The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 23, 1976
Filed:
Oct. 29, 1974
John C Moore, Tulsa, OK (US);
Lowrance Electronics, Inc., Tulsa, OK (US);
Abstract
A sonar flasher motor speed control for driving a D.C. electric motor from a varying voltage source. A rotating magnet and coil system generates a first voltage pulse once each revolution of the motor. A capacitor charged through a series resistor in combination with transistor means controlled by the first voltage pulse to generate a ramp voltage once each cycle. The ramp voltage is compared with a reference voltage by means of a voltage comparator, which generates a control second voltage pulse, whenever the ramp voltage exceeds the reference voltage. Transistor amplifier means responsive to said second voltage pulse increases the motor current during the second pulse so as to maintain the speed of the motor relatively constant.