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# Re: [femm] Coil with multiple turns

- To: femm@yahoogroups.com
- Subject: Re: [femm] Coil with multiple turns
- From: David Meeker <dmeeker@ieee.org>
- Date: Mon, 08 Apr 2002 11:53:11 -0400
- References: <a8s6og+11en@eGroups.com>
- User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.9) Gecko/20020311

`milanhampl wrote:`

>     Hi,
>     I'm working on my diploma theses and using FEMM for some computations.
>     I model a field of gap in toroidal magnetic soft ferrit. The only
>     thing I need, is how to model coil with multiple turns. I've tried to
>     make the coil like a block with a circuit property, but I read about
>     this and it should model only one turn. We know the curent in coil
>     and a number of turns, but don't how to make a model. I'm sending an
>     example, if you would like to make more accurate idea about this
>     problem.
>     Thanks

> `Milan Hampl`

``
`Just assign the current to be the total number of amps*turns, rather than just the amps per turn.`
`If you are doing calculations at non-zero frequencies, it is also good to assign the conductivity of the region occupied by the coil to be zero. If the conductivity is assigned to be something non-zero, eddy currents are induced that redistribute the currents within the coil's cross-section, which is non-physical with a wound coil.`
`Dave.`
``

- References:
  - Coil with multiple turns
    - From: "milanhampl" <milanhampl@yahoo.co.uk>

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