| 摘要 |
A commutator comprising a commutator sleeve molded of a material having a mechanical and thermal strengths, a plurality of circumferentially arranged spaced commutator segments made out of a conductive ring blank by cutting the outer peripheral surface of said conductive ring blank and secured to the outer peripheral surface of said commutator sleeve, and an insulating material filling the gap between the adjacent ones of said segments, said insulating material being of such character that it can be cut more easily than the conductive ring blank and can be worn off more readily than the same, so that the surface of said insulating material in the commutator is slightly sagged from the surfaces of the adjacent segments after the outer peripheral surface of the conductive ring blank has been cut to separate the segments and is maintained in that state during rotation of the commutator.
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