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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...
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 for determining the optimal combination of stator pole and rotor pole numbers for a multi-tooth flux-switching permanent magnet (FSPM) machine, and the optimal design of the stator teeth for maximum torque. In addition, the rotor pole width and the split ratio are optimized by finite element analysis. The optimized multi-tooth FSPM machine exhibits a significantly...
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...
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