Control machines with your machine
This article is intended for new Linux users who wish to use their Linux-box for some real work. Speed control of an industrial motor? Sounds complicated? It’s not as complex an affair as it sounds. What’s interesting is that a PC powered with a Linux based Real-Time Operating System (RTOS) can be used to control anything from a small motor to a complex industrial drive with the utmost reliability.
This article presents the implementation of a Digital PI (Proportional+Integral) Controller on a PC running RTAI (Real Time Application Interface). A system developed on Linux-2.4.24 kernel patched with RTAI-3.1 was used for the speed control of a 12V DC motor.
Control systems
Control systems can be broadly divided into two: open loop systems and closed loop systems. Systems which do not automatically correct the variations in their output are open loop systems. This means that the output is not fed back to the input for correction.
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