Commutator rounding brush

Details Commutator rounding brush Commutator rounding brush

1976-08-05

1977-07-05

Goldberg, Gerald

Electrical generator or motor structure

Dynamoelectric

Rotary

310228, H02K 1300, H01R 3956

Patent

active

040342492

ABSTRACT:
An electrical contact brush having interposed in a central longitudinal slot an abrasive element which frictionally contacts the commutator surface at crests where the radius of curvature of the commutator is less than that of a concave contact surface preformed at the distal end of the brush but which does not contact the commutator at valleys where the radius of curvature of the commutator is greater than that of the brush contact surface, said element in operation mechanically reducing the average radius of the commutator at a rate faster than the rate at which the commutator surface is electrically eroded, thereby tending to maintain a true cylindrical commutator surface with uniform wear characteristics.

REFERENCES:
patent: 1807794 (1941-06-01), Munday
patent: 2105038 (1938-01-01), Helwig
patent: 2656475 (1953-10-01), Diehl et al.
patent: 2739255 (1956-03-01), Shobert et al.
patent: 2918591 (1959-12-01), Lyddon
patent: 3173045 (1965-03-01), Oliver et al.
patent: 3358166 (1967-12-01), Nolan
patent: 3392295 (1968-07-01), Sebok

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