大功率扬声器音圈断线的失效分析及改善  

Failure Analysis and Improvement of Broken Wire of Loudspeaker Voice Coil

作　　者：王世伟 谢守华 陈进 黄汉雄 WANG Shiwei;XIE Shouhua;CHEN Jin;HUANG Hanxiong(GuoGuang Electric Company Limited,Guangzhou 510800,China;Guangdong Provincial Key Laboratory of electroacoustic electronic technology R&D and application,Guangzhou 510800,China)

机构地区：[1]国光电器股份有限公司,广东广州510800 [2]广东省电声电子技术研发与应用企业重点实验室,广东广州510800

出　　处：《电声技术》2021年第5期27-31,共5页Audio Engineering

基　　金：科技部2018“现代服务业共性关键技术研发及应用示范”重点专项项目(No.2018YFB1403800;No.2018YFB1403803)。

摘　　要：结合扬声器音圈(Voice Coil,VC)线材材质及补强胶特性,分析功率试验时音圈断线失效的原因。扬声器工作时,随着音圈温度的升高,环氧型补强胶由于耐温不足会逐渐产生疲劳及补强失效现象。随着补强胶对铜包铝(Copper Clad Aluminium Wire,CCAW)音圈线的粘合力下降以及音圈的持续往复振动,线径较细且韧性较差的CCAW线在补强较弱的位置产生裂纹,在电流的持续作用下,裂纹位置发生尖端放电现象并击穿线体,熔点较低的铝芯发生了熔融后凝固的现象,最终造成音圈线的断路失效。经理论分析和试验验证,使用耐温更高的聚酰胺型补强胶可以改善失效问题。Combination speaker voice coil(VC)wire materials and reinforcing glue properties to analysis the reason of VC wire fracture when power testing.With the temperature increasing of VC,epoxy type reinforcing glue due to the insufficient heat-resistance quality would gradually produce fatigue and reinforcing failure phenomenon.As reinforcing glue on Copper Clad Aluminum Wire(CCAW)VC wire bonding strength declined and sustainable reciprocating vibration of VC.Under the continuous action of current,the point discharge phenomenon occurred at the crack position and breakdown the wire.The lower melting point Al core which melting and solidified,and finally caused the open circuit failure of the VC.Through theoretical analysis and experimental verification,failure of the case could be improved by using polyamide type reinforcing glue which had higher temperature resistance.

关 键 词：音圈 铜包铝线 补强胶 击穿 断线 

分 类 号：TN643[电子电信—电路与系统]