slip rings

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mickeyrench

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edison, n.j.
we have 2 slip rings we have change inthe last 2 months . we use a vfd on 1hp 3phase motors. neither vfd use vfd cable to the motors [200'plus]. each slip ring had a hole burned into the slip ring track the brushes follow. slip ring is rated for 35 amps. i don't know if the vfd has the motors overloads set into it. could the vfd have damage the cluch on the shaft . i have heard of shaft currents and was thinking if that could be a cause. thak you for any help
 
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