This paper presents a suspension force modeling method of BPMSMs based on Maxwell stress tensor method. By deducing the magnetic flux density of the airgap in BPMSMs using magnetic circuit analytic approach, the suspension force model with rotor eccentricity is established. And then the suspension force of a surface-mounted BPMSM is computed by the finite element method. Furthermore, in order to confirm the performance of the BPMSM and the magnetic suspension in real time, a prototype machine and its control scheme is set up and then corresponding experimental study is carried on. Rotor stabilization with magnetic levitation by using Maxwell tensor modeling method is verified by the simulation and experimental results.
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