超精密短行程直线电机温度场分析及温升抑制  

Temperature Field Analysis and Temperature Rise Suppression of Ultra-Precision Short-Stroke Linear Motor

作　　者：李立毅[1] 潘东华[1] 黄旭珍[1] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001

出　　处：《电工技术学报》2013年第11期112-117,共6页Transactions of China Electrotechnical Society

基　　金：国家科技重大专项(2009ZX02207-001);国家自然科学基金(51177024)资助项目

摘　　要：针对超精密短行程直线电机具有高推力密度、近零散热的工况特点,提出一种双边表贴式水冷结构从而达到抑制绕组温升及对热源进行热屏蔽的目的。首先,通过传热学公式与有限元模型相结合方式建立冷却结构的散热模型;在此基础上,建立短行程直线电机热网络模型,通过对该模型分析提出增加导热支路方法来抑制电机侧表面温升,有限元仿真计算结果表明侧表面温升得以有效抑制(10℃降至2℃以内)。最终,通过样机实验验证了绕组在连续通以电流密度为19A/mm2的电流时,表面最高温升在2℃以内,实现超精密短行程直线电机的近零散热。研究结果不仅为超精密直线电机提供了一种有效的冷却方案,并且建立起的温度场模型为该类电机的优化设计提供了理论依据。A novel double layer water cooling structure is proposed to suppress temperature rise of windings and shield thermal flow of motor surface, because the ultra-precision short- stroke linear motor（SSLM） is used to nanopositioning system. Firstly, the cooling model of cooling plate is established by FEM and analytic formulas; and then the thermal network model of short-stroke linear motor is established to analyze side surface temperature rise of motor, and proposed addition heat flow branch method to suppress surface temperature rise. The FEM results show that the side surface temperature rise of short-stroke linear motor is reduce from 10℃ to 2 ℃. The temperature testing results of prototype show that the maximum temperature rise of motor surface is 2℃, so this cooling structure could shield windings heat flow. In addition, thermal field model is as theory basis for design and optimization of ultra-precision short- stroke linear motor.

关 键 词：直线电机 水冷结构 热网络模型 温度场 

分 类 号：TM315[电气工程—电机]