Right-computer fans and server blowers are ECM's (Electronically Commutated Motors), also known as brushless or BLDC (BrushLess DC). Since they need a power supply to run on mains current, I mentioned them for 12vdc, but they are different names for the same thing.
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"I‘d put my money on the sun and solar energy. What a source of power! I hope we don‘t have to
wait until oil and coal run out before we tackle that." Thomas Edison, 1847 — 1931
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