Jump to content

User:Msiddalingaiah/Magnetics

From Wikipedia, the free encyclopedia

Alex Slocum of MIT has some great design tool spreadsheets.

Basics

[edit]
  • Energy in a magnetic field, Ramo et. al.:

  • For linear materials, where

  • Force is

  • Force per unit area (pressure) is

  • In the case of free space (air), :

@ B = 1 Tesla

@ B = 2 Tesla

  • In a closed magnetic circuit:

  • Subsituting above,

To build a strong electromagnet, a short geometry, with large area is preferred. Note that most Ferromagnetic materials saturate around 1-2 Tesla. This occurs at a field intensity of:

For this reason, there is no point in building an electromagnet with a higher field intensity.