Permanent magnet-embedded electrical motor, compressor, and refrigerating air conditioning device

An interior permanent magnet motor, comprising:

• a stator;
• and
• a rotor rotatably arranged so as to be opposed to the stator,
• wherein the rotor comprises a rotor core having a plurality of magnet insertion holes formed therein, into which corresponding permanent magnets are respectively inserted,
• wherein the plurality of permanent magnets and the plurality of magnet insertion holes are each formed into an arc shape that is convex toward a center side of the rotor,
• wherein, when a shortest distance between the adjacent magnet insertion holes is defined as an inter-pole shortest distance (L), a ratio of the inter-pole shortest distance (L) to an outer diameter (D) of the rotor is 0.035≦L/D≦0.045,
• wherein the permanent magnets comprise ferrite magnets, and
• wherein a center of an arc of a radially-inner insertion hole contour surface of the magnet insertion hole and a center of an arc of a radially-outer insertion hole contour surface of the magnet insertion hole coincide with each other.