| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacture method for a cage rotor, which can reduce the defects of a brazing joint between a ring and a bar. SOLUTION: This is a manufacture method for a cage rotor which brazes the space between a through-hole 7 of a ring 2 and a bar 1. A circular groove 11, which leads to the through-hole, is provided above the through-hole 7 of the end ring 2. When assembling the cage rotor, the bar 1 is brought near the opposite side from the center of the rotor core 3 within the through-hole of the end ring 2 before arrival at brazing temperature, based on the thermal expansion difference between the rotor core 3 and the end ring 2, and also brazing material 4 is arranged within the groove 11 so that it shackles the bar 1, and it is arranged so that the bar may be positioned, after arrival at the brazing temperature, at the roughly center of the through hole 7 of the end ring 2, accompanying the shifting of the through hole 7 of the end ring 2, by the thermal expansion of the end ring 2, thus it is brazed by vacuum radio frequency brazing or brazed by higher intermediate radio frequency brazing under atmospheric gas. COPYRIGHT: (C)2004,JPO&NCIPI
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