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Hmmm, No expert here, but years ago I had a couple of machines that used resolvers. If I recall they were not like encoders as they did not have a pulse output, but rather they had a two or three phase AC output and the PLC (old Giddings & Lewis) had special resolver modules. My understanding was that the controls compared the phase differences to "resolve" the rotational position of the device. I mainly remember what a pain they were to keep calibrated. I always thought they were pretty "old school" technology.


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