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PMSMs with concentrated windings gain more and more interests due to the very short end winding and advantages in the production process, for which they are desirable for wind power generations, electric vehicles and torque propulsion and so on [1]. However, concentrated windings produce a rich spectrum of flux density harmonics, which rotate asynchronously with respect to the rotor, inducing eddy...
Eddy current loss is a typical problem in permanent magnet machines especially in machines equipped with fractional-slot concentrated windings. PM segmentation which cut the circulating path of eddy current in radial flux PM machines have been widely studied in literature to reduce this loss. Both circumferential and axial magnet segmentations were evaluated by an analytical method concerning the...
This paper presents the electromagnetic loss analysis and mitigating methods of switched flux permanent magnet (SFPM) machines. The 2-dimentional finite element (2-D FE) method is used to calculate the flux density in all the mesh elements within stator and rotor iron cores, then the stator and rotor hysterisis, eddy current and excess losses are calculated. The PM eddy current losses have been calculated...
Angular-profile tuning of guided waves in hollow cylinders is implemented by using partial loading of the elements in a circumferentially placed phased array. Each partial loading element generates nonaxisymmetric guided waves in a pipe. In earlier work, numerical calculations and experiments have shown that, for nonaxisymmetric guided waves, circumferential distribution of particle displacements...
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