四川航天烽火伺服控制技术有限公司
TK121
国家重点研发计划项目(2019YFB2005104)；成都市重大科技创新项目(2021-YF08-00012-GX)；
Sichuan Aerospace Fenghuo Servo Control Technology Corporation,Chengdu
National key research and development program (2019YFB2005104); Major Science and Technology Innovation Projects in Chengdu (2021-YF08-00012-GX).
电磁铁作为电液控制系统的核心液压元件广泛应用于航空航天和石油工业等领域,其工作产生的焦耳热和电磁损耗会导致温度迅速升高、局部热应力和不均匀膨胀变形,严重影响稳定性和使用寿命。本文采用有限元软件研究电磁铁温度、应力及变形的演化规律,分析导热套筒散热与强制对流散热对其热性能的影响规律。结果表明：随线圈功率的增大电磁铁的最大温度、热应力和变形量均线性增大；随套筒厚度的增加,稳态的最大温度、变形量和导热量线性减小,温降幅度为12.5℃/mm；随流速的增加,最大温度、热应力和变形量显著减小,温降幅度45.5℃/(m/s),说明增强导热和对流均能提高电磁铁热性能且对流更为显著。
As the core hydraulic components of electro-hydraulic control systems, electromagnets are widely used in aerospace and petroleum industries. The Joule heat and electromagnetic loss generated by its operation will lead to rapid temperature increase, local thermal stress and uneven expansion deformation, which will seriously affect the stability and service life. The evolution law of temperature, stress and deformation of electromagnet was studied by finite element software, and the influence law of heat dissipation of heat conduction sleeve and forced convection heat dissipation on its thermal performance was analyzed. The results show that the maximum temperature, thermal stress and deformation of the electromagnet increase linearly with the increase of the coil power, and with the increase of sleeve thickness, the steady-state maximum temperature, deformation and thermal conductivity decrease linearly, and the temperature drop is 12.5℃/mm. Moreover, With the increase of flow rate, the maximum temperature, thermal stress and deformation decreased significantly, and the temperature drop range was 45.5℃/(m/s). It shows that both enhanced heat conduction and convection can improve the thermal performance of electromagnet, and convection is more significant.
