Permanent-magnet dynamo-electric machine and compressor using the same

A permanent magnet type dynamoelectric machine comprising:

• a stator including teeth wound with an armature winding;
• a rotor disposed on an inside of the stator via a gap;
• a plurality of magnet insertion holes formed in the rotor;
• and
• a permanent magnet disposed in each of the plurality of magnet insertion holes, wherein
• when a magnetic flux axis of the permanent magnet is represented as a d axis and an axis orthogonal to the d axis in an electrical angle is represented as a q axis, the rotor is formed such that a concave section recessed to an inner circumference side is formed on the q axis and a gap between the concave section and the tooth is larger than a gap between an outer circumferential section and the tooth of the stator on the d axis,
• the concave section is formed in a substantially trapezoidal shape and formed such that an opening degree θp2 at left and right both ends on an outer circumference side is large with respect to an opening degree θp1 at left and right both ends on an inner circumference side, and the opening degree θp2 is set within a range of approximately 60 degrees in the electrical angle, and
• a slit is not formed near the d axis on the outer circumference side of the permanent magnet insertion hole and a plurality of slits are formed on left and right both sides a predetermined distance or more apart from the d axis.