[Non-magnetic zone]

Non-magnetic zone

If you place a suspended (overband) magnet, keep the following in mind.

When positioning the magnet, the construction below the magnet such as the frame, bearing rollers and reversing rollers must be made of non-magnetic material. This is because steel parts will become magnetized, which will adversely affect the separation performance of the overband magnet.

Goudsmit uses the following rule of thumb:

Keep the area extending a distance of 1/2 of the magnet’s width (shown below as 'W' or ‘L’) on all sides free of magnetic material. For the area below the magnet, maintain a non-magnetic zone of 2/3W or 2/3L. It is important to make all components in this zone out of stainless steel, plastic or other non-magnetic material.

View Goudsmit's ferrite, neodymium or electromagnetic overbands here.