Speed Control Based on Analog Value

In a system where a feed roll must run at speeds based on an input voltage, the algorithm to maintain the speed consists of reading the analog voltage connected to one of the analog channels on the motion controller, and updating the speed of the axis based on the value of the voltage read. In this system, the feedback is a normal position sensor, such as an encoder.

Speed Control Based on Analog Feedback Algorithm

The following figure shows the basic algorithm for speed control using based on analog feedback applicable to both C/C++ and LabVIEW code.

The analog input could be connected to a force sensor, which ensures that the tension of a web being fed is maintained.