| 摘要 |
PURPOSE:To reduce windage loss of a rotor by covering the outer peripheral surface of a rotor core or the end of a winding at the outer peripheral surface of the rotor core and the axial outside of the rotor core with an insulating cylindrical resin tube, thereby smoothening the outer peripheral surface in the circumferential direction. CONSTITUTION:A plurality of axial winding slots 12 are formed on the outer peripheral surface of a rotor core 10 which is secured to a rotational shaft 9. A rotor winding 16 is filled in the slot 12 through slot insulating paper 15 and a slot wedge 13. Then, varnish is insulated such as immersed and treated with a core 10, a winding end 11, an insulating slot wedge 14. Thereafter, a thin insulating cylindrical resin tube 17 is coated on the core 10 and the winding end 11. The tube 17 employs thermally shrinkable tube or the like. Thus, the resin tube is coated on the surface of the rotor to obtain the smoothness in the circumferential direction, thereby reducing the rotor windage loss under the motor rotating condition. |
