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Inductor inrush current stress

QuickField simulation example

AC voltage source is connected to the inductor. Then AC power is applied, inrush current may be considerably higher than regular, and corresponding magnetic forces may cause higher mechanical stresses in the inductor assembly.

Engineering question
How to find inrush current and mechanical stress in inductors

Engineering answer
Set up an axisymmetric QuickField Transient Magnetics problem for an inductor and evaluate inrush current and mechanical stress from computed field results.

Typical applications
ferromagnetic core inductors, power inductors, surge-current inductors

Problem Type
Axisymmetric multiphysics problem of transient magnetics coupled to stress analysis.

Geometry
Inductor inrush current stress AC voltage source is connected to the inductor Core Insulation Winding AC 18 V ~ 31 mm 38 mm Ø 12 mm Ø 36 mm

Given
Relative magnetic permeability of the steel core μ=2000;
Electric conductivity of the winding (copper) g = 56 MS/m;
Number of turns w = 600;
Applied voltage value (amplitude) U = 18√2 V;
Frequency f = 60 Hz.

Task
Calculate the peak current value and mechanical stress in the inductor winding.

Solution
The current wave period is T = 1 / f = 16 ms. We choose the time step of 1 ms that guarantees a smooth time-plot. Nine periods are simulated (150 ms).

Results
The peak current value is 1.8 A (+65% to the rated value) appears 7ms after switching the voltage on. The color map of mechanical stress in the coil is shown below.
Inductor inrush current stress