The rated rotational speed of the magnetically suspended motor (MSM) is always above the bending critical speed to achieve high energy density. The rotor will have a dramatic resonance when it passes the critical speed. Then, the magnetic bearing has to provide large bearing force to suppress the synchronous vibration. However, the bearing force is always limited by magnetic saturation and power amplifier voltage saturation. This paper proposed an optimum damping control method which can make effective use of the limited bearing force to minimize the synchronous vibration amplitude of the rotor nearby the critical speed. The accurate rotor model is obtained by theoretical analysis and system identification. The unbalance force response of the bending mode of the rotor is analyzed. The small gain theorem is used to determine the range of the magnitude of the control system. Then, the relationship of the optimum damping varying with the magnitude and phase of the control system nearby the critical speed is analyzed. The run-up experiments are carried out in 315 kW MSM and the results show the effectiveness and superiority of the optimum damping control method.
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August 2015
Research-Article
Optimum Damping Control of the Flexible Rotor in High Energy Density Magnetically Suspended Motor
Jiancheng Fang,
Jiancheng Fang
Science and Technology
on Inertial Laboratory,
e-mail: fangjiancheng@buaa.edu.cn
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:
Enqiong Tang,
Enqiong Tang
1
Science and Technology
on Inertial Laboratory,
e-mail: tang.forever@163.com
on Inertial Laboratory,
Beihang University
,Shining Building 403
,Xueyuan Road
,Beijing 100191
, China
e-mail: tang.forever@163.com
1Corresponding author.
Search for other works by this author on:
Shiqiang Zheng
Shiqiang Zheng
Science and Technology
on Inertial Laboratory,
e-mail: zhengshiqiang@buaa.edu.cn
on Inertial Laboratory,
Beihang University
,Shining Building 403
,Xueyuan Road
,Beijing 100191
, China
e-mail: zhengshiqiang@buaa.edu.cn
Search for other works by this author on:
Jiancheng Fang
Science and Technology
on Inertial Laboratory,
e-mail: fangjiancheng@buaa.edu.cn
on Inertial Laboratory,
Beihang University
,Shining Building 403
,Xueyuan Road
,Beijing 100191
, China
e-mail: fangjiancheng@buaa.edu.cn
Enqiong Tang
Science and Technology
on Inertial Laboratory,
e-mail: tang.forever@163.com
on Inertial Laboratory,
Beihang University
,Shining Building 403
,Xueyuan Road
,Beijing 100191
, China
e-mail: tang.forever@163.com
Shiqiang Zheng
Science and Technology
on Inertial Laboratory,
e-mail: zhengshiqiang@buaa.edu.cn
on Inertial Laboratory,
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 November 14, 2014; final manuscript received December 8, 2014; published online January 28, 2015. Editor: David Wisler.
J. Eng. Gas Turbines Power. Aug 2015, 137(8): 082505 (9 pages)
Published Online: August 1, 2015
Article history
Received:
November 14, 2014
Revision Received:
December 8, 2014
Online:
January 28, 2015
Citation
Fang, J., Tang, E., and Zheng, S. (August 1, 2015). "Optimum Damping Control of the Flexible Rotor in High Energy Density Magnetically Suspended Motor." ASME. J. Eng. Gas Turbines Power. August 2015; 137(8): 082505. https://doi.org/10.1115/1.4029393
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