Title:
PERMANENT-MAGNET ELECTRIC MOTOR, COMPRESSOR, AND AIR-CONDITIONER
Document Type and Number:
WIPO Patent Application WO/2017/163383
Kind Code:
A1
Abstract:
A rotor core 4 of the permanent-magnet electric motor has inner surfaces that form magnet holes for disposing permanent magnets 6 therein, and each of the inner surfaces has a first surface that is disposed on the outer side in a radial direction and second surface that is disposed on the inner side in the radial direction. The first surface has multiple grooves 9a1 through 9a5, and the second surface has multiple grooves 9b1 through 9b4. In addition, the permanent magnet 6 has a third surface that faces the first surface and a fourth surface that faces the second surface. The third surface has multiple portions 6a1 through 6a5 that are exposed to the multiple grooves 9a1 through 9a5. The fourth surface has multiple portions 6b1 through 6b4 that are exposed to the multiple grooves 9b1 through 9b4. In a cross-section of the rotor core 4 perpendicular to an axial direction, the total length of the multiple grooves 9a1 through 9a5 is longer than the total length of the multiple portions 6b1 through 6b4.
Inventors:
BABA KAZUHIKO (JP)
Application Number:
PCT/JP2016/059476
Publication Date:
September 28, 2017
Filing Date:
March 24, 2016
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H02K21/14; H02K21/18
Domestic Patent References:
| WO2014068753A1 | 2014-05-08 |
Foreign References:
| JP2002345188A | 2002-11-29 | |||
| JP2013093956A | 2013-05-16 |
Attorney, Agent or Firm:
TAKAMURA, Jun (JP)
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