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# Re: [FEMM] Solenoid charge

- To: femm@list.foster-miller.net
- Subject: Re: [FEMM] Solenoid charge
- From: "yanze wuan" <yanzewuan@hotmail.com>
- Date: Fri, 19 Mar 2004 18:43:42 +0000
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`Many thanks for reply; the explanation was very exhaustive indeed!
One questions more, I wonder if, using non linear materials, there are some tricks to evaluate (approximate solution, linearization ...) to solve the time varying non linear problems and which are the parameters ( eddy currents, losses...) we can get with a certain reliability.`
`Any suggestion would be very appreciated, Thanks again for any contribution Bye Wang`
`
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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