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# Re: [femm] line integral and antiperiodic BC

- To: femm@yahoogroups.com
- Subject: Re: [femm] line integral and antiperiodic BC
- From: razaq hadi <razaq97@yahoo.com>
- Date: Sat, 16 Jun 2001 01:52:32 -0700 (PDT)
- In-reply-to: <20010614141913.10044.qmail@nwcst336.netaddress.usa.net>

    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@usa.net 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
    >
    >
    >
    ____________________________________________________________________
    > Get free email and a permanent address at
    > http://www.netaddress.com/?N=1
    >

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

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

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- References:
  - line integral and antiperiodic BC
    - From: <vecerkaj@usa.net>

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