US 12,441,587 B2
Method and system for an automatic rescue operation of an elevator car
Juhamatti Nikander, Helsinki (FI); and Janne Salomäki, Helsinki (FI)
Assigned to KONE Corporation, Helsinki (FI)
Filed by KONE Corporation, Helsinki (FI)
Filed on Aug. 10, 2021, as Appl. No. 17/398,559.
Claims priority of application No. 20190488 (EP), filed on Aug. 11, 2020.
Prior Publication US 2022/0048735 A1, Feb. 17, 2022
Int. Cl. B66B 5/02 (2006.01); B66B 1/34 (2006.01); B66B 1/42 (2006.01); B66B 5/16 (2006.01)
CPC B66B 5/027 (2013.01) [B66B 1/3453 (2013.01); B66B 1/3476 (2013.01); B66B 1/42 (2013.01); B66B 5/16 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for an automatic rescue operation of an elevator car in an elevator system, said elevator system comprising a hoisting machine and a battery-operated rescue drive device providing power signals to the hoisting machine and/or hoisting machinery brakes, the method comprising the steps of:
gathering, by a load sensor, elevator car load information; and
selecting based on the elevator car load information, by the rescue drive device, a first rescue run or a second rescue run,
wherein said first rescue run comprises supplying electrical power from a battery of the rescue drive device to an electric motor of the hoisting machine and/or hoisting machinery brakes to initiate movement of the elevator car,
wherein said second rescue run comprises shorting windings of the electric motor of the hoisting machine to apply dynamic braking of the electric motor,
wherein the first rescue run is selected if the elevator car load is within a first range of a rated load of the elevator car, and
wherein the second rescue run is selected if the elevator car load is within a second range of the rated load of the elevator car.