INTERIOR PERMANENT MAGNET ELECTRIC MOTOR, COMPRESSOR, AND REFRIGERATING AND AIR-CONDITIONING DEVICE

摘要

An interior permanent magnet electric motor (1) is equipped with a rotor (5) having a plurality of permanent magnets (19) and a stator (3). The rotor is equipped with a rotor iron core. The rotor iron core has a plurality of magnet insertion holes (21). The permanent magnets are inserted into the respective magnet insertion holes. The magnet insertion holes are each formed in a shape protruding toward the center side of the rotor. The magnet insertion holes each have a hole inside line (53), a hole outside line (55), and a pair of hole side-lines (57). The hole outside line includes a pair of recess portions (61) at the ends thereof. The depth of the recess portions is 10-40% of the thickness of the permanent magnets.