高速高性能电主轴热态性能分析

Thermal Performance Analysis of High-speed High-performance Motorized Spindle

基于高速电主轴的能量流模型,应用摩擦学和电磁学理论分别计算轴承的生热率和内置电机的电磁损耗;应用传热学理论,确定电主轴的热边界条件。在此基础上建立电主轴有限元分析模型,并对其仿真分析和求解。结果表明,前端轴承、主轴前端和定子是电主轴温升最严重的部位,且在主轴运行初始阶段,温升最快。因此要改善电主轴的热态性能,不仅要在温升严重部位添加冷却装置,而且在主轴启动阶段要做好润滑和冷却工作。

Based on the power flow model of high speed motorized spindle,by using tribology and electromagnetics theory,the heat rate of bearing and the electromagnetic loss of built-in motor are respectively calculated.Utilizing the heat transfer theory,the thermal boundary conditions of spindle are calculated.On this basis,the finite element analysis model of the motorized spindle is built and calculated.The results show that front bearing,front end of spindle and stator are the most serious parts of temperature rise for motorized spindle;and in the initial stage of spindle operation,temperature rise of spindle is the fastest.Therefore in order to improve the spindle thermal characteristics,not only cooling device should be added in the serious parts of temperature rise,but also in the start-up phase,the motorized spindle should be cooled and lubricated effectively.