Patent ID: 7202615

Claim:
A method for allowing for control of elevator mounted tubular linear synchronous motor doors comprising the steps of: inputting a position control profile ( 40 ) to a master-slave control circuit ( 50 ); measuring an actual master position ( 53 ) of a master door having a master status; providing as an input to said master door said position control profile ( 40 ); comparing said measured actual master position ( 53 ) to said position control profile ( 40 ) to compute a master position error ( 51 ); using said computed master position error ( 51 ) to calculate a master electrical force ( 57 ); transmitting said calculated master electrical force ( 57 ) to said master door; recomputing said actual master position ( 53 ); providing as an input said actual master position ( 53 ) to a slave door having a slave status; measuring an actual slave position ( 54 ) of said slave door; comparing said measured actual slave position ( 54 ) to said inputted actual master position ( 53 ) to compute a slave position error ( 52 ) using said computed slave position error ( 52 ) to calculate a slave electrical force ( 58 ); transmitting said calculated slave electrical force ( 58 ) to said slave door; and switching the status of said slave door and said master door when an absolute value of said slave position error ( 52 ) exceeds a predefined threshold.