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新型磁悬浮控制敏感陀螺(MSCSG)高速转子具有万向偏转特性,可输出高精度和高带宽的偏转控制力矩,用于抑制天基平台的周期性振动。MSCSG采用5自由度(DOF)全主动控制,其径向2个扭动DOF的偏转控制由洛伦兹力磁轴承(LFMB)实现。基于LFMB的基本构型,建立电磁力和电磁力矩的数学模型,并分析出气隙磁密均匀度是影响输出力矩精度和角速率测量精度的主要因素。介绍了LFMB的优化设计结构,通过有限元仿真分析,结果表明所设计LFMB通过在内外永磁体表面增加1J50导磁薄片,能够有效提高气隙磁密分布的均匀度,输出控制力矩更加精确,有利于提高控制精度;通过使用梯形永磁体提供更大的供磁面积提高气隙磁密强度以降低功耗,同时梯形永磁体在转子高速旋转时便于限位,保证稳定性。本文研究可为具有偏转特性的磁悬浮类转子陀螺的设计与分析提供有益参考。
New Maglev Sensitive Gyro (MSCSG) High-speed rotors feature universal deflection to output high-precision, high-bandwidth yaw control torque to suppress periodic vibrations in a space-based platform. The MSCSG is fully active with 5 degrees of freedom (DOF) control. The deflection control of 2 radial DOFs is implemented by Lorentz force magnetic bearings (LFMB). Based on the basic configuration of LFMB, a mathematical model of electromagnetic force and electromagnetic moment is established, and the uniformity of air gap magnetic flux density is analyzed to be the main factor that affects the output torque accuracy and angular rate measurement accuracy. The optimized design structure of LFMB is introduced. The results of simulation show that LFMB can increase the uniformity of air-gap flux density by adding 1J50 permeable magnetic sheet on the inner and outer permanent magnets. The output torque is more accurate Which is beneficial to improve the control precision. By using the trapezoidal permanent magnet to provide a larger magnetic supply area, the air gap flux density is increased to reduce the power consumption, and the trapezoidal permanent magnet is convenient for limiting the rotation speed of the rotor to ensure the stability. This study can provide a useful reference for the design and analysis of a gyroscope-like gyroscope with deflection characteristics.