Commutator, electric motor, and method for manufacturing commutator
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsKeisaku Nakano, Kenji Kondo
Life of this patent
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Abstract
Commutator of the present invention includes electrically conductive part, resin part, ceramic part, first mixing part and second mixing part. First mixing part contains an electrically conductive material and a ceramic material in mixture. In first mixing part, a content of the electrically conductive material decreases and a content of the ceramic material increases from electrically conductive part toward ceramic part. Second mixing part contains the ceramic material and the resin material in mixture. In second mixing part, a content of the ceramic material decreases and a content of the resin material increases from ceramic part toward resin part.
Claims12
A commutator formed in a cylindrical shape along an axial center, the commutator comprising, in a direction orthogonal to the axial center:
- an electrically conductive part which is situated on an outer periphery side of the commutator, and contains an electrically conductive material and in which a plurality of commutator pieces are formed to extend from an outer periphery surface of the commutator toward an opposite side of the axial center;
- a resin part which is situated on an inner periphery side of the commutator, and contains a resin material;
- a ceramic part which is situated between the electrically conductive part and the resin part, and contains a ceramic material;
- a first mixing part which is situated between the electrically conductive part and the ceramic part, and contains the electrically conductive material and the ceramic material in mixture and in which a content of the electrically conductive material decreases and a content of the ceramic material increases from the electrically conductive part toward the ceramic part;
- and
- a second mixing part which is situated between the ceramic part and the resin part, and contains the ceramic material and the resin material in mixture and in which a content of the ceramic material decreases and a content of the resin material increases from the ceramic part toward the resin part.
Dependencies are inferred from the claim text.