H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/99
H02P 7/28 (2006.01)
Patent
CA 1301241
Abstract of the Disclosure A circuit for controlling the speed of a DC motor pro- vides delay and sampling means in the feedback loop to delay the triggering of the SCRs driving the DC motor and measures the motor armature voltage during the period of the delay, thereby eliminating errors in the armature motor voltage caused by the SCR motor excitation. Alternatively, the current to the motor is measured to generate a pulse output for initiating an interval dur- ing which the measured armature voltage is sampled and transmitted to a summator for generating an error signal controlling application of power to the DC motor whereupon the aforesaid interval is terminated upon receiving a pulse indicative of power application to the DC motor.
606429
Kotzur Frank W.
Rosenkranz Thomas H.
Gowling Lafleur Henderson Llp
Reelex Packaging Solutions Inc.
LandOfFree
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