Design and optimization of magnetorheological damper for rotor with rectangular concave structure

Aiming at the problem of low torque density of traditional disk magneto-rheological damper ( MRD),a concave structure was proposed to increase the effective working gap length, keep the structure size compact and improve the output torque density. The torque models of traditional disc,rectangular concave structure,and arc concave structure were established respectively. Through the key size design and quantitative comparison analysis, it is shown that the rectangular concave structure has better effect on improving the torque density under the same conditions. In order to make full use of the torque gain effect of rectangular concave structure, the influence of key parameters such as rectangular groove position, groove width and groove depth on torque density and torque fluctuation was quantitatively analyzed, and the reasonable optimization interval of key parameters was obtained. Under the premise of satisfying the target design torque, coil power and the determined range of parameters, taking the minimum volume as the objective function, the structural parameters of magnetorheological damper including rectangular grooves were optimized. The results show that the torque density of the optimized device increases by 23. 39%,which provides guidance for the actual design of the rectangular groove rotor damper. © 2023 Chinese Vibration Engineering Society. All rights reserved.