双线圈旁置式新型磁流变制动器的设计与优化

为提高传统单线圈混合式磁流变制动器的制动力矩,提出了一种双线圈旁置式新型磁流变制动器.利用一种新的线圈安装方式,增大了制动盘圆柱面的可控作用面积,从而增大了磁流变制动器的制动力矩.基于Herscher-Bulkley模型,提出了双线圈旁置式磁流变制动器的力矩模型与磁路设计方法,并在特定条件下对其进行了多目标优化.研究结果表明:与单线圈混合式相比,在相同体积条件下,双线圈旁置式能产生更大的制动力矩;而为了充分利用磁流变液的流变性能,获得更紧凑的结构,双线圈旁置式磁流变制动器的宽度应在80~100mm之间,长宽比的合理范围应在0.6~1.2之间;优化后在制动器质量基本维持不变的情况下,制动力矩提高了11%.研究结果可作为磁流变制动器的设计参考.

Design and optimization of a novel magnetorheological brake with double coils placed on the side housing

In order to improve the braking torque of conventional hybrid magnetorheological brake (MRB)with single coil,a novel MRB with double coils placed on the side housing is proposed. The novel structure enabled it to have larger area of controllable interaction face in cylindrical surface of brake disk and a larger braking torque.The torque model and design method of mag-netic circuit of the novel MRB were proposed based on Herscher-Bulkley model.And then a multi-obj ective optimization under the specific condition was conducted.Comparative analysis be-tween conventional and novel MRB demonstrated that under the condition of the same volume, the novel MRB had a larger braking torque.And in order to make full advantage of the rheologi-cal properties of MRF and get a more compact structure,the width of the brake should be 80-100 mm and the reasonable range of the length-width ratio should be 0.6-1.2.After optimization,the braking torque was increased by 1 1% in the situation which its weight basically remained un-changed.The results can be taken as reference to the design of MRB.