Application and Torque Stability of the MR Transmission Technology: A Review

Magnetorheological (MR) transmission device (MRTD) is an intelligent semi-active mechanical device using MR fluid as the working medium. In the presence of a magnetic field, the MR fluid can be rapidly and reversibly converted from a liquid state to a solid-like state so that the torque transmitted by the MRTD can be continuously controlled by changing the magnetic field strength. MR transmission technology relies on the MR effect exhibited by the MR fluid. It brings many attractive advantages including simple control, fast response, low energy consumption, and excellent stability, which can meet the operating requirements of the complex electromechanical system. In addition, MR transmission technology is advancing towards the direction of high-power, high-torque, and high-slip, providing an ideal resolution to the problems of noise, vibration, friction and wear, complex structure and high cost of continuous control. In this review, the fundamental principle of MR transmission technology is described. Thereafter, a comprehensive review of the research status and the latest progress of the MRTD has been presented. This review also analyzes the stability of the MRTD and makes suggestions for future development.