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# Re: [femm] Re: PM design - Simulation results far from Prototype results....

- To: femm@yahoogroups.com
- Subject: Re: [femm] Re: PM design - Simulation results far from Prototype results....
- From: Sven Olsen <a1greatdane@yahoo.com>
- Date: Tue, 24 Jun 2003 06:25:50 -0700 (PDT)
- In-reply-to: <bd9heq+kq2g@eGroups.com>

Dear Tony,
I take it we are talking about a circular airgap structure for a loudspeaker voice coil. You indicate 1.2 Tesla in this gap, but the steel pieces can very well be saturated - check with the cursor in femm for point properties and see what the reading are or lay a line contour through the steel. If you read more than 2 Tesla, there's a good chance your 1018 steel is saturated.
Best regards
tonyrouget <tonyrouget@yahoo.com> wrote:

> `Dear All,
> Thanks for your help and share of knowledge...
> 1)I am pretty sure about the Neo35H since I have the spec sheet and
> it's a reliable supplier,
> however I wasn't expecting the Steel to be one of my problem..Maybe I
> have too much saturation in my design..
> Is 1.2T saturated for 1018 steel ?? I thought it was a bit higher for
> the 1018..
> Thanks for your help.
> Regards
> Tony
> --- In femm@yahoogroups.com, Sven Olsen <a1greatdane@y...> wrote:
> > Dear Tony,
> > the results I have with using femm indicates that some thing else
> is wrong in your real world implementation. My real world results is
> normaly at max 5% out from the simulations. Are you sure about your
> quality of steel? It only takes a small lead contenst to render the
> magnetic quality of the steel virtually useless. How about the
> quality of the neo? You say 35N, but are you sure? There's many
> qualities comming out of 'ping-pong land'. Is the neo fully and
> optimally magnetized? It takes a very serius magnetizer to fully
> charge the circuit.
> > Best regards
> > A1greatdane
> >
> > tonyrouget <tonyrouget@y...> wrote:
> > Dear All,
> >
> > First of all, thanks David for your great software!!
> >
> > I have a quick question:
> >
> > Did anybody already experienced any problems to relate Femm
> > simulation results with the real world??
> >
> > And if Yes, what could be the cause of the simulation error.???
> >
> > In other words, I have designed a loudspeaker motor assembly with
> > Neodymium 35 and I was expecting 1.2 to 1.4T in the airgap.
> > Confident of my design and simulation results I built a prototype
> and
> > could only get 0.8T Maximum in my Airgap with the Gaussmeter..
> >
> > I am using 1018 Steel and Neo 35H. I've been inputing the tech
> specs
> > of my magnet and editing a new model in my library..
> >
> > If you had already experienced simulation problems, please give me
> > your input..
> >
> > Regards
> > Tony
> >
> >
> >
> >
> >
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> >
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    - From: "tonyrouget" <tonyrouget@yahoo.com>

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