Thread: Mini-Review Dualsky XM5015TE-xx series
View Single Post
Old Oct 31, 2012, 07:55 AM
ViorelX is offline
Find More Posts by ViorelX
Registered User
Romania, BV, Brasov
Joined Apr 2010
18 Posts
Hi Louis,
You are not right.
Iron loss depends not only on rpm, but also on the flux density. Things are complicated, but a simple formula (Steinmetz) describes this loss as:
W=C * f^a * B^b,
Where f is the frequency of the rotational magnetic field (in the case of 24N28P it is 14x the rotational speed of the rotor), B is the flux density through the iron core and a, b are exponents close to 1 and 2 respectively.

Your tests measure iron loss only on no load run, with very low current and flux density. As the load increases, the flux density increases too, as well as the iron loss.
ViorelX is offline Find More Posts by ViorelX
Reply With Quote