Patent ID: 8413318
Filing Date: 2013-04-09
Classification: H02K,Y10T

Abstract:
1. A method for manufacturing an armature core, wherein 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 comprising: guiding a steel plate along a first direction, the steel plate having at least first areas and second areas that have a predetermined width and extend in a second direction perpendicular to the first direction, wherein the first areas and the second areas are alternately arranged along the first direction; simultaneously punching a plurality of first core pieces from each first area; simultaneously punching a plurality of second core pieces from each second area; preparing a plurality of sets of the split cores, each set having three split cores, so as to form one armature core, the three split cores in each set being formed by a plurality of core pieces that have been punched by the same part of the same punching die and have the same shape; and arranging the three split cores in each set at intervals of 120° in the circumferential direction, the three split cores arranged at intervals of 120° in the circumferential direction having the same shape.