電勢矢量 的英文怎麼說
中文拼音 [diànshìshǐliáng]
電勢矢量
英文
potential vector-
For the bldcm which has a pseudo - sinusoidal back - emf waveform, this dissertation presents a svpwm control method using six discrete position signals for minimizing the torque ripple. the main aspects for the implementation of this method are analyzed, including the initial orientation of the voltage vector, reasonable choice of the impedance angle and the advance commutation angle, and estimation of the successive rotor positions
針對反電動勢類似正弦的準正弦波反電動勢無刷直流電動機，本文提出一種基於六個離散位置信號的自同步svpwm （電壓空間矢量法）控制方法，用以削弱電磁轉矩脈動，分析了實現這種方法的主要控制環節，包括起動時電壓空間矢量的初始定位，阻抗角與電流超前角的合理選擇以及連續轉子位置的估計等。In this article, introduce the important meanings of a - b effect, first is a have physics factors, second is wave function phase factor is connected with geometrical factor in ( b = 0, a 0 ), through a - b effect, we know : electromagnetic field vector e, b is local quantity, electromagnetic potential a, is global quantity, adding a, description and by the way of loop integral, electromagnetic field " effect is completely descripted
本文介紹了有重要歷史意義的a - b效應， a - b效應揭示了兩點物理觀念的變革：一是電磁矢勢有物理效應。二是在無場強但有磁矢勢（ b = 0 ， a 0 ）的區域，波函數的相位因子與其運動空間結構有關。 a - b效應顯示； e 、 b是局域量， a 、是總體量，只有加入a 、之後的描述，並通過a的環路積分，才能對電磁場的作用做出完全準確的描述。The vector magnetic potential of a system consisting a line electric current and an infinite long magnetic dielectric column is calculated with the method of separation of variables and method of images, it is pionted out that the vector magnetic potential of a system consisting a line electric current and a magnetic dielectric plane, an ideal paramagnetic column, a superconductor column, and a line electric current in homogeneous magnetic field can all be deduced from our calculation
摘要用鏡象電流法和分離變量法計算了線電流與無限長磁介質圓柱系統的磁矢勢，指出線電流與無限大磁介質分界平面、線電流與超導體圓柱、均勻外磁場中有磁介質圓柱系統時的磁矢勢都可以由線電流與磁介質圓柱系統的磁矢勢的極限情形給出。Adopting rotor field - oriented vector control methods, through which make the stator and the rotor magnetmotive forces can be kept orthogonal all along during operation of the bldcm, combining hysteresis current modulation ' s current control advantage and space voltage vector modulation ' s torque ripple attenuation advantage, then designing a sort of bldcm hysteresis current svpwm control method
摘要研究採用轉子磁場定向的矢量控制方法使無刷直流電動機定、轉子磁勢矢量始終保持正交，結合滯環調制電流控制和空間電壓矢量調制，設計了無刷直流電動機滯環電流svpwm控制方案。For the bldcm which has a neither sinusoidal nor trapezoidal back - emf, that is, for a general shape back - emf bldcm, this dissertation proposes a novel id = 0 vector control method. by this method, the iq for a constant torque to produce is calculated through coordinate transformation, and the reference iq is tracked by vector control in the dq0 frame
對于實際反電動勢波形既非正弦又非梯形波的無刷直流電動機，提出一種新型的任意波形反電動勢無刷直流電動機的i _ d = 0矢量控制方法，通過坐標變換浙江大學博士學位佑文摘要求解產生恆定電磁轉矩所需的q軸電流，並在dqo坐標系下通過矢量控制對q軸參考電流進行跟蹤。In this paper, first, the study of the distribution of electromagnetic field, energy, power, reflection coefficient and transmission coefficient in waveguide with piecewise different dielectric constants are studied. then, the behavior of propagation of am signal and gauss pulse signal through the waveguide are simulated by magic code ， and the plots of electromagnetic field, energy, ponyting vector and their spectrums at different time and different position are obtained. and, the group velocity and energy velocity of wave packet through barrier are calculated
從90年代開始， emig和martin 、 landauer等人研究了分段填充不同介質的波導中的電磁脈沖的傳播。在本論文中，作者首先推導出分段填充不同介質的波導中的電磁場分佈、能量、傳輸功率以及反射系數和傳輸系數的表達式，然後，採用magic程序模擬了這種波導結構中電磁波的傳播情況，得到了在不同時刻和不同位置處的電磁場分布圖、能量圖、坡印廷矢量圖以及它們的頻譜圖，並由模擬結果計算了波包穿越勢壘的群速和能量速度。Besides, successfully calculating the electromagnetic four - potential in the spacetime of charged black hole expressed by the generali zed spherical coordinate and furtherly solving the h - j equation of such spacetime make it possible to get the exact description of the energy extent of nonthermal radiation particle and to study the characteristics of such black hole ' s nonthermal radiation
另外，本文還求出了一類用扁橢球坐標表示的荷電黑洞時空中的電磁四維勢矢量，從而成功地求解了此類彎曲時空中的hh方程，得到了這種非熱輻射粒子能量范圍的精確表達式，從而對這類黑洞的非熱輻射特徵進行了研究。Abstract : first, the key magnet statuses and their pertinent mmf. position of exterior rotor brushless dc motor are described in this paper. second, the air - gap magnetic field and the armature reaction of the three - phase six - step exterior rotor brushless dc motor used in electrical bicycle are analyzed by means of mmf. vector, mmf. integration and magnetic field fem respectively. some valuable conclu - sions for designing this kind of motor are obtained
文摘:給出了外轉子無刷直流電動機的典型磁狀態及其對應的磁勢矢量位置，並用磁勢矢量合成法、磁勢積分法及電磁場的有限元方法對電動自行車用三相六狀態外轉子無刷直流電動機的氣隙磁場及電樞反應進行了詳盡的分析，從而得到有益於該種電機設計的結論。In industrial production, cycloconverter - feed synchronous motor vector control system has already been developed to be a certain trend of large rolling mill main drive. but its harmonic problem can not be ignored when running this system
在工業生產中，交-交變頻同步電機矢量控制系統已經成為大型軋鋼機主傳動發展的必然趨勢，但該系統運行時注入電網的諧波問題不容忽視。The background of rapidly developed uhsm ( ultra high speed machining ) technology is introduced and the key function of the uhs ( ultra high speed ) motorized spindle to uhsm is discussed in the thesis. after analyzing international technology status and trend of the uhs motorized spindle study, we research the core technologies related to the uhs motorized spindle in detail, such as optimized design of the motorized spindle structure, high speed bearing technologies, oil - gas lubication technologies, precision machining and assembly technologies, design and manufacture technologies of the built - in frameless motor etc. then the digital simulation of the motorized spindle sensor - less vector control system is studied thoroughly
本文從超高速加工技術飛速發展的背景出發，討論了超高速電主軸對超高速加工技術發展的重要作用和意義；分析了超高速電主軸研究的國內外現狀及發展趨勢；詳細論述了超高速電主軸的關鍵技術，包括電主軸結構優化設計、高速軸承技術、油氣潤滑技術、精密加工與精密裝配技術以及內裝式電機設計製造技術等，並深入研究了超高速電主軸無速度傳感器矢量控制系統的數字模擬技術。In order to decrease the harmonics in mc ' s input and output current, the svm method and sinusoidal hysteretic band method are introduced into the mc hysteretic control respectively. secondly, based on the predictive current control fundamental principle, the particular 27 vectors predictive current control strategy and current trend predictive control strategy are proposed. the simulation indicates that all of the current methods can improve the mc ' s output current quality and speed its dynastic response
提出了矩陣變換器的滯環電流控制策略，並針對滯環控制時輸入電流和輸出電流的諧波，分別提出了輸入電流空間矢量合成滯環控制方法和正弦環寬滯環控制方法；引入了矩陣變換器的預測電流控制新思路，在此基礎上，提出了矩陣變換器獨特的27矢量預測電流控制方法和趨勢型預測電流控制方法，模擬結果表明，各種電流控制方法提高了變換器的輸出電流品質，加快了變換器的動態響應性能。分享友人