MOVING APPARATUS FOR A LOAD

摘要

A moving apparatus for a load has a speed control circuit and a torque control circuit, each circuit controlling a motor for lifting the load. When operation of the speed control circuit is stopped, the torque control circuit stores the value of the torque which is equal to the weight of the load and keeps the torque from the motor at a constant value in response to the weight of the load. In this way, the load can be moved as if it were located in a gravity-free state.