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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.

Presentation of Flyingmagnet©

An aluminium or brass base comprising the passive devices for the magnetic levitation (permanent magnets) and active devices for the stabilization consisting of a 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 are tested, that consists of 2 sets of 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).

Original design
Positionning using optical sensor. (reflection & lateral reading).
Embase test jig,
Positionning using hall sensors. (lateral reading).
More complicated for the FLYINGMAGNET© concept More performing for the FLYINGMAGNET© concept

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Before going further ...

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 (full of water): D=68 mm, V=165 cm³
emerged weigth: approximately 170 g
apparent maximum weight in the chosed working range:
approximately 70 g
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 height of emerged part, 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 fishs may lose the North.
The neodymium magnets:
sphere: 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: approximately 55 mm (2")

The stable position shown, allows a vertical swing of a magnitude more than 2 cm (3/4") without losing control (falling of the magnet or stick to the ceiling), the damping is perfect!
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Active magnetic suspension stabilization by servo-controller

Two are better than one !
Sphere neodymium, diam: 19 mm (1/2") and a fragment of neodymium epoxy coated, spaced by approximately 50 mm (2").
The two spheres are suspended and linked magnetically. Moving one moves the other, removing one makes the other fall. The spherical form is absolutely not obligatory.

Some links to websites in English or in French.

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Last update: Oct 11 2017

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