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EM Shield Calculator
Industrial/Aerospace/Military Specifications
Designs by the inventor of the Slotless Wide Airgap Motor
Concentric Cylindrical Magnetic Shields
The conventional shield formulas published by several shield manufacturers are incorrect producing significant errors.
This calculator uses corrected formulas which are proprietary and are not in the public domain.
with One Cylinder    
Ds shield inside diameter
cm
Ls shield length
cm
t1 shield thickness
cm
µr1 initial permeability of shield
 
 
r1 inside radius of equivalent sphere
cm
Ro1 radius of equivalent sphere
cm
Ro1/r1  
 
R1 shield outside radius
cm
Bo/Bs  
 
interior attenuation with first magnetic shield
db
with Two Cylinders    
s2 space between shields 1 and 2
cm
t2 shield thickness
cm
µr2 initial permeability of shield
 
 
Ro2 radius of equivalent sphere
cm
Ro2/r1  
 
R2 shield outside radius
cm
Bo/Bs  
 
interior attenuation with second magnetic shield
db
with Three Cylinders    
s3 space between shields 2 and 3
cm
t3 shield thickness
cm
µr3 initial permeability of shield
 
 
Ro3 radius of equivalent sphere
cm
Ro3/r1  
 
R3 shield outside radius
cm
Bo/Bs  
 
interior attenuation with third magnetic shield
db
 
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