| 摘要 |
PURPOSE:To improve cooling efficiency of coil end portions and reduce vibration and make the coil end portions compact, by a method wherein a cooling fan with inner diameter side projecting towards the rotating direction is provided within a draught gap between thc coil end portions, and draught passage is constituted at outer diameter side of the cooling fan. CONSTITUTION:Tip at inner diameter side of an insulation spacer 15B interposed between coil end portions 9b is curved towards the rotating direction of arrow indication, and a cooling fan is formed to blow cooling air between the coil ends accompanying the rotation. A draught hole 15a penetrating in the rotating direction is formed at outer diameter side of the insulation spacer 15B thereby passage for cooling air flowing between the coil ends is constituted. In this constitution, cooling efficiency of the coil end portion 9b is improved, vibration caused by thermal expansion is reduced, and the coil end portions are made compact. |
