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公开(公告)号：US20140084937A1
公开(公告)日：2014-03-27
申请号：US13629206
申请日：2012-09-27
发明人： Prabhakar Neti , Karim Younsi , Yingneng Zhou , Manoj Ramprasad Shah , Pinjia Zhang , Charles David Whitefield, II
IPC分类号： G01R31/34
CPC分类号： G01R31/343 , G01R31/1272 , G01R31/346
摘要： Systems and methods are disclosed for on-line monitoring of the condition of the stator insulation of an AC motor or an electric generator. In certain embodiments, the system includes a transformer surrounding each pair of input and output cables associated with a given phase of power provided to the AC motor or generated by the electric generator. In another embodiment, a transformer surrounds the three input cables (for an AC motor) or the three output cables (for an electric generator) that correspond to phases of the AC motor or electric generator. In both embodiments, the transformers generate voltages that may be used to monitor leakage currents associated with the cables. A microcontroller monitors the voltages generated by the transformers and determines the condition of the stator insulation of the AC motor or the electric generator based on the voltages.
摘要翻译： 公开了用于在线监测交流电动机或发电机的定子绝缘的状态的系统和方法。 在某些实施例中，系统包括围绕与提供给AC电动机或由发电机产生的给定相电源相关联的每对输入和输出电缆的变压器。 在另一个实施例中，变压器围绕对应于AC电动机或发电机的相位的三个输入电缆（用于AC电动机）或三个输出电缆（用于发电机）。 在两个实施例中，变压器产生可用于监测与电缆相关联的泄漏电流的电压。 微控制器监视变压器产生的电压，并基于电压确定交流电动机或发电机的定子绝缘的状况。
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公开(公告)号：US20170176536A1
公开(公告)日：2017-06-22
申请号：US14971464
申请日：2015-12-16
摘要： A fault detection system for a wind turbine includes a doubly-fed induction generator (DFIG). The DFIG includes a wye-ring configured for at least three electrical phases. The fault detection system includes a data acquisition system including at least three sensors. Each sensor of said at least three sensors is configured to electrically couple with and measure a respective voltage of each phase of the at least three electrical phases of the wye-ring. The fault detection system further includes an alert system coupled to said data acquisition system. The alert system is configured to apply a Fourier transform to the respective measured voltages of each phase of the at least three electrical phases of the wye-ring. The alert system is further configured to provide an indication of a condition of the wye-ring based upon the transformed measured voltages.
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公开(公告)号：US09541606B2
公开(公告)日：2017-01-10
申请号：US13716969
申请日：2012-12-17
发明人： Prabhakar Neti , Pinjia Zhang
CPC分类号： G01R31/34 , G01M13/045 , G01R31/343
摘要： A method implemented using a controller based device includes receiving a measured electrical signal from an electrical device of an electromechanical device and receiving a measured vibration signal from a mechanical device of the electromechanical device, coupled to the electrical device. The method further includes determining a first signal signature based on the measured electrical signal and determining a second signal signature based on the measured vibration signal. The method also includes determining a diagnostic parameter based on the first signal signature and the second signal signature and determining a fault in the mechanical device based on the diagnostic parameter.
摘要翻译： 使用基于控制器的设备实现的方法包括从机电装置的电气装置接收测量的电信号，并接收来自耦合到电气装置的机电装置的机械装置的测量的振动信号。 该方法还包括基于所测量的电信号确定第一信号签名并基于所测量的振动信号确定第二信号签名。 该方法还包括基于第一信号签名和第二信号签名来确定诊断参数，并且基于诊断参数来确定机械设备中的故障。
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公开(公告)号：US09255970B2
公开(公告)日：2016-02-09
申请号：US13629206
申请日：2012-09-27
发明人： Prabhakar Neti , Karim Younsi , Yingneng Zhou , Manoj Ramprasad Shah , Pinjia Zhang , Charles David Whitefield, II
CPC分类号： G01R31/343 , G01R31/1272 , G01R31/346
摘要： Systems and methods are disclosed for on-line monitoring of the condition of the stator insulation of an AC motor or an electric generator. In certain embodiments, the system includes a transformer surrounding each pair of input and output cables associated with a given phase of power provided to the AC motor or generated by the electric generator. In another embodiment, a transformer surrounds the three input cables (for an AC motor) or the three output cables (for an electric generator) that correspond to phases of the AC motor or electric generator. In both embodiments, the transformers generate voltages that may be used to monitor leakage currents associated with the cables. A microcontroller monitors the voltages generated by the transformers and determines the condition of the stator insulation of the AC motor or the electric generator based on the voltages.
摘要翻译： 公开了用于在线监测交流电动机或发电机的定子绝缘的状态的系统和方法。 在某些实施例中，系统包括围绕与提供给AC电动机或由发电机产生的给定相电源相关联的每对输入和输出电缆的变压器。 在另一个实施例中，变压器围绕对应于AC电动机或发电机的相位的三个输入电缆（用于AC电动机）或三个输出电缆（用于发电机）。 在两个实施例中，变压器产生可用于监测与电缆相关联的泄漏电流的电压。 微控制器监视变压器产生的电压，并基于电压确定交流电动机或发电机的定子绝缘的状况。
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公开(公告)号：US20140172326A1
公开(公告)日：2014-06-19
申请号：US13716933
申请日：2012-12-17
发明人： Pinjia Zhang , Prabhakar Neti
CPC分类号： G01M13/00 , G01M13/04 , G01R31/343 , G06F17/00
摘要： A method implemented using a processor based device includes obtaining a measured electrical signal from an electrical device coupled to a mechanical device and generating a signal signature representative of a fault in the mechanical device based on the measured electrical signal. The method also includes determining a diagnostic parameter based on a harmonic frequency of the signal signature and determining the fault in the mechanical device based on the diagnostic parameter.
摘要翻译： 使用基于处理器的设备实现的方法包括从耦合到机械设备的电气设备获得测量的电信号，并且基于所测量的电信号产生代表机械设备中的故障的信号签名。 该方法还包括基于信号签名的谐波频率来确定诊断参数，并且基于诊断参数确定机械装置中的故障。
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公开(公告)号：US20150311849A1
公开(公告)日：2015-10-29
申请号：US14264332
申请日：2014-04-29
IPC分类号： H02P23/08
CPC分类号： H02P23/08 , H02P21/18 , H02P23/14 , H02P23/16 , H02P27/026 , H02P29/0241
摘要： A method for estimating a speed of an induction motor includes applying a voltage to the induction motor and measuring a current of the induction motor. A current fast fourier transform (FFT) of the current is then determined and a slip of the induction motor is calculated based on the current FFT. A speed of the induction motor is then estimated based on the slip of the induction motor.
摘要翻译： 用于估计感应电动机的速度的方法包括向感应电动机施加电压并测量感应电动机的电流。 然后确定电流的当前快速傅立叶变换（FFT），并且基于当前FFT来计算感应电动机的滑差。 然后基于感应电动机的滑移来估计感应电动机的速度。
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7.发明申请公开(公告)号：US20140303913A1
公开(公告)日：2014-10-09
申请号：US13858277
申请日：2013-04-08
发明人： Prabhakar Neti , Pinjia Zhang , Stefan Grubic
IPC分类号： G01R31/34
CPC分类号： G01R31/34 , G01R31/343 , H02P29/0241
摘要： A method for detection of rotor bar faults in an electric machine is provided. The method includes acquiring electrical signals from the electric machine that are representative of the operative condition of the machine. The symmetrical components from the electrical signals are eliminated by squaring an instantaneous value of each data point from the electrical signals and summing the squared values. The method further includes the step of eliminating discontinuities in the electrical signals by applying a window function to compute weighted representation of the squared values. Furthermore, the method includes the step of normalizing the weighted representation to obtain spectral information. The faults in the rotor bar are detected by analyzing the spectral information obtained after normalization.
摘要翻译： 提供了一种用于检测电机中转子条故障的方法。 该方法包括从电机获取代表机器操作状态的电信号。 通过从电信号中平均每个数据点的瞬时值并对平方值求和来消除来自电信号的对称分量。 该方法还包括通过应用窗口函数来计算平方值的加权表示来消除电信号中的不连续性的步骤。 此外，该方法包括归一化加权表示以获得光谱信息的步骤。 通过分析归一化后获得的光谱信息来检测转子条中的故障。
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公开(公告)号：US20140167810A1
公开(公告)日：2014-06-19
申请号：US13716969
申请日：2012-12-17
发明人： Prabhakar Neti , Pinjia Zhang
IPC分类号： G01R31/34
CPC分类号： G01R31/34 , G01M13/045 , G01R31/343
摘要： A method implemented using a controller based device includes receiving a measured electrical signal from an electrical device of an electromechanical device and receiving a measured vibration signal from a mechanical device of the electromechanical device, coupled to the electrical device. The method further includes determining a first signal signature based on the measured electrical signal and determining a second signal signature based on the measured vibration signal. The method also includes determining a diagnostic parameter based on the first signal signature and the second signal signature and determining a fault in the mechanical device based on the diagnostic parameter.
摘要翻译： 使用基于控制器的设备实现的方法包括从机电装置的电气装置接收测量的电信号，并接收来自耦合到电气装置的机电装置的机械装置的测量的振动信号。 该方法还包括基于所测量的电信号确定第一信号签名并基于所测量的振动信号确定第二信号签名。 该方法还包括基于第一信号签名和第二信号签名来确定诊断参数，并且基于诊断参数来确定机械设备中的故障。
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公开(公告)号：US10184985B2
公开(公告)日：2019-01-22
申请号：US14971464
申请日：2015-12-16
摘要： A fault detection system for a wind turbine includes a doubly-fed induction generator (DFIG). The DFIG includes a wye-ring configured for at least three electrical phases. The fault detection system includes a data acquisition system including at least three sensors. Each sensor of said at least three sensors is configured to electrically couple with and measure a respective voltage of each phase of the at least three electrical phases of the wye-ring. The fault detection system further includes an alert system coupled to said data acquisition system. The alert system is configured to apply a Fourier transform to the respective measured voltages of each phase of the at least three electrical phases of the wye-ring. The alert system is further configured to provide an indication of a condition of the wye-ring based upon the transformed measured voltages.
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公开(公告)号：US09645046B2
公开(公告)日：2017-05-09
申请号：US13716933
申请日：2012-12-17
发明人： Pinjia Zhang , Prabhakar Neti
CPC分类号： G01M13/00 , G01M13/04 , G01R31/343 , G06F17/00
摘要： A method implemented using a processor based device includes obtaining a measured electrical signal from an electrical device coupled to a mechanical device and generating a signal signature representative of a fault in the mechanical device based on the measured electrical signal. The method also includes determining a diagnostic parameter based on a harmonic frequency of the signal signature and determining the fault in the mechanical device based on the diagnostic parameter.
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