关键词: 磁性, 结构设计, 无磁转台

Abstract: Structural design of tri-axial non-magnetic turntable is studied. A modeling method of structural design based on magnetism specifications is presented. Considering the relationship of material, strength, dimension and magnetism, a rational framework of the turntable is proposed, which can provide sufficient margin for the choose of strength, stiffness and control strategy. Based on the model of the framework, the expression that reflects the distortion of the magnetic field is deduced from the induced current caused by the movement of the turntable in the geomagnetic field. Both the trend and the feasible regions of the three-dimension variables are analyzed. In the structural design example asking for a magnetic field distortion less than 7 nT, a design process of the tri-axial non-magnetic turntable based on the expression is proposed, which reasonably arranges each factor that causes the distortion. The method’s validity is verified by the design result.

Key words: Magnetism, Non-magnetic turntable, Structure design