| Citation: | ZHAO Hang, MIAO Cunxiao, ZHANG Liyuan, et al. Maglev electromagnetic radial spherical magnetic bearing design[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(1): 159-166. doi: 10.13700/j.bh.1001-5965.2016.0027(in Chinese)
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Due to the large interference torque of deflected cylindrical magnetic bearing, this paper designs a novel electromagnetic radial spherical magnetic bearing. When the spherical bearing deflects or offsets, the electromagnetic force will keep pointing to the center of the rotor, which can reduce the interference of the stator poles on the rotor torque and improve the control precision of the magnetic bearing. First, the working principle of the spherical magnetic bearing is illustrated and its mathematical model is established. By using the theory of equivalent magnetic circuit method and finite element numerical method, the current stiffness and displacement stiffness of the spherical bearing are calculated. The results of the two methods agree well with each other, indicating that the finite element model is reasonable. Then, the finite element method is used to analyze the interference torques when spherical magnetic bearings and cylindrical magnetic bearing deflect. The calculating results show that the interference torque of the spherical magnetic bearing is 1.8% that of the cylindrical magnetic bearing when rotor reaches the maximum deflection angle 0.3°, showing that spherical magnetic bearing relative to the cylindrical magnetic bearing has greatly improved in the ability of anti-interference torque. Finally, the interference torques of the spherical magnetic bearings with X and Z offsets are also analyzed, showing that the calculation results are quite to the deflection torque. Therefore, the designed electromagnetic radial spherical magnetic bearing has the advantage of low interference torque, and can be used for high-precision control and angular rate detection of inertial actuator in aerospace engineering.
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