Adaptive control of unbalance vibration for magnetic bearings based on phase-shift notch filter within the whole frequency range

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (20) : 16-20.

CUI Pei-ling1,2，ZHAO Guang-zai1,2，FANG Jian-cheng1,2，LI Hai-tao1,2

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Abstract

Mass unbalance of high-speed magnetically suspended rotor causes unbalance force, which induces synchronous vibration. To suppress vibration effectively within the operating speed ranges, a method based on a phase-shift notch filter is proposed. The control strategy of the method is that the magnetic bearing force is calculated as the input of band-pass filter and the output of the filter is feedbacked to the original system, in which the low-pass characteristic of power amplifier need not to be considered. Meanwhile, based on the theoretical analysis on the sensitivity function of the overall control system, the stable system in the rotating speed range is achieved based on the adaptive adjustment of the phase shift in the band-pass filter with respect to rotor speeds. Experimental results are given to show the effectiveness of the proposed approach, in which the synchronous magnetic bearing force is reduced within the whole frequency range.

Key words

magnetically suspended rotor / unbalance vibration / phase-shift notch filter / whole frequency range

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CUI Pei-ling1,2，ZHAO Guang-zai1,2，FANG Jian-cheng1,2，LI Hai-tao1,2 . Adaptive control of unbalance vibration for magnetic bearings based on phase-shift notch filter within the whole frequency range[J]. Journal of Vibration and Shock, 2015, 34(20): 16-20

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