Electricity: motive power systems – Positional servo systems – With stabilizing features
Patent
1986-12-09
1988-05-03
Dobeck, B.
Electricity: motive power systems
Positional servo systems
With stabilizing features
318561, G05B 501
Patent
active
047422840
ABSTRACT:
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.
REFERENCES:
patent: 3961234 (1976-06-01), Chambers
patent: 4325014 (1982-04-01), Jeck
patent: 4335341 (1982-06-01), Ogasawara
Dziubakowski Donald J.
Kristoffersen Erik P.
Teer Ronald J.
Dobeck B.
Edwards Robert J.
Matas Vytas R.
The Babcock & Wilcox Company
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