Alt-BEAM Archive

Message #04324



To: "'beam@sgiblab.sgi.com'" beam@sgiblab.sgi.com
From: "van Zoelen, Bram SSI-TSEA-352" Bram.A.A.vanZoelen@is.shell.com
Date: Mon, 7 Jun 1999 13:42:28 +0200
Subject: [alt-beam] Re: BEAM forcefield....


The proposed idea was to make a border out of electromagnets that
could be turn on to pushback the robot when it come to close..

Bram


> ----------
> From: Bruce Robinson[SMTP:Bruce_Robinson@bc.sympatico.ca]
> Reply To: beam@sgiblab.sgi.com
> Sent: Thursday, June 03, 1999 9:02 PM
> To: beam@sgiblab.sgi.com
> Subject: Re: BEAM forcefield....
>
> "van Zoelen, Bram SSI-TSEA-352" wrote:
> >
> > So with magnetic pole will be facing inwards , North or South?
>
> Why have a pole face inwards? Have all the poles face up instead. Every
> magnet has the same pole facing up (e.g. north), including the ones on
> the robots. Arrange them so the tops and bottoms of each magnet are at
> approximately the same height; if your magnets are very thin between the
> poles, use a length of steel or iron rod to extend them.
>
> Now you have all the north poles on top and all the south poles on the
> bottom -- all repelling each other. The only concern is that very
> powerful magnets could flip a robot over on its back. However, with all
> the magnets the same height and same distance off the ground, the
> attractive distance between any two magnets would be greater than the
> repulsive distance (attraction is on a diagonal, repulsion is a straight
> distance). The robots would never get close enough to the "force field"
> to experience a strong "flipping" force. In theory. In practice, one
> rogue robot that managed to overturn could create a real mess.
>
> Think of it this way -- two levels of monopoles (one north, one south)
> on two different horizontal planes.
>
> Regards,
> Bruce
>

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