Effect of Air Gap on Holding Force

An assembly consisting of some or all of the following: permanent magnets, ferromagnetic conduction elements, air gaps, electrical currents.

The below chart explains the effect of air gaps on holding force for Pot magnets.

Flux Lines Movement

Magnetic assemblies usually consist of permanent magnets and ferromagnetic conduction parts.

As the magnetic flux in ferromagnetic conduction parts(eg: iron) can be directed around corners and be concentrated, the magnetic properties of the assemblies could be considerably improved. Also, ferromagnetic conduction materials are much more easier to process(compared with magnets), then the cost of magnetic assemblies could be lower.

The below drawings indicate the movement of flux lines inside magnets and some magnetic assemblies by using magnetic flux.

1. Magnets

2. Magnet with steel plate

3. Magnet ring with“T”shaped steel plate

Shallow pot with disc magnet

4. Shallow pot with ring magnet

5. Pot magnets

6. Sandwich structure

7. Multipole sandwich structure