The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 30, 1989
Filed:
Apr. 18, 1988
Toshio Tomite, Katsuta, JP;
Yasuaki Watanabe, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A method of manufacturing an armature of an electric rotary machine comprising the step of: fixedly attaching an armature core to a shaft which is a constituent component of the armature; winding armature coils in slots formed in the outer circumference of the armature core, the lower and upper lead-out portions of the armature coils being axially extended to a commutator arrangement space where a commutator is to be arranged; welding the respective end portions of each pair of the upper and lower lead-out end portions so as to join the upper and lower lead-out end portions in each pair with each other under the condition that the upper and lower lead-out end portions in each pair are arranged vertically one on the other and parallelly to each other while securing concave portions at the welding-joined portions to thereby form each of commutator segment portions; arranging the commutator segment portions in alignment at predetermined intervals circumferentially around the shaft; and molding and fixedly attaching an annular resin-molding body which will be made to be a body of commutator at the commutator arrangement space around the shaft in a manner so that the commutator segment portions are fixedly embedded in the annular resin-molding body, that the outer peripheral portions of the commutator segment portions are exposed from the outer circumference of the annular resin-molding body to enable a commutator brush to slidably contact with the outer peripheral portions of the commutator segment portions, and that the concave portions provided at the welding-joined portions of the commutator segment portions are filled with the resin of the annular resin-molding body.