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Coil with ferromagnetic core
HMagn4: Coil with ferromagnetic core
Sinusoidal voltage is applied to the electric coil with ferromagnetic core.
Problem Type:
Axisymmetric problem of AC magnetics.
Geometry:
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.
Given:
Magnetic permeability of the steel core μ - nonlinear;
Conductivity of the steel core g = 10,000,000 S/m;
Magnetic permeability of the winding μ = 1;
Conductivity of the winding (copper) g = 56,000,000 S/m;
Number of turns w = 120;
Applied voltage value U = 13.33 V;
Frequency f = 50 Hz.
Problem:
Determine the electric current within the coil winding.
Solution:
Current vs time plot in the real coil has non-sinusoidal shape (see TECircuit1 example). With AC magnetics module we can estimate RMS value much faster. The drawback of this approach is that we cannot estimate true wave form.
Results:
Problem |
Current (RMS value), A |
Current (wave form), A |
Transient |
34.1 |
48.1·sin(wt + 108°) + 3.2·sin(3wt + 147°) + 1·sin(5wt + 177°) |
AC magnetics |
35.3 |
49.9·sin(wt + 104°) |
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