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:
Feb. 12, 1985
Filed:
Jun. 09, 1983
Ricky F Bitting, Raleigh, NC (US);
William Peil, No. Syracuse, NY (US);
Thomas A Brown, Fulton, NY (US);
William K Guzek, Liverpool, NY (US);
General Electric Company, Fort Wayne, IN (US);
Abstract
The invention discloses a control circuit for an electronically commutated motor which performs essential internal commutation and control functions and responds to external controls, usually user operated. The invention is embodied in a ceiling fan which is subject to controls over motor speed or torque and direction of rotation. The control circuit uses a differential transconductance amplifier, which is periodically balanced, for commutation timing, and control logic, which includes a bidirectional counter, designed for uniformity in count duration, irrespective of the count, direction of counting, or changes in direction of counting, and a five rank decoding structure which selects the unenergized winding stage for sensing, selects the energized winding stages for suitably sensed energization, and responds to both direction and energy controls. The internal control includes circuit protection when power is first turned on. The invention also includes an integrated circuit having the foregoing features and a novel method of operating an electronically commutated motor.