CONTROL DEVICE FOR LIFTING MAGNET
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United States of America Patent
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Sep 5, 2019
app pub date -
Jun 16, 2017
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Aug 2, 2016
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Abstract
When at least one of a value a detected output current to a magnet and a magnet load defined by the following formula (1) 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 . . . (1); in which excitation ratio: excitation time/(excitation time+non-excitation time); I: value of the output current; V: voltage applied to a lifting magnet.
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