High speed? Not yet.

A project log for Motor as Encoder

Inspired by the attempts of other people around the Interwebs, I use a motor as a rotary encoder, but with a different approach.

besenyeimbesenyeim 09/14/2018 at 13:380 Comments

I didn't post this screenshot previously (didn't seem important), but it shows the problem with high speed.

I set higher frequency scanning and spun the thing by hand with a speed that's unusually fast for a knob. The graph shows how the rotor slows down after that. Note how the pattern is changing by time. Not just amplitude but the shape too. The EMF distorts the signal so much, my simple algorithm can't recognize the changes. That's why I mentioned in the project details that an advanced method is needed for this case.