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AssigneeKonecranes Global Corporation
InventorsGabriel Krause, Daniel Kleinwächter, Ralf Pamotat, Torsten Reetz
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A lifting device includes a motor designed as a three-phase asynchronous motor via which the lifting device can be driven to lift and lower a load, and includes a brake resistor via which a power output resulting from a motor generator operation that is carried out when lowering the load at a lowering speed can be converted into heat. The brake resistor is designed for a rated power which is less than the power resulting with a nominal load and a nominal speed. A method for operating a lifting device includes lowering a load at a lowering speed while taking into consideration at least one load capacity characteristic value of the brake resistor for the lowering speed, a threshold is set such that while lowering the load at the lowering speed corresponding to the threshold, the resulting power output is limited to the at least one load capacity characteristic value.
A lifting mechanism for lifting and lowering a load, the lifting mechanism comprising a motor which is designed as a three-phase asynchronous motor and via which the lifting mechanism can be driven in order to lift and lower the load, and comprising a brake resistor via which power resulting from regenerative operation of the motor taking place during lowering of the load at a lowering speed can be converted into heat, wherein the brake resistor is designed for a nominal power that is less than the power resulting with a nominal load and nominal lowering speed.
A method for operating a lifting mechanism for lifting and lowering a load, comprising:
Dependencies are inferred from the claim text.