Affiliations: Research Laboratory SIME, ENSIT, University of Tunis, Tunis, Tunisia
Correspondence:
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Corresponding author: Habib Rehaoulia, Research Laboratory SIME, ENSIT, University of Tunis, 5 avenue Taha Hussein BP 56 - 1008 Tunis, Tunisia. E-mail:habib.rahaoulia@esstt.rnu.tn
Abstract: This article discusses the modeling of double star
induction machines (DSIM). Its main objective is to study the impact of the
stator mutual leakage inductance on the modeling of such machines, in
steady-state and dynamic operations. For that purpose, experimental and
simulation results are conducted on two squirrel cage induction machines
with equal ratings. The stator of each machine is specifically conceived
with two sets of three phase windings. Spatial shifting θ , between
the two stars, is made 0° for the first machine and 30° for the
second. Regarding the machine modeling, the study encompasses three cases. First,
the mutual leakage inductance is included. Second, the mutual leakage
inductance is considered as a self-leakage inductance. Third, the mutual
leakage inductance is simply neglected. However, by defining a couple of
parameters (α _k, β _k)an original compact model is developed.
The approach applies either in steady state or in transient operation. In addition, to enhance the accuracy of the modelling process, the effect of
magnetic saturation is introduced in the d-q mathematical model of the
double star induction machine (DSIM), whatever the electrical shifting
between the two stator stars. Predictions of various electrical and mechanical characteristics have shown
the importance of taking into account the mutual leakage fluxes in the DSIM
modeling, especially in transient operation. Analysis of simulation and
practical results has also confirmed the correct model.
Keywords: Double star induction machine (DSIM), modeling, mutual leakage inductance
