How to build circular induction coil in flux

Hi everyone,

I am trying to build a coil like this one like the pic shown below with 2000 turns:

I know it is impossible to build a specific geometry, so I tried building a solid body with a cut:

But when the solution finished, I always get this error, and the current density is the same everywhere on the coil (we know it should not be):

Can this solution be trusted? Does anyone know how to build a coil like this?

I saw an example called Wound Torus in the example tree. Should I build the coil like that by using several linked non meshed coils?

Thank you in advance,

Best regards!

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Karun Avula

Hi Magbee,

Yes go can use the model like wound torus with the non-meshed coil for modeling the turns around the tore where you can specify the number of turns as well. It looks similar to the first image you shared.

Thanks

Karun

Magbee H

Thank you for replying! I tried building the coil with the macro 'CoilAroundTorus.PFM'.

Do you Know what this 'spire number' means? I want to create a coil with 1000 turns. And I get 40 non meshed coils from this macro and each one has 25 turns(apparently they all add up to 1000 turns) . They are all connected to the same coil in the circuit with the same number of turns, which is the same to the 'spire number'=1.

I get all confused. Should I change the number of turns of the coil from 1 to 25 to make it corresponds to the real geometry for each non meshed coil?

In the circuit, there is alone one coil which is connected to 40 non meshed coils. Does this means 1 non meshed coil is in the circuit linked to this one resistor and a voltage source or 40 of them together are in the circuit linked to this one resistor and a voltage source?

Can you or someone please help me with this problem?

Thanks in advance.

Best regards!

1_Screenshot 2023-07-16 014011.png

Screenshot 2023-07-16 013823.png

Screenshot 2023-07-16 014011.png

SimonGuicheteau

Hello

I understand the confusion.

First you have a single circuit component for all coils. It is an easier solution but you could have one per turn if wanted.

Then the macro can create either a discrete or continuous coil around the torus :

the input "coil number" controls how many actual times the wire goes around the torus geometrically. Then the "number of spires" is a bit confusing but indicates how many turns you have in one coil.

To make it simple, in your case of 1000 turns you could do the extreme of representing 1000 coil numbers and 1 spire. This would be a lot of thin coil wires represented and probably not very useful. On the opposite you could also do 1 coil number and 1000 spires which would mean all 1000 wires are located in a single very thin wire.

So I suggest you define enough coil numbers to distribute the wire around the 360 degrees of the torus (let's say 50 as an example) so then the number of spires to choose is 20 so that you have 50*20 turns in total.

Magbee H

Hello

I understand the confusion.

First you have a single circuit component for all coils. It is an easier solution but you could have one per turn if wanted.

Then the macro can create either a discrete or continuous coil around the torus :

the input "coil number" controls how many actual times the wire goes around the torus geometrically. Then the "number of spires" is a bit confusing but indicates how many turns you have in one coil.

To make it simple, in your case of 1000 turns you could do the extreme of representing 1000 coil numbers and 1 spire. This would be a lot of thin coil wires represented and probably not very useful. On the opposite you could also do 1 coil number and 1000 spires which would mean all 1000 wires are located in a single very thin wire.

So I suggest you define enough coil numbers to distribute the wire around the 360 degrees of the torus (let's say 50 as an example) so then the number of spires to choose is 20 so that you have 50*20 turns in total.

Hi Simon,

Thank yo so much for this very detailed explanation, truly help a lot!

Best regards!