Learning Forum

[Mohendro Ghosh]

Hi, Good People, 

Is there anyone with experience in ohmic loss calculation for a high-frequency nanocrystalline core transformer or any other transformer design?

I am facing some issues confirming the results I am getting from the simulation. Please reply to me here so that I can ask more specifically. or you can reply me at mkg57@pitt.edu

 

Thanks in advance. 

Mohendro.   

[GLUO]

Hi,

A kind reminder that this forum is for simulation tool usage only. You can use the core loss formula to do a rough estimation. 

GL

[Mohendro Ghosh]

Hi GL, thanks for your reply. 

I am using Ansys Maxwell Tools to simulate and leakge core loss evaluation. 

This core loss should be calculated from the amount of leakage flux produced in shorted secondary condition of high frequency transformer. 

So, this core loss calcuation will not follow any formula like Steinmetz Eqn. etc. 

The Ohmic loss moedl shows something similar to the core loss in laminated cores. So, I am using this method. 

But unfortunately I am getting very bery low core loss as leakge core loss in laminated part. 

Do you have nay thoughts on that? Please let me know. 

Best

Mohendro. 

 

[HDLI]

Hello Mohendro,

      Could you show the defination of material properties? Do you use eddy effect to calculate this loss? 

      What is the ohmic loss model that you mentioned? 

      We could use "power ferrite" of C*f^x*B^y to simulate the core loss and 24R1 version supports custom core loss equations.

HDLI       

 

[Mohendro Ghosh]

Hi HDLI,

Thanks. I have allatched the material definition and also anlysis set up for my simulation which define shorted secondary conditon to evaluate leakage flux  and leakage core loss. Another screen shot is for Ohmic loss model definition. 

Power ferrite equation is used for magnetizing core loss calculation. So, I am not sure that for leakage core loss calculation, we can use Steinmetz eqn or not?? Can you plase confirm this? Thanks.

 

[Mohendro Ghosh]

[Mohendro Ghosh]

[HDLI]

Hello Mohendro,

     It should use electrical steel in core loss model, not in eddy effect, because it is laminated materail. I am not sure what is your real meaning of leakage flux, but we could not seperate leakage and magnetization flux. Both flux will generate the core loss, not only by the leakage flux.

     Please seperate the leakage and magnetization flux components by using equations of analytics method. 

HDLI     

 

[Mohendro Ghosh]

Hi HDLI,

I am also not sure that the leakge flux in core can only be calculated or nor by Ansys Maxwell. But we can follow a method in transformer design, that when the secondary coil is shorted then there will be no flux linkng the secondary, and all fluxes flows through primary. These amount of flux are know as leakage flux. So, we can easily calculate the leakage flux by implementing this condition. 

I dont know what is "equation of analytics method" ? can you explain this to me how can I use this in asnys? any documents? 

Thanks. 

Mohendro. 

 

[HDLI]

Hello Mohendro,

      OK. "equation of analytics method" looks like to calculate leakge flux or inductance by using equations, not in Maxwell. I think you could find some papers related to it.

      Please do short circuit simulaiton to estimate the core loss due to leakge flux while using rated current, and simulate open circuit to estimate the core loss due to magnetization flux. It may not be perfect, but we might present the core losses due to both flux. Thanks.

HDLI

[Mohendro Ghosh]

Hi HDLI, 

Thanks. yes, I am doing the same as you have suggested.

In open circuit, I am using Steinmetz Eq. for magnetizing core loss calculaiton with "Power Ferrite" loss option in ansys. 

Can you answer me the below questions: 

1. what do you mean by using rate current? Does it mean, I should use current source both in primary and seconary?
2. As you noticed, I am assuming "Ohmic Loss" as induced eddy current loss in core due to leakage flux (by field calculator). Am I in right path to calculate this considering Ohmic Loss? Also, I am getting same amount of loss as "Solid Loss". Are these two the same things? please explain me.

Thanks

Mohendro.