A bearingless switched-reluctance motor (BSRM) has a complicated nonlinear character; therefore, its control strategy is very important to a stable operation. This paper presents a new control strategy for rotating and levitating a 12/8 BSRM with two sets of windings. This strategy can enhance not only the availability of winding currents in producing the radial force to suspend a rotor, but also decrease the torque ripple and stator vibration. First, influences of different combinations of winding magnetomotive force on the radial suspension force and torque are analyzed, and the optimal combination of winding magnetomotive force is gained. Second, based on the optimal combination, the theoretical equations of winding currents are obtained. Consequently, this paper gives the flowchart to calculate the advanced angle and winding currents. Moreover, the torque ripple and stator vibration of BSRM in the new control strategy are analyzed. Finally, simulation model and control system of BSRM with 12/8 poles are designed. Dynamic simulation and experimental results proved the theoretic conclusions.
Radial magnetic force acts on the motor stator cause large vibration and acoustic noise, that have limit the application of switched reluctance motors (SRMs). They can be aggravated when there is unbalanced force due to rotor eccentricity. This paper analyzed the function of bearingless technique in compensating the unbalanced magnetic attraction force; Then the stator radial force mathematic model of bearingless switched reluctance motors (BSRMs) is introduced; System simulation models of SRM and BSRM are built and two motors' stator radial force are analyzed. Radial force harmonic analysis results indicate:The DC restorer and lower order harmonic magnitude of lopsided force decrease sharply compare with which of SRM, Thus it's stator vibration is smaller and can radiate smaller acoustic noise, and BSRM is more fit be used in fields call for lower noise.
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