摘要
电主轴是机电一体化产品,充分考虑并预测其动态特性是机床主轴系统优化设计的前提。基于电主轴内部磁场、电场、温度场、结构场间的耦合关系,建立了150MD24Z7.5高速电主轴多场耦合有限元模型,通过电主轴电机电磁损耗及轴承摩擦生热计算,仿真电主轴温度场及结构场变化,讨论电主轴热态特性与振动特性之间耦合关系,分析电主轴温升热膨胀后气隙变化对振动特性的影响并通过实验加以验证。研究结果表明,电主轴温升形变对振动幅值影响较大,其中由气隙变化引起的电磁力幅值增加12.1%。利用该多场耦合模型可预测电主轴振动幅值,预测误差为10.2%。
Motorized spindles are products of electromechanical integration. Their dynamic performance analysis and prediction are the preconditions for optimization design of machine tool spindle systems. Based on the coupling relationship among magnetic field, electric field, temperature field and structural field in a motorized spindle, the finite element model with multi-field coupled for 150MD24Z7. 5 motorized spindle was established here. By calculating electromagnetic loss and bearing friction heat, the temperature field and structural field of the motorized spindle were simulated. The coupling relationship between thermal characteristics and vibration characteristics of the motorized spindle was discussed. The effects of air-gap variation after thermal deformation on the spindle＇s vibration characteristics were analyzed and verified with tests. The results showed that thermal deformation has larger influences on the vibration amplitude, electromagnetic force amplitude increases about 12.1% due to the change of air-gap; with this model, the vibration amplitude of the motorized spindle can be predicted with an error of 10.2%.
出处
《振动与冲击》
EI
CSCD
北大核心
2016年第1期59-65,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(51375317)
辽宁省科技创新重大专项(201301001)
辽宁自然科学基金项目:(2014020069)
关键词
电主轴
耦合
预测
动态性能
motorized spindle
coupling
prediction
dynamic performance
