随着自动化的不断发展,机械化的需求也在急剧增加,对于大多数的控制系统,速度调节与改变的要求不断增大。如何对控制系统中包括电机等的速度调节与保护成为自动化建设中的重中之重。 As automation continues to evolve, the demand for mechanization is also steep, and the demands on speed regulation and change for most control systems continue to grow. How to control the speed of the system including motor regulation and protection has become the top priority in the automation.