发明名称 Permanent magnet type three-phase stepping motor
摘要 A permanent magnet type three-phase stepping motor that is simple in construction, with reduced vibration, a reduced unbalanced force in the radial direction, and high torque that can be manufactured at a low cost. The permanent magnet type three-phase stepping motor has a stator and a rotor arranged concentrically with the stator and with an air gap therebetween, said stator having three stator poles, and stator windings of three-phase each wound around each stator pole, each of said stator poles having m pieces of stator pole tooth, said rotor having two split rotor elements, a permanent magnet held between the rotor elements and magnetized so as to form N and S poles in the axial direction thereof, and a plurality (Nr) of small rotor teeth formed at a regular pitch on the outer peripheral surface of each of said rotor elements, said two split rotor elements being circumferentially shifted from each other by a ½ pitch of the small rotor teeth, wherein a pitch of the stator pole teeth is smaller than the pitch of the small rotor teeth, m is an integer and (Nr±2<SUP>k</SUP>)/3, Nr is 3n±1, n is an integer not less than 1, and k is an integer not less than 1 and not more than 4.
申请公布号 US2005194846(A1) 申请公布日期 2005.09.08
申请号 US20050116542 申请日期 2005.04.28
申请人 JAPAN SERVO CO., LTD. 发明人 SAKAMOTO MASAFUMI
分类号 H02K1/27;H02K29/03;H02K37/04;H02K37/14;H02P8/14;(IPC1-7):H02K37/00;H02K21/12 主分类号 H02K1/27
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