And we can diagnose the condition of the rotating rectifier with harmonics amplitude 并以此為判據(jù)對旋轉整流器運行狀態(tài)進行判別。
Rotating rectifier brushless generators are one of the important solutions to modern isolated electrical power generating system 采用旋轉整流器式無刷交流發(fā)電機是現(xiàn)代獨立電源系統(tǒng)的重要方案之一。
Because of canceling slip rings and carbon brushes , it is impossible to measure directly the rotating rectifier ' s current and voltage . so , it is very difficult to monitor and protect the rotating rectifier 但是,取消了滑環(huán)和炭刷,旋轉整流器的電壓和電流不可能直接測量,使其監(jiān)視與保護十分困難。
As compared with the simple bp network , this diagnosis result is avoiding getting in local - minimum , more accurately and reliably . it also avoids the omitting and mistakes diagnosis of the rotating rectifier faults 與純bp神經(jīng)網(wǎng)絡相k腿免bp網(wǎng)絡漲陷入的局部極小,診斷結果更力dwh和可靠,有效防止了旋轉整流器故障的誤判和u 。
In brushless excitation system , rotating rectifier is likely to occur several faults . but there is not clear linearity relation between the cause of fault and corresponding symptom . and it is difficult to describe their relation with mathematics model 在無刷勵磁系統(tǒng)中旋轉整流器可能出現(xiàn)各種故障,但故障原因和相應的癥狀之間往往沒有明確的線性關系,也就很難距歷g洲精確的數(shù)學模型來描述。
Firstly , the voltage sample signals from ac exciter stator coil were de - noised and filtered by means of decomposition of the wavelet function . secondly , the character frequency region of the rotating rectifier fault was selected clearly with wavelet package decomposition and reconstruction 先對交流勵磁機定子磁極線圈電壓采樣信號進行消噪濾波,再通過小波包分解和重構進行特征頻率提取,建立了表征旋轉整流器故障的特征向量。
Wavelet theory has the special ability to express the signal local characters in the time and frequency region . in this paper , the signals of rotating rectifier normal or fault conditions have been analyzed by wavelet transform , and the eigenvector , which includes useful information , has been obtained 小波理論在時域和頻域同時具有良好的表征信號局部特征的能力,本文采用小波變換來對各種故障情況下的信號進行分析,提取含有豐富的故障信息作為特征向量。
This paper theoretically analyses the armature current and magnetomotive force in ac exciter of brushless synchronous machine with rotating rectifier . under the normal or fault conditions of rotating rectifier , the mathematical expressions of the armature current , the m . m . f and induced electromotive force are approached 本文通過對旋轉整流器在正常與故障狀態(tài)下的交流勵磁機電樞電流和電樞電勢作了初步的理論分析,推導出旋轉整流器在正常與故障狀態(tài)下電樞電流、空間諧波合成磁勢及其感應電勢的數(shù)學表達式。