| 摘要 |
<p>PROBLEM TO BE SOLVED: To lower cogging torque.SOLUTION: A stator core is formed of a plurality of split cores 40. Each split core 40 is formed of: a split annular portion 31a having a split annular shape divided in a circumferential direction; and a tooth 32 extending from a center, in the circumferential direction, of the split annular portion 31a toward an inner side in a radial direction. Each tooth 32 has: a tooth body 51 extending in the radial direction; and protrusions 52 and 53 each extending from a circumferential side portion at an end of the tooth body 51 toward the circumferential direction. Furthermore, auxiliary grooves 54 and 55 are formed at the end of the tooth body 51. Depth H1 of the auxiliary grooves 54 and 55 is equal to or more than end height H2 of the protrusions 52 and 53 which forms a slit 62.</p> |
