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Abstract

A method for Roebel transposition of form wound conductors for electrical machines is disclosed which creates less distortion of strand geometry and more efficiently stacks the conductor strands. The transposition involves four stacks of conductors, where two conductor strands from a top position in the first two adjacent stacks of conductors are transposed side-by-side two places to a top position in the other two adjacent stacks of conductors, with a corresponding downward shift in the second two stacks and upward shift in the first two stacks. Compared to a traditional Roebel pattern involving only two stacks of conductors and transposing two vertically-adjacent strands, the four-stack side-by-side Roebel transposition method produces a stack height which is reduced by one strand, and reduces the likelihood of strand-to-strand short circuits because of the smoother transition geometry involved.

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First Claim