公开(公告)号：US20150260794A1

公开(公告)日：2015-09-17

申请号：US14626026

申请日：2015-02-19

Applicant: ROLLS-ROYCE PLC

Inventor： Subash C. ATHIKESSAVAN ,  Sivakumar NADARAJAN ,  Amit Kumar GUPTA ,  Sanjib K. PANDA

IPC: G01R31/34 ,  G01R23/02

CPC classification number: G01R31/343

Abstract: A method of detecting a fault in an induction machine having one or more windings arranged to draw current at a supply frequency, the method including: performing a process of judging whether a respective sideband of one or more selected harmonics of the supply frequency exists at a predetermined fault frequency in a signal in the one or more windings; and determining that a fault has occurred if the judgement is positive; wherein in the judging process each of the selected harmonics of the supply frequency is a harmonic frequency of the supply frequency other than the supply frequency itself.

Abstract translation: 一种用于检测感应电机中的故障的方法，所述感应电机具有布置成以电源频率抽取电流的一个或多个绕组，所述方法包括：执行判断电源频率中一个或多个所选谐波的相应边带是否存在于 在一个或多个绕组中的信号中预定的故障频率; 并确定如果判断为正，则发生故障; 其中，在所述判定处理中，所述供给频率的选择谐波中的每一个是供给频率本身以外的供给频率的谐波频率。

公开(公告)号：US20160216334A1

公开(公告)日：2016-07-28

申请号：US14988302

申请日：2016-01-05

Applicant: ROLLS-ROYCE plc

Inventor： Subash C. ATHIKESSAVAN ,  Sivakumar NADARAJAN ,  Amit K. GUPTA ,  Sanjib K. PANDA ,  Chandana J. GAJANAYAKE

IPC: G01R31/34

CPC classification number: G01R31/34 ,  G01R23/20 ,  G01R31/343 ,  G01R31/346

Abstract: A method of detecting a stator fault in a multi-phase current induction machine including the steps of: obtaining a respective frequency spectrum for each of the current phases in the induction machine; deriving, from each frequency spectrum, a value for the ITHD (Inverse current Total Harmonic Distortion) for the respective current phase; calculating an ITHD deviation value corresponding to the maximum deviation for the derived ITHD values; judging whether the calculated ITHD deviation value differs from a reference deviation value; and determining, in response to a positive judgement, that there is a stator fault.

Abstract translation: 一种检测多相电流感应电机中的定子故障的方法，包括以下步骤：为感应电机中的每个电流相位获得相应的频谱; 从每个频谱推导出用于各个当前阶段的ITHD（逆电流总谐波失真）的值; 计算对应于所导出的ITHD值的最大偏差的ITHD偏差值; 判断所计算的ITHD偏差值是否与参考偏差值不同; 并且响应于肯定判断确定存在定子故障。