Importance

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Abstract

A current transfer brush which contains a sliding member is composed of graphite foils which are disposed in a stacked arrangement, at least some of which graphite foils are partially coated with an electrically conductive material. At least one thin mat or felt of highly graphitized graphite fibers is coated with an electrically conductive material and interposed between ajacent ones of the graphite foils in the stack. The interposition of such a graphite mat or felt produces a substantial reduction in the brush fire and brush abrasion which results when the brush is placed in electrical contact with a rotating contact member, such as a slip ring or a commutator, of an electric machine. The friction between the current transfer brush and the rotating contact element may be reduced in some embodiments by coating the graphite fibers in the graphite mat or felt with a friction reducing material.

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First Claim