What is the direction of the magnet flux lines?
The solid cast Alnico 5 magnet is limited to a maximum shaft diameter of 5 inches. This magnet is magnetized through the diameter so that the flux lines extend outward from the magnet’s outside diameter. The magnetic circuit is completed through the outside diameter of the seal case. Seals for shaft diameters larger than 5 inches use a 440C stainless steel mating ring that has Alnico 5 bar magnets inserted into the face of the ring. These magnet inserts are magnetized through their length so that the flux extends axially. Again the magnetic circuit is completed through the seal case.
