Analysis of flux switching permanent magnet machine design for high-speed applications

The purpose of this paper is to contribute to the high-speed aspect of flux switching permanent magnet machine by performing detailed electromagnetic design, performance evaluation, and trade-off comparisons. Topologies with multiple numbers stator slot/rotor pole combinations are analyzed, and their challenges for high-speed operation are discussed. The topology with 12 stator slots and 10 rotor poles is analyzed in detail including loss characterization. Properties of iron loss, especially the eddy current loss, are analyzed using fast Fourier transformation. Magnet eddy current loss is studied at high-speed conditions for neodymium magnets. Axial magnet segmentation is found to be effective for reducing the magnet eddy current loss. Windage loss of the rotor also is estimated using analytical methods and it cannot be neglected for high-speed operations.