Finite length effects in linear induction machines with different iron contours

Mosebach, H.; Huhns, T.; Pierson, E.S.; Herrmann, Dirk

doi:10.1109/t-pas.1977.32425

Cited by 18 publications

(5 citation statements)

References 8 publications

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“…As it was also shown in [3] this does not have any influence on the accuracy of the calculated results of the electromagnetic field distribution along the active zone of the air-gap.…”

Section: Discussionsupporting

confidence: 56%

Two-dimensional analysis of linear induction motor using Fourier's series method

Mendrela

Gierczak

1982

Archiv f. Elektrotechnik

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Contents : A single sided linear induction motor with finite length of the primary is considered. Calculations of magnetic flux density, secondary current, forces and power losses in two layers of a secondary are based on Fourier's series method. Variation of magnetic flux density across an air-gap and finite values of permeability and conductivity of the secondary back iron were taken into account in the computational model. Calculations were compared with test results.Zweidimensionale Analyse des linearen lnduktionsmotors nach der Methode harmonischer Fourierreihen 1Jbersieht: Es wird ein eillseitiger lillearer Induktionsmotor bei Berficksichtigung endlicher Strombelagl~nge betrachtet. Magnetische Induktion, Strom-, Kraft-und Verlustdichte in zwei Schichtell des Sekund/~rteiles wurdeI1 auf Grund der Methode harmonischer Fourierreihen berechllct, hn rechnerischen Modei1 wurde die ~nderung der magnetischen Illduktion im Spalt und der endliche Wert der magnetischen Permeabilit~t im Spalt und der endliche Wert der magnetischen Permeabilitiit sowie der Leitfiihigkeit yon Eisen im Sekundgrtell beri~cksichtigt. Die Berechnungell wurden mit Ergebnissell experimenteller Untersuchungen verglichell.

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“…As it was also shown in [3] this does not have any influence on the accuracy of the calculated results of the electromagnetic field distribution along the active zone of the air-gap.…”

Section: Discussionsupporting

confidence: 56%

Two-dimensional analysis of linear induction motor using Fourier's series method

Mendrela

Gierczak

1982

Archiv f. Elektrotechnik

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“…Numerical methods allow taking into account not only the nonlinearity of the motor iron core but also its geometrical structure (slot dimensions and finite stator and rotor length). Some analytical methods, like that one based on Fourier series technique, allow the consideration of, in an equivalent way [51], the motor geometry. However, the local nonlinearities are hard to include.…”

Section: Prefacementioning

confidence: 99%

“…The primary core is infinitely long and wide in the computational model, while the infinitely thin current sheet has the dimensions adequate to the surface of the real armature. There are papers [50,51] applying the Fourier's series method, which takes into account the finite dimensions of the primary core. The results contained in [51] indicate that this has little effect on motor performance.…”

Section: -D Field Model Of Im-2dmfmentioning

confidence: 99%

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Modeling of Induction Motors with One and Two Degrees of Mechanical Freedom

Mendrela¹,

Fleszar²,

Gierczak³

2003

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AlI rights reserved. No part ofthis work may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, microfilming, recording, or otherwise, without the written permission from the Publisher, with the exception of any material supplied specifically for the purpose ofbeing entered and executed on a computer system, for exclusive use by the purchaser of the work.Printed on acid-free paper.

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“…One description in particular (Duncan, 1983), based on an average model of the non-saturated LIM, and later expanded to include saturation (Woronowicz and Safaee, 2014), has been adopted by authors developing LIM control algorithms (Woronowicz and Palka, 2002; Woronowicz and Palka, 2003). The established analytical models of the LIM typically express the excitation currents in the primary coils as infinitely thin current sheet (Nasar and Boldea, 1976; Yamamura, 1979; Freeman and Lowther, 1973; Mosebach et al , 1977; Pierson et al , 1977; Freeman and Papageorgiou, 1978; Gieras et al , 1985; Gieras et al , 1986; Mendrela and Gierczak, 1982). However, in recent decades, LIM modeling and analysis started relying more on finite element analysis (FEA) simulations, such as in studies by Lee et al (2009); Shiri and Shoulaie (2012); Singh et al (2013); Amiri and Mendrela (2014); Abdollahi et al (2015); Jeong et al (2015), instead of analytical solutions.…”

Section: Introductionmentioning

confidence: 99%

2-D quasi-static Fourier series solution for a linear induction motor

Woronowicz

Abdelqader

Pałka

et al. 2018

COMPEL

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Purpose This paper aims to present a method for calculating electromagnetic fields, eddy currents and forces for a quasi-static two-dimensional (2-D) model of linear induction motors (LIMs) where the primary side is modeled as a collection of individual coils. Design/methodology/approach An analytical solution using Fourier series is derived for a general source with current excitations residing in an airgap and moving relative to a conducting plate and back iron. Ideal magnetic material with infinite permeability is used to model the primary iron above the primary source and the back iron below the conducting plate. Findings The analytical solution is compared to a commercial 2-D finite element analysis (FEA) simulation for validation and then compared to a 2-D FEA model with a more detailed geometry of the LIM. The analytical model accurately predicts LIM thrust even though the geometry of the primary core is simplified as an infinitely long flat slab. 2-D frequency FEA can be used successfully to predict in motion LIM performance. Originality/value The analytical solution presented here models the primary excitations as individual discrete coils instead of current sheets, which all existing models are based on. The discrete coils approach provides a more intuitive and realistic model of the LIM.

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Finite length effects in linear induction machines with different iron contours

Cited by 18 publications

References 8 publications

Two-dimensional analysis of linear induction motor using Fourier's series method

Two-dimensional analysis of linear induction motor using Fourier's series method

Modeling of Induction Motors with One and Two Degrees of Mechanical Freedom

2-D quasi-static Fourier series solution for a linear induction motor

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