Chattering due to vibrations on the machine tool shaft and control of the transmitted torque are both a concern in precision machining. Hence, a magnetorheological fluid clutch–brake, also acting as a rotary damper could be a promising solution. Permanent magnets are used to mechanically activate the clutch thus offering simplicity and reliability in operation. The viscosity of the magnetorheological fluid changes with the action of the magnetic field thus allowing to tune the transmitted torque. Moreover, the fluid adds damping in the system. In this paper, a computational magnetohydrodynamics model has been realized in order to numerically investigate and visualize the torque transmission under different rotational velocities when submitted to magnetic flux. The model was validated with experimental data from the literature. Results showed that because the permanent magnets have a limited flux intensity, the torque transmission is only efficient at lower rotational velocities.

由于机床轴上的振动而产生的颤动和传递扭矩的控制都是精密加工中需要考虑的问题。因此，磁流变液离合器制动器也可以用作旋转阻尼器可能是一个有前途的解决方案。永磁体用于机械地激活离合器，从而提供操作的简单性和可靠性。磁流变流体的粘度随磁场的作用而变化，因此可以调节传递的扭矩。此外，流体会增加系统的阻尼。本文建立了一个计算磁流体动力学模型，以便数值研究和可视化在经受磁通量的情况下在不同旋转速度下的扭矩传递。使用来自文献的实验数据验证了该模型。