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

Xin Luo; Anwen Shen; Renchao Mao

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

Xin Luo

Anwen Shen

Renchao Mao

Vol. 15, No. 5, pp. 1409-1420, Sep. 2015

10.6113/JPE.2015.15.5.1409

Bi-quad filter

PMSM servo

Self-adaption

System identification

Wide-band resonance

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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.

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Cite this article

[IEEE Style]

X. Luo, A. Shen, R. Mao, "A Double Bi-Quad Filter with Wide-Band Resonance Suppression for Servo Systems," Journal of Power Electronics, vol. 15, no. 5, pp. 1409-1420, 2015. DOI: 10.6113/JPE.2015.15.5.1409.

[ACM Style]

Xin Luo, Anwen Shen, and Renchao Mao. 2015. A Double Bi-Quad Filter with Wide-Band Resonance Suppression for Servo Systems. Journal of Power Electronics, 15, 5, (2015), 1409-1420. DOI: 10.6113/JPE.2015.15.5.1409.