Elevator door drive using dual secondary linear induction motor

US5736693A · kind A · utility

Assignee

• OTIS ELEVATOR COMPANY · US

Inventors

• Zbigniew Piech · Cheshire, US
• Jerome F. Jaminet · South Windsor, US
• Thomas M. Kowalczyk · Farmington, US
• Edward E. Ahigian · Arlington Heights, US
• Richard E. Kulak · Bristol, US
• Thomas M. McHugh · Farmington, US
• Thomas He · Unionville, US
• Richard E. Peruggi · Glastonbury, US
• David W. Barrett · Hartland, US

Key dates

• Filing date: Sep 25, 1995
• Grant date: Apr 7, 1998
• Expiry date: Sep 25, 2015

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E05Y2900/104
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A linear induction motor utilizes a double-sided primary and a dual secondary to directly drive an elevator car door open and closed. The invention has the advantage of being compact: all magnetic-attractive loads are confined to a primary mount bracket, and all thrust loads are carried directly by the car header, not transferred to the cab. Also, high thrusts can be developed from a small space, i.e., short net working coil area, due to the double-sided primary winding and dual secondary arrangement. The configuration is basically simple, with a low moving mass and easy-to-fabricate parts, the primary core being particularly easily wound.