JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2018, Vol. 48 ›› Issue (4): 94-101.doi: 10.6040/j.issn.1672-3961.0.2017.617

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Fault diagnosis of electromagnetic coil in active magnetic bearing based on current characteristics

CHENG Xin1,2, ZHANG Lin1, HU Yefa1,2, CHEN Qiang1, LIANG Dian1   

  1. 1. School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China;
    2. Hubei Magnetic Suspension Engineering Technology Research Center, Wuhan 430070, Hubei, China
  • Received:2017-09-14 Online:2018-08-20 Published:2017-09-14

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Abstract: Magnetic bearings had been widely used for its excellent performance,but the fault of electromagnetic coil might cause the rotor to lose control and cause serious consequences. A on-line fault diagnosis method of electromagnetic coil formagnetic bearings was proposed through the establishment of mathematical model of digital switching power amplifier output current, the current output characteristic was obtained, and the influence of the coil fault on the output current variation rate was theoretically analyzed. A Matlab/Simulink model was established under the two state modulation,the simulation results demonstrated the theoretical feasibility of the method. A fault diagnosis scheme and related algorithm based on current oversampling was designed.Then a digital switching power amplifier test platform based on digital signal processor(DSP)was built, and the on-line detection experiment of related coil faults was carried out. The experimental results demonstrated the effectiveness of the method discussed in this paper.

Key words: magnetic bearings, switching power amplifier, on-line, current variation rate, fault diagnosis, effectiveness

CLC Number: 

  • TH133.3
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