| Citation: | FU Baiheng, WANG Weijie, WANG Yuanqin, et al. Design and analysis of high precision for spherical Lorentz force magnetic bearing[J]. Journal of Beijing University of Aeronautics and Astronautics, 2022, 48(11): 2222-2229. doi: 10.13700/j.bh.1001-5965.2021.0103(in Chinese)
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Aim at solving following problems. Firstly, the limited deflection angle of the cylindrical Lorentz force magnetic bearing (LFMB) can leads to the short duration of torque output of magnetically suspended control and sensing gyroscope (MSCSG). Secondly, the low uniformity of magnetic density between the LFMB's air gap will also affect the control sensitivity of the MSCSG. A high-precision spherical design and analysis of LFMB are proposed. The spherical LFMB's rotor spherical magnetic sleeve and stator spherical winding are both concentric with the double spherical gyroscope rotor, and the air gap is spherical shell shape, which ensures that the width of the air gap on both sides of the winding coil remains unchanged during deflection. Compared to the cylindrical LFMB, the deflection angle of the spherical LFMB is increased from ±0.6° to ±2°. The mathematical analysis model of the air gap magnetic density of the cylindrical and spherical LFMB is derived by the equivalent magnetic circuit method, and the finite element simulation model of the cylindrical and spherical LFMB is constructed based on the ANSYS command stream. The simulation analysis shows that the maximum magnetic density of the spherical LFMB decreases by 34.1% compared to the cylindrical LFMB within the deflection range of the rotor along the deflection centerline. When the rotor is not deflected, the uniformity of the magnetic density at the cross-section of the spherical LFMB coil increases by 11.6% compared to the cylindrical. When the rotor is deflected, the uniformity of the magnetic density at the cross-section of the spherical LFMB coil increases by 17.7% compared to the cylindrical. The proposed method lays the foundation for the improvement of the control and sensitivity of the magnetically suspended control and sensing gyroscope.
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