This article introduces the frequency speed constant pressure water supply system controlled by PLC, presenting its hardware structure, the design of PLC program and its application.
介绍了用PLC控制的变频调速恒压供水系统的基本原理，给出了系统的电气线路和PLC程序设计，并在实际中得到了应用。
Stepper motor is a motor controlled by digital signal, which converts pulse signal into Angle displacement. The wheeling speed is controlled by the frequency of pulse signal.
步进电机是一种数字控制电机，它将脉冲信号转变成角位移，电机的转速由脉冲信号频率决定。
In the new scheme the speed sensor of general slip frequency vector controlled system is replaced with speed calculation algorithm, so it has the merit of wide applicability.
这一新的控制方案用速度推算算法取代常规转差频率矢量控制系统中的速度传感器，具有适用性广的优点。
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