METHOD OF REDUCING ELECTRICAL NOISE OF COMMUTATOR MOTOR

摘要

PROBLEM TO BE SOLVED: To reduce electrical noise due to arc generated between a commutators 4 and brushes, and particularly, electrical noise generated upon the end of the arc. SOLUTION: Graphite layers or alloy layers of graphite with a material having a higher conductivity than graphite 2 and 3 are formed on at least one of the side surfaces along a rotational direction of the commutators 4.