Modelling a simple transformer and defining custom equations using Comsol Multiphysics

This tutorial shows how a basic step-up transformer can be modelled in Comsol and how to define custom equations which can be used in the model. Physics variables can be used to define equations and you can apply operators such as integration, average, etc. In this example I compute the core loss due to hysteresis (eddy current loss in neglected). Winding copper loss is already defined and calculated by default in Comsol (mf.Qrh). You can also calculate it as 0.5(I^2)R over 1 cycle. A single plane of symmetry is used to reduce the model size.

00:00 Introduction
00:34 Geometry
04:00 Materials
04:49 Physics
08:37 Study
09:10 Defining custom equation
13:44 Results

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[JafScience]

Corrections:
(a) In the video I mistakenly selected only two regions in the core to calculate the core loss. You should select the entire core.

(b) At 18:00, the copper loss expression should be divided by two since the solution is in the frequency domain (sinusoidal current).

(c) I forgot to multiply the total core loss (PL_total) by 2. Since only half the geometry was modelled the total loss should be multiplied by 2.

[mohammadafnankhalid]

Bundle of thanks for making a video on my request.This is very helpful for me

[shumsamuel]

Why the integration just select the winding part but not the whole magnetic core?

[rameshbisht]

Can you tell me about adding the equation in the semiconductor module?

[rupreshadeb]

Thank you so much for the video sir.
I am facing a problem regarding "coil". I am trying to simulate in 2D geometry. And below the "coil", subsection named "Geometry analysis" is not coming in 2D. So I am unable to define the input and output of the coil.

While in 3D geometry the subsection below "coil" named "Geometry analysis" is coming so we are able to select input and output of the coil.

Please help me with this. How do I specify input and output of coil in 2D geometry?

[juandiegoperezumbarila]

It didn't work for me. Did you add something else to "Ampère's Law 1" and "Magnetic Insulation 1" ?

[alifryner]

Can you make tutorial about Simulation effect of harmonic current in copper busbar system in term of the temperature rise?

[leishakumar]

i am not getting fillet or chamfer option in my software. i have the comsol multiphysics 5.6

[PlayboyHZ]

You have set your operating frequency to 60Hz which you also specified in Steinmetz equation, but wouldn't you need to put the frequency as 0.06 since the frequency in Steinmetz is given in kHz?

[TheJPRG]

Why is the electrical conductivity of air equal to 1? Shouldn't it be equal to 0? Then again, I tried to put 0 and the model doesn't solve. Why is that?

[wejdanibrahem]

Very useful video, I want to ask you about how can I inserting lightning equation in comsol and how to Definition its variable?

[sohanrath]

How can I get a graph for this simulation in comsol ??

[PlayboyHZ]

I dont understand the meaning of scaling. What is the purpose of that and also did you add intersection for faster computing?

[obinnaonodugo]

Please, explain to me how you get that done because I'm getting only single green color with 0B graph

[eden]

Please help me to find a Fillet option while using the 3D model. It exists in the 2D approach but not in the 3D.

[AVANGuAR]

Any ways to ask you for a private consultation?

[AS-zsjw]

thankyou very much for this detailed video, i request you to please make a tutorial video for measuring high frequency ferrite core based high voltage transform, parasitics elements like leakage inductance and parasitic capacitance on both primary and seconday side of windings. thank you 👍

[porlanvors]

I'm facing a problem my version is 5.3.a the flow of flux at the core only matches you if I disable the secondary core and take out the primary coil region from the ferrite material but of course having deferent values of loses. my question is why if i took the ferrite the flux flow matches you and why I'm getting wrong flow when i keep it.

[fatmazahra]

if i draw coil (electric wire) which type of coil i use ??

[nurhaninabila]

Hi!
I need to design 3 phase transformer and need to fine thermal gradient and electric field.
Can u make an tutorial👉🏼👈🏼