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CLC number: TP23

On-line Access: 2013-08-02

Received: 2013-01-20

Revision Accepted: 2013-05-17

Crosschecked: 2013-07-12

Cited: 2

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Citations:  Bibtex RefMan EndNote GB/T7714

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Journal of Zhejiang University SCIENCE C 2013 Vol.14 No.8 P.600-611

10.1631/jzus.C1300023


Self-sensing active magnetic bearing using real-time duty cycle


Author(s):  Ming Tang, Chang-sheng Zhu, Jie Yu

Affiliation(s):  State Grid Sichuan Electric Power Research Institute, Chengdu 610072, China; more

Corresponding email(s):   tangming_king@163.com

Key Words:  Self-sensing, Active magnetic bearing (AMB), Frequency spectrum characteristic


Ming Tang, Chang-sheng Zhu, Jie Yu. Self-sensing active magnetic bearing using real-time duty cycle[J]. Journal of Zhejiang University Science C, 2013, 14(8): 600-611.

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author="Ming Tang, Chang-sheng Zhu, Jie Yu",
journal="Journal of Zhejiang University Science C",
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number="8",
pages="600-611",
year="2013",
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%T Self-sensing active magnetic bearing using real-time duty cycle
%A Ming Tang
%A Chang-sheng Zhu
%A Jie Yu
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%P 600-611
%@ 1869-1951
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.C1300023

TY - JOUR
T1 - Self-sensing active magnetic bearing using real-time duty cycle
A1 - Ming Tang
A1 - Chang-sheng Zhu
A1 - Jie Yu
J0 - Journal of Zhejiang University Science C
VL - 14
IS - 8
SP - 600
EP - 611
%@ 1869-1951
Y1 - 2013
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.C1300023


Abstract: 
In a self-sensing active magnetic bearing (AMB) system driven by pulse width modulation (PWM) switching power amplifiers, the rotor position information can be extracted from coil current and voltage signals by a specific signal demodulation process. In this study, to reduce the complexity of hardware, the coil voltage signal was not filtered but measured in the form of a duty cycle by the eCAP port of DSP (TMS320F28335). A mathematical model was established to provide the relationship between rotor position, current ripple, and duty cycle. Theoretical analysis of the amplitude-frequency characteristic of the coil current at the switching frequency was presented using Fourier series, Jacobi-Anger identity, and Bessel function. Experimental results showed that the time-varying duty cycle causes infinite side frequencies around the switching frequency. The side frequency interval depends on the varying frequency of the duty cycle. Rotor position can be calculated by measuring the duty cycle and demodulating the coil current ripple. With this self-sensing strategy, the rotor system supported by AMBs can steadily rotate at a speed of 3000 r/min.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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