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Open AccessArticle

Iron Loss Prediction Using Modified IEM-Formula during the Field Weakening for Permanent Magnet Synchronous Machines

1
The Department of Electrical Engineering, Polytechnic University of Catalonia-BarcelonaTech (UPC), 08034 Barcelona, Spain
2
The Department of Electrical and Computer Engineering, University Of Canterbury, Christchurch 8041, New Zealand
*
Author to whom correspondence should be addressed.
Machines 2017, 5(4), 30; https://doi.org/10.3390/machines5040030
Received: 20 September 2017 / Revised: 27 November 2017 / Accepted: 29 November 2017 / Published: 5 December 2017
(This article belongs to the Special Issue High Speed Motors and Drives: Design, Challenges and Applications)
During field weakening operation time (FWOT), the total iron loss rises and affects the accuracy of loss prediction and efficiency, especially if a large range of FWOT exists due to a large voltage drop that was rooted from the resistance of the used material. Iron loss prediction is widely employed in investigations for a fast electrical machine analysis using 2D finite element analysis (FEA). This paper proposes harmonic loss analytically by a steady-state equivalent circuit with a novel procedure. Consideration of skin effects and iron saturation are utilized in order to examine the accuracy through the relative error distribution in the frequency domain of each model from 50 to 700 Hz. Additionally, this comparative study presents a torque-frequency-field density calculation over each single term of the modified institute of electrical machines formula (IEM-Formula). The proposed analytical calculation is performed using 2D FEA for a classic and modified IEM-Formula along with experimental verifications on a surface-mounted permanent magnet synchronous generator (PMSG) for a wind generation application. View Full-Text
Keywords: electrical machine; field weakening; IEM-Formula; wind energy; iron loss; synchronous generator; equivalent circuit; harmonic loss electrical machine; field weakening; IEM-Formula; wind energy; iron loss; synchronous generator; equivalent circuit; harmonic loss
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MDPI and ACS Style

Asef, P.; Bargallo, R.; Lapthorn, A. Iron Loss Prediction Using Modified IEM-Formula during the Field Weakening for Permanent Magnet Synchronous Machines. Machines 2017, 5, 30.

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