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

被引：0
|
作者：
Li Z. [1 ,3 ]
Zhang C. [1 ]
Zhang H. [2 ,3 ]
Zhang S. [1 ]
机构：
[1] School of Mechanical Engineering and Vehicle Engineering, Beijing Institute of Technology, Beijing
[2] School of Electrical Engineering, Southeast University, Nanjing
[3] School of Electrical Engineering, University of Nottingham, Nottingham
来源：
Qiche Gongcheng/Automotive Engineering | 2023年 / 45卷 / 07期
关键词：
experimental bench compensation; motors for EVs; thermal conductivity; twisted armature;
D O I：
10.19562/j.chinasae.qcgc.2023.07.015
中图分类号：
学科分类号：
摘要：
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. © 2023 SAE-China. All rights reserved."
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页码：1244 / 1253
页数：9
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