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Communication Dans Un Congrès Année : 2021

A frequency-dependant lumped parameter model of electrical machine windings

Résumé

New generation electronic converters, that impose very fast voltage fronts, might lead to electrical stress that exceeds the partial discharge inception voltage once applied to an electrical machine. Consequently, a premature breakdown of the elec- trical insulation system of the machine may occur once Partial Discharges (PD) start taking place, which decreases the reliability of the machine and can lead to its untimely failure. Hence, a model taking into account the different phenomena occurring within the winding of the machine is required for a good prediction of the whereabouts of these damaging PD. In this work, a phenomenological lumped parameter model of the winding of the machine is developed. To account for Joule losses as well as the appearing elec- tromotive force, each turn is modeled by a resistance in series with an inductance, respectively. The latter is connected in parallel with a resistance modeling iron losses. The turn-to-turn and turn-to-ground capactive coupling is modeled using a capacitance in parallel with a resistance. A magnetodynamic finite element model, which takes into account skin and proximity effects along with flux penetration, is used to compute the values of these lumped parameters. In contrast with previous works (M. Toudji et al., “Determination of Winding Lumped Parameter Equivalent Circuit by Means of Finite Element Method”, IEEE Trans. Magn. 53(6), 2017), the frequency-dependent behavior of the capacitive coupling is also taken into account, which is a key point to increasing the prediction accuracy of the voltage distribution. The frequency-dependent dielectric properties of the insulating materials are obtained through measurements and fitted to a Debye model. Results showcase the impact on the global impedance of the machine (in particular at resonance) as well as on the voltage distribution in the windings.

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Dates et versions

hal-04114190 , version 1 (15-01-2024)

Identifiants

  • HAL Id : hal-04114190 , version 1

Citer

Kaoutar Hazim, Guillaume Parent, Stéphane Duchesne, Christophe Geuzaine. A frequency-dependant lumped parameter model of electrical machine windings. 12th International Symposium on Electric and Magnetic Fields (EMF 2021), Jul 2021, Marseille, France. ⟨hal-04114190⟩

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