slipring

slip ring

noun Electricity.
a metal ring, usually of copper or cast iron, mounted so that current may be conducted through stationary brushes into or out of a rotating member.

Origin:
1895–1900

slip-ring, adjective
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World English Dictionary
slip ring
 
n
electrical engineering a metal ring, mounted on but insulated from a rotating shaft of a motor or generator, by means of which current can be led through stationary brushes into or out of a winding on the shaft

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