Char. - Model - SSFR

Positioning and objective

The aim of the test “Characterization – Model – Motor – SSFR” dedicated to the wound field synchronous machine is to characterize all the parameters of the D-axis and Q-axis equivalent schemes by performing a frequency analysis.



Characterization – Model – Motor – SSFR” – Characterization of all the equivalent scheme parameters

D-axis and Q-axis equivalent scheme data – 2nd order is considered in the example above.

These results are based on the magnitude and the phase of the operational inductance transfer function which are computed with Finite Element software Altair® Flux® 2D.

The resulting reactances and time constants of the machines are also provided. Hence, such data can be used in system modeling tools like Altair® PSIMTM to evaluate the behavior of the machine with its drive and control system.
Reactances and time constants of the machine are computed
Family Characterization
Package Model
Convention Motor
Test SSFR
Positioning of the test "Characterization - Model - Motor - SSFR"

User inputs

The main user input parameters are the order of the operational inductance transfer function to be considered for the D-axis and the Q-axis of the machine. 1st and 2nd order are considered depending not only on the presence or absence of dampers in the rotor pole shoes, but also on the accuracy of the results obtained with the 1st order model. For the Q-axis, it is also possible to consider a zero order model since machines without dampers normally present a quasi-constant response for the Q-axis.

Then, the reference frequency and the reference impedance for the per-unit system computation are needed to compute the resulting machine reactances.

In addition, the temperatures of the stator and rotor windings and dampers must be set.

Main outputs and results

The main outputs are all the computed parameters of the equivalent scheme (Zero, 1st or 2nd).

The quality of results is also illustrated with the superimposition of the magnitude and phase of the operational inductance is computed either with Finite Element software Flux® 2D (Steady State AC application) or analytically by considering the resulting operational inductance.

Table or results
  1. D-axis and Q-axis equivalent scheme parameters
    • Operational inductance Laplace function with the corresponding computed parameters
    • Wound field synchronous machine equivalent scheme, D-axis and Q-axis (Zero, 1st or 2nd) with its associated computed parameters
    • Reactances and time constants
Curves
  1. Magnitude of the operational inductance versus frequency – D-axis and Q-axis
  2. Phase of the operational inductance versus frequency – D-axis and Q-axis