×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Sync/Async generator efficiency

Sync/Async generator efficiency

Sync/Async generator efficiency

(OP)
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.

RE: Sync/Async generator efficiency

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

RE: Sync/Async generator efficiency

(OP)
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)

RE: Sync/Async generator efficiency

(OP)
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)

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources