Abstract
This paper has two main goals in the development of a novel flow-mode magnetorheological brake (MRB): (1) produce a mathematical model of a flow-mode MRB and (2) predict the torque density of the proposed MRB compared to the other type of MRB. In this design, the flow mode MRB is made by screw pump to make the Magnetorheological Fluid (MRF) flow through the radial and annular channel. The serpentine path flux is developed in the proposed MRB to make the annular channel an active region as well. With the proposed design concept, the work of a pure flow-mode serpentine path MRB can be accomplished. In this study, Finite Element Method Magnetics (FEMM) is used to calculate the magnetic field applied to the active regions and analytical approach used to obtain the output damping torque. The simulation results show that the magnetic fluxes flow through the radial channel and annular channel as well. The radial and annular channel is activated, which led to higher output damping torque. The mathematical modelling shows that the helical angle of the screw pump significantly affects the damping torque. The results show that the output damping torque density can be adjusted from 42.18 N/mm2 in the off-state with 0 rpm to around 40,518.96 N/mm2 at 20 rpm. The torque density of the proposed MRB is higher than the shear mode MRB.
Highlights
Magneto-rheological (MR) materials are classified as smart materials because they can change their properties when subjected to a magnetic field [1]
Based on the proposed rotary MR damper proposed by Gurocak et al [26] and Yu et al [21], this paper introduces a flow-mode serpentine path rotary
The results of Finite Element Method Magnetics (FEMM) simulation indicate that the configuration of the magnetic conductive material and non-magnetic conductive material of the proposed rotary MR damper could bend the magnetic flux into a serpentine path configuration
Summary
Magneto-rheological (MR) materials are classified as smart materials because they can change their properties when subjected to a magnetic field [1]. MR materials comprise magnetic particles and its matrics. MR Elastomer and MR Fluid (MRF) are examples of MR materials. MR Elastomer consists of a magnetic particle and an elastomer such as waste tyre rubber [2] and natural rubber [3] as the matrics. MRF has magnetic particles with liquid-phase matrics [4]. MRF can change its form from liquid to gel and its properties when a magnetic field is applied to it [5]. Its viscosity doubles when subjected to a magnetic field, due to the increase in yield shear stress [6]. MRF has received much attention during the two past decades, as it has huge potential for daily needs application
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