US Patent 7748502 Elevator apparatus

In an elevator apparatus, a single car is raised and lowered by a plurality of hoisting machines. An elevator control device for controlling the hoisting machines generates speed commands separately for the hoisting machines. When a current value of one of the hoisting machines reaches a current set value, which is set in advance during acceleration of the car, the elevator control device applies the speed command for that one of the hoisting machines, whose current value has reached the current set value, to the other hoisting machine as well.