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Self-sensing active magnetic bearing using real-time duty cycle
- Self-sensing active magnetic bearing using real-time duty cycle
- Frontiers of Information Technology & Electronic Engineering Vol. 14, Issue 8, Pages: 600-611(2013)
- Affiliations：
1.State Grid Sichuan Electric Power Research Institute, Chengdu 610072, China
2.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
- Author bio：
[ "Ming TANG, tangming_king@163.com" ]
- Funds：
DOI：10.1631/jzus.C1300023
CLC： TP23Received：20 January 2013，
Revised：2013-;7-12，
Published：2013-08
- Accepted：
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Ming TANG, Chang-sheng ZHU, Jie YU. Self-sensing active magnetic bearing using real-time duty cycle[J]. Frontiers of Information Technology & Electronic Engineering, 2013, 14(8): 600-611.
Ming TANG, Chang-sheng ZHU, Jie YU. Self-sensing active magnetic bearing using real-time duty cycle[J]. Frontiers of Information Technology & Electronic Engineering, 2013, 14(8): 600-611. DOI： 10.1631/jzus.C1300023.
摘要
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.
关键词
Keywords
references
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