| 摘要 |
PROBLEM TO BE SOLVED: To provide a stepping motor having low detent torque and high static angle accuracy that can reduce the magnetic interference between stators. SOLUTION: The stepping motor includes stators 20, 30 and a rotor magnet 1. The stators 20, 30 are constructed of: inner yokes 21, 31 and outer yokes 22, 32 so disposed that their multiple pole teeth are engaged with each other; exciting coils 24, 34 attached between the yokes; and cover yokes 40, 50 that cover the outer circumferential surfaces of the exciting coils 24, 34. The rotor magnet 1 is placed coaxially in the center hole penetrating the stators 20, 30 with their inner yokes 21, 31 jointed together, at a gap G from the multiple pole teeth. The rotor magnet 1 has its outer circumferential surface, magnetized alternately in different magnetic poles. The joined inner yokes 21, 31 have: the circular holes 21d, 31d for passing the rotor magnet 1 through their central portions; and annular plates 21b, 31b, whose multiple pole teeth 21a, 31a are disposed substantially perpendicular at constant intervals on the circumferences of the circular holes 21d, 31d. COPYRIGHT: (C)2007,JPO&INPIT
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