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:
Sep. 15, 1998
Filed:
Sep. 25, 1995
Richard E Peruggi, Glastonbury, CT (US);
Thomas M McHugh, Farmington, 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, Hartland, CT (US);
Zbigniew Piech, East Hampton, CT (US);
Otis Elevator Company, Farmington, CT (US);
Abstract
An electronic motor drive produces a required motion profile for an elevator door operator actuated by a three-phase, line-powered linear induction motor (LIM) by means of an array of TRIAC switches producing selected forces from the LIM. The TRIAC drive is capable of producing acceleration, deceleration or free coast in either the open or close direction of door operation. When controlled by an algorithm such as a 'time-optimal switch point' or 'bang-bang' control, the TRIAC drive produces the required motions from the linear induction motor for elevator door operation. The motor windings may be switchable between delta and wye hookups to provide two distinct thrust levels. Phase angle modulation may be used to provide finer control of thrust. The linear motor may be a 12-slot arrangement having four poles and three phases and arranged with flux emanating from the stationary primary (on the car) to a stationary backiron part of the secondary also mounted on the car, wherein the flux passes through a movable copper part of the secondary attached to the elevator door and passing between the primary and the backiron.