Rotor core, rotor, and rotating electric machine

摘要

A rotor core according to an embodiment includes a pair of magnet openings disposed such that a space therebetween widens toward an outer peripheral side and in which a pair of permanent magnets having a magnetic pole direction relative to a radial direction identical to each other are inserted. The magnet openings each have a shape that connects together a first opening portion formed along the profile of the corresponding permanent magnet and a second opening portion that, when the permanent magnet is inserted in the first opening portion, covers, out of corner portions of the permanent magnet, a corner portion closest to the other permanent magnet with an air gap defined therebetween. The second opening portion forms a bridge portion between the second opening portion and the second opening portion of the other magnet opening.

主权项

1. A rotor core comprising:
a plurality of pairs of magnet openings formed in juxtaposition with each other in a circumferential direction, the pair respectively disposed such that a space therebetween widens toward an outer peripheral side and in which a pair of permanent magnets having a magnetic pole direction relative to a radial direction identical to each other are inserted; and cavity portions, each being formed relative to an area sandwiched between two magnet openings, out of the magnet openings, in which the permanent magnets that are mutually adjacent and that have magnetic pole directions relative to the radial direction opposite to each other are inserted, wherein the magnet openings each have a shape that connects together a first opening portion formed along a profile of the corresponding permanent magnet and a second opening portion that, when the permanent magnet is inserted in the first opening portion, covers, out of corner portions of the permanent magnet, a corner portion closest to the other permanent magnet with an air gap defined therebetween, the second opening portion forms a bridge portion between the second opening portion and the second opening portion of the other magnet opening, and the area is defined by a virtual line that connects together points in the two magnet openings disposed at extreme ends on an outer peripheral side, a virtual line that connects together points in the two magnet openings disposed at extreme ends on a rotation center side, and the two magnet openings.