vary with the split ratio significantly in interior permanent magnet (IPM) machines due to flux focusing. Therefore, an optimal airgap flux density may exist, together with the optimal split ratio, for the maximum torque in IPM machines. This...
Surveys continuously revealed that many homebuyers suffer regret and dissatisfaction in China real estate market. Previous researches on residential satisfaction had focused on attributes of houses and individual characteristics, but the effects of service quality on post-purchase regret and satisfaction were largely ignored. This paper demonstrated that service quality significantly impacts residential...
A simple analytical method is developed for determining the optimal combination of stator pole and rotor pole numbers for maximum torque from a multi-tooth flux-switching permanent magnet (FSPM) machine. In addition, the rotor pole width and split ratio are optimized by finite element analysis. The optimized multi-tooth FSPM machine exhibits a significantly larger torque capability and requires a...
The influence of design parameters of a flux-switching PM (FSPM) machine for maximum output torque has been investigated by finite element analyses and validated by measurements made on a prototype FSPM motor. These parameters include the split ratio of the inner diameter to outer diameter of the stator, the stator tooth width, the stator magnet thickness, the stator back-iron thickness, the stator...
A simple analytical method is developed to compare the combinations of stator and rotor pole numbers in flux-switching PM machines in terms of back-EMF and electromagnetic torque. The winding connections for machines having all poles and alternate poles wound are determined, based on the coil-EMF vectors. The conditions are established for balanced symmetrical back-EMF waveform. It shows that the...
Several novel linear, either planar or tubular, flux-switching permanent magnet (FSPM) brushless machines with different winding configurations and mover slot/stator pole combinations are proposed and compared, with particular reference to the tubular format. Coil connections are determined from the coil back-EMF vectors. The influence of major design parameters, such as the split ratio, the stator...
A method is proposed for predicting the d- and q-axis inductances and flux-weakening performance of PM brushless AC machines accounting for skew and d-q axis cross-coupling. The method is based on a d-q-axis flux-linkage model, a hybrid 2-D FE-analytical method being used to predict the d- and q-axis inductances. However, it only requires 2-D FE analysis of the magnetic field distribution over a cross-section...
The flux-switching permanent magnet machine has permanent magnets on the stator. The magnet eddy current loss has never been addressed in literature and is investigated in this paper by the finite element method. The influence of operation modes, i.e. constant torque and flux weakening control, is considered, and the methods of reducing the magnet eddy current loss are also discussed.
A lumped parameter magnetic circuit model is employed to predict the influence of the finite length of a flux- switching permanent magnet machine on the electromagnetic torque. It enables performance predictions from 2-D finite element analysis to be used to analyze the electromagnetic performance with due account of end-effects. A simplified method for determining the ratio of actual torque to the...
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