Patent ID: 8701270
Filing Date: 2014-04-22
Classification: H02K,Y10T

Abstract:
1. A method of making a squirrel cage rotor, the method comprising; providing a laminated steel stack having a plurality of substantially longitudinal slots formed therein; forming a plurality of conductor bars in the plurality of substantially longitudinal slots, each conductor bar being made of a high conductive material and having opposing first and second ends extending beyond the laminate steel stack; coating the first ends, or the second ends, or both of the plurality of conductor bars with aluminum, aluminum alloys, a latent exoergic coating, or combinations thereof; placing the laminated steel stack with the plurality of conductor bars in a casting mold having cavities for a pair of end rings on opposite ends of the laminated steel stack, wherein the first and second ends of the plurality of conductor bars extend into the cavities; and filling the cavities with aluminum, aluminum alloys, aluminum composites, or combinations thereof and casting the pair of end rings; wherein the plurality of conductor bars and the end rings are made of different materials.