Magnet问题1：无法计算非线性材料+多于一个线圈的电感

perch88

http://e.simwe.com/34599/viewspace-11356
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Please note that as stated in the Documentation Center under

Coils
    Output characteristics
        Inductance: Coupling effects,

if it is desired to obtain separately the self-inductances (i.e. excluding any mutual effect) and the mutual inductances of a set of coils, then the materials must all be linear. This is because the inductances in this case will depend on the specific combination of the excitations' amplitudes, making it impossible to distinguish between self and mutual inductances.

Note that this is not a MagNet limitation but rather a physical one

wangfei8261

了解了。感谢perch88.

perch88

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Please note that in a nonlinear context, the incremental inductance matrix could be approximately calculated, as discussed in the Documentation Center under

Coils

Output characteristics

Inductance: Inductance matrix calculation - Incremental inductance

Note that the Inductance Matrix form, mentioned in the next section, calculates the absolute inductance matrix. It would have to be modified in order to provide the incremental inductance matrix.

详情请看附图，图又是贴不上，打字：

Incremental inductance

The incremental inductance matrix [Lij = dfluxi/dIj] can be obtained at a specific operation point (I1,...In,B0) as follows:

1. solve model at operation point (I1,....In,B0) to obtain fluxes(flux1,...fluxn) in each coil

2. For j=1 to n

  solve model at perturbed operation point(I1,...Ij+deltaI1...In,B0) to obtain pertubed fluxed(flux1,...fluxn)

  For i=1 to n

      calculate Iij=(fluxpi-fluxi)/deltaI

  Next i

Next j

The current perbation deltaI could be such that the fluxes are perturbed slightly, yet sufficiently to ensure good accuracy. Usually, a 5% flux change is adequate.

详细请看：
http://e.simwe.com/34599/spacelist-blog-itemtypeid-1060