Rotor of electric rotating machine

A rotor of an electric rotating machine, comprising:

• a shaft rotating around a rotation axis;
• a rotor core fixed to the shaft and having a plurality of poles;
• and
• a plurality of permanent magnets arranged for the respective poles of the rotor core and having a rectangular shape as viewed from a direction of the rotation axis,
• wherein
• when a circumferential center of one of the poles of the rotor core is referred to as a pole center and both ends in a circumferential direction are referred to as pole ends, the plurality of permanent magnets include:
• two first permanent magnets arranged in line symmetry with the pole center, with second ends opposite to first ends in a longitudinal direction, with respect to the first end in the longitudinal direction as viewed from the rotation axis direction being located outside in a radial direction, and arranged gradually away from the pole center while extending from the first ends towards the second ends;
• and
• two second permanent magnets arranged in line symmetry with the pole center, with fourth ends opposite to third ends in a longitudinal direction with respect to the third end in the longitudinal direction as viewed from the rotation axis direction being located outside in a radial direction, and arranged gradually away from the pole center while extending from the third ends towards the fourth ends,
• the two second permanent magnets are arranged so as to allow the third ends to be located more closely to the shaft side than the first ends of the two first permanent magnets and the fourth ends to be located more closely to the pole end side than the second ends of the two first permanent magnets, and
• when an angle between first side surfaces in a short direction of the two first permanent magnets, opposite to the second permanent magnets, as viewed from the rotation axis direction is referred to as θ1 and an angle between second side surfaces in the short direction of the two second permanent magnets, on the first permanent magnet sides, is referred to as θ2, the angles θ1 and θ2 are set to satisfy:
• θ1>θ2 and
• 70 degrees≤θ2≤110 degrees,
• wherein
• the angles θ1 and θ2 are set to satisfy:
• 70 degrees≤θ2≤90 degrees,
• first hollows extending from the second ends of the first permanent magnets toward a peripheral surface side are formed and second hollows extending from the fourth ends of the second permanent magnets toward the peripheral surface side are formed, in the rotor core, and
• when an intersection of a straight line which is parallel to the second side surface of the second permanent magnet and is in contact with the second hollow on a side closest to the first permanent magnet, and a circumcircle of the second hollow centered on the rotation axis is referred to as X, when a shortest distance between the intersection X and the first hollow is referred to as L1, and when a shortest distance between the first permanent magnet and the second permanent magnet is referred to as L2, each of the shortest distances L1 and L2 is set to satisfy:
• 0.85≤L2/L1≤1.03.