对于焊接过程中常出现各种干扰，焊接条件时有变化的TIG自动焊而言，改进传感方法和控制技术是提高焊缝质量闭环控制系统控制效果的两大途径。

Due to changing welding condition caused by interference in TIG welding process, to improve the sensors and its control is two ways to promote accuracy of closed-loop control of welding quality.

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用TPY3系列调速器对牵引机的速度进行闭环控制，提高线速度的稳定性，从而提高生产效率和产品质量。

TPY3 series speed-adjusting system can realize closed loop control to speed of traction machine, the stability of line speed is increased, so production efficiency and product quality are improved.

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数字化的交流伺服系统是靠软件完成控制计算来支持闭环控制的，它的控制计算程序直接决定了系统的控制质量。

For digitized AC servo system, it needs software to support it's closed-loop control. Its control quality is decided by the program of control computation directly.

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