| 摘要 |
PURPOSE:To obtain a rotor having high conductivity without crack by disposing plates having a melting point lower than the molten metal for conductor to be cast and the same shape as a laminated core planewise at both ends of laminating direction of the core and filling molten metal in the slot of the core. CONSTITUTION:Before molten metal layer is filled in molds 2, 3, cushion plates 4, 5 are respectively disposed at both ends in laminating direction of a laminated core 1. Thereafter, molten metal is filled in the space formed by the molds 2, 3, the core 1 and the plates 4, 5, thereby forming end rings 6, 7 and a bar 8. In this case, the plates 4, 5 are semi-molten or completely molten by the heat of the molten metal filled in the space, and no external force is applied to the end rings 6, 7 which are solidified slowly and the bar 8 having small sectional area, and a crack can accordingly be effectively prevented. |
