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Is the Matlab magnetic levitation model example correct?

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Mat
Mat 2014-1-20
回答： David Sanchez 2014-1-20
Hello.
I don't know what to think. The maglev mathematical equation used in every single Neural Network Toolbox user guide and in the 'maglev' plant model look like this:
But lately, my friend told me that his example (also in Matlab) looked like this:
Moreover, the second equation is the result, other people got when building the equation from scratch.
That leaves me with a question. Which one is correct and why? It is very important thing to me, so if any of you could help me, please do.
Kind regards, Mat.

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采纳的回答

Greg Heath
Greg Heath 2014-1-20
If you Google
differential equations magnetic levitation
you will find the y^-2 form
Thank you for formally accepting my answer.
Greg

更多回答（2 个）

Mat
Mat 2014-1-20
I understanutd than, but so I don't have any doubts - is the mathematical equation presented in Matlab user's guide and in their examples incorrect?
David Sanchez
David Sanchez 2014-1-20
The force experienced by the ball under the influence of electromagnet is given by
F = mg - Kf (i/y)^2
where i is the current in electromagnet (Ampere), y is the distance of the ball from the electromagnet face
Then, the second equation presented by you is the correct one.

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