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Harmonic disturbance attenuation in a three-pole active magnetic bearing test rig using a modified notch filter

Mahdi Darbandi, S ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1177/1077546315586494
  3. Abstract:
  4. This study is concerned with the problem of harmonic disturbance rejection in active magnetic bearing systems. A modified notch filter is presented to identify both constant and harmonic disturbances caused by sensor runout and mass unbalance. The proposed method can attenuate harmonic displacement and currents at the synchronous frequency and its integer multiples. The reduction of stability is a common problem in adaptive techniques because they alter the original closed-loop system. The main advantage of the proposed method is that it is possible to determine the stability margins of the system by few parameters. The negative phase shift of the modified notch filter can be tuned to achieve a desired phase margin, while the gain margin can also be adjusted separately. It is shown that the modified notch filter can be designed to suppress multiple harmonics at the same time. It is implemented on a three-pole magnetic bearing test rig to evaluate its performance. Simulation and experimental results indicate that the presented method can be successfully applied to compensate the periodic disturbances such as sensor runout and mass unbalance in active magnetic bearing systems. © 2017 SAGE Publications
  5. Keywords:
  6. Active magnetic bearing ; Harmonic disturbance ; Sensor runout ; Bandpass filters ; Closed loop systems ; Disturbance rejection ; Harmonic analysis ; Magnetic bearings ; Magnetism ; Phase shift ; System stability ; Active magnetic bearing systems ; Harmonic displacement ; Harmonic disturbance rejection ; Harmonic disturbances ; Mass unbalance ; Run outs ; Synchronous frequency ; Notch filters
  7. Source: JVC/Journal of Vibration and Control ; Volume 23, Issue 5 , 2017 , Pages 770-781 ; 10775463 (ISSN)
  8. URL: http://journals.sagepub.com/doi/abs/10.1177/1077546315586494