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Study on the Influence of Magnetic Circuit Saturation on Suspension Performance of Bearingless Permanent Magnet Synchronous Motor

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Abstract

Bearingless permanent magnet synchronous motors can rely on the radial electromagnetic force generated by magnetic field coupling to achieve active suspension. However, the coupling between magnetic fields may lead to the saturation of the magnetic circuit, which affects the stability of motor suspension force and is one of the key problems to be solved for bearingless motors. In order to investigate the effect of magnetic circuit saturation on the suspension performance, firstly, the equation of the radial suspension force is derived by combining the influence of the magnetic circuit saturation on the parameters of the motor. The relationship of the magnetic circuit saturation on the stable and fluctuating components of the radial suspension force is obtained, and the fluctuation mechanism of the suspension force under the saturation state is revealed. Secondly, the radial suspension force in different saturation states of the magnetic circuit is calculated by finite element calculation method. Combining the effect of magnetic flux density on the magnetic permeability, the variation of the magnitude and fluctuating of the suspension force with the magnetic field in different magnetic circuit saturation states is given. Finally, the accuracy of the analytical and finite element calculations is demonstrated experimentally.

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Authors and Affiliations

  1. School of Electric and Information Engineering, College of Electrical and Information Engineering, Zhengzhou University of Light Industry, Zhengzhou, Henan, China

    Liming Liu & Hongbo Qiu

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  1. Liming Liu
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  2. Hongbo Qiu
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Correspondence to Liming Liu.

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Liu, L., Qiu, H. Study on the Influence of Magnetic Circuit Saturation on Suspension Performance of Bearingless Permanent Magnet Synchronous Motor. J. Electr. Eng. Technol. 19, 2377–2386 (2024). https://doi.org/10.1007/s42835-023-01720-8

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  • DOI: https://doi.org/10.1007/s42835-023-01720-8

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