being Commercially sold?
There isn't. That's why they aren't being sold.
It's the same reason you can't 'buy a pill that turns you into a god.
Every "perpetual" machine that has been produced has always relied on gravity or other forces to work. A true perpetual machine would work under ALL circumstances without help.
But even though some "perpetual" machines can work for some time, they wear out.
The main bugbear in any case should someone come up with a truly perpetual machine that didn't wear out, is that in order to be of any use it would need to generate not just enough power to keep itself running, but enough above that, so it can be made to do useful work on something else. In other words, it would need to be over 100% efficient. Impossible.
the closest ive seen was back in the '70s i saw a patent on a thing called a freon wheel . ever see those novelty " perpetual motion birds " that keep going back and forth like a seesaw , dipping it's beak in a glass of water ? the water evaporating from the fuzzy beak cools the alcohol fluid inside the hollow " bird " and shifts the weight back and forth until the water runs out .
well some guy uses a similar principle with a closed system ferris wheel size thing filled with freon . it starts to turn ( like a water wheel ) with as little as 2 degrees difference in temperature from the top to bottom . it turns slowly but has tremendous torque . if you were to set up a few hundred in the waste heat water from every power plant in america you could quintuple the electric output almost for free . obviously the fossil fuel industry bought the patent years ago and locked it in a vault .
i tried to look it up the patent recently and could no longer find it . hmmm .
Perpetual motion violates physical law. Energy is always lost in any machine and must always be replaced for continuation of a cycle. One can recycle some of the energy (giving the machine more than one cycle) but it cannot recycle it all. There's no free ride.
Current in a superconducting ring might be perpetual motion. Superconductors are conductors that have zero resistance. They all need very low temperatures, down near absolute zero.
So if you induce a current in them, the current keeps on flowing for ever. They have been used for computer memory.
They DON'T exist and CAN'T exist - ever. They violate the Laws of Thermodynamics.
Wikipedia explains if better than I can:
http://en.wikipedia.org/wiki/Perpetual_m...
No, all real systems have losses.
Is there such thing as a Perpetual Motion Machine? If there is how come it's not
being Commercially sold?