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选择合适的数字控制器和采样周期是设计数字控制系统的关键。这里,从最少拍系统出发,提出了数字控制器相应的选择条件,并根据采样系统零、极点与采样周期的关系,相应得出几种判别被控对象脉冲传递函数零点全部分布在单位圆内的方法,指出如何从系统性能角度与采样定理一起来选择采样周期。在确定了采样周期后,就可选定数字控制器。
Choosing the right digital controller and sampling period is the key to designing a digital control system. Here, from the least-beat system, the corresponding selection conditions of the digital controller are proposed. According to the relationship between zero and pole of the sampling system and the sampling period, several conclusions are obtained that all zero points of the pulse transfer function of the controlled object are all distributed within the unit circle , Pointing out how to choose the sampling period together with the sampling theorem from the perspective of system performance. After determining the sampling period, you can select the digital controller.