Measuring the angle of large diameter shafts

摘要

There are many devices for measuring shaft angle. Potentiometers are simple and low cost, but are not suitable for harsh environments or continuous rotation. Resolvers are reliable even in tough conditions but their high cost, weight and bulk mean that they are restricted to 'high spec' applications. Optical encoders are not as robust as resolvers but are widely available, keenly priced and are often the automatic choice for engineers. of the primary shaft is required, then additional reduction gearing or a multi-turn encoder can be used.