Metal-graphite brush and motor including a metal-graphite brush

摘要

A metal-graphite brush for supplying electricity to a coil wound around a core provided at a rotor of a motor is made of sintered material having porosities at a surface of, or inside, the sintered material. The metal-graphite brush is infiltrated by a liquid containing a plurality of kinds of glycol ether having varying numbers of alkylene oxide structure units. The liquid has a boiling point higher than that of water.