Legg's equation

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Legg's equation models magnetic material core loss at low flux densities. The equation has three loss components: hysteresis, residual, and eddy current.[1][2][3]

Equation

where

Rac is the effective core loss resistance (ohms)
μ is the material permeability
L is the inductance (henrys)
a hysteresis loss coefficient
Bmax is the maximum flux density (gauss)
c is the residual loss coefficient
f is the frequency (hertz)
e is the eddy loss coefficient

IEC Technical Committee is the modern definition.[4]

References

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