Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2005-04-12
2005-04-12
Arbes, Carl J. (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S596000, C219S076130, C228S002100, C228S112100, C310S049540, C310S211000, C310S212000
Reexamination Certificate
active
06877210
ABSTRACT:
A method of making a squirrel cage rotor of copper material for use in AC or DC motors, includes forming a core with longitudinal slots, inserting bars of conductive material in the slots, with ends extending out of opposite ends of the core, and joining the end rings to the bars, wherein the conductive material of either the end rings or the bars is copper. Various methods of joining the end rings to the bars are disclosed including electrofriction welding, current pulse welding and brazing, transient liquid phase joining and casting. Pressure is also applied to the end rings to improve contact and reduce areas of small or uneven contact between the bar ends and the end rings. Rotors made with such methods are also disclosed.
REFERENCES:
patent: 5156316 (1992-10-01), Nied et al.
patent: 5829664 (1998-11-01), Spinella et al.
patent: 6088906 (2000-07-01), Hsu et al.
patent: 6417477 (2002-07-01), Brown et al.
Arbes Carl J.
Phan Tim
UT-Battelle LLC
Wilson Kirk A.
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