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Effects of inverter supply on the iron loss characteristics of doubly fed induction machines

Paul Handgruber (Institute for Fundamentals and Theory in Electrical Engineering, Graz University of Technology, Graz, Austria and Christian Doppler Laboratory for Multiphysical Simulation, Analysis and Design of Electrical Machines, Graz University of Technology, Graz, Austria)
Simon Schernthanner (Institute for Fundamentals and Theory in Electrical Engineering, Graz University of Technology, Graz, Austria and Christian Doppler Laboratory for Multiphysical Simulation, Analysis and Design of Electrical Machines, Graz University of Technology, Graz, Austria)
Oszkár Bíró (Institute for Fundamentals and Theory in Electrical Engineering, Graz University of Technology, Graz, Austria and Christian Doppler Laboratory for Multiphysical Simulation, Analysis and Design of Electrical Machines, Graz University of Technology, Graz, Austria)
Andrej Stermecki (ELIN Motoren GmbH, Preding/Weiz, Austria)
Georg Ofner (ELIN Motoren GmbH, Preding/Weiz, Austria)

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering

ISSN: 0332-1649

Article publication date: 7 September 2015

122

Abstract

Purpose

The purpose of this paper is to study the effects of inverter supply on the iron loss characteristics of slip-ring induction machines. Pulse width modulated (PWM) voltage supply on the stator side, as well as a doubly fed operation mode with rotor-sided inverter, are investigated.

Design/methodology/approach

An inverter fed machine model is coupled to previously developed eddy current and hysteresis loss models. The eddy current model is based on a finite element method and considers the three-dimensional (3D) eddy current distribution in the steel sheets. The hysteresis losses are computed by a static Preisach vector model.

Findings

It is found that under stator-sided inverter supply the eddy current losses do significantly increase when compared to sinusoidal feeding, contributing to a total loss increase of 10-15 percent. In doubly fed operation, the additional losses are generally lower owing to the winding topology of the studied machine.

Research limitations/implications

The analyses presented are restricted to single PWM pattern only. The influences of different PWM parameters remain to be investigated in future.

Practical implications

Regarding practical applications, the reduced additional losses in doubly fed configurations can be considered as a further advantage when competing against other topologies available.

Originality/value

The 3D eddy current model is applied for the first time to quantify the effects of inverter supply. Furthermore, the presented studies on the iron losses in doubly fed operation are original and of practical value for designers and researches.

Keywords

Acknowledgements

This work has been supported by the Christian Doppler Research Association (CDG) and by the ELIN Motoren GmbH.

Citation

Handgruber, P., Schernthanner, S., Bíró, O., Stermecki, A. and Ofner, G. (2015), "Effects of inverter supply on the iron loss characteristics of doubly fed induction machines", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 34 No. 5, pp. 1460-1474. https://doi.org/10.1108/COMPEL-02-2015-0051

Publisher

:

Emerald Group Publishing Limited

Copyright © 2015, Emerald Group Publishing Limited

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