| 主权项 |
1. A motor comprising:
a rotating portion configured to rotate about a central axis; a stationary portion positioned around the rotating portion; and a bearing mechanism configured to rotatably support the rotating portion; wherein the rotating portion includes:
a plurality of magnets arranged in a circumferential direction; anda rotor core configured to hold the plurality of magnets, and including flux barriers defined therein, the flux barriers including first flux barrier pairs each of which includes a pair of the flux barriers; the plurality of magnets include two or more magnet pairs; each of the plurality of magnets includes a pair of long sides and a pair of short sides in a cross section perpendicular or substantially perpendicular to the central axis, the pair of long sides being magnetized to have mutually different polarities; within each of the two or more magnet pairs, magnetic poles of a same polarity are positioned circumferentially opposite to each other, and a center line between the pair of long sides of one of the magnets and a center line between the pair of long sides of the other magnet intersect each other at the central axis or at a point between the central axis and the magnet pair in a cross section perpendicular or substantially perpendicular to the central axis; a corner of each of the magnets of each of the two or more magnet pairs, the corner lying on a short-side side closer to the central axis and on a side closer to the other magnet of the magnet pair, is located in a separate one of the flux barriers defined in the rotor core; end points of a boundary between each magnet and a corresponding one of the flux barriers lie on one of the pair of long sides which includes the corner and on one of the pair of short sides which includes the corner or another one of the pair of long sides; the rotor core further includes:
an outer core portion located radially outside of the first flux barrier pairs, each first flux barrier pair adjoining a separate one of the magnet pairs;an inner core portion located radially inside of the first flux barrier pairs; anda joining portion configured to join the outer core portion and the inner core portion to each other between the pair of the flux barriers of each of the first flux barrier pairs; and the joining portion has a minimum circumferential width that is smaller than a length of each short side. |
