| 摘要 |
<p>A stepping motor (10), comprising a rotor (3) formed of a permanent magnet (2) having multiple poles magnetized in circumferential direction and two or more stator yokes (5a, 5b) disposed on the outer periphery of the rotor (3) and forming a multiple-phase field of two or more phases, wherein the cross sections of the portions of the stator yokes leading to a magnetic pole surface (51a) is reduced less than the areas of the stator yokes on the magnetic pole surface (51a) or an intermediate magnetic substance (9) magnetically independent of the stator yokes (5a, 5b) on both sides thereof is disposed so as to reduce the detent torque of the stepping motor, and a stator yoke (5) is formed of two-divided members and both divided members (51, 52) are connected to each other inside a winding bobbin (7) so as to increase the quality and the workability of assembly.</p> |
