System for control and deceleration of elevator during emergency braking
AssigneeKone Corporation
InventorsBrad Helstrom, Don Afman, John Weber
Life of this patent
Estimating the term…
Abstract
A system for controlling the braking of an elevator car during an emergency. When there is a power failure or other emergency, a brake is applied to slow the elevator car to a stop in a controlled fashion. By Controlling the braking, the car is stopped in a short time but without discomfort to the passengers. The controller receives inputs from the rope movement, motor movement, temperature and the braking current to correctly determine the amount of braking which should be applied.
Claims19
A braking system for an elevator comprising:
- a braking surface connected to a lifting apparatus for an elevator;
- a brake for engaging said braking surface to stop said elevator;
- a brake controller for applying an actuating signal to said brake, said brake controller acting in an emergency to actuate said brake to stop said elevator according to a desired deceleration profile by comparing said deceleration profile to a signal indicating car movement to determine a desirable speed change.
A method for braking an elevator car in an emergency comprising:
- determining an emergency condition;
- providing a braking signal from a brake controller to a braking device;
- applying said braking device to slow said elevator according to a desired deceleration profiles,
- wherein said brake controller compares a decelerating profile with cable movement to produce a desired speed signal.
A braking apparatus for stopping an elevator, comprising:
- an elevator car;
- a cable system connected to said elevator car;
- a sheave around which said cables pass to lift said elevator car;
- a motor for driving said sheave;
- a braking surface;
- a brake pad for engaging said braking surface to stop said sheave;
- a brake driver for forcing said brake into engagement with said braking surface;
- and
- a brake controller for applying a signal to said brake driver to control the deceleration of said elevator car,
- wherein said brake controller includes a deceleration profile for comparing a desired deceleration curve with a signal indicating movement of said cable to produce a desired speed signal.
Dependencies are inferred from the claim text.