Development of Durability Test Device for Magnetorheological Fluids with Two Types of Rotors and Their Long-Term Torque Characteristics

Magnetorheological fluids (MRFs) are composites of micron-sized and/or nano-sized Fe particles and nonmagnetic oils, their rheological properties change with changes in the magnetic field. To distinguish between material mechanical deterioration, we developed a durability test system without influence sealing bearing on MRFs. We used set rotors stators to create V-shaped MRF layer. However, device produces constant field permanent magnet instead an electromagnetic coil make compact design cannot be tested under various dynamic inputs. Therefore, electric variable input two sets rotors, compared results tests. From findings, measured torque for parallel plate case was lower than predicted value. In contrast, disk exhibits higher estimated values. Durability tests types MRFs were conducted. The variation nano is significantly smaller both plates. addition, duration much shorter that plate.