Importance

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Abstract

A method for determining a lead torque of an elevator system involves: generating control commands controlling an electric motor so that an elevator car coupled to a counterweight performs at least first through fourth test runs, wherein the car is moved from a first to a second position and back in successive runs and is loaded in the third and fourth runs with a weight; during movement of the car receiving current measurement data of current flowing through the motor and height measurement data indicating a height of the car; calculating at least one parameter of a calibration function defining a relationship between the current, the height, and the weight using the measurement data to obtain at least one calibration value; and calculating an adaptation value wherein the counterweight is adapted to be in equilibrium with the car using the at least one calibration value.

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First Claim