H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/93
H02P 7/29 (2006.01)
Patent
CA 1143785
ANALOG DC MOTOR VELOCITY CONTROL LOOP Abstract of the Disclosure A pulse width modulated DC motor control system is designed to operate a DC motor at constant velocity. Feedback pulses generated at a rate proportional to the rotational velocity of the motor are converted to control pulses having a fixed on-time period which is independent of changes in the velocity of the motor. The control pulses are used to modulate a constant current source whose output is integrated to generate a sawtooth voltage signal whose average DC value is used as the basis for pulse width modulating a DC voltage applied to the motor drive circuits of a DC motor. EN977026
335624
Arnold Robert W.
Galetto Louis V.
Gowling Lafleur Henderson Llp
International Business Machines Corporation
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