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A Double Bi-Quad Filter with Wide-Band Resonance Suppression for Servo Systems

  • Luo, Xin ;
  • Shen, Anwen ;
  • Mao, Renchao
  • Received : 2015.01.22
  • Accepted : 2015.05.05
  • Published : 2015.09.20

Abstract

In this paper, an algorithm using two bi-quad filters to suppress the wide-band resonance for PMSM servo systems is proposed. This algorithm is based on the double bi-quad filters structure, so it is named, "double bi-quad filter." The conventional single bi-quad filter method cannot suppress unexpected mechanical terms, which may lead to oscillations on the load side. A double bi-quad filter structure, which can cancel the effects of compliant coupling and suppress wide-band resonance, is realized by inserting a virtual filter after the motor speed output. In practical implementation, the proposed control structure is composed of two bi-quad filters on both the forward and feedback paths of the speed control loop. Both of them collectively complete the wide-band resonance suppression, and the filter on the feedback path can solve the oscillation on the load side. Meanwhile, with this approach, in certain cases, the servo system can be more robust than with the single bi-quad filter method. A step by step design procedure is provided for the proposed algorithm. Finally, its advantages are verified by theoretical analysis and experimental results.

Keywords

Bi-quad filter;PMSM servo;Self-adaption;System identification;Wide-band resonance

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