How do I calculate the Temperature rise in the Ferrite core?

[Gowda1]

Hello,

This question might seem basic but I would like to state it. I would like to calculate the operating/Rise temperature of the ferrite core of an inductor. I am modelling my own bobbins for the core so I need to decide on the material/filament to use for 3D printing which can take the temperature of the core without causing any damage or melting of the bobbins. I looked into it but could not get the answer I am looking for. Inductor specifications which might be useful for better understanding: E70 core N87 material, v= 450VRMS, I=40A, f=85khz, Litz wire for the windings, distributed air gap on each leg. I attach the datasheet as well. Please help me with this, any links or any articles would be great too. Thank you

https://www.tdk-electronics.tdk.com/inf/80/db/fer/e_70_33_32.pdf

[Mazo]

Estimate all the losses in the transformer,one way or another.
Click here:
http://encyclopedia-magnetica.com/doku.php/thermal_resistance_of_ferrite_cores

[TimNJ]

It's a nice exercise to try to calculate total inductor loss (core/hysteresis loss and copper loss) and to use core volume to estimate temperature rise...

Depending on how accurate your calculations are, it might just be betterto just print it out of the best material you have access to and check the temperature rise with thermocouple, IR, etc.

distributed air gap on each leg

Also, I think you had another thread talking about gapping all three legs, right? Just another reminder that this does not make it a distributed air-gap (it's not powder/alloy core), and please be mindful of gapping the outer legs for fringing fields/EMI control.

[Gowda1]

Hey, This does not take any power ratings. it just gives out the losses. I dont know if this is right

[temperance]

Maybe an old unitrode app note can help you:

SLUP126: https://www.ti.com/lit/ml/slup126/slup126.pdf