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.
2D Simulation of a Transformer
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
- 1994
493.
Auwera, J. Vander; Holland, J. K.; Jensen, Per; Johns, John W. C.
The \(\nu\)\(_{6}\) band system of C\(_{3}\)O\(_{2}\) near 540 cm\(^{-1}\)
Journal of Molecular Spectroscopy, 163 (2) :529-540
1994
Herausgeber: Academic Press492.
Auwera, J. Vander; Holland, J. K.; Jensen, Per; Johns, John W. C.
The \(\nu\)\(_{6}\) band system of C\(_{3}\)O\(_{2}\) near 540 cm\(^{-1}\)
Journal of Molecular Spectroscopy, 163 (2) :529-540
1994
Herausgeber: Academic Press491.
Breidohr, R.; Shestakov, Oleg; Fink, Ewald H.
The a \(^{3}\)\(\Sigma\)\(^{+}\) (a\(_{1}\) 1) → X \(^{1}\)\(\Sigma\)\(^{+}\) (X 0\(^{+}\)) Transitions of BiP, BiAs, and BiSb
Journal of Molecular Spectroscopy, 168 (1) :126-135
1994
Herausgeber: Academic Press490.
Breidohr, R.; Shestakov, Oleg; Fink, Ewald H.
The a \(^{3}\)\(\Sigma\)\(^{+}\) (a\(_{1}\) 1) → X \(^{1}\)\(\Sigma\)\(^{+}\) (X 0\(^{+}\)) Transitions of BiP, BiAs, and BiSb
Journal of Molecular Spectroscopy, 168 (1) :126-135
1994
Herausgeber: Academic Press489.
Breidohr, R.; Setzer, Klaus-Dieter; Shestakov, Oleg; Fink, Ewald H.; Zyrnicki, W.
The a \(^{3}\)\(\Sigma\)\(_{u}\)\(^{+}\) (a\(_{1}\) 1\(_{u}\)) → X \(^{1}\)\(\Sigma\)\(_{g}\)\(^{+}\) (X 0\(_{g}\)\(^{+}\)) Transition of Bi\(_{2}\)
Journal of Molecular Spectroscopy, 166 (2) :251-263
1994
Herausgeber: Academic Press488.
Breidohr, R.; Setzer, Klaus-Dieter; Shestakov, Oleg; Fink, Ewald H.; Zyrnicki, W.
The a \(^{3}\)\(\Sigma\)\(_{u}\)\(^{+}\) (a\(_{1}\) 1\(_{u}\)) → X \(^{1}\)\(\Sigma\)\(_{g}\)\(^{+}\) (X 0\(_{g}\)\(^{+}\)) Transition of Bi\(_{2}\)
Journal of Molecular Spectroscopy, 166 (2) :251-263
1994
Herausgeber: Academic Press487.
Breidohr, R.; Shestakov, Oleg; Fink, Ewald H.
The a \(^{3}\)\(\Sigma\)\(_{u}\)\(^{+}\)(a\(_{1}\) 1\(_{u}\)) → X \(^{1}\)\(\Sigma\)\(_{g}\)\(^{+}\) (X 0\(_{g}\)\(^{+}\)) transition of Sb\(_{2}\)
Chemical Physics Letters, 218 (1-2) :13-16
1994486.
Breidohr, R.; Shestakov, Oleg; Fink, Ewald H.
The a \(^{3}\)\(\Sigma\)\(_{u}\)\(^{+}\)(a\(_{1}\) 1\(_{u}\)) → X \(^{1}\)\(\Sigma\)\(_{g}\)\(^{+}\) (X 0\(_{g}\)\(^{+}\)) transition of Sb\(_{2}\)
Chemical Physics Letters, 218 (1-2) :13-16
1994485.
Breidohr, R.; Setzer, Klaus-Dieter; Shestakov, Oleg; Fink, Ewald H.; Zyrnicki, W.
The a 3Σu+ (a1 1u) → X 1Σg+ (X 0g+) Transition of Bi2
Journal of Molecular Spectroscopy, 166 (2) :251-263
1994
Herausgeber: Academic Press484.
Breidohr, R.; Shestakov, Oleg; Fink, Ewald H.
The a 3Σu+(a1 1u) → X 1Σg+ (X 0g+) transition of Sb2
Chemical Physics Letters, 218 (1-2) :13-16
1994483.
Breidohr, R.; Shestakov, Oleg; Fink, Ewald H.
The a 3Σ+ (a1 1) → X 1Σ+ (X 0+) Transitions of BiP, BiAs, and BiSb
Journal of Molecular Spectroscopy, 168 (1) :126-135
1994
Herausgeber: Academic Press482.
Shestakov, Oleg; Fink, Ewald H.
The a\(^{1}\)\(\Delta\)(a2) state of BiF
Chemical Physics Letters, 229 (3) :273-278
1994481.
Shestakov, Oleg; Fink, Ewald H.
The a\(^{1}\)\(\Delta\)(a2) state of BiF
Chemical Physics Letters, 229 (3) :273-278
1994480.
Shestakov, Oleg; Fink, Ewald H.
The a1Δ(a2) state of BiF
Chemical Physics Letters, 229 (3) :273-278
1994479.
Tashkun, Sergey A.; Jensen, Per
The low-energy part of the potential function for the electronic ground state of NO\(_{2}\) derived from experiment
Journal of Molecular Spectroscopy, 165 (1) :173-184
1994
Herausgeber: Academic Press478.
Tashkun, Sergey A.; Jensen, Per
The low-energy part of the potential function for the electronic ground state of NO\(_{2}\) derived from experiment
Journal of Molecular Spectroscopy, 165 (1) :173-184
1994
Herausgeber: Academic Press477.
Tashkun, Sergey A.; Jensen, Per
The low-energy part of the potential function for the electronic ground state of NO2 derived from experiment
Journal of Molecular Spectroscopy, 165 (1) :173-184
1994
Herausgeber: Academic Press476.
Jensen, Per; Bunker, Philip R.
The Molecular Symmetry Group for Molecules in High Angular Momentum States
Journal of Molecular Spectroscopy, 164 (1) :315-317
1994
Herausgeber: Academic Press475.
Jensen, Per; Bunker, Philip R.
The Molecular Symmetry Group for Molecules in High Angular Momentum States
Journal of Molecular Spectroscopy, 164 (1) :315-317
1994
Herausgeber: Academic Press474.
Jensen, Per; Bunker, Philip R.
The Molecular Symmetry Group for Molecules in High Angular Momentum States
Journal of Molecular Spectroscopy, 164 (1) :315-317
1994
Herausgeber: Academic Press473.
Bednarek, G.; Wayne, R.P.; Wildt, J{ü}rgen; Fink, E.H.
The yield of O\(_{2}\)(b \(^{1}\)\(\Sigma\)\(_{g}\)\(^{+}\), v=0) produced by quenching of O\(_{2}\)(A \(^{3}\)\(\Sigma\)\(_{u}\)\(^{+}\), v=8) by O\(_{2}\)
Chemical Physics, 185 (2) :251-261
1994472.
Bednarek, G.; Wayne, R.P.; Wildt, J{ü}rgen; Fink, E.H.
The yield of O\(_{2}\)(b \(^{1}\)\(\Sigma\)\(_{g}\)\(^{+}\), v=0) produced by quenching of O\(_{2}\)(A \(^{3}\)\(\Sigma\)\(_{u}\)\(^{+}\), v=8) by O\(_{2}\)
Chemical Physics, 185 (2) :251-261
1994471.
Bednarek, G.; Wayne, R.P.; Wildt, Jürgen; Fink, E.H.
The yield of O2(b 1Σg+, v=0) produced by quenching of O2(A 3Σu+, v=8) by O2
Chemical Physics, 185 (2) :251-261
1994470.
Auwera, J. Vander; Holland, J. K.; Jensen, Per; Johns, John W. C.
The ν6 band system of C3O2 near 540 cm-1
Journal of Molecular Spectroscopy, 163 (2) :529-540
1994
Herausgeber: Academic Press- 1993
469.
Janssen, H. H. J. M.; Maten, E. J. W.; Houwelingen, D.
Simulation of coupled electromagnetic and heat dissipation problems
, IEE, Colloquium on Coupling Electromagnetic to Other FieldsBand1993 / 117, Seite 3/1-3/3
Herausgeber: Institute of Electrical and Electronics Engineers ({IEEE})
Mai 1993
