PMsquare dead end...

[harti@xxxxxxxxx]

Hi All,
thanks a lot for all your help.
I see now, that the PMSquare as suggested
is a "dead horse".
It seems only to generate horizontal forces
due to the end conditions of the stator magnets....
It is also too complicated to be build for a real
linear motor.
Thus I am working now on a kind of Howard Johnson
like linear magnet motor, where the runner magnet
flies over a track of steel plates.
So the difference to the Howard Johnson design is,
that the stator track does not use any magnets but just steel
plates. The runner magnet above it uses special core pieces
so the magnet never locks in any position, but always
wants to move on to the side.
It just depends on the steel plate spacings versus air gaps
versus runner magnet dimension.

I am trying now to find the right dimensions, so that there is
always a positive force into the x-direction.

Regards, Stefan.



--- In femm@xxxx, David Meeker <dmeeker@xxxx> wrote:
> 
> 
> Dave Squires wrote:
> 
> > David,
> > I don't think I quite agree with your explanation.
> > If the two magnets are locked together and held
> > in the position shown you then have a
> >
> > Net force = +B*Q +(-B*Q) = 0
> >
> > if embedded in a uniform field. Isn't that correct?
> >
> > Dave Squires
> 
> That's exactly right--there is no net force on a permanent magnet 
in a uniform
> field.
> 
> Dave.