| 摘要 |
Disclosed is a rotor comprising a cylindrical rotor core and a perpetual magnet arranged along predetermined polar pitch angles in the peripheral direction of the rotor core when viewed from a sight line that includes the center axis of this rotor core. The rotor core has: an opening formed in the outer circumferential surface of the rotor core and into which the perpetual magnet is inserted; auxiliary-pole-forming grooves formed by a pair of first and second grooves that each extend in the axial center direction on both sides in the peripheral direction of the opening, with the number of grooves matching the number of magnetic poles; an auxiliary pole formed between the first groove and the second groove adjacent to the first groove; and a rib formed between the opening and the auxiliary-pole-forming grooves, in a yoke section of the rotor core. A stress absorbing section is formed in the rib and is made from a thin-walled section thinner than the thinnest part of the yoke section in a cross-section view of a cross-section including the rotor axis center.
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