PERMANENT MAGNET MOTOR AND COMPRESSOR, VENTILATOR, AND FROZEN AIR CONDITION DEVICE USING SAME

摘要

To obtain a permanent magnet embedded motor capable of attaining further magnetism reinforcement. The outer circumferential surface of a rotor 2 is formed by a plurality of divided outer circumferential surfaces 10 divided at equal angle intervals in the circumferential direction to correspond to permanent magnets 3. The divided outer circumferential surface 10 is formed by a first curved surface 11, a radial direction distance of which from the axis of the rotor 2 is maximized in the circumferential direction center of the divided outer circumferential surface 10, formed from the circumferential direction center to the circumferential direction both ends and second curved surfaces 12, a radial direction distance of which from the axis of the rotor is minimized at the circumferential direction both ends of the divided outer circumferential surface 10, formed from the circumferential direction both ends to the circumferential direction center and crossing the first curved surface 11. The second curved surfaces 12 are formed by, in a part or all of sections extending from the circumferential direction both ends toward the circumferential direction center of the divided outer circumferential surface 10, arcuate surfaces having the axis of the rotor as the central axis. A distance between both ends of the first curved surface 11 is set smaller than the width of the permanent magnets 3 in a direction orthogonal to the radial direction in the circumferential direction center of the divided outer circumferential surface.