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:
Oct. 20, 1998
Filed:
Mar. 03, 1997
Eric K Jamieson, Farmington, CT (US);
Daniel S Williams, Meriden, CT (US);
Otis Elevator Company, Farmington, CT (US);
Abstract
A fault sensor to be used with a controller as part of an active roller guide (ARG), the fault sensor disabling the ARG if it determines that any pair of current-force magnitudes for any of the ARG actuators is outside of a predetermined acceptable operating envelope, indicating an anomalous, or fault, condition. The ARG fault sensor receives, periodically, magnitudes of current and flux density for each actuator. From these, it calculates an actuator force and then checks that the current-force pair for each actuator is within the operating envelope. This envelope is curvilinear in its boundary. To check the curved segments of the envelope boundary, the fault sensor calculates the gap for each actuator. If each gap magnitude is within range, all that is left is to check the straight segments of the envelope boundary. This is done by simply checking that each actuator current and force magnitude is less than a predetermined limit.