|MadSci Network: Physics|
I am doing a STUDY of EM drag force between a moving conductor and a permanent magnet. I understand that a conductor moving with a velocity v over a permanent magnet will experience a REPULSIVE force. The formula for that force is as follows: Lift force = (Mu*I*I/4*pi*h)(v*v/(v*v + w*w)) Drag Force = (w/v)*Lift Force w=2/(mu*sigma*delta) Mu = magnetic permeabilty of vacum I = Current generated in conductor h = separation between permagnet and conductor v = velocity of conductor w = charateristic velocity sigma = conductivity of conductor delta = conductor thickness. w = The velocity where the EM DRAG is maximum w=2/(mu*sigma*delta) The formula shows that the charateristic velocity varies inversley with the thickness of the conductor. This means: 1. If thickness approaches ZERO w approaches infinity! 2. If thickness approaches infinity w approaches zero! Are these deductions correct.? What part does the EDDY CURRENT penetration depth plays in this?
Re: maglev - the em drag between a moving conductor and a magnet
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