Article | REF: D3040 V1

Iron-core inductor in the time-dependent case

Author: François LEPLUS

Publication date: February 10, 2007

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2. Real coil

The real coil is the seat of non-linear phenomena that complicate calculations enormously. In particular, in the magnetic circuit :

  • material saturation: b and h are no longer proportional;

  • magnetic hysteresis, which results in a doubling of the b (h) characteristic;

  • the appearance of induced currents known as eddy currents.

The last two phenomena give rise to losses in the magnetic circuit, known as hysteresis losses and eddy-current or iron losses.

First, we'll assume that hysteresis and eddy currents are negligible 2.1

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