par Padawan » 12/12/06, 16:17
Iota,
tu ne peux refermer le champ magnétique sur lui même car
il s'annulerait....Sauf dans la configuration Halbach ,c'est celle que j'emploi, je te joins quelques explications par images que j'envoie
généralement sur mon accélérateur magnétique " Rampe".
A plus
Le texte que je joins avec ma manip : (en Anglais)
Car la plupart sont américains….
Magnetic Launcher
The device is made of a rail fitted with magnets. The rail could be in aluminium and the magnets are fixed below. The most important point is the positioning of the magnets. They must present the same magnetic pole on one side, for the entire row. For example, all magnets on the left side must present the south pole and all magnets on the right side the north pole. In the experiment shown in the video, small cubic magnets have been used but it is also possible with cylindrical magnets. If the two poles are on each face, the magnets have to be placed vertically, as if they were wheels. The space between the magnets is not so critical, but in order to get a good acceleration they must be close enough of each other. It depends of the strength of the magnets, for our experiment they were placed approximately each 5 mm (1/5”).
Then at the end of the rail, two magnets are used instead of one. This is to stop the sphere magnet motion with a stronger magnetic field.
The glass sphere (marble) is placed just before the ending magnets of the rail, so that the magnet sphere hits it with its maximum speed. While the magnet sphere is stopped by the magnetic trap, the marble is ejected from the launcher.
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