Patent ID: 6552451
Filing Date: 2003-04-22
Classification: H02K

Abstract:
A stepping motor comprising a stator having a plurality of stator poles and a rotor disposed to oppose the stator poles with a space therebetween, the rotor having rotor pole teeth disposed with a predetermined pitch P1 and the stator poles having stator pole teeth opposed to the rotor pole teeth, wherein:each of stator poles is provided with n sets of tooth groups, each group consisting of the stator pole teeth in the number of m, a pitch P2 of the stator pole teeth in the tooth groups meets the following formula: â€ƒP2â‰ P1,and a pitch P3 of the tooth groups meets the following formulas:P3â‰ mÂ·P2P3â‰ mÂ·P2where, P1, P2 and P3 denote electrical angles, and m and n are integers of 2 or more, thus reducing harmonics of a plurality of orders within each of the stator poles.