Weight of wind power generators

Noob0123

1 µW
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Oct 12, 2020
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Hi.
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.
 
Because they are designed for decades of continuous service

and stationary, no need for light weight as in mobile applications.

They do make light ones for recreational sailboats.
 
Noob0123 said:
Hi.
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.

I have actually looked for the answer in quantum world.

As the HAWT generator is attached to system that is perpendicular to earth gravity field...it gets very stressed.

VAWTs don't have this issue.
 
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