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1. (WO2017198669) LIFTING DEVICE AND METHOD FOR OPERATING A LIFTING DEVICE

Pub. No.:    WO/2017/198669    International Application No.:    PCT/EP2017/061737
Publication Date: Fri Nov 24 00:59:59 CET 2017 International Filing Date: Wed May 17 01:59:59 CEST 2017
IPC: B66C 13/28
Applicants: KONECRANES GLOBAL CORPORATION
Inventors: KRAUSE, Gabriel
KLEINWÄCHTER, Daniel
PAMOTAT, Ralf
REETZ, Torsten
Title: LIFTING DEVICE AND METHOD FOR OPERATING A LIFTING DEVICE
Abstract:
The invention relates to a lifting device (1a) for lifting and lowering a load (L), comprising a motor (2), which is designed as a three-phase asynchronous motor and by means of which the lifting device (1a) can be driven in order to lift and lower the load (L), and comprising a brake resistor (6) by means of which a power output (P) resulting from a motor (2) generator operation that is carried out when lowering the load (L) at a lowering speed (v) can be converted into heat. The brake resistor (6) is designed for a rated power (P0) which is less than the power (Pmax) resulting with a nominal load and a nominal speed. The invention further relates to a method for operating a lifting device (1a), wherein while lowering a load (L) at a lowering speed (v) while taking into consideration at least one load capacity characteristic value (P0/t0, P1/t1, Pm/tm) of the brake resistor (6) for the lowering speed (v), a threshold (vmax) is set such that while lowering the load (L) at the lowering speed (v) corresponding to the threshold (vmax), the resulting power output (P) is limited to the at least one load capacity characteristic value (P0/t0, P1/t1, Pm/tm).