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I'm sorry but that's hilarious question. I think you should know something about your next school. I pretty sure that they have at least some webpages. Look at them and read something about the school. Of course you can expect lots of mathematics, physics, mechanics, computer engineering, etc.

Thank you, could you please post the source?

Thank you for your answer. It helps me.

I already know how to do it. Please do not post messages about how to build such a platform or how to place the magnets to the wheels etc. I asked for the magnetic force that reacts against the movement. This force is acting like a rolling resistance and I don´t know how to count it. I can promise you that no life will depends on it.

Hi Enthalpy, I'm sorry but I didn't express myself clearly. The wheels will attract the platform to the metal surface. There is nothing like a levitation and no space between wheels and surface. This force react againts the move in both direction up and down like a rolling resistance. Maybe if I increase the friction coeficient, maybe that is the solution. Am I right?

Hi, I need an advice with magnetic wheels. I'm very new to this discipline and a I don't know where to ask else. So, I have four magnetic wheels on moving platform. This platform will move in vertical direction. The surface will be metal and that's reason why I have magnetic wheels. When I want to move with the platform up I have to get over a gravity force and magnetic force that produce my wheels. I don't know how to count these magnetic force. It shouldn't have to be precisely calculation, because I will add some overdesign. It's enought to calculate it approximately. Could you please tell me how to do it or where to start (some webpages, books, etc.)? If I didn't it explain clearly or if you have any question I would be very glad to answer and solve the problem. Thanks in advance.