| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that the flow speed of cooling gas drops to degrade cooling efficiency of a motor, since the flow speed vector of the gas exhausted from a cooling fan of a totally enclosed fan-cooled motor has a component in radial direction as well as the component in circumferential direction, the flow speed vector deflected in the direction along the surface of a frame by a fan cover also has the component parallel to a plate-like heat radiation fin as well as the component in vertical direction, and the component in vertical direction to the heat radiation fin of the flow speed vector interferes with the heat radiation fin to cause a significant pressure loss. SOLUTION: The totally enclosed fan-cooled motor comprises a frame 3 that encloses a stator, a plurality of heatsinks 31 provided on the outer peripheral surface of the frame, a cooling fan 8 attached to the rotating shaft protruding outside the machine, and a fan cover 9 which deflects the airstream energized by the cooling fan to the direction along the outer peripheral surface. The heatsink has a pin shape. COPYRIGHT: (C)2009,JPO&INPIT
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