| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling structure for an axial gap electric motor that enables a rotor and a stator to be cooled effectively, while suppressing the deterioration in efficiency as an electric motor. SOLUTION: The axial gap electric motor is made up of the rotor 4, on which a plurality of permanent magnets 1 are provided on a disc-shaped retaining member 2 in the circumferential direction and to a rotating shaft 3 to which the retaining member 2 is coupled, a stator 7 arranged to face the rotor 4 along the center axial line of the rotor 4 and on which a plurality of stator cores 6 wound with coils 5 are arranged in the circumferential direction, and a casing 10 that fixes the stator 7 and supports the rotating shaft 3 freely rotatably. In the cooling structure for this motor, an in-shaft oil passage 11, that extends in the axial direction, is provided inside the rotating shaft 3, and one or more cooling oil passages 13 are provided inside the rotor 4 that communicate with the in-shaft oil passage 11 hermetically for liquid and that have one or more openings 12 which extend outside the radial direction of the rotor. COPYRIGHT: (C)2006,JPO&NCIPI
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