Once designed into a system, closed loop fan control can solve the previously described issues. Beat frequencies from slightly out of sync fans are easily eliminated. Precise RPM control also allows ...

Industrial control systems can be categorized in two types: open-loop and closed-loop systems. The open-loop control system is a continuous control system that provides no feedback from its output.

Fig. 5 is a simple block diagram of the desired system. An example of a closed-loop system is the use of a thermistor for temperature feedback, with results shown in Fig. 6 .

Figure 1: Depicted is the power consumption of open loop vs. closed loop stepper systems. Consider a side-by-side comparison of a traditional, open loop step motor system and a fully closed loop ...