Is the Matlab magnetic levitation model example correct?
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Mat
le 20 Jan 2014
Réponse apportée : David Sanchez
le 20 Jan 2014
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:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/155302/image.jpeg)
But lately, my friend told me that his example (also in Matlab) looked like this:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/155303/image.jpeg)
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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Réponse acceptée
Greg Heath
le 20 Jan 2014
If you Google
differential equations magnetic levitation
you will find the y^-2 form
Thank you for formally accepting my answer.
Greg
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Plus de réponses (2)
David Sanchez
le 20 Jan 2014
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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