Page 84 - Electric Machinery Fundamentals
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6U ELECTRIC MACHINERY FUN DAMENTALS
1.25
1.00
E
'" 0.75 -I-
'" ."
..,
" "
x
G:
" 0.50
0.25
0.0
100 1000
Magnetizing intensity H (A • turns/m)
FIGUREPI-9
The magnetization curve for the core mutedal of Problems 1- 12 and 1- 14.
T
Scm
_I
1
'f-----lN = 400 turns 16 em
-!
Scm
-.-L
--
1--5 cmI-- 16 cm-I-s em--I-16 em--I-s em--I
Depth = S em
FIGURE PI-IO
The core of Problem 1-13.
Figure P l-9. Assume a 5 percent increase in effective air-gap area to account for
fringing. How much current is required to produce an air-gap flux density of 0.5 T?
What are the flux densities of the four sides of the core at that current? What is the
total flux present in the air gap?
