Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Improved design of Lorentz force-type magnetic bearings for magnetically suspended gimballing flywheels

  • Liu, Qiang (Beijing Institute of Petrochemical Technology) ;
  • Wang, Qirui (Beijing Institute of Petrochemical Technology) ;
  • Li, Heng (Beijing Institute of Petrochemical Technology) ;
  • Peng, Cong (College of Automation Engineering, Nanjing University of Aeronautics and Astronautics) ;
  • Xu, Kang (Beijing Institute of Petrochemical Technology) ;
  • Ren, Yuan (Department of Aerospace Science and Technology, Space Engineering University)
  • Received : 2020.07.30
  • Accepted : 2020.12.16
  • Published : 2021.03.20
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Abstract

A Lorentz force-type magnetic bearing (LFMB) with good linearity is suitable for the high-precision deflection control of a magnetically suspended gimballing flywheel (MSGFW). In this paper, a novel LFMB with improved double magnetic circuits is presented. Inclined magnetization Halbach array permanent magnets (PMs) and trapezoidal PMs are utilized for improving the magnetic flux density. A mathematical model of the magnetic flux density is established based on the equivalent surface current method. To obtain the maximum magnetic flux density, the optimal magnetization angle is calculated, and the dimension parameters are optimized by the sequential quadratic programming method. A maximum magnetic flux density of 0.615 T is obtained, which is 7.9% larger than that of an LFMB with conventional double magnetic circuits. Based on simulation results, LFMB prototype magnetic flux density experiments are carried out. The results show that the magnetic flux density fluctuations of the two LFMB schemes are similar. The maximum magnetic flux density of 0.608 T is increased by 6.7% when compared with that of the LFMB with conventional double magnetic circuits at 0.57 T. The error between the simulation and the experiment is within 5%. This indicates that the LFMB with improved double magnetic circuits is promising when it comes to meet the agile maneuver requirements of the spacecraft.

Keywords

Acknowledgement

This paper is supported by the Training Funded Project of the Beijing Youth Top-Notch Talents of China under Grant 2017000026833ZK22, High-level Teachers in Beijing Municipal Universities in the Period of 13th 5-year Plan under Grant CIT&TCD201804034, National Natural Science Foundation of China under Grant 61703203, and Natural Science Foundation of Jiangsu Province under Grant BK20170812.

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