Environmental Engineering Reference
In-Depth Information
1
1
B
1
i
B
2
i
0.95
0.9
0.933998
4
10
4
3.175
10
4
2
10
4
2
10
4
4
10
4
0
x
i
3ยท175
10
4
(a)
1
1
B
3
i
0.5
B
5
i
0.065329
0
4
10
4
2
10
4
1
10
4
3
10
4
0
10
4
10
4
10
4
10
4
3
1
2
4
x
i
3.175
10
4
3.175
10
4
(b)
Figure 8.3 Effect of skin depth on flux penetration into 0.635 mm lamination:
(a) B1 is the case of 24 gauge steel with
m
r
= 500 at 60 Hz and B2 is
for 400 Hz base frequency; (b) B3 is at 2 kHz and B5 is at 10 kHz
switching frequency, 24 gauge lamination
1
1
B
1
i
0.9995
B
2
i
0.999282
0.999
1
10
4
1
10
4
5
10
4
5
10
4
1
10
4
0
x
i
1
10
4
Figure 8.4 Effect of skin depth on flux penetration into 0.2 mm lamination
holds this flux to within 1% of its surface value. Of course, the values for switching
frequency are much lower as can be seen from Figure 8.3(b) where the 5 kHz flux is
virtually non-existent at the centre of the lamination (
x
=0).
