Coil with ferromagnetic core - QuickField simulation example
Sinusoidal voltage is applied to the electric coil with ferromagnetic core.
How to find current response of coils with ferromagnetic cores under AC excitation?
Engineering answer Typical applications Geometry
Given
Task
Solution
Results
Eddy currents distribution in the coil winding.
Engineering question
Set up an axisymmetric QuickField AC Magnetics problem for a coil with a ferromagnetic core and evaluate current response under AC excitation from computed field results.
ferromagnetic core coils, solenoid core windings, inductive magnetic coils
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Simulation problem
Problem Type
Axisymmetric problem of AC magnetics.
Number of turns w = 120
AC voltage value U = 13.33 V
Frequency f = 50 Hz.
Conductivity of the winding (copper) g = 56 MS/m;
Conductivity of the steel core g = 10 MS/m;
Magnetic permeability of the steel core μ - nonlinear:
Determine the electric current within the coil winding.
Due to the model symmetry only half of the coil is presented in the model. Therefore the circuit elements' values are defined twice less than in the real object.
Current vs. time plot in the real coil has non-sinusoidal shape and requires transient magnetic analysis. With AC magnetics module we can estimate RMS value much faster. The drawback of this approach is that we cannot estimate true wave form.
Problem
Current wave form, A
Transient
50.5·sin(wt + 108°) + 5.9·sin(3wt - 41°) + 3.9·sin(5wt + 148°)
AC magnetics
49.9·sin(wt + 104°)
AC current waveform and transient current waveform, calculated in transient magnetics example.
Video
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