ROTOR FOR PERMANENT MAGNET-EMBEDDED ELECTRIC MOTOR, ELECTRIC MOTOR PROVIDED WITH SAME ROTOR, COMPRESSOR PROVIDED WITH SAME ELECTRIC MOTOR, AND AIR CONDITIONER PROVIDED WITH SAME COMPRESSOR

摘要

The purpose of the present invention is to obtain a rotor whereby noise can be further reduced in a permanent magnet-embedded electric motor while suppressing the occurrence of partial demagnetization of the permanent magnet, and to obtain an electric motor that uses the rotor, a compressor that uses the electric motor, and an air conditioner that uses the compressor. Slit holes (14) formed in an axial direction near both end parts of magnetic poles between a magnet insertion hole (9) and the external peripheral surface of a rotor core (6) are provided along the external peripheral surface of the rotor core (6) substantially in an inverted V shape and as mirror-images of each other about the central axes of the magnetic poles, the thickness (B) of permanent magnets (10) being at least twice that of an air gap (A) (B > 2A), the width (C) of a shortest magnetic path (15) in which the distance between the slit holes (14) and the permanent magnets (10) is shortest being at least twice the air gap (A), and the inclination (theta) of the slit holes (14) with respect to the width direction of the permanent magnets (10) orthogonal to the radial direction being in the range of 0-30°.