Fundamental Science on Novel Inertial Instrument & Navigation System Technology Laboratory

Beijing, China

Fundamental Science on Novel Inertial Instrument & Navigation System Technology Laboratory

Beijing, China
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Han B.,Beihang University | Han B.,Fundamental Science on Novel Inertial Instrument & Navigation System Technology Laboratory | Liu Y.,Beihang University | Liu Y.,Fundamental Science on Novel Inertial Instrument & Navigation System Technology Laboratory | And 2 more authors.
Zhendong Ceshi Yu Zhenduan/Journal of Vibration, Measurement and Diagnosis | Year: 2015

Aiming at the suppression of unbalance vibration in rotors suspended by magnetic bearings, a plug-in repetitive controller is presented. The model of the unbalance vibration is proposed with emphasis on its periodicity. The stability and the abilities of error tracking and disturbance elimination are analyzed with the repetitive controller. The experiment is conducted with a 4 kW magnetic suspension motor at the rotating speed of 10 kr/min. The rotor's peak-to-peak position is reduced by 33% in the x-direction and 37% in the x-direction, and the maximum amplitude of vibration at the rotating frequency is reduced by 42.1% in the x-direction and 45.4% in the x-direction. The results demonstrate that the repetitive controller has good effect on the suppression of the unbalance vibration, and the control precision and stability of the magnetic bearing system are effectively improved. ©, 2015, Nanjing University of Aeronautics an Astronautics. All right reserved.


Liu J.,Beihang University | Liu J.,Fundamental Science on Novel Inertial Instrument & Navigation System Technology Laboratory | Zheng S.-Q.,Beihang University | Zheng S.-Q.,Fundamental Science on Novel Inertial Instrument & Navigation System Technology Laboratory | And 2 more authors.
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | Year: 2014

To solve the instability problem of the magnetic suspension rotor caused by the low frequency vibration during high speed operation, the improved disturbance observer is utilized to observe the low frequency vibration of the magnetic suspension rotor, making a provision for the suppression of the vibration in the controller. The improved disturbance observer can not only correctly observe the low frequency vibration of the magnetic suspension rotor in high speed, but also effectively overcome the effect of the deformation of the magnetic suspension rotor in high speed. Related experiments were performed at 24000 r/min for a 100 kW magnetic suspension motor. The results of the experiments show that the low-frequency gain of the magnetic suspension motor decreased by 20 dB, and the vibration is reduced by 36.8 μm. The control precision increases by 63.89% after adding the improved disturbance observer into the active magnetic bearing system, compared with the original system. The results show that adding the improved disturbance observer into the system can effectively suppress the low frequency vibration and improve the stability of the magnetic suspension motor in high speed. ©, 2014, Nanjing University of Aeronautics an Astronautics. All right reserved.

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