Rotor core, rotor, and rotary electric machine

A rotor core comprising a soft magnetic material portion formed using a soft magnetic material, and having at least one magnet hole per one pole, wherein:

• the magnet hole has, relative to a permanent magnet installed through the magnet hole, a space serving as a front-side flux barrier and a space serving as a rear-side flux barrier on both sides in a left-right direction perpendicular to a magnetization direction of the permanent magnet and a direction parallel to a rotation axis line serving as a center of rotation;
• the space serving as at least one flux barrier, of the space serving as the front-side flux barrier and the space serving as the rear-side flux barrier, has an open end portion opened in an outer peripheral surface of the rotor core;
• in a cross section perpendicular to the rotation axis line, the front-side flux barrier is on a front side in a rotation direction of the rotor core than the rear-side flux barrier;
• in the cross section, a position of an open-end front-side corner portion of at least one of the open end portions provided in a same pole of a rotor is on a rear side in a rotation direction of the rotor core further than a reference position relative to the magnet hole having the open end portion;
• in the cross section, the open-end front-side corner portion is a corner portion on a front side in the rotation direction of the rotor core, of two corner portions in a circumferential direction of the rotor core, of at least one of the open end portions provided in the same pole of the rotor;
• in the cross section, the reference position relative to the magnet hole having the open end portion is a position at an intersection point of a straight line passing through a permanent-magnet reference end portion which is one of end portions of the permanent magnet at a position closest to the open end portion in the permanent magnet installed through the magnet hole, and the rotation axis line, and, the outer peripheral surface of the rotor core;
• in the cross section, the permanent-magnet reference end portion of the permanent magnet at the position closest to the open end portion is, of end portions of the permanent magnet, an end at a position at a farthest distance in the circumferential direction from a straight line passing through a central position in the circumferential direction of a region of one pole including the permanent magnet, and the rotation axis line;
• and
• the distance in the circumferential direction from a straight line passing through the central position in the circumferential direction of the region in one pole including the permanent magnet at the position closest to the open end portion, and the rotation axis line is a distance defined on a side, of the front side and the rear side in the rotation direction of the rotor core, in which the open end portion is present.