Method of making an interlocked core spaced for anneal penetration

Abstract

A process and apparatus for manufacturing lamina stacks used to form rotor or stator cores for electric motors. In the process of forming a plurality of blanked lamina, a blanking and stacking machine forms dimples in the laminas prior to coaxially stacking the laminas. The lamina may also include interlocking portions so that the lamina stack may be interlocked. The dimples are located at offset positions relative to adjacent laminas to cause the laminas of the stack to be spaced apart. The spaced apart stack may be subject to annealing which relieves metal stress in the stack and causes the formation of a desired non-conductive layer on the surfaces of the laminas. The annealed lamina stack may then be compressed to bring the laminas into abutting relation to be subsequently manufactured into rotor or stator cores.

Dependencies are inferred from the claim text.