A 4-79 permalloy solenoid coil needs to produce a minimum inductance of 1.5 Wb/m^2. If the maximum allowed current is 8mA, how many turns are required in a wire 132cm long?
A 4-79 permalloy solenoid coil needs to produce a minimum inductance of 1.5 Wb/m^2. If the maximum allowed current is 8mA, how many turns are required in a wire 132cm long?
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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A 4-79 permalloy solenoid coil needs to produce a minimum inductance of 1.5 Wb/m^2. If the maximum allowed current is 8mA, how many turns are required in a wire 132cm long?
Transcribed Image Text:Table 20-4 Properties of selected soft magnetic materials
Permeability u,
Initial Maximum He(A - m-1)
Coercivity Retentivity Bmax Resistivity
B, (T)
( μΩ. m )
Name
Composition
(T)
Ingot iron
99.8% Fe
150
5000
80
0.77
2.14
0.10
Low-carbon steel 99.5% Fe
200
4000
100
2.14
1.12
Silicon iron,
unoriented
Fe-3% Si
270
8000
60
2.01
0.47
Silicon iron,
grain-oriented
Fe-3% Si
1400
50,000
7
1.20
2.01
0.50
4750 alloy
Fe-48% Ni
11,000
80,000
2
1.55
0.48
4-79 permalloy
Fe-4% Mo-79% Ni 40,000
200,000
1
0.80
0.58
Superalloy
Fe-5% Mo-80% Ni 80,000
450,000
0.4
0.78
0.65
2V-Permendur
Fe-2% V-49% Co
800
450,000
0.4
0.78
0.65
Supermendur
Fe-2% V-49% Co
100,000
16
2.00
2.30
0.40
Metglas 2650SC
Feg1B13.5Sİ3 5C2
300,000
3
1.46
1.61
1.35
Metglasa 2650S-2 Be78B13S9
600,000
2
1.35
1.56
1.37
MnZn ferrite
MnZn ferrite
NiZn ferrite
H5C2b
10,000
7
0.09
0.40
1.5 x 105
H5EB
18,000
3
0.12
0.44
5 x 104
K5b
290
80
0.25
0.33
2 x 1012
aAllied Corporation trademark.
BTDK ferrite code.
(Based on "Magnetic Materials: An Overview, Basic Concepts, Magnetic Measurements, Magnetostrictive Materials," by G. Y. Chin
et al. In R. Bloor, M. Flemings, and S. Mahajan (eds.), Encyclopedia of Advanced Materials, Vol. 1, Peragamon Press, 1994.)
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