[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

# Re: Incorrect force direction

- To: femm@egroups.com
- Subject: Re: Incorrect force direction
- From: "Greg Watson" <gowatson@optusnet.com.au>
- Date: Mon, 01 Jan 2001 03:10:54 -0000
- In-reply-to: <92mthc+848k@eGroups.com>
- User-agent: eGroups-EW/0.82

    --- In femm@egroups.com, "Rob " <rtickle@v...> wrote:
    > 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,

    Removing one of the parallel bars eliminates the return flux path
    between the bars. This return flux direction between the bars is
    such that the magnet's own return flux will be in the same direction
    and thus in opposition. This is where the negative force (to the
    left) comes from. This force is correct and is present but is not
    the whole picture.

    The problem, as I see it, is that FEMM doesn't take into
    consideration how the magnet's flux distribution will be effected by
    the different working points encountered in the parallel bars. I
    think it assumes a symmetrical distribution where it should be skewed
    to the right. This should generate a positive (to the right) force,
    which should be must greated than the much weaker negative (to the
    left) repulsive force generated above.

    I'm sure David will work it out.

    Greg

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

- Prev by Date: Re: [femm] Re: Incorrect force direction
- Next by Date: Re: [femm] Re: Incorrect force direction
- Previous by thread: Re: [femm] Re: Incorrect force direction
- Next by thread: Re: Incorrect force direction
- Index(es):
  - Date
  - Thread