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:
May. 15, 2001
Filed:
Feb. 11, 2000
Ronald John Krefta, Noblesville, IN (US);
James E. Walters, Carmel, IN (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
An apparatus for determining an incremental angular position of a rotating member of an induction motor. A sensor assembly is positioned adjacent a target wheel attached to the rotating member, the target wheel having a plurality of teeth, separated by slots, angularly spaced around the periphery of the target wheel. The sensor assembly is located proximate the periphery of the target wheel, and includes a plurality of sensors each configured to generate a respective output signal that transitions between first and second states at the passage thereby of each leading and trailing edge of the teeth. The apparatus also includes a processing circuit configured to generate an incremental position signal in response to the output signals. Each sensor is spaced from an adjacent sensor by a predetermined distance equal to 180 degrees divided by n, where n is the number of sensors, and 360 degrees is a tooth-to-tooth distance. The processing circuit has a first mode of operation wherein all of the sensor output signals are used to generate the position signal. The processing circuit also includes a second mode of operation wherein a second number less than all of the output signals are used to generate the position signal. The processing circuit is configured to switch from the first mode to the second mode when the rotating member reaches a predetermined speed.