Coupled inductor magnetizing current

Oscar_Mike619 · 2025-03-02T15:34:38+00:00

There was an error rendering this rich post.

Howdy PSIM users

I am using 3-winding coupled inductors in my model. There are current flags for the winding current which can be plotted, however there is no option to plot the magnetizing current.
I need to plot magnetizing current to look at the current ripple, and verify if my inductor design is correct.
Would appreciate any suggestions.

Find more posts tagged with

PSIM

Accepted answers

All comments

VSiddhartha

Hi,

Are you trying to separate magnetizing current and winding current?

Thank you,

Vishwanatha Siddhartha

Oscar_Mike619

Yes I am trying to separate them for plotting the current waveforms of winding and magnetizing currents.

NikosDimitrakopoulos

Dear User,

If you consider the following equivalent circuit for the coupled inductors:

Did you try to sum the currents measured with the current flags to calculate the magnetizing current [KCL at Lm branch]? I2 and I3 must be multiplied by their corresponding turns ratios. Additionally, depending on how the inductors are connected, you should carefully consider the current directions to determine whether to use a positive or negative sign when adding them.

Alternative:
To separate the magnetizing current, you could create a controlled source that replicates the primary voltage. Then set the L2 and L3 part with zero load (I2=0 and I3=0). This open-secondary test ensures that I1 = Im.

BR,

Nikos

Ovando_RBB

Hi there,

To enable PSIM to accurately predict the magnitude of the magnetization current, it’s essential to have:

A well-defined equivalent circuit of your magnetic system

A reliable estimate of the magnetization inductance

If you don’t have direct access to this data, there are two common approaches to obtain it:

Experimental Methods: Perform physical measurements, such as a short-circuit test or inductance measurement, to determine the magnetization characteristics.

Magnetic Simulation: Use electromagnetic simulation tools like Flux’s steady-state AC magnetic solver to model the magnetic field and extract the magnetization inductance virtually.

Hope this helps.