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. 28, 1997
Filed:
Sep. 25, 1995
Thomas M McHugh, Farmington, CT (US);
Richard E Peruggi, Glastonbury, CT (US);
Edward E Ahigian, Arlington Heights, IL (US);
Jerome F Jaminet, South Windsor, CT (US);
Thomas He, Unionville, CT (US);
Thomas M Kowalczyk, Farmington, CT (US);
Richard E Kulak, Bristol, CT (US);
David W Barrett, East Hartford, CT (US);
Otis Elevator Company, Farmington, CT (US);
Abstract
A linear motor for operating an elevator door is energized using a bang-bang control strategy (10) wherein three-phase AC utility mains (16) are connected (29) directly to the linear motor primary (14) by means of a motor control (12) in response to control signals (26) provided under the direction of a control strategy (10), which may be microprocessor-based. Commands (24) from an elevator controller to open/close the elevator door cause the system to operate the doors and a sensor (22) provides feedback (28) by means of which the control (10) is able to determine switch points for switching the AC mains.