METHOD OF SYNCHRONIZING A PLURALITY OF BRUSHLESS MOTORS IN LIFT

摘要

PROBLEM TO BE SOLVED: To enable smooth rise and fall by accurately synchronizing a plurality of motors of lifting means, in a lift where lifting means are arranged in a plurality of positions and small motors are arranged for drive in the plurality of lifting means. SOLUTION: A plurality of brushless motors are utilized as the motors of lifting means. Individual brushless motors M1-M4 have RUN or STOP signals issued by synchronous operation circuit. The RUN or STOP signal is materialized by comparing the pulse signal corresponding to the rotation of each brushless motor with those of others, and stopping the brushless motor of the pulse signal concerned when it is larger than the pulse signal of other brushless motors.