Molded commutator with a layer of insulation on the base
AssigneeAsmo Co., Ltd.
InventorsHiromitu Ibe, Yoshimichi Shirai
Life of this patent
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Abstract
An improved commutator for an electric motor and a method of making the same wherein the outer surface of a commutator sleeve molded of a synthetic resin is coated with an insulating coating layer of an electrically insulating coating material. The molded commutator sleeve thus coated is protected from oxidative degradation and cracking which would otherwise result in removal of a commutator bar and insulation failure.
Claims6
A commutator comprising a plurality of commutator bars formed of an electrically conductive material and firmly supported by and around a commutator sleeve molded of a synthetic resin, with insulating air gaps defined between adjacent ones of the commutator bars, the molded commutator sleeve having opposite side faces and a central bore extending through the sleeve from one of said side faces to the other for accommodating an armature shaft, an insulating coating layer of an electrically insulating coating material covering an exposed surface of the commutator sleeve, the insulating coating layer including a first portion covering a peripheral surface of the central bore of said molded commutator sleeve, and second portions contiguous to the first portion and covering the opposite side faces of the molded commutator sleeve.
Dependencies are inferred from the claim text.