Magnetics

Computational Magnetics

Many electro-technical devices such as e.g. printed circuit boards, electrical drives and antenna systems can be simulated on the basis of electrical circuits. However, the increasing frequencies and the decreasing size force designers to account for wave propagation effects, eddy-current effects, ferromagnetic saturation and hysteresis. For wave propagation effects and eddy-current effects, the results of stand-alone field simulation can be represented by an order-reduced equivalent model, which is then inserted in the overall circuit model. The representation of field-dependent nonlinearities and hysteresis effects, however, is not straightforward.

The coupled field and circuit simulation becomes troublesome when a large number of time steps is required. This occurs when e.g. simulating an electrical drive where the machine requires 10 periods of 50 Hz to reach nominal speed whereas the switching of the Insulated Gate Bipolar Transistors in the frequency converter switches at 20 kHz, necessitating a time steps in the order of a microsecond to be used in the simulation. Since the field model consists typically of a few million degrees of freedom, all those unknowns have to be solved in every time step. Fortunately, the relevant time constants in electrical-energy converter are in the range 50 Hz. Hence the field model does not have to be time-stepped at the same rate as the circuit model, in which fast switches are present. The use of adaptive multirate time-integration schemes can reduce the numerical complexity of the problem substantially.

Research Questions

Efficiency of the time-integration for field devices in pulsed circuits (multirate, dynamic iteration)
DAE-index of the coupled system
Existence and Uniqueness of the solution

Cooperation

Herbert De Gersem, Katholieke Universiteit Leuven
Markus Clemens, Bergische Universität Wuppertal
Sascha Baumanns, Universität zu Köln

Former and ongoing projects

Publications

1987: 193.
Bunker, Philip R.; Jensen, Per; Kraemer, Wolfgang P.; Beardsworth, R.
Calculated rotation-vibration energies for HOC\(^{+}\)
Journal of Molecular Spectroscopy, 121 (2) :450-452
1987
DOI: 10.1016/0022-2852(87)90061-0; 192.
Bunker, Philip R.; Jensen, Per; Kraemer, Wolfgang P.; Beardsworth, R.
Calculated rotation-vibration energies for HOC+
Journal of Molecular Spectroscopy, 121 (2) :450-452
1987
DOI: 10.1016/0022-2852(87)90061-0; 191.
Fink, Ewald H.; Kruse, H.; Ramsay, D. A.; Wang, Ding Chang
High resolution studies of the b\(^{1}\)\(\Sigma\)\(^{+}\) - X\(^{3}\)\(\Sigma\) emission system of SeS
Molecular Physics, 60 (2) :277-290
1987
DOI: 10.1080/00268978700100221; 190.
Fink, Ewald H.; Kruse, H.; Ramsay, D. A.; Wang, Ding Chang
High resolution studies of the b\(^{1}\)\(\Sigma\)\(^{+}\) - X\(^{3}\)\(\Sigma\) emission system of SeS
Molecular Physics, 60 (2) :277-290
1987
DOI: 10.1080/00268978700100221; 189.
Fink, Ewald H.; Kruse, H.; Ramsay, D. A.; Wang, Ding Chang
High resolution studies of the b1Σ+ - X3Σ emission system of SeS
Molecular Physics, 60 (2) :277-290
1987
DOI: 10.1080/00268978700100221; 188.
Fink, Ewald H.; Setzer, Klaus-Dieter; Ramsay, D. A.; Vervloet, M.
High-resolution study of the emission system of \(^{80}\)SeO
Journal of Molecular Spectroscopy, 125 (1) :66-75
1987
DOI: 10.1016/0022-2852(87)90193-7; 187.
Fink, Ewald H.; Setzer, Klaus-Dieter; Ramsay, D. A.; Vervloet, M.
High-resolution study of the emission system of \(^{80}\)SeO
Journal of Molecular Spectroscopy, 125 (1) :66-75
1987
DOI: 10.1016/0022-2852(87)90193-7; 186.
Fink, Ewald H.; Setzer, Klaus-Dieter; Ramsay, D. A.; Vervloet, M.
High-resolution study of the emission system of 80SeO
Journal of Molecular Spectroscopy, 125 (1) :66-75
1987
DOI: 10.1016/0022-2852(87)90193-7; 185.
Franik, R.; Tausch, Michael W.; Autorenteam
KLAUSUR- UND ABITURTRAINING CHEMIE, Aufgabensammlung mit Lösungen und weiterführenden Informationen für die S II, 7 Bände
Herausgeber: Aulis Deubner\&Co KG, Köln
1987; 184.
[german] Tausch, Michael W.
Photochemische cis-trans Isomerisierungen
Der mathematische und naturwissenschaftliche Unterricht (MNU), 40 :92
1987; 183.
Tausch, Michael W.; Fischer, W.; Glöckner, W.; Köhler-Degner, M.; Nöding, S.; Wolf, H.
STOFF UND FORMEL - Chemiebuch für Gymnasien, S I, 291 Seiten
Herausgeber: C. C. Buchner, Bamberg
1987; 182.
Tausch, Michael W.; Fischer, W.; Glöckner, W.; Köhler-Degner, M.; Nöding, S.; Wolf, H.
STOFF UND FORMEL - Chemiebuch für Gymnasien; Ausgabe NRW, S I, 291 Seiten
Herausgeber: C. C. Buchner, Bamberg
1987; 181.
Tausch, Michael W.; Fischer, W.; Glöckner, W.; Köhler-Degner, M.; Nöding, S.; Wolf, H.
STOFF UND FORMEL - Lehrerbände mit didaktischen Hinweisen und Lösungen der Aufgaben zu STOFF UND FORMEL - Chemiebuch für Gymnasien und Ausgabe NRW
Herausgeber: C. C. Buchner, Bamberg
1987
1986: 180.
Maten, E. Jan W.; Sleijpen, Gerard L. G.
A convergence analysis of Hopscotch methods for fourth order parabolic equations
Numerische Mathematik, 49 (2-3) :275--290
März 1986
Herausgeber: Springer Science and Business Media {LLC}
DOI: 10.1007/bf01389630; 179.
Jensen, Per; Spirko, Vladim{í}r
A new Morse-oscillator based Hamiltonian for H\(_{3}\)\(^{+}\): Calculation of line strengths
Journal of Molecular Spectroscopy, 118 (1) :208-231
1986
DOI: 10.1016/0022-2852(86)90236-5; 178.
Jensen, Per; Spirko, Vladim{í}r
A new Morse-oscillator based Hamiltonian for H\(_{3}\)\(^{+}\): Calculation of line strengths
Journal of Molecular Spectroscopy, 118 (1) :208-231
1986
DOI: 10.1016/0022-2852(86)90236-5; 177.
Jensen, Per; Spirko, Vladim{í}r; Bunker, Philip R.
A new Morse-oscillator based Hamiltonian for H\(_{3}\)\(^{+}\): Extension to H\(_{2}\)D\(^{+}\) and D\(_{2}\)H\(^{+}\)
Journal of Molecular Spectroscopy, 115 (2) :269-293
1986
DOI: 10.1016/0022-2852(86)90047-0; 176.
Jensen, Per; Spirko, Vladim{í}r; Bunker, Philip R.
A new Morse-oscillator based Hamiltonian for H\(_{3}\)\(^{+}\): Extension to H\(_{2}\)D\(^{+}\) and D\(_{2}\)H\(^{+}\)
Journal of Molecular Spectroscopy, 115 (2) :269-293
1986
DOI: 10.1016/0022-2852(86)90047-0; 175.
Jensen, Per; Spirko, Vladimír
A new Morse-oscillator based Hamiltonian for H3+: Calculation of line strengths
Journal of Molecular Spectroscopy, 118 (1) :208-231
1986
DOI: 10.1016/0022-2852(86)90236-5; 174.
Jensen, Per; Spirko, Vladimír; Bunker, Philip R.
A new Morse-oscillator based Hamiltonian for H3+: Extension to H2D+ and D2H+
Journal of Molecular Spectroscopy, 115 (2) :269-293
1986
DOI: 10.1016/0022-2852(86)90047-0; 173.
Adams, Warren P; Sherali, Hanif D
A tight linearization and an algorithm for zero-one quadratic programming problems
Management Science, 32 (10) :1274--1290
1986
Herausgeber: INFORMS; 172.
Beardsworth, R.; Bunker, Philip R.; Jensen, Per; Kraemer, Wolfgang P.
Ab initio rotation-vibration energies of HOC\(^{+}\) calculated using the nonrigid bender Hamiltonian
Journal of Molecular Spectroscopy, 118 (1) :40-49
1986
DOI: 10.1016/0022-2852(86)90221-3; 171.
Beardsworth, R.; Bunker, Philip R.; Jensen, Per; Kraemer, Wolfgang P.
Ab initio rotation-vibration energies of HOC\(^{+}\) calculated using the nonrigid bender Hamiltonian
Journal of Molecular Spectroscopy, 118 (1) :40-49
1986
DOI: 10.1016/0022-2852(86)90221-3; 170.
Beardsworth, R.; Bunker, Philip R.; Jensen, Per; Kraemer, Wolfgang P.
Ab initio rotation-vibration energies of HOC+ calculated using the nonrigid bender Hamiltonian
Journal of Molecular Spectroscopy, 118 (1) :40-49
1986
DOI: 10.1016/0022-2852(86)90221-3; 169.
Kraemer, Wolfgang P.; Roos, B. O.; Bunker, Philip R.; Jensen, Per
An ab initio calculation of the rotation-vibration energies of the state of CCH using the nonrigid bender Hamiltonian
Journal of Molecular Spectroscopy, 120 (1) :236-238
1986
DOI: 10.1016/0022-2852(86)90085-8

Computational Magnetics

Research Questions

Cooperation

Former and ongoing projects

Publications

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