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:
Nov. 18, 2003
Filed:
Jul. 27, 2000
Applicant:
Inventor:
Tan Du, Plano, TX (US);
Assignee:
Texas Instruments Incorporated, Dallas, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 1/46 ; H02P 3/18 ; H02P 5/28 ; H02P 1/36 ;
U.S. Cl.
CPC ...
H02P 1/46 ; H02P 3/18 ; H02P 5/28 ; H02P 1/36 ;
Abstract
The invention includes a method and apparatus for detecting the position of a stationary rotor in a polyphase electric motor. The method includes providing one or more short duration voltage pulses to the motor and determining the rotor position based on measurements of one or more phase voltages. The invention allows identification of a region in which the rotor is positioned, through polarity sensing, whereby the rotor position may be quickly and accurately determined, to allow a stationary electric motor to be properly energized to rotate in a desired direction.