A null-balance system is provided by balancing the magnetic forces by electrostatic forces. 零位平衡系统是靠静电力来平衡磁力而造成的。
The briachial-bridge luffing mechanism and curve slideway live control weight gravity balance system are the core technology. 臂桥架变幅系统和曲线滑道活对重自重平衡系统是其核心技术。