| 摘要 |
PROBLEM TO BE SOLVED: To provide a stepping motor which has design flexibility for reducing torque rise, oscillation, and noises easily. SOLUTION: The stepping motor is composed of: a rotor 3, in which the circumferential face of circular permanent magnet 32 is magnetized with N pole and S pole alternately in a perimeter direction and supported pivotally; and two coaxially arranged stators 4, which are installed in an annular state on circumferential side of the rotor and made up of two or more magnetic poles 41 with coil excitation and two or more small teeth 41a facing the rotor with an air gap at the top edge of the magnetic pole. In each stator, all magnetic poles are subjected to excitation simultaneously in a single phase while each adjoining stator has a different phase. Then, the facing position of the corresponding small tooth and the excitation pole of the rotor is formed in deviation with a predetermined pitch between the stators. The rotor is formed as a different object for each corresponding stator and arranged coaxially, and the motor has an excitation configuration, in which adjoining magnetic poles have opposite polarities at the excitation of the magnetic pole of the stator. COPYRIGHT: (C)2009,JPO&INPIT |
