When at least one of a value a detected output current to a magnet and a magnet load defined by the following formula is equal to or larger than a threshold value predetermined for the value of the detected output current or a threshold value predetermined for the magnet load, a controller constituting a control device outputs, to a control circuit, a command to decrease voltage applied to the magnet from next attracting operation. Magnet load=excitation ratio×I×V . . . ; wherein excitation ratio: excitation time/(excitation time+non-excitation time); I: value of the output current; V: voltage applied to a lifting magnet.
Control device for lifting magnet
2021-04-13
Patent
Elektronische Ressource
Englisch
LIFTING MAGNET CONTROL SYSTEM AND LIFTING MAGNET CONTROL METHOD
Europäisches Patentamt | 2022
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