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公开(公告)号：US20180095134A1
公开(公告)日：2018-04-05
申请号：US15702182
申请日：2017-09-12
申请人： ROLLS-ROYCE plc
CPC分类号： G01R31/346 , F02C3/04 , G01R31/343 , G06F16/285 , H02P9/107 , H02P29/0243 , H02P2101/25 , H02P2103/20
摘要： A method of classifying a stator winding fault in a brushless synchronous generator includes measuring an electrical parameter of the stator winding and classifying the fault by calculating positive or negative sequence harmonics of the parameter and comparing one or more harmonic component to a threshold.
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公开(公告)号：US20150198655A1
公开(公告)日：2015-07-16
申请号：US14573759
申请日：2014-12-17
申请人： ROLLS-ROYCE PLC.
发明人： Vaiyapuri VISWANATHAN , Amit Kumar GUPTA , Chandana Jayampathi GAJANAYAKE , Sivakumar NADARAJAN
CPC分类号： G01R31/2632 , G01R23/02 , G01R31/343 , G01R31/40 , H02H7/1255 , H02K11/20
摘要： A method of detecting a diode fault in an AC signal rectifier circuit, the AC signal rectifier circuit including a plurality of diodes, and being arranged to supply a rectified output voltage to a load, wherein the method includes the steps of deriving an operating value indicative of the ratio of the voltage magnitudes of a first harmonic frequency and another harmonic frequency of the rectified output voltage across the load; and determining whether a fault has occurred in one or more diodes on the basis of the derived operating value. The first harmonic frequency is preferably the fundamental harmonic frequency, and/or the another harmonic frequency is preferably the 6th harmonic frequency.
摘要翻译： 一种检测交流信号整流电路中的二极管故障的方法，所述交流信号整流电路包括多个二极管，并且被布置为向负载提供经整流的输出电压，其中所述方法包括以下步骤：导出指示 的一次谐波频率的电压幅度与整个负载的整流输出电压的另一个谐波频率之比; 以及基于导出的操作值来确定在一个或多个二极管中是否发生故障。 一次谐波频率优选为基本谐波频率，和/或另一谐波频率优选为6次谐波频率。
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公开(公告)号：US20180100895A1
公开(公告)日：2018-04-12
申请号：US15705716
申请日：2017-09-15
申请人： ROLLS-ROYCE plc
CPC分类号： G01R31/346 , G01H1/003 , G01H3/04 , G01H3/08 , G01M1/16
摘要： There is disclosed a method for diagnosing a fault condition in an electric machine 4. The method comprises measuring S2 at least one physical parameter generated during operation of the electric machine 4; analysing S4 the or each measured parameter in a frequency domain; and determining S12 whether the electric machine 4 has a stator or rotor winding fault based on a comparison of an amplitude of the or each analysed parameter at a first predetermined frequency and a first threshold amplitude for the first frequency. The at least one physical parameter comprises a sound generated by the electric machine 4.
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公开(公告)号：US20170160330A1
公开(公告)日：2017-06-08
申请号：US15347499
申请日：2016-11-09
申请人： ROLLS-ROYCE plc
CPC分类号： G01R31/02 , G01R31/34 , H02P9/14 , H02P25/03 , H02P29/0241
摘要： A rectifier diode failure detection apparatus for an electrical machine (10), the electrical machine (10) comprising an exciter armature winding (28a-c), a rotor main field winding (24) and first and second rectifiers (34a, 34b) arranged in parallel, each rectifier (34a, 34b) comprising at least first and second diodes (38a, 38b), each rectifier being configured to independently supply the rotor main field winding (24) with DC electrical current, the failure detection apparatus comprising:a controller (40) comprising at least two current sensors (42a, 42b), each current sensor (42a, 42b) being configured to measure output current (If1, If2) of a respective one of the rectifiers (34a, 34b), and the controller (40) being configured to determine a harmonic of the measured rectifier output currents; the controller (40) being further configured to determine a ratio of the magnitude of the first rectifier (34a) output current harmonic to the magnitude of the second rectifier (34b) output current harmonic, wherein the controller (40) is configured to determine that a fault has occurred in one of the rectifier diodes (38a, 38b) where the ratio exceeds a threshold value.
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公开(公告)号：US20190081532A1
公开(公告)日：2019-03-14
申请号：US16124240
申请日：2018-09-07
申请人： ROLLS-ROYCE plc
摘要： An electrical machine has a variable reluctance rotor, and a stator formed as an annular array of stator segments. The reluctance of the rotor-to-stator magnetic flux path varies with rotor position whereby the stator segments are magnetically energizable to rotate the rotor. The stator segments are arranged in the array such that, when energized to rotate the rotor, they produce an unbalanced force on the rotor. The machine further has a compensator including one or more balancing segments which are configured to be magnetically energizable to produce a balancing force on the rotor which balances the unbalanced force. The reluctance of the rotor-to-compensator magnetic flux path is substantially invariant with rotor position.
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公开(公告)号：US20150198668A1
公开(公告)日：2015-07-16
申请号：US14573573
申请日：2014-12-17
申请人： ROLLS-ROYCE PLC
IPC分类号： G01R31/34
CPC分类号： G01R31/343 , H02H7/065 , H02P9/00 , H02P9/102 , H02P11/00
摘要： A method for detecting a fault in an exciter circuit, suitable for use in a brushless generator, the exciter circuit including (a) an exciter armature winding, having a plurality of armatures, arranged to generate a multiphase AC signal, each armature of the plurality of armatures providing a respective sub-signal component of the multiphase AC signal, and (b) a rectifier circuit for receiving the sub-signals via the respective armatures, the rectifier circuit comprising a plurality of components arranged to rectify the sub-signals to provide a rectified output signal, wherein the method includes the steps of: acquiring a respective operational sub-value for a first characteristic of each of at least two of the respective sub-signals; deriving an operational value indicative of a relationship between the acquired respective operational sub-values; determining whether a fault has occurred in the exciter circuit on the basis of the derived operational value.
摘要翻译： 一种用于检测适用于无刷发电机的励磁电路中的故障的方法，所述励磁电路包括（a）具有多个电枢的励磁机电枢绕组，所述多个电枢布置成产生多相交流信号，所述多个电枢 提供多相AC信号的相应子信号分量的电枢，以及（b）用于经由相应电枢接收子信号的整流电路，整流电路包括多个组件，其被布置成整流子信号以提供 整流输出信号，其中所述方法包括以下步骤：获取相应子信号中的至少两个中的每一个的第一特性的相应运算子值; 导出指示所获取的各个操作子值之间的关系的操作值; 基于导出的操作值来确定励磁电路中是否发生故障。
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