SPEED CONTROL SYSTEM OF ELEVATOR USING SPEED FEEDBACK

摘要

PURPOSE: A certain band of speed ripple element is detected affecting vibration of an elevator to compensate current value of a current controller to reduce vibration of the elevator. CONSTITUTION: An elevator speed control system comprises a speed order generator(10) sending speed order in operating elevator. A first calculating member(20) compares rotation speed of a motor from a first interface with the speed order to calculate a deviation value. A speed controller(30) generates a current order according to a deviation value. A second calculating member(40) compares an input current value from the motor through a second interface with the speed order of the speed controller. A current controller generates a certain current according to the compared value. A third interface is provided to compensate the current order of the second calculating member.