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Originally posted by boncho
Magnets eventually lose their charge without something to replenish them.
/thread
A permanent magnet will retain its magnetism unless it is affected by a strong outside magnetic or electrical force, or elevated temperatures. If they are not exposed to any of these conditions, permanent magnets will lose magnetism on their own, however this degradation is very slow, on the order of one percentage point every ten years or so.
Originally posted by dashen
reply to post by boncho
The sun runs out of hydrogen to burn it dies.
/solar system
Originally posted by dashen
reply to post by boncho
Neither is the machine in the featured video, but the 1000 or so years it would take the magnet to lose its charge puts your initial comment in perspective.
A permanent magnet synchronous generator is a generator where the excitation field is provided by a permanent magnet instead of a coil.
Synchronous generators are the majority source of commercial electrical energy. They are commonly used to convert the mechanical power output of steam turbines, gas turbines, reciprocating engines, hydro turbines and wind turbines into electrical power for the grid. They are known as synchronous generators because the speed of the rotor must always match the supply frequency.
Originally posted by N3k9Ni
Would it be enough to overcome the magnetic resistance needed to turn a generator?
Originally posted by boncho
Permanent magnets are used all over the place, like in alternators and wind turbines, but they are not a source of power...
Originally posted by inverslyproportional
reply to post by OccamsRazor04
In the second segment of the video though he has a cam on the flywheel which raises the magnet itself, we did somthing like this in science class in high school, the problem was alway, torque, it never had enough to do anything useful, it basically only ever mover air, and not much of that.
I wander if it was larger scale in a vacuum, with a heavier flywheel, if we could have done more, we never had the budget to test it though, I am saving if for my 12 year olds science fair experiment.
Also magnatism proves propetual motion, as does gravity, it is true, we just lack anything close to the scientific understanding to pull it off.
One day we will, IMHO have proof of concept, on a real life perpetual motion machine, sadly I will probably be dead before that happens though.