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# Re: [FEMM] Solenoid charge

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- Subject: Re: [FEMM] Solenoid charge
- From: David Meeker <dmeeker@ieee.org>
- Date: Sun, 14 Mar 2004 12:49:33 -0500
- In-reply-to: <BAY14-F21FFf70DQLGJ00023138@hotmail.com>
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`yanze wuan wrote:`

> `Dear all,
> my problem is to simulate a solenoid charge by using both linear ramp of current and saw periodic shaped current profile. The calculaton should take into account the losses in coil and skin effect.
> Can somebody suggest any way to evaluate filed, current density distribution and losses by using femm and or lua ?`
> `Thanks Wuan`

`
As long as the materials are linear, you can break a periodic problem up into a series of problems at different frequencies and superimpose the results. For example, if you have a saw wave that goes from 0 to 1 with a period of T, the waveform could be represented by a DC problem with an amplitude of 1/2, plus the sum of AC problems with a current of: -(Sin[(2*n*Pi*t)/T]/(n*Pi)) for n from 1 to infinity. In terms of FEMM's time harmonic representation, that would be a currents of amplitude of j*(1/(n*Pi)) at a frequencies of (n/T) Hz.`

    --
    David Meeker
    dmeeker@ieee.org
    http://femm.berlios.de/dmeeker

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    - From: "yanze wuan" <yanzewuan@hotmail.com>

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