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:
Apr. 24, 2001
Filed:
Dec. 10, 1999
Ronald E. Garnett, Lexington, KY (US);
Mitchell R. Rowlette, Berea, KY (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A low cost, microprocessor (U,) based motor controller (,) for driving a half-wave, multiple speed, reversible, DC brushless motor (,) directly from standard AC 50/60 Hz power. A large number of different speed and rotation direction combinations may be chosen before or after the motor is installed using configuration resistors (R,, R,). SIDACs (TS,, TS,) each serially connected to a diode (D,, D,) are connected across respective coils (COIL,, COIL,) to clamp the flyback energy in the windings to a few volts when triggered and allow Vemf to float when not triggered. The control adjusts the relative phase timing of commutation during start-up and during running to enhance efficiency. Locked rotor protection is provided by limiting start-up time to a selected period which is followed by a selected cool-off time.