TRUE BACK EMF SERVO CONTROLLER
Original Publication Date: 1989-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
The idea of a Back EMF servo, or speed control system is well know. There are many different circuits for this type of controller, but all use the same general principal to keep a DC motor at constant speed, independent of the torque the motor has to deliver. A speed torque curve is familiar, and shows that the motor will indeed slow down with load.