How to use external current density in racetrack coil

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Hi all,

I need to analyze Electromagnetic force of racetrack coil with time dependent. To make this model, I use external current density. It has been confirmed that the external current density can be properly analyzed by time dependent analysis of circular coil. By using like those formula. Ix = I0-y/sqrt(x^2 + y^2), Iy = I0x/sqrt(x^2 + y^2), Iz=0

Now I try to analyze racetrack coil using external current density but I can't. I attached the file. Please give me your help and advice.

Thank you



4 Replies Last Post 2019. 7. 12. 오전 3시 38분 40초 GMT-4

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Posted: 5 months ago 2019. 7. 10. 오후 4시 22분 49초 GMT-4
Updated: 5 months ago 2019. 7. 10. 오후 4시 22분 59초 GMT-4

Hi,

Why don't you try using the Solid Conductor using the Coil feature to model the solid piece and compute the Lorentz Force?

BR/Nirmal

Hi, Why don't you try using the Solid Conductor using the Coil feature to model the solid piece and compute the Lorentz Force? BR/Nirmal


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Posted: 5 months ago 2019. 7. 11. 오전 1시 51분 18초 GMT-4
Updated: 5 months ago 2019. 7. 11. 오전 1시 49분 44초 GMT-4

Dear Nirmal,

Thank you for your reply. I want to use the Coil future but it cannot be used in time dependent.

Dear Nirmal, Thank you for your reply. I want to use the Coil future but it cannot be used in time dependent.


Cesare Tozzo COMSOL Employee

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Posted: 5 months ago 2019. 7. 11. 오전 10시 50분 22초 GMT-4
Updated: 5 months ago 2019. 7. 11. 오전 10시 49분 47초 GMT-4

Are you sure it is a single bulk conductor? If it is a bobbin (or if it is a bulk but you can assume constant resistivity as the pulse is slow... as could seem from your case given a fast look to parameters if it is not a multiturn) you can use multiturn. Transient 3D, current fed works out of the box for multiturn. This will include inductive effect averaged on the coil, but not local skin depth.

Have you already sent the model to support? If not, do it as we could help you as there is a couple of extra tricks for single turn, that you can use for current feeding time domain single turn conductor.

Cite a few. 1) add a voltage feed and se the voltage so to constrint current (in easy cases this is easy and works) 2) mix electric currents and magnetic fields as it is demoed in second part of https://www.comsol.com/model/rotating-machinery-3d-tutorial-10437 3) solution as https://www.comsol.com/model/geometry-optimization-of-a-3d-complex-shaped-coil-for-induction-heating-58051 where the feeding is put via a discontinuity on a "Magnetic Fields No Current" physics

Good luck

Cesare

Are you sure it is a single bulk conductor? If it is a bobbin (or if it is a bulk but you can assume constant resistivity as the pulse is slow... as could seem from your case given a fast look to parameters if it is not a multiturn) you can use multiturn. Transient 3D, current fed works out of the box for multiturn. This will include inductive effect averaged on the coil, but not local skin depth. Have you already sent the model to support? If not, do it as we could help you as there is a couple of extra tricks for single turn, that you can use for current feeding time domain single turn conductor. Cite a few. 1) add a voltage feed and se the voltage so to constrint current (in easy cases this is easy and works) 2) mix electric currents and magnetic fields as it is demoed in second part of https://www.comsol.com/model/rotating-machinery-3d-tutorial-10437 3) solution as https://www.comsol.com/model/geometry-optimization-of-a-3d-complex-shaped-coil-for-induction-heating-58051 where the feeding is put via a discontinuity on a "Magnetic Fields No Current" physics Good luck Cesare


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Posted: 5 months ago 2019. 7. 12. 오전 3시 38분 40초 GMT-4
Updated: 5 months ago 2019. 7. 12. 오전 3시 38분 3초 GMT-4

Dear Cesare,

Thank you for your answer, Cesare. I really appreciate your kind support. My coil shape is like a bobbin. I can use the multiturn in the Coil feature with time dependent but I can't solve it yet.

I'm goin to read those and try a little more. If I can't solve it, I will send the model to support and ask your help.

Thanks!!

Dear Cesare, Thank you for your answer, Cesare. I really appreciate your kind support. My coil shape is like a bobbin. I can use the multiturn in the Coil feature with time dependent but I can't solve it yet. I'm goin to read those and try a little more. If I can't solve it, I will send the model to support and ask your help. Thanks!!

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