No, a perpetual motion machine is one that uses no net energy to produce energy. Fusion would indeed tap into a powerful energy source, but it, well, USES it. Each bit of energy that it provides is then gone from the atoms that were involved, so you continually need more material. Since the energy yield is large, we may not notice this 'loss', but it is certainly there. And if there is a loss, you cannot consider it to be perpetual motion.
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I don't know if it's entirely impossible (unlike a perpetual motion machine which is) but it is definitely beyond our abilities to produce it right now. Think of how much energy it takes to fuse two atoms. The only reason stars can do it is because of their intense gravity, pressure, and heat.
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its believed that nicola tesla had a machine possible of cold fusion