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# Re: [femm] Magnetization circumferencely

- To: femm@egroups.com
- Subject: Re: [femm] Magnetization circumferencely
- From: "C.Prem Kumar" <prem@rnd.bhel.co.in>
- Date: Fri, 08 Sep 2000 13:50:07 +0530
- References: <8p8jq2+m57s@eGroups.com>

Jason,

There is a peculiarity to the problem.

Firstly one would be tempted to dub the problem as axisymmetric i.e you solve in R-Z plane with the excitation currents directed in the theta direction. But THAT IS NOT CORRECT ! the excitation winding does not comply to axisymmetric situation. Strictly speaking, the problem can only be solved in a 3-D formulation.

Secondly, even if your toroidal core has a very very large radius, you still cannot simplify the problem to tackle it as a standard 2-D Cartesian Rectangular co-ordinate system ! This is because the excitation winding does not really exist beyond a finite length whereas the core does.

I would still appreciate if you could spell out your application. May be we can resolve it some other simpler way.

C.Prem Kumar

wilsons@avonil.net wrote:

> `Hi I am a new user of femm and am trying to get a circular donut`
> `magnatized cicumferencely and am having a hard time figuring out how`
> `to do this. I am a senior level college physics student and have`
> `tried everything that I could figure out. Any help in this would be`
> `greatly appreciated. Thanks in advance.`
> `Jason`

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- References:
  - Magnetization circumferencely
    - From: wilsons@avonil.net

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