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In this paper a bearingless permanent magnet slice motor (BPMSM) is investigated and its levitation principle and mathematical model of levitation force are analyzed and deduced respectively. A extended state observer (ESO) of levitation system is established for observation of outer disturbance imposing on levitation system. Then, the observed disturbance is utilized to form compound control with...
In this paper the polar-coordinate mathematical model of levitation force on bearingless permanent-magnet synchronous motor was deduced. The single closed-loop direct control of levitation force was proposed based on the mathematical model deduction and combined with space vector pulse with modulation algorithm. The traditional closed-loop control of levitation current was ignored using the single...
The levitation fluctuation is unavoidable when bearingless motor is working. The motor's working performance can be affected by levitation fluctuation. It is vital to constrain the levitation fluctuation. In this paper, a kind of consequent-pole bearingless permanent magnet-type motor is studied and levitation fluctuation sources are analyzed. Because the normal levitation control algorithm PID is...
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