Permanent magnet buried type electric motor and compressor

A permanent magnet buried type electric motor, comprising:

• a rotator including a rotator core including a plurality of laminated constituent sheets;
• and
• a stator arranged so as to surround the rotator,
• the rotator core comprising:
• a plurality of magnet accommodating holes formed as many as a number of poles along a circumferential direction;
• a plurality of permanent magnets accommodated in the plurality of magnet accommodating holes;
• air hole portions serving as paths for allowing a coolant and a refrigerant oil to pass therethrough;
• fastening holes for fastening the plurality of laminated constituent sheets,
• each of the plurality of magnet accommodating holes being formed into a shape that projects toward a radially inner side of the rotator core and is recessed toward a radially outer side thereof,
• the plurality of air hole portions and the plurality of fastening holes being arranged in the circumferential direction of the rotator core so as to be alternately positioned,
• the air hole portion being formed into such a shape that includes a portion extending in an arc shape along an outer peripheral surface of the rotary shaft in the circumferential direction of the rotator core so that an area of the air hole portion is larger than an area of the fastening hole, and
• wherein when a spread angle of the air hole portion in the circumferential direction is represented by θ1 and a pitch of a corresponding pair of the magnetic poles is represented by θ2, θ1≧θ2 is established.