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Permanent magnet buried type electric motor and compressor

  • US 9,899,897 B2
  • Filed: 12/21/2012
  • Issued: 02/20/2018
  • Est. Priority Date: 12/21/2012
  • Status: Active Grant
First Claim
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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,each of the plurality of magnet accommodating holes having an inner defining line that projects toward the radially inner side of the rotator core,the plurality of air hole portions and the plurality of fastening holes being arranged on a same radius with respect to the center of the rotator core and 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,wherein when a spread angle of the air hole portion in the circumferential direction is represented by θ

    1 and a pitch of a corresponding pair of the magnetic poles is represented by θ

    2, θ

    1≧

    θ

    2 is established, andwherein the air hole portion is formed into such a shape that includes a protruding portion toward the radially outer side of the rotator core, and a portion extending along the inner defining line of the magnet accommodating hole in the circumferential direction of the rotator core.

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