Sync/Async generator efficiency 1

[laranjatomate]

Good morning everybody.
I am responsible for evaluating heat loads inside the nacelle of a small wind turbine (100kW).
That´s difficult to find catalogs which describe the mechanical efficiency for generators. These data are almostly available just for motors, either synchronous and asynchronous. And I know it is a wrong thing to use the same efficiency coefficients for motors.
I don´t need very refinated estimatives, rough ones are enoough for our conservative calculations.
Does somebody have information about mechanical-electrical conversion efficiency in this range?
Thanks for attention.

 

[waross]

Use motor efficiencies. Most of the heat developing sources are the same. windage, winding losses I²R, hysteresis, etc.
Any difference will be much less difference than day and night or a small breeze.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[laranjatomate]

Right.
That rough efficiency estimate is enough for my thermal load calculations. I have found few efficiency data and now I can deal with both generator and motor efficiency.
Thanks.

Dad, are there cakes, pies and panettones in Brazil?
Pay attention, son: if there are not such things, we will make them ourselves.
(Carlo Bauducco, about to emmigrate from Italy)

 

[laranjatomate]

Thinking better, I have found efficiencies in the 94-95% range for high efficiency asynchronous motors, while the async generators have shown up to 92% in the few catalogs I have found.
That means some kW of difference.
I found a catalog of Metalcorte (former Eberle) with open circuit and blocked rotor tests. I think I can reach async generator efficiencies from that.

But, thanks even so.

Dad, are there cakes, pies and panettones in Brazil?
Pay attention, son: if there are not such things, we will make them ourselves.
(Carlo Bauducco, about to emmigrate from Italy)