| 摘要 |
PROBLEM TO BE SOLVED: To enhance the manufacture property by enabling coils to be fitted easily on magnetic pole teeth, and yet, to lessen the occurrence of cogging torque in low speed range and vibration or noise in low speed range. SOLUTION: Protrusions 6 and 6 are made in advance at the tip of each magnetic pole tooth 5 of an unfolding core 1 where a plurality of unit cores 2 are severally coupled with one another by united couplings 3. A coil 7 which is constituted by winding a magnet wire 9 on a spool 8 is set on each of the magnetic teeth 5, and then the coil 7 is so fomed as to narrow the width dimension of the fitting hole 10 of that coil 7. After this, the unfolding core 1 is rolled up, and unit cores 2 at both ends are joined with each other.
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