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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Difference between 1 turn Multi-Turn Coil and Single Turn Coil

Posted Aug 2, 2014, 4:10 a.m. EDT Low-Frequency Electromagnetics Version 4.4 3 Replies

Akim Borbuev
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Hi all,

will there be any difference if i use Multi-Turn Coil with 1 turn or Single Turn Coil for a power cable conductor (copper)? Ideally there must not be any difference, however, I noticed that they give little different results when i evaluated Resistive Losses (252 W/m for Multi-Turn Coil with 1 turn and 257 W/m for Single Turn Coil). Therefore, Which one should i use?

Regards,
Akim
3 Replies Last Post Aug 5, 2014, 1:29 a.m. EDT
Jens Krause
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Posted: 10 years ago Aug 4, 2014, 2:22 a.m. EDT
Hi Akim,

are you working in 2D or 3D?

yes there is a difference. In a single turn coil the current density varies across the cross section whereas the
electric field is constant. For a multiturn coil is is the other way round.

In a DC application the difference in the magnetic field is often zero, but in AC you will see eddy currents in the single-turn coil but not for the multi-turn coil.

I suggest only to use multicoil domains when there are _many_ wires and when skin depth is larger than wire dimensions.

Regards

Jens
Hi Akim, are you working in 2D or 3D? yes there is a difference. In a single turn coil the current density varies across the cross section whereas the electric field is constant. For a multiturn coil is is the other way round. In a DC application the difference in the magnetic field is often zero, but in AC you will see eddy currents in the single-turn coil but not for the multi-turn coil. I suggest only to use multicoil domains when there are _many_ wires and when skin depth is larger than wire dimensions. Regards Jens
Akim Borbuev
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Posted: 10 years ago Aug 4, 2014, 2:35 a.m. EDT
Thank you for your response, Jens. I am working in 2D. So for solid conductor I should use Single Turn Coil and for stranded one I have to use Multi Turn Coil?
Thank you for your response, Jens. I am working in 2D. So for solid conductor I should use Single Turn Coil and for stranded one I have to use Multi Turn Coil?
Jens Krause
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Posted: 10 years ago Aug 5, 2014, 1:29 a.m. EDT
Yes, but if the skin depth is smaller than the dimensions of a single strand you should also consider building many single turn coils. Which means extra work, but sometimes the difference matters. Good luck, Jens.
Yes, but if the skin depth is smaller than the dimensions of a single strand you should also consider building many single turn coils. Which means extra work, but sometimes the difference matters. Good luck, Jens.

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