Park Jin-Young, Oh Jong-Seok, Kim Young-Choon
Department of Mechanical Engineering, Kongju National University, Cheonan 31080, Korea.
Department of Future Automotive Engineering, Kongju National University, Cheonan 31080, Korea.
Sensors (Basel). 2022 Feb 23;22(5):1757. doi: 10.3390/s22051757.
A magnetorheological (MR) multi-plate clutch was proposed with both mechanical friction mode and magnetic field control modes. The magnetic field control mode was based on an MR fluid coupler that changed its viscous properties according to the density of an applied magnetic field. This mode was used in the early stage of clutch operation to reduce the impact of friction between the disc and plate, and eliminate to the extent possible the difference in their relative speeds when contacting each other in later stages. Once the rotational speed difference between the disc and plate was reduced, the clutch was operated in mechanical friction mode by compressing the friction surfaces together. A torque modeling equation was then derived for each mode based on the Bingham model of the MR fluid, and the transmission torque of the proposed multi-plate clutch was derived using these equations as well as magnetic field analysis results obtained using ANSYS Maxwell. A multi-plate MR clutch was then fabricated, and its torque transmission characteristics were evaluated in the magnetic field control and mechanical friction modes. The results confirmed that the model-based torque calculations were consistent with the observed transmission torque. Finally, control algorithms for mechanical friction only and mixed mechanical friction/magnetic field control torque tracking of the proposed MR multi-plate clutch were designed, and their performances were evaluated when applying unit step command, half-sine-wave command, and rotational speed changes. The results indicated that the torque tracking control was performed smoothly, demonstrating the advantages of the proposed clutch.
提出了一种具有机械摩擦模式和磁场控制模式的磁流变（MR）多片离合器。磁场控制模式基于磁流变液耦合器，该耦合器根据施加磁场的强度改变其粘性特性。此模式用于离合器操作的早期阶段，以减少盘片之间摩擦的影响，并尽可能消除后期相互接触时它们相对速度的差异。一旦盘片之间的转速差减小，离合器通过将摩擦表面压缩在一起以机械摩擦模式运行。然后基于磁流变液的宾汉模型为每种模式推导了扭矩建模方程，并使用这些方程以及通过ANSYS Maxwell获得的磁场分析结果推导了所提出的多片离合器的传递扭矩。随后制造了一个多片磁流变离合器，并在磁场控制和机械摩擦模式下评估了其扭矩传递特性。结果证实基于模型的扭矩计算与观察到的传递扭矩一致。最后，设计了所提出的磁流变多片离合器仅机械摩擦和机械摩擦/磁场混合控制扭矩跟踪的控制算法，并在应用单位阶跃指令、半正弦波指令和转速变化时评估了它们的性能。结果表明扭矩跟踪控制平稳执行，证明了所提出离合器的优势。
