一种对接机构转子杯式电磁阻尼器设计研究

Research of an Eddy Current Damper Design for Docking Mechanism

为适应不同方向对接耗能量大幅增加的状况,对一种空间对接机构耗能用转子杯式电磁阻尼器的设计进行了研究。在一定的简化条件下,建立了转子杯式电磁阻尼器阻尼力矩特性的理论计算模型。阻尼器材料选用钕铁硼、不锈钢和硬铝。对阻力器阳极的力矩特性进行了理论计算并与仿真比较,两者相近,表明理论计算模型较准确地反映了阻尼器各设计参数对阻尼力矩特性的影响,但理论计算值仍与样机实测结果存在一定偏差。用多轮迭代修正方式,对转子杯的参数进行调整,并考虑了由此产生的气隙厚度对漏磁的影响,获得了修正的阻尼器阻尼力矩计算公式。结果表明:在转速0~500r/min范围内,阻尼力矩与转速实测值呈良好的线性关系,阻尼器产品实际测试结果与修正后的理论模型计算值基本一致。

An eddy current damper with high torque capacity has been developed as an energy absorption device for space docking mechanism to adapt energy absorption increasing greatly during docking in this paper.Theoretical model of torque-speed characteristic for eddy current damper was established with certain simplified conditions.NdFeB magnet,stainless steel and duralumin were selected as the materials of eddy current damper.The theoretical computation of the torque-speed characteristic for the damper was carried out and compared to the simulation value.It showed that the results of computation and simulation were similar,which meant the theory model characterized the influence of various parameters of the damper on the torque-speed characteristic correctly.But the computation results were still different from the test value of the prototype.The damper's parameters were adjusted through multiple iteration modification,and the relative effect of air-gap thickness on the magnetic leakage was in consideration.The modified computation equation of damping torque for the damper was obtained at last.The results showed that the damping torque had linearity relationship with the rotation speed measured in the scope of rotation speed from 0~500r/min.The test results of the prototypes were agreed with the computation values through modified model.