STATOR CORE AND ROTARY MOTOR USING THE SAME

PROBLEM TO BE SOLVED: To provide a rotary motor that reduces cogging torque.SOLUTION: A stator core 100 is used in an inner-rotor rotary motor. Each of a plurality of core pieces 10 has: a plurality of slots 16, and a plurality of teeth, that are formed on an inner circumferential side thereof; and a plurality of welding grooves 18 that are formed substantially at even intervals on an outer circumferential side thereof. The core pieces 10 are laminated in a thickness direction, and the corresponding welding grooves 18 are welded and fixed together. N is an aliquant part of P, and a common multiple of an aliquot part of S, where: N is the number of the welding grooves 18; P is the number of magnetic poles of the rotary motor; and S is the number of the slots 16 of the stator core 100.