| MAGNET
FORMULAS |
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| A
small web site devoted to the vanishing art of practical
magnet design without FEA (Finite Element Analysis). |
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| The Basics |
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Maxwell
and His Equations |
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The Law of Biot Savart |
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Mysterious Units of Magnetics
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| Simple Magnetic Field Formulas
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Field due to electric current in an
infinitely long, straight wire |
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Field inside an infinitely long, straight,
air core solenoid |
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Field inside an air core toroid |
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Field
due to a current loop |
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On-axis
fields due to round, finite, air core solenoid shells |
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On-axis
fields due to round, finite, air core solenoids |
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Off-axis
field due to a current loop |
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Off-axis
fields due to a magnetic dipole moment |
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Off-axis
fields due to round, finite, air core solenoids |
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| Helmholtz Coils for High Field Uniformity
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On-axis
field due to two coaxial current loops with Helmholtz
spacing |
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On-axis
field due to two round, coaxial, finite solenoids with
arbitrary or Helmholtz spacing |
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Off-axis fields due to two or more round,
coaxial, finite solenoids with arbitrary spacing
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| Design Considerations |
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Scaling rules |
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Coil cooling techniques and other rules of
thumb |
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Magnet Formulas web site, © 2005 by
Eric Dennison.
I am developing an updated and expanded
version of the magnet web site and encourage you to
visit this work in progress
and comment on what you see. As a self-employed software engineer
trying to balance time between work and magnets, your encouragement
in building this site is always welcome!
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Please consider clicking the PayPal link and making a contribution
to support the maintenance and development of this site. Thank you
for visiting!
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