Linear induction motor door operator

摘要

An elevator car door system for opening and closing elevator car doors (12) in an elevator car includes a high performance linear induction motor having a pair of movable motor primaries (16) attached to a respective door hanger (14) of each door, and a stationary motor secondary (18) attached to a header bracket (20) which is secured to the elevator car. Each motor primary includes a primary winding (24) and a backiron (26) spaced apart by a plurality of spacers (28) that establish a magnetic gap (40) therebetween. The motor secondary fits between the primary winding and the backiron as the moving motor primaries travel across the motor secondary, generating thrust.