公开(公告)号：US20130093268A1

公开(公告)日：2013-04-18

申请号：US13650833

申请日：2012-10-12

申请人： Minebea Motor Manufacturing Corporation

发明人： Hiroshi SANO ,  Taketoshi OHYASHIKI ,  Makoto KINOSHITA ,  Katsutoshi SUZUKI ,  Osamu NAKAMURA

IPC分类号： H02K37/14

CPC分类号： H02K37/14 ,  H02K1/02 ,  H02K2213/03

摘要： A stepping motor uses a low-cost ferrite magnet instead of an expensive rare-earth magnet. The stepping motor has characteristics equivalent or superior to those of a conventional stepping motor. The stepping motor is provided with a rotor 300, a stator yoke 200, and bearings 501 and 502 which rotatably hold the rotor 300 with respect to the stator yoke 200. The rotor 300 has a columnar shape and has plural magnetic poles arranged in the circumferential direction of the outer circumferential surface. The stator yoke 200 has an outer cylindrical portion and an inner circumferential portion which surrounds the rotor 300 and which has plural first pole teeth and plural second pole teeth. The outer diameter “d” of the rotor 300 and the outer diameter “D” of the stator yoke 200 are set so that the ratio of “d/D” is greater than 0.6.

摘要翻译： 步进电机使用低成本铁氧体磁体代替昂贵的稀土磁体。 步进电动机具有与常规步进电动机相当或优于其特征的特征。 该步进电动机设置有转子300，定子磁轭200以及可相对于定子磁轭200可转动地保持转子300的轴承501和502.转子300具有圆柱形状并且具有设置在周向上的多个磁极 外周面的方向。 定子线圈200具有外圆筒部和围绕转子300的内周部，并且具有多个第一极齿和多个第二极齿。 转子300的外径“d”和定子磁轭200的外径“D”被设定为使得“d / D”的比率大于0.6。