# .SpotExamples.p_Precalculation

## Information

These examples illustrate the connection between different ways of specifying a machine.
In particular they show the calculation of

• impedance matrix from transient data
• impedance matrix from equivalent circuit
• transient data from equivalent circuit
• equivalent circuit from transient data
for transient order n = 1 to 3.

The parameter values are chosen in such a way, that the circuit-data
(see 'Diagram layer' of the examples)

`  r_r[1:n], r_s} and {xsig_r[1:n], xsig_s}`
remain the same for d- and q-axis. This facilitates checking.

For machines with field-winding (synchronous), d- and q-axis differ, if n > 1

```  xm[2:n] > 0, coupling terms exist in d-axis
xm[2:n] = 0, no coupling terms in q-axis
```
whereas for machines without field-winding (asynchronous), the q-axis diagram is valid for both axes d and q.

up users guide

## Contents

NameDescription
Z_matrixTrDat0z-matrix from transient data, n=1, 0
Z_matrixTrDat1z-matrix from transient data, n=1
Z_matrixTrDat2z-matrix from transient data, n=2
Z_matrixTrDat3z-matrix from transient data, n=3
Z_matrixEqCirc0z-matrix from equivalent circuit, n=1, 0
Z_matrixEqCirc1z-matrix from equivalent circuit, n=1
Z_matrixEqCirc2z-matrix from equivalent circuit, n=2
Z_matrixEqCirc3z-matrix from equivalent circuit, n=3
TransDatFromEqCircCalculates transient data from equivalent circuit
EqCircFromTransDatCalculates equivalent circuit from transient data

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