调平机构部分，用三相混合式步进电机替代原有的交流电机，位置反馈部分，用编码器替代高精度电位器，这样构成了一个半闭环系统。
About the mechanism of adjusting crossbeam balance, the three-phase blend stepping motor take the place of the A. C. motors, the coder as a feedback device, then make up of a closed-loop system.
调平机构部分，用三相混合式步进电机替代原有的交流电机，位置反馈部分，用编码器替代高精度电位器，这样构成了一个半闭环系统。
About the mechanism of adjusting crossbeam balance, the three-phase blend stepping motor take the place of the A. C. motors, the coder as a feedback device, then make up of a closed-loop system.
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