Electric motor for equipment on road vehicle - has brushes with shape that allows automatic alignment of tip with commutator profile

摘要

The motor has carbon brushes (30) that have a rectangular cross section and fit within a guide or brush holder (36). The tip of the brush has a concave surface with a radius that matches that (33) of the commutator (34). The brush is produced with parallel side walls hat are set at an angle to the axis of the radius of the tip. When spring force is applied (32) the brush flows through the angle to provide accurate alignment of the tip with the commutator. USE/ADVANTAGE - For windscreen wipers. Reduces brush noise in motors.