The Flyingmagnet©
What's that ?
An object named "Flyingmagnet", useless, seemingly... its most obvious duty being to take up its duty! This realization requires meticulousness and makes possible to apprehend unusual electric, magnetic and mechanical behaviours, which for some time should please any hobbyist familiar with electronics and metalwork, even model makers, moreover this object comprises an aesthetic dimension which can be developed according to the inspiration of each one.
The magnetic object floating over this base: in this geometry (identified as #1, 6 geometries are tested) that consists of 2 sets of 4 permanent magnets inside a brass tube of sizes :15 mm diameter by 150 mm length.
The whole is powered from a wall plug-in transformer (secondary 15 Vca).
Presentation of Flyingmagnet©
An aluminium base comprising the passive devices for the magnetic levitation (permanent magnets) and active devices for the stabilization consisting of a multiple purposes printed circuit, wired as an analogical servo controller and linked to adequate sensor as input and magnetic coils field as output. A flat drilled aluminum foil covering up this assembly.The magnetic object floating over this base: in this geometry (identified as #1, 6 geometries are tested) that consists of 2 sets of 4 permanent magnets inside a brass tube of sizes :15 mm diameter by 150 mm length.
The whole is powered from a wall plug-in transformer (secondary 15 Vca).
Natural stabilisation of magnetic suspension by Archimedes's principle
| Test jig in geometry #0 Obviously, the criteria defined in the following page are not respected. |
The sphère: D=68 mm, V=165 cm³ emerged weigth: approximately 170 g apparent weight in the chosed working range: approximately 70 g |
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The sphere: full of water (weight zero when fully immerged) is located under the object in suspension. The curve of variation of weight of the sphere in function of the immersion depth takes advantage on the curve of the attraction force in function of the distance between the magnets. Vice versa: an empty sphere, equipped with a magnet (geo #5, page "tech") can be anchored stably above a magnetic mass without material link. This is perhaps not a good idea to try that in an aquarium, the fish may lose the North. |
The neodymium magnets: sphere de 25,4 mm (1"), disc 25,4 mm x 6,35 mm (1" x 1/4") The adjustment at the middle of the operating range is done by sliding the main tube and the support of the magnet. Distance between magnets: 55 mm The stable position shown, allows a vertical swing of a magnitude of more than 2 cm without loss of control (falling of the magnet or his sticking to the ceiling, the damping is perfect! |
| Exemple: curve of the attraction force in function of the distance between the disc magnets. (25.4mm x 6,35mm - 1"x1/4") |
Exemple: curve of variation of weight of the sphere in function of the immersion depth. (sphere of 68 mm diam., full of water). |
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| It uses the right side of the curve. |
It uses the right side of the curve.
back to levitation page |
Some links to websites in English or in french that you perhaps do not know? (tech's page)
It seems appropriate not to make the first selection according to the language
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