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

Ming TANG; Chang-sheng ZHU; Jie YU

doi:10.1631/jzus.C1300023

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

计算机与自动化 | Updated：2022-12-09

- Self-sensing active magnetic bearing using real-time duty cycle
- Self-sensing active magnetic bearing using real-time duty cycle
- 信息与电子工程前沿（英文） 2013年14卷第8期页码：600-611
- 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：
  
  Project (No. LZ13E070001) supported by the Natural Science Foundation of Zhejiang Province, China
- DOI：10.1631/jzus.C1300023
  中图分类号： TP23
- 收稿：2013-01-20，
  
  修回：2013-;7-12，
  
  纸质出版：2013-08
- Accepted：
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Self-sensing active magnetic bearing using real-time duty cycle[J]. 信息与电子工程前沿（英文）, 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.
Self-sensing active magnetic bearing using real-time duty cycle[J]. 信息与电子工程前沿（英文）, 2013,14(8):600-611. DOI： 10.1631/jzus.C1300023.

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.

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Keywords

references

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