Coil with ferromagnetic core - QuickField simulation example
This is an example of the coil with ferromagnetic core simulation, performed with QuickField software.
How to find transient current in coil with ferromagnetic core?
Answer Typical applications Geometry Given
Task
Solution
Results
Engineering question
Set up an axisymmetric QuickField Transient Magnetics problem for a coil with a ferromagnetic core and evaluate transient current from computed field results.
ferromagnetic core coils, magnetization transient coils, nonlinear magnetic inductors
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Simulation problem
Problem Type
Axisymmetric problem of transient magnetics.
Conductivity of the steel core g = 10 MS/m;
Conductivity of the winding (copper) g = 56 MS/m;
Number of turns w = 120;
Applied voltage value (amplitude) U = 10√2 V;
Frequency f = 50 Hz.
Magnetic permeability of the steel core μ - nonlinear:
Determine the electric current within the coil winding.
Due to the model symmetry only the right half of the coil is presented in the model (shown by upper half of its cross-section). Therefore the circuit elements' values are defined twice less than in the real object.
The current wave period is T = 1 / f = 0.02 sec. We choose the time step of 0.0005 second that guarantees a smooth plot. The finishing time 0.2 sec includes 10 periods and is long enough to fade out initial transient currents. To reduce the results file size only the last period is stored (starting from moment 0.18 sec).
The fundamental harmonic approximation of the current in the winding is: I(t) = 51.5 · sin(t·2π/T + 108°)
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