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本文介绍利用变频器、测速机和其它电子元件实现异步电动机的速度闭环控制，提出了速度闭环调节器的设计方法。此外，本文还介绍了利用HDH－100型电流互感器实现电动机的电流检测，并用于电动机的力矩控制和过电流保护。
This article describes the use of frequency converter, tachometer and other electronic components to achieve asynchronous motor speed closed-loop control, the design of the speed closed-loop regulator design. In addition, this article also describes the use of HDH-100-type current transformer motor current detection, and used for motor torque control and over-current protection.