Common-mode filtering device and speed variator comprising...

Details Common-mode filtering device and speed variator comprising... Common-mode filtering device and speed variator comprising...

2011-01-11

2011-01-11

Berhane, Adolf (Department: 2838)

Inductor devices

Coils of special configuration

Toroidal

C363S047000

Reexamination Certificate

active

07868730

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.

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