PERMANENT MAGNET EMBEDDED MOTOR AND COMPRESSOR, BLOWER, AND REFRIGERATING AND AIR CONDITIONING APPARATUS USING PERMANENT MAGNET EMBEDDED MOTOR

摘要

A permanent magnet embedded motor includes a rotor and permanent magnets. The outer circumferential surface of the rotor is formed by divided outer circumferential surfaces divided at equal angle intervals in a circumferential direction corresponding to permanent magnets. The divided outer circumferential surface is formed by a first curved surface, a radial direction distance of which from a rotor axis is maximized in a circumferential direction center of divided outer circumferential surface and second curved surfaces formed from the circumferential direction both ends to the circumferential direction center and crossing the first curved surface. The second curved surfaces are formed by arcuate surfaces each having the rotor axis as a central axis. A distance between both ends of the first curved surface is smaller than the width of a permanent magnet in a direction orthogonal to a radial direction in the circumferential direction center.

主权项

1. A permanent magnet embedded motor comprising:
a stator in which a plurality of teeth sections, around which stator winding is wound, are arranged in a circumferential direction at equal angle intervals via slot sections; and a rotor in which a plurality of permanent magnets are embedded at the equal angle intervals in the circumferential direction, the rotor being rotatably held on an inner circumferential surface of the stator, wherein an outer circumferential surface of the rotor is formed by a plurality of divided outer circumferential surfaces divided at the equal angle intervals in the circumferential direction to correspond to the permanent magnets, the divided outer circumferential surface is formed by:
a first curved surface, a radial direction distance of which from an axis of the rotor is maximized in a circumferential direction center of the divided outer circumferential surface, formed from the circumferential center to circumferential direction both ends; andsecond curved surfaces formed from the circumferential direction both ends to the circumferential direction center of the divided outer circumferential surface by a substantially fixed arcuate surface having the axis of the rotor as a central axis and crossing the first curved surface, a radial direction distance between the arcuate surface and the inner circumferential surface of the stator being larger than a radial direction distance between the first curved surface and the inner circumferential surface of the stator, and a distance between both ends of the first curved surface crossing the second curved surface is smaller than width of the permanent magnets in a direction orthogonal to a radial direction in the circumferential direction center of the divided outer circumferential surface.