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Transformer having fractional turn windings

  • US 6,348,848 B1
  • Filed: 05/03/2001
  • Issued: 02/19/2002
  • Est. Priority Date: 05/04/2000
  • Status: Expired due to Fees
First Claim
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1. A transformer having fractional equivalent turns on at least one winding, comprisingat least a first magnetic core, the at least a first magnetic core comprising a magnetic circuit having at least three flux paths, a source of magnetomotive force to generate magnetic flux in the at least three flux paths, the source of magnetomotive force having a phase defined by the timing and the direction of the flux which it generates in the at least three flux paths, and a flux distribution winding to determine the distribution of the flux in the at least three flux paths comprising a first flux distribution coil wound around one of the at least three flux paths, and at least a second flux distribution coil wound around at least a second of the at least three flux paths, the at least a first flux distribution coil having a number n turns where n is a positive or negative integer, the sign of the number n indicating its phase with respect to the phase of the source of magnetomotive force, the at least a second flux distribution coil having a number m turns where m is a positive or negative integer, the sign of the number m indicating its phase with respect to the phase of the source of magnetomotive force, the first flux distribution coil and at least the at least a second flux distribution coil further being connected together so that the first flux distribution coil and at least the at least a second flux distribution coil have a common terminal voltage Vt induced in the first flux distribution coil and at least the at least a second flux distribution coil by the flux through the first flux distribution coil and the flux through at least the at least a second flux distribution coil, whereby through flux through the first flux distribution coil is proportional to Vt divided by n and whereby the flux through the at least a second flux distribution coil is proportional to Vt divided by m.

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