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Nonlinear ferromagnetic core in sinusoidal magnetic field

A sinusoidal current carrying conductor is surrounded by nonlinear ferromagnetic core.

Problem Type:

Plane problem of AC magnetics.


AC current conductor inside steel tube

Total current I = 500 A.
Frequency f = 50 Hz.
Core BH-curve: H = 100·B2

Calculate B and H distribution along the radius r.

To calculate the sinusoidal filed distribution in nonlinear core we should use the modified curve B'(H) (see more in QuickField documentation).
In this particular case the modified BH-curve can be calculated as B`(H) = B(H) * (1 + 1/sqrt(180))

B,H distribution along the radius

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