Patent ID: 7360630
Filing Date: 2008-04-22
Classification: B66B

Abstract:
1. An elevator position compensation system for positioning an elevator car in an elevator shaft, the elevator car suspended in the shaft by an elevator cable system and elevator motor, the elevator position compensation system comprising: (a) an elevator load sensor device for determining the weight of the elevator car and generating a load signal indicative of the determined weight; (b) an elevator position sensor for determining the position of the elevator car in the elevator shaft and generating a position signal indicative of the determined elevator car position; and (c) an elevator control system adapted to receive the load signal and the position signal, wherein the load signal and position signal are processed by the control system in order to calculate a change in the cable system length associated with a load change in the elevator car, and wherein the calculated change in the cable system length is compensated by the elevator motor when the elevator car is at a landing prior to an actual load change.