Photos attached. See my comments below. https://photos.google.com/photo/AF1QipMlej_5bSpRg2fZ6KbaTD7RYmQ0cgvU1RXC9BpX
> Vibrator ! Tue, 22 Mar 2016 17:04:38 -0700 > What are the relative polarities - are they axially or diametrically > polarised (poles on opposite faces or same face)? Both are axially polarized. Base magnet is disk D30x5 and two stacked D10x10. > Assuming axial magnetisation and that both are common permanent magnets, the > floating weight is levitated by reuplsion in apparent defiance of Earnshaw's > theorem (since, per Faraday's paradox, the fields themselves are effectively stationary). There are both repulsion and attraction.Earnshaw's theo. does not apply because the base magnet dipole axis is not aligned to rotation axis, angle is close to 85° and as you wrote it generate an alternative field. This allows a condition for Mathieu equation. > If OTOH one or both magnets are diamterically (or otherwise off-axially) > polarised, then we have an alternating field and Earnshaw doesn't apply. > If the former case is true, then are the magents a solid alloy type, or > sintered (ie. soft ferromagnets and NdFeB are usually sintered, the latter in > a chromed jacket)? Since this may influence the types of EMFs that could be > generated. Magnets are NdFeB grade N35 or lower. EMF or Eddies effects are negligible. This setup contains a static third magnet at top in order to support this long floating upright.See my YouTube page for detailed description: https://www.youtube.com/playlist?list=PL3KwdWTgl7fisd3h_tK1YLhFeuzkPATNt > Earnshaw also specifically applies to ferromagnetic (ie dipolar) interacatons > - if the system is complicated by paramagnetic or diamagnetic materials, > stable levitation is not precluded. > More info would be interesting! On Tue, Mar 22, 2016 at 10:03 PM, H Ucar > wrote: > That is while the base magnet attached to motor in a vertical axis > spinning clockwise, the floating magnet in air keeps spinning counter > clockwise in phase locked mode 1 cm above the base magnet. In order to > obtain this mode the floating magnet is initially forced to spin counter > wise using air jet. Once it gains enough speed it continues to spin by > itself by the 'negative' torque from the base magnet. > > Note that the floating magnet spin axis have small angular oscillation > locked to base magnet spin too. > >
