Re: [femm] line integral and antiperiodic BC

[razaq hadi <razaq97@xxxxxxxxx>]

dear sir 
your's example very interesting for PM motor, therefor
I hope to send to me more detailies, but in the field
of SRM simmulation. What you think student versia
enigh to this task or not thinks for all. 

your's razaq
--- vecerkaj@xxxxxxx wrote:
> Hi everybody
> I've met the problem with simple line integral
> calculating the total flux and
> average Bn. I posted example, where the situation
> occured. It presents a PM
> synchronous machine (only half of machine, used
> antisymetric BC) 
> When I chose the contour for the calculation of
> average Bn over one rotor pole
> in the airgap (see example.gif) I realized, that the
> result depends on the
> way, how I selected a contour for the calculation. 
> 1. When the startpoint is selected inside of the
> region and endpoint is on the
> boundary (antisimetric BC), the result is Bn1=0
> (nonsense).
> 2. When the startpoint is selected on the boundary,
> and endpoint is inside the
> airgap, the result of line integral is certain value
> Bn2=nonzero.
> 3. When I choose the contour arbitrary (by right
> button of mouse) in the
> similar location and I obtain the different value of
> the Bn3 (Bn3=2*Bn2).
> 
> It seems, that correct value of Bn is the value Bn3.
> But I expected the same
> values obtained by different ways(except sign).
> 
> If anybody interested, I included also fem file.
> Maybe I make all the time
> same stupid mistake, can anybody show me the right
> way or a reason of
> differences?
> 
> Note the example uses linear characteristic of iron,
> just because of
> computation speed (in reality I use nonlinear BH
> characteristics).
> 
> Thanks in advance
> 
> George Vecerka
> Department of power electric and electronic
> Faculty of Electrical Engineering and Computer
> Science
> Brno University of Technology
> Czech Republic
> 
> 
>
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> 

> ATTACHMENT part 2 application/octet-stream
name=example1.fem


> ATTACHMENT part 3 image/gif name=example1.gif



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