December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
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44 Introduction to Electrical Power and Power Electronics
Regarding the magnetic loss, the alternating magnetic ux produces two types
of power loss in the ferromagnetic iron core: (1) hysteresis loss
PKfB
n
hys
th
m
=
due
to hysteresis (magnetic friction) and (2) eddy current loss
PKfBt
eddy
em
=
222
due to
internally circulating (eddy) currents in the core body. Here, K
e
and K
h
= propor-
tionality constants, f = frequency, B
m
= maximum (peak) ux density, t = thickness
of the core laminations perpendicular to the ux ow, and n = Steinmetz constant
(typically 1.6 to 1.8 for magnetic steel used in electrical machines).
Since P
eddy
depends on the core lam ...
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