Patent ID: 7205697
Filing Date: 2007-04-17
Classification: H02K

Abstract:
1. A claw-pole PM stepping motor comprising: a housing; a rotary shaft inserted in an inner portion of the housing and rotatably supported by the housing; a main yoke member having mutually opposite protrusive first and second claw-poles and internally disposed so as to substantially divide an inner space of the housing; and first and second driving units each comprising sub-yoke members respectively having claw-poles each corresponding to the first and second claw poles of the main yoke member, the sub-yoke members each comprising a bigger part and a smaller part in diameter and being symmetrically disposed at the rotary shaft with respect to the main yoke member; magnet rotors each press fitted into the rotary shaft so as to be respectively located in a space of the housing between the main yoke member and the bigger part of the sub-yoke members; and coil bobbins each coaxially coupled to the smaller part of the sub-yoke members and wound with coils.