Re: [CAD_CAM_EDM_DRO] Re: Question on Power Supply - regulated notes

In a message dated 6/9/2005 11:36:23 AM Eastern Standard Time, KM6VV@...
writes:
Now on servos it's obvious that there is EMF. We actually drop the drive
from a motor (small peristaltic pump) for a short bit of time in order to
measure the back EMF, and use it to control the speed (servo loop).
Actually, if the servos are DC brush type, older typical design, there is a
separate "Tachometer" unit that generates X volts per Xrpms and that is how the
speed is measured and controlled, not by dropping off the power to the motor.

Randy A.


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