Peter Homann wrote: > Jon, > > I believe that there is an encoderless technique that uses the hall effect > sensors and reading the back emf. > > Maybe that's what's being talked about. > Yes, certainly brushless motors are are used in non-positioning applications, and have extremely coarse position resolution without an encoder. That would not be of any use in a precision positioning application like a machine tool, so some form of encoder is needed, either on the motor or the machine tool.
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