There are many seals designed for rolling bearings. One interesting perspective is the application of magnetic
fluid seals for this purpose, because they are an alternative to commonly-used solutions and combine the advantages
of contactless seals (e.g. labyrinths) and contact seals (e.g. rubber lip seals), therefore they have low resistance
moment and high tightness. This publication describes rolling bearings and a magnetic fluid seal system
in terms of the maximum sealing pressure, which was compared to the results of numerical simulations, and
the influence of the magnetic field on the bearing torque was also investigated. The tests were carried out for
various types of seal stage shapes. Different magnetic circuit configurations have been considered i.e. the main
magnetic flux passing through the seals or rolling bearings (steel or ceramic). Studies have shown that a magnetic
field increases the torque in the bearing and magnetic fluid seals may reduce the torque because part of
the magnetic flux passes through the seal elements. This result is important because it shows that it's possible to
reduce the negative effects of variable magnetic fields on rolling bearings by using additional elements of the
magnetic circuit.