Patent ID: 8590137
Filing Date: 2013-11-26
Classification: H02K,Y10T

Abstract:
1. A method of manufacturing a stator including a stator core formed by annularly arranging a plurality of split stator cores each formed by stacking a plurality of unit steel plates, each of the plurality of unit steel plates including a unit yoke portion and a unit stator tooth portion formed to protrude from the unit yoke portion, said split stator cores each including a yoke portion formed by stacking the unit yoke portions of said plurality of unit steel plates and a stator tooth formed by stacking the unit stator tooth portions of said plurality of unit steel plates, comprising the step of: arranging an electromagnetic steel plate between a first die having a hole portion formed in a shape of one of the plurality of unit steel plates and a second die including a projection portion formed in a shape of the one of the plurality of unit steel plates, which can be inserted into said hole portion, forming the one of the plurality of unit steel plates by said first die and said second die, wherein, in a gap between an inner surface of said first die that defines said hole portion and an outer surface of said projection portion, a gap at a part that forms said unit stator tooth portion is larger than a gap at a part that defines a unit circumferential end surface of said unit yoke portion that is located in a circumferential direction of said stator core.