Inductance Wizard

Inductance wizard helps you calculate self and mutual inductance of your coils in the problem of DC or AC magnetics.

When your model contains several coils that carry different currents, the flux linkage with one of them can be calculated as

φ_k = L_kk·i_k + M_nk·i_n,

where

L_kk is the self inductance of the coil k,
M_nk is the mutual inductance between the coils n and k,
i_k is the current in the coil k.

On the other hand, stored magnetic energy also derives from currents and inductances:

W = ½·(L_kk·i_k² + M_nk·i_n·i_k).

Before using the inductance wizard, you have to formulate your problem in such a way that all the currents (space, surface or linearly distributed) but one are set to zero. There must be no permanent magnets in your model. In that case equation above becomes extremely simple and you can get inductance value as:

L = φ / i,

where φ is the flux linkage with the coil excited by current i, or

L = 2 · W / i²,

where W is stored magnetic energy and i is the only current.

The first approach gives the self-inductance, if you get the flux linkage and the current in the same coil and mutual inductance if the coils are different. The second approach gives only the self-inductance.

Initial page of the inductance wizards invites you to choose between two approaches described above. After choosing one of them click the Next button.