Why we can’t attach some magnets onto a turbine and set them up to repel each other, causing the turbine to spin and producing energy.
Is it just not efficient? Or is there something else at play that would prevent this from working?
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If a magnet repels something that object moves further away, which releases energy. The problem is to do that again you need to get it closed again, that requires energy.
So if you have a magnet on the rotating rotor and another on the stationary stator the energy you get from them replacing each other is equal to the energy required to get back to the original position.
You might think that you can turn the magnet on the rotor so that it is attracted to the stator magnet when it moves towards it and then turn around and it repels. The problem is turning it in the magnetic field requires a force and the work to do that is the same as the energy you get out of the repulsion.
Electromagnets that can be turned on and off does not help, the energy you can get out in put in there by the electricity.
So there is not free energy. Ideally you get back what you put in, in practice there is friction and energy losses in other way so you get less out then you put in.
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