Asmo Co., Ltd.

Kenji Yoshimura

Shinji Ikeda

Toshio Ishikawa

Keisuke Sasaki

Shingo Matsuoka

A method for manufacturing an armature core is provided, in which a plurality of split cores, which are formed by laminating core pieces produced through punching by punching dies, are coupled together to form an annular shape as a whole, so as to manufacture one armature core. The method includes: preparing a plurality of sets of the split cores, each set having three split cores, so as to form one armature core; and arranging the three split cores in each set at intervals of 120&#xb0; in the circumferential direction. The three split cores in each set are formed by core pieces that have been punched by the same part of the same punching die.

Method for manufacturing armature core

A brush-less motor has a center piece, which has a flange portion fixed to a motor holder and a cylindrical portion fixed to a stator core at the outer periphery of the cylindrical portion. The cylindrical portion has a pair of bearings disposed inside the cylindrical portion to rotatably support said shaft. The center piece is formed by a pressing machine to omit a finishing machine work.

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Toyohashi, Japan

Kenji Yoshimura