音圈电机驱动小角度转台控制方法研究

Research on Control Strategy of Voice Coil Motor Actuating Small-Angle Turntable

设计了基于相关辨识原理的频率特性测试仪,确定了音圈电机驱动小角度转台的传递函数,辨识出转台中存在的机械谐振环节,设计了相关的补偿环节,改善了转台的相位裕度,消除了中低频段机械谐振的影响。实验结果表明,实验采用的系统辨识方法在中低频段有较高的辨识拟合精度,辨识精度优于0.5 d B;根据辨识传递函数设计的补偿环节,可以使转台的控制角度定位精度达到2″,能够满足高精度的定位需求并具有较强的抗干扰能力。

A frequency characteristic analyzer of the small-angle turntable actuated by the voice coil motor（ VCM） was designed based on the correlation system identification principle. Then,the table transfer function was identified,while the mechanical resonance parts were estimated. At last,the relevant compensator was designed,which was used to improve the phase margin of the table and eliminate the effects of the mechanical resonance parts. It is found from the experiment that this system identification method can reach a relatively high identification precision,which is 0. 5d B in the lower and middle frequency domain. The frequency domain compensation method is with an accuracy of 2＂,which can meet the requirement of high-accuracy angle positioning and stronger disturbance immunity.