For a magnetically levitated flexible rotor (MLFR), the amount of residual imbalance not only generates undesired vibrations, but also results in excessive bending, which may cause it hit to the auxiliary bearings. Thus, balancing below the critical speed is essential for the MLFR to prevent the impact. This paper proposes a balancing method of high precision and high efficiency, basing on virtual trial-weights. First, to reduce the computed error of rotor's mode shapes, a synchronous notch filter is inserted into the active magnetic bearing (AMB) controller, achieving a free support status. Then, AMBs provide the rotor with the synchronous electromagnetic forces (SEFs) to simulate the trial-weights. The SEFs with the initial angles varying from 0 deg to 360 deg in the rotational frame system result in continuous changes in the MLFR's deflection. Last, correction masses are calculated according to the changes. Compared to the trail-weights method, the new method needs not test-runs, which improves the balancing efficiency. Compared to the no trail-weights method, the new method does not require a precise model of the rotor-bearing system, which is difficult to acquire in the real system. Experiment results show that the novel method can reduce the residual imbalance effectively and accurately.
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September 2014
Research-Article
A Field Balancing Technique Based on Virtual Trial-Weights Method for a Magnetically Levitated Flexible Rotor
Yingguang Wang,
Yingguang Wang
1
Science and Technology on Inertial Laboratory,
e-mail: wangyingguang_2005@126.com
Beihang University
,Shining Building 403
,Xueyuan Road
,Beijing 100191
, China
e-mail: wangyingguang_2005@126.com
1Corresponding author.
Search for other works by this author on:
Jiancheng Fang,
Jiancheng Fang
Professor
Science and Technology on Inertial Laboratory,
e-mail: Fangjiancheng@buaa.edu.cn
Science and Technology on Inertial Laboratory,
Beihang University
,Shining Building 403
,Xueyuan Road
,Beijing 100191
, China
e-mail: Fangjiancheng@buaa.edu.cn
Search for other works by this author on:
Shiqiang Zheng
Shiqiang Zheng
Science and Technology on Inertial Laboratory,
e-mail: zhengshiqiang@buaa.edu.cn
Beihang University
,Shining Building 403
,Xueyuan Road
,Beijing 100191
, China
e-mail: zhengshiqiang@buaa.edu.cn
Search for other works by this author on:
Yingguang Wang
Science and Technology on Inertial Laboratory,
e-mail: wangyingguang_2005@126.com
Beihang University
,Shining Building 403
,Xueyuan Road
,Beijing 100191
, China
e-mail: wangyingguang_2005@126.com
Jiancheng Fang
Professor
Science and Technology on Inertial Laboratory,
e-mail: Fangjiancheng@buaa.edu.cn
Science and Technology on Inertial Laboratory,
Beihang University
,Shining Building 403
,Xueyuan Road
,Beijing 100191
, China
e-mail: Fangjiancheng@buaa.edu.cn
Shiqiang Zheng
Science and Technology on Inertial Laboratory,
e-mail: zhengshiqiang@buaa.edu.cn
Beihang University
,Shining Building 403
,Xueyuan Road
,Beijing 100191
, China
e-mail: zhengshiqiang@buaa.edu.cn
1Corresponding author.
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received October 14, 2013; final manuscript received March 10, 2014; published online April 21, 2014. Assoc. Editor: Jerzy T. Sawicki.
J. Eng. Gas Turbines Power. Sep 2014, 136(9): 092502 (7 pages)
Published Online: April 21, 2014
Article history
Received:
October 14, 2013
Revision Received:
March 10, 2014
Citation
Wang, Y., Fang, J., and Zheng, S. (April 21, 2014). "A Field Balancing Technique Based on Virtual Trial-Weights Method for a Magnetically Levitated Flexible Rotor." ASME. J. Eng. Gas Turbines Power. September 2014; 136(9): 092502. https://doi.org/10.1115/1.4027214
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