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Calculate flux partial derivatives for FEM-Parameterized PMSM block

```
[dFdA,dFdB,dFdC,dFdX]
= elec_calculateFluxPartialDerivatives(A,B,C,X,F)
```

```
[dFdA,dFdB,dFdC,dFdX,D,Q]
= elec_calculateFluxPartialDerivatives(A,B,C,X,F)
```

`[`

calculates
the partial derivatives from flux linkage. For improved numerical
performance, the FEM-Parameterized PMSM block works
with flux linkage partial derivatives, rather than directly with flux
linkage. If your finite-element motor design tool does not have an
option to output partial derivatives, then you can use this function
to calculate the partial derivatives from the flux linkage. The flux
linkage `dFdA`

,`dFdB`

,`dFdC`

,`dFdX`

]
= elec_calculateFluxPartialDerivatives(`A`

,`B`

,`C`

,`X`

,`F`

)`F`

must be a four-dimensional matrix with
the first three dimensions corresponding to the `A`

, `B`

,
and `C`

phase currents, and the fourth dimension
corresponding to the rotor angle `X`

. The function
returns four-dimensional matrices for the four partial derivatives.
Use this syntax in conjunction with the 4-D Data variant of the block.

`[`

returns
two additional output arguments corresponding to `dFdA`

,`dFdB`

,`dFdC`

,`dFdX`

,`D`

,`Q`

]
= elec_calculateFluxPartialDerivatives(`A`

,`B`

,`C`

,`X`

,`F`

)* d*-axis
and

`q`

`d`

`q`

The function calculates partial derivatives using Akima splines,
the same method that is used for `smooth`

interpolation
in the Simscape™ language `tablelookup`

function.
For more information, see Smooth Interpolation Algorithm (Simscape). Akima splines are
suitable for estimating partial derivatives due to their smooth nature
and tendency not to introduce local gradient reversals.