Rotational Losses of Asynchronous Machines
Rotational Losses of Asynchronous Machines
(OP)
As known; rotational losses in an asynchronous machine includes;
* Core Losses
* Friction & Windage Losses
* Stray Losses (Miscellaneous Loses)
For an asynchronous MW size generator; are all the rotational losses constant for all operating conditions? In other words; can we say " Rotational losses of an asynchronous machine are constant at rated load and 20% load"?
Or must we say " Rotational losses should vary as a percent ratio of the input power"?
Thank you.
* Core Losses
* Friction & Windage Losses
* Stray Losses (Miscellaneous Loses)
For an asynchronous MW size generator; are all the rotational losses constant for all operating conditions? In other words; can we say " Rotational losses of an asynchronous machine are constant at rated load and 20% load"?
Or must we say " Rotational losses should vary as a percent ratio of the input power"?
Thank you.





RE: Rotational Losses of Asynchronous Machines
RE: Rotational Losses of Asynchronous Machines
The "stray-load loss" is that portion of total loss not accounted for by the other losses: rotor I^2R, stator I^2R, core, friction/windage. (Ref IEEE112-1996 paragraph 5.4).
The stray-load loss varies in proportion to load-squared (Ref IEEE739-1995 paragraph 3.7.4).
RE: Rotational Losses of Asynchronous Machines
RE: Rotational Losses of Asynchronous Machines