摘要
某智能锁具在存放和使用过程中发生直流有刷电机停转现象。利用万用表、体视显微镜、扫描电子显微镜、能谱仪、红外光谱仪等手段对停转电机的参数、污染物宏观微观形貌、污染物微区成分进行分析;对污染物来源进行排查;结果表明:产品中所用黑色塑料外壳中的磷系阻燃剂在高温高湿环境中通过水解和热氧老化挥发形成磷酸二氢铵,沉积在电刷和换向器上,导致电刷和换向器之间接触不良。进而无电流流向线圈,导致电机不转。并提出了相应的措施,为进一步提高电机使用可靠性提供有益依据。
A smart lock occurs during storage and use,and the DC brush motor stops.The parameters,macroscopic morphology and microstructure of pollutants and the micro-composition of pollutants were analyzed by means of multimeter,stereo microscope,scanning electron microscope,energy dispersive instrument and infrared spectrometer.Investigate the source of the contaminant;The results show that the phosphorus-based flame retardant in the black plastic shell used in the product volatilizes to form ammonium dihydrogen phosphate through hydrolysis and thermal oxidative aging in a high temperature and high humidity environment,which is deposited on the brush and the commutator,resulting in poor contact between the brush and the commutator.In turn,no current flows to the coil,causing the motor to not rotate.And put forward corresponding measures to provide a useful basis for further improving the reliability of the motor.
作者
马宇辉
姜勇
MA Yu-hui;JIANG Yong(Zhuhai Unitech Technology,Zhuhai 519000)
出处
《环境技术》
2024年第9期161-167,共7页
Environmental Technology
关键词
直流微电机
停转
污染
成分分析
磷酸二氢铵
DC micromotor
shutdown
contamination
ingredient analysis
ammonium monobasic phosphate
