The Babcock & Wilcox Company

Erik P Kristoffersen

Donald J Dziubakowski

Ronald J Teer

A controller for close positioning or modulating control of an electric motor is disclosed. The controller compares a signal representative of the demand on the system with a signal representative of the actual position of the motor or a valve associated therewith, and if the difference between the signals exceeds a 'deadband' and no action has been taken within a first time interval, and if the last movement of the valve was in the same direction and a second time interval has elapsed, a motor run pulse is generated. If the last movement of the valve was in a direction opposite to that desired, the motor run pulse is extended to overcome 'backlash' resulting from the reversal of motor rotation.

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Cleveland Heights, OH, United States of America

Erik P Kristoffersen