Patent ID: 8059381
Filing Date: 2011-11-15
Classification: B66C

Abstract:
1. A control system for a lifting magnet, comprising: a positive current input; a negative current input; a first current sensor configured to measure current provided to the positive current input; a bridge circuit comprising a plurality of switches; a transient voltage suppressor provided to the bridge, wherein the transient voltage suppressor is connected in parallel with said bridge circuit; a first output for providing current to an electromagnet; a second output for providing current to the electromagnet; and a logic controller configured to control the plurality of switches such that current flows from the positive current input to the first output of the electromagnet, the logic controller further configured to control the plurality of switches such that current flows through the transient voltage suppressor, the logic controller further configured to control the plurality of switches such that current flows from the positive current input to the second output of the electromagnet.