Common-mode filtering device and speed variator comprising such a device
US7868730B2 · kind B2 · utility
3Cited by
6References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 4, 2007 |
| Grant date | Jan 11, 2011 |
| Priority date | — |
| Expiry date | May 22, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H1/0007
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a filtering device which includes a common-mode inductor (LF) comprising a winding (L1, L2) on each line of an AC power supply and a magnetic core made up of a first torus (T1) and a second torus (T2). The first torus (T1) has a first magnetic permeability (μ1) and the second torus (T2) has a second magnetic permeability (μ2, μ′2), the first permeability being equal to or greater than three times the second permeability, in order to prevent the common-mode inductor from saturating in the resonant frequency range of the filtering device. Application to the EMC filter of a speed variator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.