| 摘要 |
PURPOSE:To lower temperature at a bearing part by sucking in a low temperature air through a cooling duct around a motor by means of two cooling vanes and cooling said motor. CONSTITUTION:A cooling vane 12A is fixed to a motor shaft 4 between a casing 13 and a motor 17, and a cooling vane 12B is fixed to the motor shaft 4 on the opposite side to the cooling vane 12A across the motor 17. A cooling duct 7 has an opening part 9 on the cooling vane 12A side while having an inlet part 10 on the cooling vane 12B side. By rotating the cooling vanes 12A, 12B, air at the inlet part 10 of the cooling duct 7 is sucked in to cool the motor 17, and is discharged out of the opening part 9. Thereby, temperature at a bearing part can be greatly lowered.
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