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用微处理机来实现现代控制面临一个巨大困难:其控制算法需要花费大量重复计算的时间。美国在探索把最优控制转化为次优控制,并用微处理机实现这种控制方面取得了初步成功。这种控制大大减少控制算法时间。下面通过实例加以说明。图1是一个用 Intel 8080微型计算机并通过18个可控硅整流器组成的循环换流器控制异步电动机速度变化的框图。系统的数学模型如下:
A tremendous difficulty with modern microprocessors is that their control algorithms take a lot of time to double-calculate. The United States has made initial success in exploring ways to transform optimal control into suboptimal control, and using microprocessors to achieve such control. This control greatly reduces the control algorithm time. The following examples to illustrate. Figure 1 is a block diagram of the speed control of an asynchronous motor using a cycloconverter consisting of 18 silicon controlled rectifiers with an Intel 8080 microcomputer. The mathematical model of the system is as follows: