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Licensed Unlicensed Requires Authentication Published by Oldenbourg Wissenschaftsverlag February 9, 2018

Design of a rotational iron loss measurement system

Entwicklung eines Messsystems zur Bestimmung von Eisenverlusten bei Drehmagnetisierung
Martin Kitzberger, Gerd Bramerdorfer, Dietmar Andessner, Gereon Goldbeck and Wolfgang Amrhein
From the journal tm - Technisches Messen

Abstract

This article is about the design of a measurement system for measuring iron losses in soft magnetic composites under controlled circular flux density patterns. With conventional measurement setups for iron loss determination, material samples are usually magnetized along a single spatial direction. However, in some parts of electrical machines magnetization loci over time substantially divert from the patterns used during conventional alternating loss measurements. Based on previous findings, iron losses strongly depend on the actual two dimensional magnetization locus over time. Therefore, the measurement with alternating magnetization cannot fully reflect the magnetizing conditions and iron losses present during machine operation. Available data especially for soft magnetic composites (SMC) regarding rotational losses is very limited. Hence, in this article a new measurement setup for the investigation of iron losses under controlled circular flux density loci was designed. It turns out, that iron losses show a significant deviation when comparing alternating and rotational losses with regard to the flux density magnitude and frequency.

Zusammenfassung

Dieser Artikel beschreibt das Design einer Messvorrichtung zur Bestimmung der Eisenverluste in Soft Magnetic Composite (SMC) Materialien bei eingeprägter kreisförmiger Drehmagnetisierung. Häufig werden die im Material auftretenden Eisenverluste mit Messmethoden bestimmt, bei denen die Magnetisierung nur entlang einer einzigen Raumrichtung des zu untersuchenden Materials variiert wird. Aktuelle Verlustmodelle basieren ebenfalls meist auf Messdaten welche bei einachsiger alternierender Magnetisierung erfasst wurden. Bei elektrischen Maschinen treten jedoch in manchen Bereichen von Rotor und Stator komplexere zweiachsige zeitlich veränderliche Magnetisierungsverläufe auf. Neuere Untersuchungen zeigen, dass die Eisenverluste eine starke Abhängigkeit vom zweidimensionalen zeitlichen Flussdichteverlauf im Material aufweisen. Die einachsige Verlustmessung deckt somit die Magnetisierungsverläufe und Eisenverluste welche in der realen Maschine auftreten nicht zufriedenstellend ab. Es kommt dadurch zu Abweichungen in den tatsächlich auftretenden Eisenverlusten, von den zuvor durchgeführten Messungen und den daraus abgeleiteten Verlustmodellen. Speziell für SMC Materialien sind derzeit nur wenig Daten über den Anteil dieser sogenannten Drehverluste verfügbar. Der in diesem Artikel vorgestellte Messaufbau ermöglicht die messtechnische Bestimmung von Drehverlusten in Soft Magnetic Composite Material. Es zeigt sich, dass alternierende Verluste und Drehverluste je nach beobachteter Flussdichteamplitude und Frequenz einen unterschiedlichen Betrag aufweisen.

Funding statement: The projects are kindly supported by the Austrian and Upper Austrian government.

Acknowledgment

This work was conducted within LCM GmbH as a part of the COMET K2 program of the Austrian government. The authors thank all supporters with special thanks to voestalpine, who provide funding for this particular research.

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Received: 2017-7-31
Revised: 2017-10-5
Accepted: 2018-1-19
Published Online: 2018-2-9
Published in Print: 2018-4-25

© 2018 Walter de Gruyter GmbH, Berlin/Boston