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Formulas for Magnetic Circuits |
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Impedance
(In general)
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(For an
inductor) |
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Core Constant
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Zs
= Source impedance
ZL
= Load impedance
ZSD =
Shielding device impedance |
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Solenoid (Sl)
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Toroid
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Magnetic
Field Intensity
(Amperes/meter) |
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Magnetic
Flux Density
(Webers/meter2) |
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Inductance
(Henries) |
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Where
µ =
µrµo
µr =
relative permeability of the core
µo =
permeability of free space =4∏ x
10-7 Farads/m2
r = mean core
radius
I = current
in amperes
N = number of turns
∏ = 3.141592...
ℓ =
magnetic path length |
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Identities
1 Tesla (T)
= 1 Weber/meter2= 1 x 104Gauss
1 milliTesla (mT) = 1 X 10-3Tesla
=10 Gauss
1 Gauss (G)
= 1 x 10-4Tesla = 0.1 milliTesla |
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