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Abstract
A novel flux-reversal bearingless slice motor with rotor angle independent suspension current (DC-FRBLM) is proposed in this article. The rotor is simple and robust with neither a permanent magnet (PM) nor field windings. And the suspension currents can be controlled independently from the rotor angle. As a result, the merits of fault tolerance, high structure compactness, simple control, and low manufacturing difficulty can be realized. The topology and circuit of the proposed DC-FRBLM are introduced first. The combination requirement of stator slot and rotor tooth number is investigated. Simultaneously, the suspension principle is analyzed theoretically by studying the airgap harmonics of the PM field and armature field. Then, three DC-FRBLMs with different stator slot numbers are analyzed based on finite element analysis. The suspension principle is verified by the airgap field FFT results. The effects of some key design parameters are investigated in order to improve torque/suspension performance. Finally, a DC-FRBLM prototype is manufactured and tested to confirm the theoretical analysis. The experimental results show the proposed prototype can be steadily suspended with rotor angle independent suspension current.
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