Method and apparatus for controlling a lifting magnet of a materials handling machine
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United States of America Patent
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Nov 15, 2011
Grant Date -
Aug 19, 2010
app pub date -
Apr 8, 2010
filing date -
Jun 1, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A magnet controller supplied by a DC generator controls a lifting magnet. Four transistors, forming an H bridge, allow DC current to flow in both directions in the lifting magnet. During “Lift”, full voltage is applied to the lifting magnet. During “Drop”, reverse voltage is applied briefly to demagnetize the lifting magnet. At the end of the “Lift” and the “Drop”, most of the lifting magnet energy is returned to the DC generator. A transient voltage suppressor protects against voltage spike generated when current reverses in the generator.
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