用于电机散热的定形复合相变材料研究  

Study of Composite Phase Change Materials for Heat Dissipation of Motor

作　　者：陈鑫 刘凌云[1] 陶马冠宇 王晓光[1] 柳建军 CHEN Xin;LIU Lingyun;TAO Maguanyu;WANG Xiaoguang;LIU Jianjun(Hubei Collaborative Innovation Center for High Efficiency Utilization of Solar Energy,Hubei University of Technology,Wuhan 430068,China;Xiangyang TTE Electric Co.,Ltd.,Zaoyang 441200,Hubei,China)

机构地区：[1]湖北工业大学太阳能高效利用湖北省协同创新中心,武汉430068 [2]襄阳市三三电气有限公司,湖北枣阳441200

出　　处：《材料导报》2022年第19期28-34,共7页Materials Reports

基　　金：国家自然科学基金(51171061);湖北省教育厅重点项目(D20201407)。

摘　　要：以石蜡作为相变物质,与埃洛石复合,以无水乙醇为溶剂,采用溶液插层法制备出不同配比的新型石蜡/埃洛石复合相变材料。使用扫描电镜(SEM)观察其表面形貌,对材料相变过程中的形状稳定性进行测试,采用差示扫描量热法(DSC)对其相变温度和相变焓进行了测定,用热重分析仪(TGA)对其热稳定性进行了表征;确定石蜡与埃洛石的最佳配比后,添加少量四针状氧化锌(T-ZnOw)提高其导热性能,使用导热仪器测试其导热系数。将复合相变材料与烘干型绝缘漆混合加热并浇注到电机定子绕组上,电机连通电源后使用红外测温仪和温敏电阻测量其温度。结果表明:当石蜡质量分数为50%时,石蜡能被埃洛石有效封装,保证了材料的的定形相变特征,添加T-ZnOw能有效提高材料的导热性能;复合相变材料与烘干型绝缘漆浇注到电机定子绕组上时能有效地降低内部温升,对降低短时高功率密度电机的内部温度和提高其功率密度具有重要的应用价值。A novel composite phase change material(PCM)with various ratio of paraffin/halloysite was prepared by solution intercalated reaction,in which paraffin acted as a PCM,halloysite as a container and absolute alcohol as solvent.Scanning electron microscopy(SEM)was used to observe the surface morphology of the materials.The shape stability during phase change process of this composite was tested.Thermogravimetry analyzer(TGA)and differential scanning calorimetry(DSC)were used to measure the thermal stability,phase-change temperature and phase-transition enthalpy.After determining the optimum ratio of paraffin to halloysite,a small amount of tetrapod ZnO whiskers(T-ZnOw)were added to improve heat conduction performance,and the thermal conductivity was tested.The composite phase change material and drying insulating paint were mixed,heated and poured onto the motor stator windings.After the motor was connected to the power supply,the temperature was recorded with an infrared thermometer and temperature sensitive resistance.The results show that when the mass fraction of paraffin is 50%,the paraffin can be effectively encapsulated by halloysite,thus guaranteeing excellent shape-stabilized phase change feature.The addition of T-ZnOw can effectively improve the heat conduction performance.When the material is poured into the stator winding of the motor,the internal temperature rise can be effectively reduced.The composite materials have an important application value to decrease the internal temperature of the short-time high-power density motor,and to improve the power density of the motor.

关 键 词：石蜡 埃洛石 四针状氧化锌(T-ZnOw) 相变材料 溶液插层法 

分 类 号：TM304[电气工程—电机]