未勵磁的 的英文怎麼說
中文拼音 [wèilìcíde]
未勵磁的
英文
unexcited-
Thus, it is difficult to find the voltage reference for the harmonic analysis. since acem are always operated near to the synchronous speed, the frequency of the excited voltage is very low, even to zero. therefore, this is the power harmonic suppression study of a complicated power supply system, in which the about harmonic general theories and methods are all inapplicable
現代交流勵磁電機（ acem ）採用電力電子變流器作為勵磁裝置，其勵磁電壓諧波含量豐富，難于獲得諧波分析所需的電壓基準，同時交流勵磁電機經常工作在同步轉速附近，致使勵磁電壓頻率極低甚至為直流，通常的諧波檢測方法和理論都無法適用，因而這是一種目前尚未深入探討過的復雜供用電系統電力諧波抑制問題的研究。Then the solving procedures of these bies by the rwg functions based moment method are elaborated, and the method of modeling complex objects built of arbitrary line, surface and volume structures is developed. in order to solve realize antenna and circuit problems, methods of adding excitations and concentrated loadings with moment method are deceloped, and matrix pencil ( mp ) method is used to deembeded the s prameters of antennas and circuits from the computed current distribution. some numerical results of practical complex antenna and scattering problems are presented to illustrate the veracity and effectiveness of the method
在第一部分中，首先從電磁場的基本理論出發，基於等效原理和邊界條件以統一的方法建立了用於分析金屬、介質及金屬與介質混合結構的邊界積分方程，並歸納和比較了各類積分的適用范圍和優缺點;在此基礎上，給出了使用基於rwg函數的矩量法求解各種邊界積分方程的一般過程;研究了具有任意線、面、體組成的復雜結構的電磁建模方法，並給出了各種多面連接情況下基函數和未知量的選取方法;研究了使用矩量法分析電路、天線問題時集總元件和激勵源的處理方法，並基於矩陣束方法（ matrixpencilmethod ）提取了電路和天線問題的s參數;最後通過分析一些工程中的復雜金屬天線問題和具有「金屬與介質混合結構」的散射和天線問題驗證了方法的準確性和高效性。But the problems in the control system of excitation device such as its robustness, fast response and efficiency are still not well resolved
然而勵磁系統控制中的魯棒性、快速性和有效性問題卻一直未曾得到很好的解決。The analysis and research of the starting and running of the synchromotors iii many large pumping stations and the working condition of excitation system have indicated that the causes leading to damage to the motor or difficulties in starting are relevant to the poor technical characteristics of the equipped excitation system, especially resulting from the frequent restarting after failure to start the motors and the failure to protect or protect the synchromotors improperly in the fall - out
通過對大泵站同步電機起動、運行及勵磁裝置工作狀況的分析和研究，結果表明：導致同步電機損壞及起動困難的原因與電機所配勵磁裝置保護技術性能不完善有關；特別是先期起動失敗后再多次頻繁起動及運行失步時未起保護作用或保護不到位造成。分享友人