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公开(公告)号：US09977085B2
公开(公告)日：2018-05-22
申请号：US15507110
申请日：2015-09-08
Applicant: ABB Schweiz AG
Inventor： Pedro Rodriguez , Subrat Sahoo , Cajetan Pinto
CPC classification number: G01R31/346 , G01R31/343 , H02P9/10 , H02P29/0243
Abstract: A method and system of determining an electro-mechanical fault condition in a synchronous machine having a stator, a rotor, and exciter. The method includes: a) obtaining an exciter current signal which is a measurement of an exciter current through stationary windings of the exciter, b) transforming the exciter current signal to obtain an exciter current frequency spectrum, and c) determining whether an electro-mechanical fault condition is present, and a type of the electro-mechanical fault condition, based on harmonic content related to the frequency of the stator, of the exciter current frequency spectrum.
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公开(公告)号：US10768236B2
公开(公告)日：2020-09-08
申请号：US16496863
申请日：2018-03-06
Applicant: ABB Schweiz AG
Inventor： Pedro Rodriguez , Subrat Sahoo
Abstract: A rotor bar fault in a rotor of an electrical machine having a plurality of rotor bars and an end ring configured to short circuit the rotor bars. The method includes the steps of measuring a first temperature at a first end ring location, and measuring a second temperature at a second end ring location, the second end ring location being different from the first end ring location. As broken rotor bars cause a non-uniform temperature distribution in the end ring, the detection of rotor bar faults can be based on monitored temperatures at different end ring locations.
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3.发明授权公开(公告)号：US09829540B2
公开(公告)日：2017-11-28
申请号：US15157644
申请日：2016-05-18
Applicant: ABB Schweiz AG
Inventor： Luca Peretti , Mehanathan Pathmanathan , Omer Ikram Ul Haq , Subrat Sahoo
CPC classification number: G01R31/34 , G01M5/0066 , G01M13/028 , G01M13/045
Abstract: A method for determining an undesired condition in an electrical drive system including an electrical machine and an electrical drive, wherein the method includes a) obtaining a measured signal of an electrical or mechanical parameter, b) obtaining a frequency spectrum of the measured signal, that contains a measured frequency component, c) determining whether the measured frequency component is within a predetermined distance from a trend line, which trend line is associated with only one specific frequency component of the electrical or mechanical parameter present during a specific undesired condition, d) on the condition that the measured frequency component is within the predetermined distance from the trend line increasing a counter associated with the trend line, e) repeating steps a) to d), wherein in case the counter reaches a predetermined number determining that the electrical drive system is subjected to the undesired condition associated with the trend line.
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Patent Agency Ranking
公开(公告)号：US09945907B2
公开(公告)日：2018-04-17
申请号：US15124948
申请日：2015-03-04
Applicant: ABB Schweiz AG
Inventor： Pedro Rodriguez , Subrat Sahoo
IPC: G01R31/34 , H02P29/024
CPC classification number: G01R31/34 , G01R31/343 , H02P29/0241
Abstract: A method of determining a fault condition in a synchronous machine. The method includes a) obtaining a field current signal and a shaft voltage signal of the synchronous machine, b) transforming the field current signal and the shaft voltage signal to obtain a field current frequency spectrum and a shaft voltage frequency spectrum, and c) determining whether a fault condition is present, and in case a fault condition is present identifying a type of the fault condition, based on harmonic content of the field current frequency spectrum and harmonic content of the shaft voltage frequency spectrum, wherein c) includes comparing the harmonic content of the field current frequency spectrum with fault condition field current signature spectra and comparing the harmonic content of the shaft voltage frequency spectrum with fault condition shaft voltage signature spectra.
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公开(公告)号：US11513155B2
公开(公告)日：2022-11-29
申请号：US15963480
申请日：2018-04-26
Applicant: ABB Schweiz AG
Inventor： Pedro Rodriguez , Subrat Sahoo , Cajetan Pinto
IPC: G01R31/34 , H02P29/024
Abstract: A method and device of determining a fault condition in a synchronous motor including a rotor provided with damper bars and an end ring to which the damper bars are mechanically connected thereby forming a damper cage, wherein the method includes: obtaining a first measurement of an end ring current from a first location along the end ring, processing the first measurement to thereby obtain a processing result, and determining whether a fault condition is present in the synchronous motor based on the processing result.
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公开(公告)号：US11342819B2
公开(公告)日：2022-05-24
申请号：US15762459
申请日：2016-10-04
Applicant: ABB Schweiz AG
Inventor： Pedro Rodriguez , Subrat Sahoo , Cajetan Pinto , Klaus Vänskä
Abstract: A method for preventing a frequency component of a voltage from occurring in an electrical machine including the steps of: obtaining, either by measuring a voltage signal or a current signal from the electrical machine in time domain and transforming the measured signal into frequency domain, by simulating or deducing a first frequency component present in the electrical machine in absence of a grounding, the first frequency component representing a first undesired frequency higher than a limit frequency of 500 Hz; and providing the electrical machine with a first grounding at a grounding location, the first grounding including a resonant circuit resonating at the first undesired frequency. In order to get rid of harmful shaft voltages in the form of sharp voltage peaks at high frequencies, it is first necessary to determine at which undesired frequency or frequencies these voltage peaks occur. Only thereafter can a low impedance grounding be provided that works satisfactorily at the undesired frequency or frequencies.
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公开(公告)号：US20200110133A1
公开(公告)日：2020-04-09
申请号：US16496863
申请日：2018-03-06
Applicant: ABB Schweiz AG
Inventor： Pedro Rodriguez , Subrat Sahoo
Abstract: A rotor bar fault in a rotor of an electrical machine having a plurality of rotor bars and an end ring configured to short circuit the rotor bars. The method includes the steps of measuring a first temperature at a first end ring location, and measuring a second temperature at a second end ring location, the second end ring location being different from the first end ring location. As broken rotor bars cause a non-uniform temperature distribution in the end ring, the detection of rotor bar faults can be based on monitored temperatures at different end ring locations.
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公开(公告)号：US20170016960A1
公开(公告)日：2017-01-19
申请号：US15124948
申请日：2015-03-04
Applicant: ABB SCHWEIZ AG
Inventor： Pedro Rodriguez , Subrat Sahoo
IPC: G01R31/34
CPC classification number: G01R31/34 , G01R31/343 , H02P29/0241
Abstract: A method of determining a fault condition in a synchronous machine. The method includes a) obtaining a field current signal and a shaft voltage signal of the synchronous machine, b) transforming the field current signal and the shaft voltage signal to obtain a field current frequency spectrum and a shaft voltage frequency spectrum, and c) determining whether a fault condition is present, and in case a fault condition is present identifying a type of the fault condition, based on harmonic content of the field current frequency spectrum and harmonic content of the shaft voltage frequency spectrum, wherein c) includes comparing the harmonic content of the field current frequency spectrum with fault condition field current signature spectra and comparing the harmonic content of the shaft voltage frequency spectrum with fault condition shaft voltage signature spectra.
Abstract translation: 一种确定同步电机故障状态的方法。 该方法包括a）获得同步电机的励磁电流信号和轴电压信号，b）转换励磁电流信号和轴电压信号，获得励磁电流频谱和轴电压频谱，c）确定 根据场电压频谱的谐波含量和轴电压频谱的谐波含量，确定是否存在故障状况，以及在存在故障状况的情况下识别故障状况的类型，其中c）包括比较谐波 将现场频谱的内容与故障状态场电流特征谱进行比较，并将轴电压频谱的谐波含量与故障状态轴电压特征谱进行比较。
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