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

摘要

A permanent magnet embedded electric motor includes a stator core (8) disposed inside the frame (6) and having a back yoke (8c) and a plurality of magnetic pole teeth (8d); a rotor (22) disposed on an inner diameter side of the plurality of magnetic pole teeth (8d); and a plurality of compression sections in which compression stress higher than compression stress occurring in the back yoke (8c) due to pressing force generated between the frame (6) and the back yoke (8c) occurs. A compression section group (180) having a set of two or more compression sections (18-1) and (18-2) of the plurality of compression sections is disposed on an outer circumferential section (8a) of the stator core which is an outer circumferential section of the back yoke (8c) corresponding to each of the plurality of magnetic pole teeth (8d). A sum of the rotating direction widths (A1 and A2) of the plurality of compression sections (18-1 and 18-2) constituting the compression section group (180) is smaller than a radial direction thickness (B) of the frame (6).