Re: [CAD_CAM_EDM_DRO] replacing servo motor help >signal phase

In a message dated 1/20/2006 12:24:11 PM Eastern Standard Time,
elson@... writes:
Yes, I can think of several things (both mechanical and electrical) that
could
make the phase shift close enough to call it 180 degrees. Without extensive
laboratory gear, measuring the phase shift of an encoder is a very difficult
thing to do, so this "exactly" part is likely meaningless. And, commercial
encoders not built for ICBM inertial guidance won't give a 90 degree shift,
either. You are lucky to get the waveform to be within +/- 10 degrees of
true 90 degree quadrature on encoders costing less than $300 - 400.

Jon
Jon is correct, most industrial encoders are not all that accurate with
regards to the phase shift. The controllers will often accept phase shifts that
are as much as +/- 20% off


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