Investigation of physical properties of magnetic liquids in alternating and constant magnetic fields

The physical properties of magnetic fluids (hereinafter - MF) of three types are investigated: on the basis of mineral oil; silicone (silicone) liquid PES-5 and organic-fluorine compounds. The influence of the change in the MF physical properties at the moment of friction in the "shaft-bushing" coupling is determined, depending on the magnetic field induction (alternating magnetic field) and the shaft rotation frequency. The values of the breakdown pressure of magnetic fluids in the gap "shaft-pole tip" are determined at a constant magnetic field (permanent magnet), depending on the shaft rotation frequency as well as the time factor. To assess the MF stability, a stability factor that is capable of taking into account the structural changes in MF over time has been proposed. (paper)