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Power Electronics and Motor Drives
book

Power Electronics and Motor Drives

by Bogdan M. Wilamowski, J. David Irwin
October 2018
Intermediate to advanced content levelIntermediate to advanced
1015 pages
40h 24m
English
CRC Press
Content preview from Power Electronics and Motor Drives
6-6 Power Electronics and Motor Drives
6.2.1 Magnetic Device with PM
Figure 6.8a shows a magnetic device including an iron core, a PM, and an air gap. e Ampere law
around the dashed line is
H t H g
m m g
+ = 0
(6.2)
where
H
m
and H
g
are the magnetic eld strengths of the PM and air gap, respectively
t
m
and g are the PM and the air gap thickness, respectively
TABLE 6.1 Main Properties of Hard Magnetic Material
B
rem
(T) H
c
(kA/m) Curie T (°C)
Operating
T
max
(°C)
Density
(kg/m
3
) {B
m
H
m
}
max
(kJ/m
3
)
Ferrite 0.38 250 450 300 4800
30
A
lnico 1.20
50 860 540 7300 45
S
mCo 0.85 570 775 250 8300 140
NdFeB 1.15 880 310 180 7450 260
1.4
1.2
1.0
0.8
0.6
0.4
H
m
field strength ...
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Publisher Resources

ISBN: 9781439802861