| 摘要 |
PURPOSE:To prevent an insulation from decreasing by forming a tapered shape so that a coil conductor side reduces in diameter when forming a vent hole in an insulating spacer interposed between a coil conductor and a wedge, thereby eliminating the adherence of a copper dust. CONSTITUTION:Coil conductors 4 are laminated in a slot, and a wedge 6 is mounted in the slot through an insulating spacer 5A. Vent holes 9, 10A, 11 which are directed radially of a rotor are respectively formed at the conductors 4, the spacer 5A and the wedge 6. In this case, the hole 9 formed at the spacer 5A has a small diameter at the conductor 4 side, and is formed in a tapered shape having a large diameter at the wedge 6 side. Thus, since no step is formed at the vent holes, copper dusts are not adhered, but the insulating strength of the spacer 5A can be held. |
