高驱动力密度短时工作电磁直线执行器研究

High drive force density electromagnetic linear actuator for short-term operation

针对航空航天、车辆等领域对短时工作直线执行器高驱动力密度的要求,该文以提高驱动力密度为目的改进了执行器样机,研究了动圈式电磁直线执行器短时工作的性能。基于建立的执行器温度-电磁场双向耦合有限元模型,分析了目标有效电流与可持续工作时间的关系,研究了执行器高驱动力密度短时工作的性能表现和失效情况。同时,通过搭建的执行器性能测试系统,测试了样机的温升和输出力情况,测试结果与仿真分析吻合。结果表明,执行器样机短时工作的驱动力密度可达830 N/kg,是连续工作最大驱动力密度的6倍,可持续工作时间大于0.5 s。

In order to make the drive force density of the electromagnetic linear actuator in short-term operation meet the requirements of aerospace,vehicle and other fields,the prototype is studied deeply to improve the density of the driving force and the performance potential of the moving coil electromagnetic linear actuator in short-term operation. The relationship between the objective effective current and the sustainable working time is analyzed based on the temperature-electromagnetic two-way coupling finite element analysis model,as well as the performance and the failure of the actuator with the high drive force density in short-term operation. Through constructing the actuator performance testing system,the temperature rise and the output force of the actuators are tested and the results and simulation analysis are matched. The results show that the prototype actuator＇s drive force density in short-term operation can achieve 830 N / kg in more than 0. 5 s,which is 6 times the maximum driving force density of the continuous operation.