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# [FEMM] velocity & energy for LG!

- To: Finite Element Method Magnetics mailing list <femm@list.foster-miller.net>
- Subject: [FEMM] velocity & energy for LG!
- From: Ahmad Eid <ahmad_m_eid@yahoo.com>
- Date: Thu, 16 Oct 2003 17:44:19 -0700 (PDT)
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Dear all
Actually I simulate linear generator by femm, so sometimes without current when calculating the cogging force. I know only that the average speed of mechanical part or the translator will move by an average speed of (Vx m/s) for example. From femm I get the force vs positions of the translator.
1- Is there a way to calculate the actual velocity (velocity vs time or position) from force vs position and average speed for the linear generator?
2- How can I calculate energy vs position for the linear generator?
can anyone help me in these problems?
thanks you all for your help
ahmad
David Meeker <dmeeker@foster-miller.com> wrote:

> Ahmad Eid wrote:

> > Dear all
> > I use femm and lua scripts to calculate the force for linear machine.
> > I just move the translator and then calculate.
> > Is there a way to calculate the velocity of the translator?
> > and how can I calculate the kinetic energy in this case?
> > any suggetion or any site will be good
> > thanx all
> > ahmad

> To find velocity, you have to have some equations of motion for the mechancial system that the force is driving. It is possible to integrate these equations numerically inside your lua script that does force vs. position, or you could take your force vs. position & current information and use them as input to a separate program in which you integrate the equations of motion.
> Dave.

>     --
>     David Meeker
>     Senior Engineer
>     Foster-Miller, Inc.
>     350 Second Avenue
>     Waltham, MA 02451-1196
>     781-684-4070
>     781-890-3489 (fax)
>     dmeeker@foster-miller.com

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  - Re: [FEMM] velocity calculation
    - From: David Meeker <dmeeker@foster-miller.com>

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