Magnetorheological (MR) fluid brake is a device to transmit torque by the shear force of MR fluid.A MR rotary brake has the property that its braking torque changes quickly in response to an external magneticfield strength. In this paper, the design method of the cylindrical MR fluid brake is investigated theoretically.The equation of the torque transmitted by the MR fluid within the brake is derived to provide the theoreticalfoundations in the cylindrical design of the brake. Based on this equation, be mathematically manipulated, thecalculations of the volume, thickness and width of the annular MR fluid within the cylindrical MR fluids brakeare yield.
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