多圆弧式磁流变液传动性能研究

Study on the Performance of Multi-circular Magnetorheological Fluid Transmission

针对磁流变液传动装置传动转矩小的缺点,提出一种多圆弧式磁流变液传动结构。通过有限元法对传动装置磁场进行分析,得到圆弧半径和励磁线圈电流对传动装置磁场强度影响;通过对比多圆弧式和圆筒式工作间隙的磁场强度,得出传动装置磁场强度与轴向距离的关系;建立多圆弧式磁流变液传动转矩与圆弧半径、剪切屈服应力、角速度等的数学关系。结果表明:圆弧半径对传动装置磁场强度影响显著,圆弧半径越大,磁场强度分布越不均匀;传动装置转矩随着励磁线圈电流的增大而增大;电流I=3 A时,多圆弧式磁流变液传动输出转矩为52.47 N·m,圆筒式为37.76 N·m,前者较后者提高了38.96%,提升效果显著。

In view of the shortcomings of the small transmission torque of the magnetorheological fluid transmission device,a multi-circular magnetorheological fluid transmission structure was proposed.The magnetic field of the transmission device was analyzed by the finite element method,and the influence of the arc radius and the excitation coil current on the magnetic field strength of the transmission device was obtained.The magnetic field strengths of the multi-circular and the cylindrical working gap were compared,and the relationship between the magnetic field strength of the transmission device and the axial distance was obtained.The relationship between the transmission torque of the multi-circular magnetorheological fluid and the arc radius,the shear yield stress and the angular velocity was established.The results show that the arc radius has a significant effect on the magnetic field strength of the transmission,and the larger the arc radius is,the more uneven the distribution of the magnetic field strength is;the torque of the transmission increases with the increase of the excitation coil current;when the current I is 3 A,the output torque of the multi-circular magnetorheological fluid transmission is 52.47 N·m,and the output torque of the cylindrical type is 37.76 N·m,the former is 38.96%higher than the latter,and the improvement effect is significant.