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

1983: 92.
Winter, R.; Kruse, H.; Fink, Ewald H.; Wildt, Jürgen
b1Σ+ Emissions from group V-VII diatomic molecules: b0+ → X10+ emission of Pl
Chemical Physics Letters, 102 (5) :404-408
1983
DOI: 10.1016/0009-2614(83)87432-6; 91.
Tausch, Michael W.
Chemische Solarenergiespeicherung in Valenzisomeren
Praxis der Naturwissenschaften (Chemie), 32 :79
1983; 90.
Tausch, Michael W.
DER UV-TAUCHLAMPENREAKTOR FÜR PHOTOCHEMISCHE SCHULVERSUCHE, Monographie mit Versuchsanleitungen und didaktischen Hinweisen
Herausgeber: SCS Jürgens\&Co KG, Bremen
1983; 89.
Jensen, Per
HCNO as a semirigid bender: The degenerate \(\nu\)\(_{4}\) state
Journal of Molecular Spectroscopy, 101 (2) :422-439
1983
DOI: 10.1016/0022-2852(83)90146-7; 88.
Jensen, Per
HCNO as a semirigid bender: The degenerate \(\nu\)\(_{4}\) state
Journal of Molecular Spectroscopy, 101 (2) :422-439
1983
DOI: 10.1016/0022-2852(83)90146-7; 87.
Jensen, Per
HCNO as a semirigid bender: The degenerate ν4 state
Journal of Molecular Spectroscopy, 101 (2) :422-439
1983
DOI: 10.1016/0022-2852(83)90146-7; 86.
Holstein, K. J.; Fink, Ewald H.; Wildt, J{ü}rgen; Winter, R.; Zabel, Friedhelm
Mechanisms of perhydroxyl HO\(_{2}\)(A\(^{2}\)A') excitation in various chemical systems
The Journal of Physical Chemistry, 87 (20) :3943-3948
1983
DOI: 10.1021/j100243a029; 85.
Holstein, K. J.; Fink, Ewald H.; Wildt, J{ü}rgen; Winter, R.; Zabel, Friedhelm
Mechanisms of perhydroxyl HO\(_{2}\)(A\(^{2}\)A') excitation in various chemical systems
The Journal of Physical Chemistry, 87 (20) :3943-3948
1983
DOI: 10.1021/j100243a029; 84.
Holstein, K. J.; Fink, Ewald H.; Wildt, Jürgen; Winter, R.; Zabel, Friedhelm
Mechanisms of perhydroxyl HO2(A2A') excitation in various chemical systems
The Journal of Physical Chemistry, 87 (20) :3943-3948
1983
DOI: 10.1021/j100243a029; 83.
Wildt, J{ü}rgen; Fink, Ewald H.; Winter, R.; Zabel, Friedhelm
Radiative lifetime and quenching of SO(b\(^{1}\)\(\Sigma\)\(^{+}\),\(\nu\)'=0)
Chemical Physics, 80 (1-2) :167-175
1983
DOI: 10.1016/0301-0104(83)85177-5; 82.
Wildt, J{ü}rgen; Fink, Ewald H.; Winter, R.; Zabel, Friedhelm
Radiative lifetime and quenching of SO(b\(^{1}\)\(\Sigma\)\(^{+}\),\(\nu\)'=0)
Chemical Physics, 80 (1-2) :167-175
1983
DOI: 10.1016/0301-0104(83)85177-5; 81.
Wildt, Jürgen; Fink, Ewald H.; Winter, R.; Zabel, Friedhelm
Radiative lifetime and quenching of SO(b1Σ+,ν'=0)
Chemical Physics, 80 (1-2) :167-175
1983
DOI: 10.1016/0301-0104(83)85177-5; 80.
Wildt, J{ü}rgen; Bielefeld, M.; Fink, Ewald H.; Winter, R.; Zabel, Friedhelm
Radiative livetimes of the metastable b\(^{1}\)\(\Sigma\) states of SO, SeO, PCl and PBr
Bulletin des Sociétés Chimiques Belges, 92 (6-7) :523-524
1983; 79.
Wildt, J{ü}rgen; Bielefeld, M.; Fink, Ewald H.; Winter, R.; Zabel, Friedhelm
Radiative livetimes of the metastable b\(^{1}\)\(\Sigma\) states of SO, SeO, PCl and PBr
Bulletin des Sociétés Chimiques Belges, 92 (6-7) :523-524
1983; 78.
Wildt, Jürgen; Bielefeld, M.; Fink, Ewald H.; Winter, R.; Zabel, Friedhelm
Radiative livetimes of the metastable b1Σ states of SO, SeO, PCl and PBr
Bulletin des Sociétés Chimiques Belges, 92 (6-7) :523-524
1983; 77.
[german] Tausch, Michael W.
Strukturaufklärung in der organischen Chemie - Ermittlung der Strukturformeln von Maleinsäure und Fumarsäure
Praxis der Naturwissenschaften (Chemie), 32 :44
1983; 76.
Holstein, K. J.; Fink, Ewald H.; Zabel, Friedhelm
The \(\nu\)\(_{3}\) vibration of electronically excited HO\(_{2}\)(A\(^{2}\)A')
Journal of Molecular Spectroscopy, 99 (1) :231-234
1983
DOI: 10.1016/0022-2852(83)90307-7; 75.
Holstein, K. J.; Fink, Ewald H.; Zabel, Friedhelm
The \(\nu\)\(_{3}\) vibration of electronically excited HO\(_{2}\)(A\(^{2}\)A')
Journal of Molecular Spectroscopy, 99 (1) :231-234
1983
DOI: 10.1016/0022-2852(83)90307-7; 74.
Jensen, Per; Bunker, Philip R.
The application of the nonrigid bender Hamiltonian to a quasilinear molecule
Journal of Molecular Spectroscopy, 99 (2) :348-356
1983
DOI: 10.1016/0022-2852(83)90319-3; 73.
Jensen, Per; Bunker, Philip R.
The application of the nonrigid bender Hamiltonian to a quasilinear molecule
Journal of Molecular Spectroscopy, 99 (2) :348-356
1983
DOI: 10.1016/0022-2852(83)90319-3; 72.
Jensen, Per; Bunker, Philip R.
The application of the nonrigid bender Hamiltonian to a quasilinear molecule
Journal of Molecular Spectroscopy, 99 (2) :348-356
1983
DOI: 10.1016/0022-2852(83)90319-3; 71.
Winnewisser, Brenda P.; Jensen, Per
The infrared spectrum of fulminic acid, HCNO, in the \(\nu\)\(_{4}\) fundamental region
Journal of Molecular Spectroscopy, 101 (2) :408-421
1983
DOI: 10.1016/0022-2852(83)90145-5; 70.
Winnewisser, Brenda P.; Jensen, Per
The infrared spectrum of fulminic acid, HCNO, in the \(\nu\)\(_{4}\) fundamental region
Journal of Molecular Spectroscopy, 101 (2) :408-421
1983
DOI: 10.1016/0022-2852(83)90145-5; 69.
Winnewisser, Brenda P.; Jensen, Per
The infrared spectrum of fulminic acid, HCNO, in the ν4 fundamental region
Journal of Molecular Spectroscopy, 101 (2) :408-421
1983
DOI: 10.1016/0022-2852(83)90145-5; 68.
Jensen, Per
The nonrigid bender Hamiltonian for calculating the rotation-vibration energy levels of a triatomic molecule
Computer Physics Reports, 1 (1) :1-55
1983
DOI: 10.1016/0167-7977(83)90003-5

Computational Magnetics

Research Questions

Cooperation

Former and ongoing projects

Publications

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