Transformer having fractional turn windings
US6348848B1 · kind B1 · utility
Inventor
Key dates
| Filing date | May 3, 2001 |
| Grant date | Feb 19, 2002 |
| Priority date | — |
| Expiry date | May 3, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F30/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a transformer wound on a core having three or more legs (N legs), N−1 of the legs can have a flux distribution winding on them comprising flux distribution coils on each of the N−1 legs. The flux distribution coils are all connected together, usually in phase, so all of the coils see the same voltage. If the several coils have different numbers of turns, then the volt per turn will differ inversely, and so too will the flux in the N−1 legs. The flux in the Nth leg is the algebraic sum of the flux in the N−1 legs, and is usually the “Main” flux path. A winding around one of the legs would have a terminal voltage proportional to the number of turns and the flux in the leg. A winding may make several turns around the main leg of the transformer, then make one or more turns around a side leg having a different flux, usually some fraction of the flux in the main leg. The extra turns, having a fractional flux, are the equivalent of a fractional turn. The ampere-turns are reconciled by a circulating current in the flux distribution windings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.