One of the first true revolutions that took us from the traditional agricultural society was the motor - first steam, then oil or electricity. Having a power source in agriculture other than horse or man was huge. A farmer was often worn out before the age of 50 mainly because of hard bodily labor. A 100w electric motor is doing the work of a hardworking man.
Later years we have seen the coming of the PM electric motor (Permanent neodymium magnets). The introduction of the neodymium magnets was a revolution in terms of efficiency and reliability. Its a simpler motor in construction with no slip-rings. It will run till the roller bearings is worn out - truly a amazing machine. The only problem with the PM motor is the need for a ESC (Electronic Speed Controller). The ESC is a pretty complicated piece of electronics, but in the overall picture I state that this trade-off is worth it. More about the ESC below. And btw. A PM motor IS a PMG (permanent magnet generator or PM alternator for in-lighted. More about the PMG later.
Link to some very simple high performing DIY PM motors here.
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