- #1
bodkin77
- 10
- 0
G'day. I was wondering about the possibilities of making a permanent magnet hoverboard that levitates above a permanent magnet floor. They say that these new neodymium magnets can attract hundreds of kilos/pounds. Since repulsion and attraction forces are the same magnitude from what I hear, why couldn't they also lift hundreds of kilograms/pounds. Maglev trains use permanent magnets in Halbach arrays (one side is attractive like a fridge magnet and the other side is repulsive like, like.. the opposite of a fridge magnet?). see here... http://www.fastransitinc.com/halbach.html# . They are tilt stabilised by separate electromagnetic compensating systems, but on a hoverboard, I guess you could might be able to tilt stabilise by leaning or hanging onto something.
What exact forces are involved here in the vertical direction (not horizontal/tilt)? Obviously the force down (F=mg) needs to be equated with the forces up to solve for the equilibrium radius/distance. But what is the equation for the repulsion between 2 permanent magnets in Halbach arrays that have an r in it to find the equilibrium position? I think that permanent magnetism is ferromagnetism and it is the strongest, but what effect will other forces like paramagnetism and diamagnetism have on the setup? Maybe there's something that will make it completely impractical? Magnetic Saturation? Hysteresis?
Also, can the powerful neodymium magnets be bought as the 2 different types of Halbach arrays. Or maybe they have 2 poles and require bolting together into Halbach arrays?
Thanks
What exact forces are involved here in the vertical direction (not horizontal/tilt)? Obviously the force down (F=mg) needs to be equated with the forces up to solve for the equilibrium radius/distance. But what is the equation for the repulsion between 2 permanent magnets in Halbach arrays that have an r in it to find the equilibrium position? I think that permanent magnetism is ferromagnetism and it is the strongest, but what effect will other forces like paramagnetism and diamagnetism have on the setup? Maybe there's something that will make it completely impractical? Magnetic Saturation? Hysteresis?
Also, can the powerful neodymium magnets be bought as the 2 different types of Halbach arrays. Or maybe they have 2 poles and require bolting together into Halbach arrays?
Thanks
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