Electric motor with controllable mechanical wear and spark generation

摘要

A small electric motor having a plurality of commutator arcuate segments equally spaced in the direction of angular position on the rotating shaft of motor rotor, wherein conductive grease is coated on the commutator arcuate segments and the equally spaced gaps, and edges provided on the sliding portions of brushes are caused to press and contact the commutator by cutting the conductive grease film.