Patent ID: 6481533
Filing Date: 2002-11-19
Classification: B66B

Abstract:
Means for providing variable frequency alternating current for driving an elevator hoist motor and an elevator door motor, comprising:a controller for controlling the elevator hoist motor to position an elevator car with a hoistway and for controlling the elevator door motor to open and close an elevator door; a single inverter section for receiving alternating current from a supply source and delivering variable frequency, variable voltage driving current in response to a control signal received from the controller; means for switching the variable frequency, variable voltage current delivered by the inverter between the hoist motor or the door motor; and means responsive to a second signal from the controller for causing the switch means to connect the inverter output to either the hoist motor or the door motor individually wherein the controller initiates the second signal upon sensing the elevator car has reached a desired landing, and wherein the controller initiates the second signal upon sensing the elevator car is misleveled to cause the means for switching to connect the inverter to the hoist motor.