PERMANENT MAGNET BURIED TYPE ELECTRIC MOTOR AND COMPRESSOR

摘要

A permanent magnet buried type electric motor includes a rotator having a rotator core and a stator. The rotator core includes: a plurality of magnet accommodating holes formed as many as the number of poles; a plurality of permanent magnets; air holes through which a coolant and a refrigerant oil pass; and a fastening hole. The magnet accommodating hole is formed into a shape that projects toward a radially inner side and is recessed toward a radially outer side. The air hole portions and the fastening holes are arranged so as to be alternately positioned. The air hole portion is formed into such a shape that includes a portion extending in an arc shape along an outer peripheral surface of a rotary shaft in a circumferential direction of the rotator core so that an area of the air hole portion is larger than an area of the fastening hole.

主权项

1. 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, andwherein 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.