Re: PM design - Simulation results far from Prototype results....

["tonyrouget" <tonyrouget@xxxxxxxxx>]

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@xxxxxxxxxxxxxxx, Sven Olsen <a1greatdane@xxxx> 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@xxxx> 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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