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# Re: [femm] Re: Incorrect force direction

- To: <femm@egroups.com>
- Subject: Re: [femm] Re: Incorrect force direction
- From: "Greg Watson" <gowatson@optusnet.com.au>
- Date: Mon, 1 Jan 2001 12:54:53 +1030
- References: <92mthc+848k@eGroups.com>

    ----- Original Message -----
    From: "Rob " <rtickle@visi.com>
    To: <femm@egroups.com>
    Sent: Sunday, December 31, 2000 7:46 PM
    Subject: [femm] Re: Incorrect force direction

    > Also noticed that if you take away the bottom steel bar, the force
    > is correctly calculated to be positive rightward, so it's something
    > about the 2nd bar being there...

    Hi Rob,

    I believe the problem is that FEMM is not taking into consideration the variable
    working point on the bars B/H curve as it calcs the field contours in the air
    between the magnet & the bar. The working point increases going from the left
    side above the magnet, to the right side above the magnet due to flux bunching
    from the flux being forced to make a abrupt turn to the right.

    Greg

- References:
  - Re: Incorrect force direction
    - From: "Rob " <rtickle@visi.com>

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