| 摘要 |
PROBLEM TO BE SOLVED: To provide the temperature adjustment structure of an electric motor capable of enhancing cooling efficiency, while suppressing the electric motor from being enlarged in size. SOLUTION: A case 9 accommodating the stator 2 of the electric motor 1 and a rotor 5 is equipped with a plurality of first cooling flow passages 24 having substantially a circular cross-section which are arranged substantially in parallel with each other at an interval, and with second cooling flow passages 25 which are arranged in substantially parallel with each other between the first cooling flow passages 24 and are formed smaller in diameter than the first cooling flow passages 24. This enables the second cooling flow passages 25 to be extended by using the space created by the first cooling flow passages 24, resulting in improving the cooling efficiency of the electric motor 1 while preventing the electric motor 1 from being enlarged in size. COPYRIGHT: (C)2006,JPO&NCIPI
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