Machine stator winding insulation degradation is one of the main results of machine aging.It is non-negligible once this degradation process becomes asymmetric between phases.The traditional way to determine the insul...Machine stator winding insulation degradation is one of the main results of machine aging.It is non-negligible once this degradation process becomes asymmetric between phases.The traditional way to determine the insulation state of health is a partial discharge test.However,this method requires the system offline,which causes production loss and extra administrative burden.This paper presents an idea for better characterizing the insulation machine’s state of health using common-mode(CM)behavior in the machine-drive system.With the help of circuit decomposition methods and modeling tools,the CM quantities due to asymmetric aging show a unique characteristic that distinguishes itself from other differential-mode(DM)quantities in the equivalent circuit.It is shown effective to represent the asymmetric aging effect from the detection of system leakage current.This paper provides an analytical method to quantify this characteristic from mathematical approaches,and a proper approximation has been made on the CM equivalent model(CEM)such that the CM behavior is accurately characterized.The proposed method will serve the purpose of predicting machine abnormal behavior using the simple RLC circuit.Researchers can adapt this method to quantify and characterize the machine insulation state of health(SOH).展开更多
为缩小合路器尺寸,提出一种基于公共腔体的合路器的设计方法。采用广义切比雪夫函数求解出支路滤波器的耦合系数,使用AWR电路仿真软件对合路器电路模型进行优化,提取出合路器的耦合矩阵。最后运用电磁仿真软件HFSS提取出物理尺寸,加工...为缩小合路器尺寸,提出一种基于公共腔体的合路器的设计方法。采用广义切比雪夫函数求解出支路滤波器的耦合系数,使用AWR电路仿真软件对合路器电路模型进行优化,提取出合路器的耦合矩阵。最后运用电磁仿真软件HFSS提取出物理尺寸,加工出一款基站用四频合路器。实测结果表明,该器件在通带820~880 MHz的损耗小于1.6 d B,带外抑制大于40 d B@890 MHz,与仿真结果吻合较好,具有很大的实用价值。展开更多
文摘Machine stator winding insulation degradation is one of the main results of machine aging.It is non-negligible once this degradation process becomes asymmetric between phases.The traditional way to determine the insulation state of health is a partial discharge test.However,this method requires the system offline,which causes production loss and extra administrative burden.This paper presents an idea for better characterizing the insulation machine’s state of health using common-mode(CM)behavior in the machine-drive system.With the help of circuit decomposition methods and modeling tools,the CM quantities due to asymmetric aging show a unique characteristic that distinguishes itself from other differential-mode(DM)quantities in the equivalent circuit.It is shown effective to represent the asymmetric aging effect from the detection of system leakage current.This paper provides an analytical method to quantify this characteristic from mathematical approaches,and a proper approximation has been made on the CM equivalent model(CEM)such that the CM behavior is accurately characterized.The proposed method will serve the purpose of predicting machine abnormal behavior using the simple RLC circuit.Researchers can adapt this method to quantify and characterize the machine insulation state of health(SOH).
文摘为缩小合路器尺寸,提出一种基于公共腔体的合路器的设计方法。采用广义切比雪夫函数求解出支路滤波器的耦合系数,使用AWR电路仿真软件对合路器电路模型进行优化,提取出合路器的耦合矩阵。最后运用电磁仿真软件HFSS提取出物理尺寸,加工出一款基站用四频合路器。实测结果表明,该器件在通带820~880 MHz的损耗小于1.6 d B,带外抑制大于40 d B@890 MHz,与仿真结果吻合较好,具有很大的实用价值。
