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A Quick Guide To Selecting Encoders and Other Feedback Devices

Worldwide applications use feedback for speed and/or position control. Feedback’s important role in the machine is to make sure that the machine delivers performance, precision, and accuracy. The following presents guidelines on how to select feedback for an application.

A feedback sensor must be capably of measuring the correct control variable ie speed, direction, position, with sufficient resolution. In general, guidelines suggest resolution 10 times higher than the specified accuracy of the variable being monitored. Feedback is usually mounted on the motor; however some applications use feedback directly on the load. This introduces mechanical play and dead times. A high quality control should be used to allow for compensation of these potential situations.