公开(公告)号：US20140111884A1

公开(公告)日：2014-04-24

申请号：US14052022

申请日：2013-10-11

Applicant: MINEBEA CO., LTD.

Inventor： Hideaki SHOWA ,  Ryoichi KUROSAWA ,  Hironobu TSUGE

IPC: G11B19/20 ,  H02K1/12

CPC classification number: G11B19/2009 ,  H02K1/146 ,  H02K21/22 ,  H02K2201/09 ,  H02K2213/03

Abstract: A thin spindle motor having a stator core with sufficient swaging strength even using thin magnetic steel sheets is provided, whereby the magnetic loss and the power consumption of the spindle motor are reduced. The stator core is formed by laminating plural stator laminations with a thickness of 0.1 to 0.2 mm and joined by a swaging portion. The swaging portion has an approximately rectangular shape having long sides extending along a radial direction when viewed from an axial direction. The swaging portion has a cross section with a middle portion parallel to the radial direction and a slope portion at the both sides when viewed from a circumferential direction, thereby forming a recess. The recess has a depth that is less than the thickness of the stator lamination whereby the swaging portion does not cut the stator lamination.

Abstract translation: 提供了一种具有即使使用薄的电磁钢板也具有足够的模锻强度的定子芯的细主轴电动机，由此减小了主轴电动机的磁损耗和功率消耗。 定子铁芯通过层压多个0.1〜0.2mm的定子叠片而形成，并通过型锻部分连接。 模锻部具有从轴向观察时具有沿径向延伸的长边的大致矩形形状。 该锻模部具有从圆周方向观察时具有平行于半径方向的中间部分的中间部分和两侧的倾斜部分的横截面，从而形成凹部。 该凹部的深度小于定子层压体的厚度，由此，型锻部不切断定子层叠体。