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# Re: [femm] H,B Vector Plots

- To: femm@yahoogroups.com
- Subject: Re: [femm] H,B Vector Plots
- From: Dave Squires <djsquires@plix.com>
- Date: Tue, 08 Apr 2003 08:50:20 -0700
- References: <3E8DCAA6.1010105@foster-miller.com> <3E92E891.1000101@ieee.org>
- User-agent: Mozilla/5.0 (Windows; U; Win 9x 4.90; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0

``
`David Meeker wrote:`

> `djsquires@plix.com wrote:`

> >     I would like to add that perhaps some arrows to show polarity or flux
> >     flow directions similar to Quickfield would be nice too. Otherwise we
> >     have to check the sign of the point properties to be sure of this. But
> >     first you have to click a point on the plot to get some point properties
> >     displayed.

> >     A simple visual cue like arrows would help. Then if you have the contour
> >     plot displayed you know instantly the flux flow polarities anywhere on
> >     the plot without having to click a point to get the point property
> >     display. This is qualitative information sure, but it is still valuable
> >     for double checking coil current polarity reversal mistakes and such.

> >     This can be an option that can be turned on or off or set as a default
> >     just like all the other display formats.

> >     Regards,
> >     Dave Squires

> > `alesteakira wrote:`

> > >     Is it possible to plot the vectors of H,B in FEMM
> > >     viewer? If not, do you think of including it in
> > >     future releases.?

> `I'd never included the vector plots (i.e. arrows indicating the strength and direction of flux density plotted at each grid points) simply because I've never found them to be that useful to me.`

    I wasn't suggesting true vector plots of direction and magnitude.
    I would agree that would just clutter things up.

> `It has always seemed to me that the density of such plots is too coarse to convey that much useful information. I could include them in a future release if there is generally a strong desire for this functionality.`
> `Alternatively, it might be useful just to superimpose arrow heads on the flux lines as they are currently plotted. The arrow heads indicate direction, and the density of the lines would indicate field strength (well, at least for 2D planar problems).`

    That is more what I was getting at, some quick display of flow
    direction...arrow head is positive (e.g. North) and tail is (negative
    or South). That would be perfect and give an instant qualitative
    check that you got the polarity right (or wrong). It provides an
    visual sanity check without having to activate point properties
    at each point possibly in question and check the X and Y signs.

`Dave S.`

> `Dave.`

``
``

- References:
  - Re: [femm] H,B Vector Plots
    - From: <dmeeker@foster-miller.com>
  - Re: [femm] H,B Vector Plots
    - From: David Meeker <dmeeker@ieee.org>

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