Patent ID: 6351096
Filing Date: 2002-02-26
Classification: B66B

Abstract:
In a control apparatus for an escalator comprising:a power rectifier for converting a three-phase AC utility power into an AC power of variable voltage and variable frequency in order to control the operation speed of the escalator, a gear and a sprocket for running a footplate using rotatory force generated from the induction motor, and a current detector for detecting a current flowing in the induction motor, to an operation control apparatus for an escalator, comprising: a speed detector for detecting the rotational speed of the induction motor; a position detector for detecting the rotational position of the sprocket; and a control device which drives the power rectifier by obtaining a vibration torque compensating current from an output signal of the speed detector and the position detector, adding the above current to an output current of a speed controller, subtracting an actual current detection value of the induction motor from the resultant current value, and accordingly generating a pulse width modulation signal.