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Research Papers

Surge Vibration-Induced Nonlinear Behavior Regulation of Power Amplifier for Magnetic Bearing in a 315 kW Centrifugal Compressor

[+] Author and Article Information
Yin Zhang

Science and Technology on Inertial Laboratory,
Beihang University,
37 Xueyuan Road,
Beijing 100191, China
e-mail: zhangyin@buaa.edu.cn

Shiqiang Zheng

Science and Technology on Inertial Laboratory,
Beihang University,
37 Xueyuan Road,
Beijing 100191, China
e-mail: zhengshiqiang@buaa.edu.cn

Chen Ma

Beijing Aerospace Institute for Metrology and
Measurement Technology,
1 Nandahongmen Road,
Beijing 100076, China
e-mail: horse_machine@163.com

Cheng Chen

Science and Technology on Inertial Laboratory,
Beihang University,
37 Xueyuan Road,
Beijing 100191, China
e-mail: 18811442036@163.com

Can Wang

Science and Technology on Inertial Laboratory,
Beihang University,
37 Xueyuan Road,
Beijing 100191, China
e-mail: wangcan_cqu@buaa.edu.cn

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received February 22, 2017; final manuscript received August 23, 2017; published online October 4, 2017. Assoc. Editor: Patrick S. Keogh.

J. Vib. Acoust 140(2), 021003 (Oct 04, 2017) (9 pages) Paper No: VIB-17-1074; doi: 10.1115/1.4037849 History: Received February 22, 2017; Revised August 23, 2017

The severe vibration induced by surge and rotating stall is an obstacle to the stability of a magnetically suspended centrifugal compressor (MSCC). In order to suppress the severe vibration caused by surge instability, this paper focuses on compressor surge performance improvements enabled by power amplifier control improvements which result in increased dynamic load capacity (DLC) of the systems axial thrust magnetic bearing. A complete discrete-time model of the active magnetic bearing (AMB) power amplifier, composed of three piecewise linear intervals, is developed. A comprehensive view of the dynamic evolution process from stable state to bifurcation for the power amplifier is also analyzed. In order to stabilize the unstable periodic orbits in the power amplifier, a time-delay feedback control (TDFC) method is introduced to enhance the stability of the power amplifier, while the MSCC is subjected to the surge instability. Simulation results show that the stable region of the power amplifier is extended significantly using the TDFC method. Finally, the experimental investigations performed by an MSCC test rig demonstrate the effectiveness of the proposed solution under the conditions of modified surge and mild surge.

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References

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Figures

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Fig. 1

Schematic layout of an MSCC test rig

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Fig. 2

Schematic diagram of an MSCC

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Fig. 3

Block diagram of one degree-of-freedom AMB-rotor control system: (a) closed-loop system and (b) H-bridge inverter

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Fig. 4

The variations of VT1 and iL during a single switching period

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Fig. 5

The variations of VT1 and iL during the three switching period

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Fig. 6

Bifurcation diagram of the coil current and feedback gain while the AMB-rotor system is operating in the static state

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Fig. 7

Bifurcation diagram of the coil current and feedback gain while the AMB-rotor system is operating in the rotating state

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Fig. 8

Bifurcation diagram of the coil current varied with the current-loop gain k and feedback coefficient ki: (a) using TDFC and (b) without using TDFC

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Fig. 9

Schematic layout of an MSCC test rig

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Fig. 10

Schematic layout of an MSCC test rig

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Fig. 11

Experimental results of the coil current and the rotor displacement in the case of increasing the load capacity of the power amplifier: (a) without increasing the load capacity of the power amplifier, (b) increase the load capacity without using TDFC method, and (c) increase the load capacity using TDFC method

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Fig. 12

Experimental results of the coil current and the rotor displacement in the modified surge: (a) without increasing the load capacity of the power amplifier, (b) increase the load capacity without using TDFC method, and (c) increase the load capacity using TDFC method

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Fig. 13

Experimental results of the coil current and the rotor displacement in the mild surge: (a) without using TDFC method and (b) using TDFC method

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