STEPPING MOTOR

PROBLEM TO BE SOLVED: To provide a resinous flange part for attachment in an optional position of a mold case and that in optional form, and also to improve its coolability regardless of the position of the resinous flange part. SOLUTION: The outer flanks 32 of the pole teeth 23a and 23b of a stator yoke 22 are exposed to the outer flank 12f of the mold case. The number of pole teeth to be exposed and the arrangement are set in consideration of heat radiation efficiency. In case that the base of the flange part 11 correspond to the outer flank of the pole tooth, the formation area of the base is set in consideration of the attachment strength. Preferably, it should be provided in the mold case such that the base of the flange part straddles the pole tooth. The form and the thickness of the flange part and the form of an opening to be formed in the flange part are set optionally. Moreover, the attachment position of the flange part to the case is optional so far as it is a position in which resin molding is possible. In the case of providing one bearing in a counter equipment to mount a motor, one hand of the bearings is omitted. Moreover, generated heat is radiated from the bearing end face exposed to the outside surface of the mold case via the bearings. COPYRIGHT: (C)2006,JPO&NCIPI