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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2018-12-13
Dynamics and Stiffness Analysis of a Homopolar Magnetic Bearing
By
Xiaojun Ren,

    Dr. Xiaojun Ren

    School of Mechanical Engineering

    University of Science and Technology Beijing

    China

    Homepage

Jinji Sun,

    Dr. Jinji Sun

    School of Instrument Science and Opto-electronics Engineering

    Beihang University

    China

    Homepage

Cunxiao Miao

    Dr. Cunxiao Miao

    School of Mechanical Engineering

    University of Science and Technology Beijing

    China

    Homepage

Progress In Electromagnetics Research M, Vol. 77, 29-40, 2019
doi:10.2528/PIERM18091503 | Google Scholar

Abstract
Decreasing eddy current is very important for the realization of stability control of HoMB system. In order to improve the dynamic performance precision of HoMB in the design stage, the dynamics and stiffness analysis of a homopolar magnetic bearing (HoMB) has been studied in this paper. Because the polarities of the magnetic poles were not changed during the rotation of rotor, the effect of eddy-currents was often ignored in the previous researches. However, when the frequencies of vibration caused by external disturbance and control currents are very high, eddy-current effects have significant influence on the performance of HoMB. In order to predict the HoMB performance, guide the HoMB design and control of the HoMB system in high frequency, a dynamics model was built on the equivalent circuit method. Parameters of dynamic Modeling are frequency-dependent. The effect of eddy-currents on the current stiffness was studied. The analysis results show that the eddy current effect on HoMB can be reduced by increasing the air gap, decreasing the laminations thickness and decreasing the laminations conductivity.
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Citation
Xiaojun Ren, Jinji Sun, and Cunxiao Miao, "Dynamics and Stiffness Analysis of a Homopolar Magnetic Bearing," Progress In Electromagnetics Research M, Vol. 77, 29-40, 2019.
doi:10.2528/PIERM18091503
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