G'day, I'm wondering a bit about some different types of motors and generators, most DC motors I've seen have had a permanent magnet for the armature, and an electromagnet for the stator, is this the case in ALL? What about generators? can they have a permanent magnet used in the stator also? I know if I spin a DC motor, it will generate a current, but I suspect it's not an efficient generator. What's the actual difference between a motor and a generator? Why is a generator efficient as a generator, but not a motor? Also can an ALTERNATOR be turned into an electric motor? Some videos would be good.
Cheers, Gab
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