封装工艺对电枢热导率影响的实验研究  

An Experimental Study on the Effect of Varnish on the Thermal Conductivity of Armature

作　　者：李兆宗 张承宁[1] 章恒亮 张硕[1] Li Zhaozong;Zhang Chengning;Zhang Hengliang;Zhang Shuo(School of Mechanical Engineering and Vehicle Engineering,Beijing Institute of Technology,Beijing100081;School of Electrical Engineering,Southeast University,Nanjing210096;School of Electrical Engineering,University of Nottingham,the United Kingdom,NottinghamNG72GT)

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]东南大学电气工程学院,南京210096 [3]诺丁汉大学电气工程学院,英国诺丁汉NG72GT

出　　处：《汽车工程》2023年第7期1244-1253,共10页Automotive Engineering

基　　金：国家重点研发计划(2022YFB2502703)资助。

摘　　要：车用电机为满足不同驱动结构的需求,通常会在高转速和高转矩之间做出选择。为实现车用电机的高效区优化,多样化的电枢结构被应用于各类电机。相对于静态电器中使用的电枢,车用电机电枢最显著的特征在于其普遍需要使用非金属材料进行封装。但目前对于具有封装工艺的各类电枢,鲜有模型能够对其轴向热导率进行合理的预测。本文选取包括发卡绕组、圆形漆包线、换位漆包线、圆形利兹线和矩形利兹线在内的9款车用电机常见的电枢结构进行了研究。首先设计了一款用于测量电枢轴向热导率的实验台架,并提出一种补偿实验台架误差的数学方法。之后测量了9款电枢在封装前后的轴向热导率差异。最后基于各类电枢的加工方法和实验结果,分别对“平行电枢”和“绞合电枢”提出了考虑封装工艺对其影响的轴向热导率数学模型和经验公式。In order to meet the demand of various driving structures,electric motors for EVs usually have to make a choice between high speed and high torque.To optimize the high efficiency area of EV motors,multiple armature structures are applied to the motors.Compared with armatures used in static electric facilities,the most notable feature of EV motor armature is that they generally need to be varnished with non-metallic materials.However,few models can reasonably predict the axial thermal conductivity of armatures with the casting process.In this paper,9 common armature structures of motor are studied,including hairpin winding,enameled wire,transposition wire,circular litz wire and rectangular litz wire.A test bench for measuring the axial thermal conductivity is established at first,and a mathematical method for compensating the tolerance of the experimental bench is proposed.Then,the axial thermal conductivity differences of 9 armatures before and after varnishing are tested and compared.Finally,based on the machining methods and experimental results of various kinds of armatures,the mathematical model and empirical formula of axial thermal conductivity for"Parallel Winding"and"Twisted Winding"armatures are presented respectively,considering the influence of varnish process.

关 键 词：车用电机 绞合电枢 热导率 实验台架补偿 

分 类 号：U466[机械工程—车辆工程]