40° phase-shifting autotransformer
US7474188B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 2005 |
| Grant date | Jan 6, 2009 |
| Priority date | — |
| Expiry date | Mar 21, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F30/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to an autotransformer for transforming a three-phase power supply into a nine-phase power supply, notably for use in a rectifier. The autotransformer is a, step-up or step-down transformer. For a step-down application, the three-phase input terminals E1, E2, E3. are connected to one of the three main windings in delta configuration, mounted on respective magnetic branches M12, M23, M31 of a magnetic circuit. Te main winding B12 of one branch has intermediate taps K1, K′1, K″1 from which auxiliary windings X31, Y23, Z31, mounted on the other branches, start. These auxiliary windings produce, on three output terminals A1, B1, C1, voltages one of which is in phase with the three-phase supply voltage at E1, the other phase-shifted by +40°, and the third by +80°. The number of turns in the auxiliary windings and the position of the intermediate taps are calculated so as to obtain this result. The identical windings of the other branches produce the other output voltages on the terminals A2, B2, C2, A3, B3 in order to produce a system with nine phases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.