slip ring
Definitions
Cars & Driving
- noun in an alternator, the rings that form a rotating connection between the armature windings and the brushes
Electronics
- A conductive rotating ring which works in conjunction with one or more stationary brushes, in order to maintain a continuous electrical connection. Used, for instance, in an AC generator. Also called collector ring.
http://www.dictionarycentral.com/definition/slip-ring.html