Low-noise design of fault-tolerant flux-switching permanent-magnet machines

Low-noise design of fault-tolerant flux-switching permanent-magnet machines

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The high variable flux density in the air-gap of fault-tolerant flux-switching permanent-magnet (FT-FSPM) machine results in rich harmonics of the magnetic field, thus generating large vibration and noise. This study proposes two novel FT-FSPM machines which can effectively reduce the radial pressure, thus reducing the vibration and noise. First, the radial pressure of the initial FT-FSPM machine is analysed. Second, the novel proposed FT-FSPM machines are introduced and analysed. Third, the electromagnetic performance, including back electromotive force, output torque, inductance, and radial pressure harmonics, of the initial and the two proposed machines are compared by finite element method. Then, the vibration modes with corresponding natural frequencies are predicted. The vibration and noise are simulated by boundary element method. Finally, the effectiveness of the low-noise design is verified by measurement results.

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