I am quite curious why are wind power direct-drive generators so heavy? A 10 kw one can weight up to 100kg.
Is it because they have to be wound for extremely low kv?
But permanent magnet ones are essentially bldcs (for instance, ebike hub motors).
The rpm difference there is just x3. Yet they are ~20 times heavier.
Thanks! And sorry if this is a stupid question, I just couldn't find any explanation.
Solar, wind, hydro and other non-fossil sources of electricity.
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