換向磁場 的英文怎麼說
中文拼音 [huànxiàngcíchǎng]
換向磁場
英文
commutating field-
We studied the influence of the interface strain and it shows that the lattice mismatch between substrate and film is the main reason of the above observations. expand strain decreases tm - i with increasing resistivity and compressed strain has the opposite effect. using double exchange model of zener these results can be explained qualitatively
27歐姆厘米，轉變溫度是78與154開爾文，磁場強度為7t時，磁阻率為習3及巧6 x結合雙交換模型和不同的應力作用，逐一解釋了產生差異的緣由，其中我們也討論了具有）取向的la 。From the investigation on the effects of exchange anisotropy, we can see that exchange anisotropy exert a strong effect to the order in the system. under the weak external magnetic field, the formed long - distance order in the system relate to both the external magnetic field and exchange anisotropy
在交換各向異性對體系的影響的研究中，我們可以看到交換各向異性對系統中序的形成有著強烈的影響：體系在比較弱的外磁場下，形成的長程序不僅和外磁場有關，還強烈的依賴于交換各向異性。We think that the indirect exchange is in relation to the magnetic field, and gain the coefficient relevant to the applied field. the result calculated using the coefficient is in good agreement with the experimental result. that also further perfects the theory of the microscopic mechanism of leading to the anisotropy of ergag
研究認為間接交換作用的大小與外磁場的大小有關，得到了和外磁場有關的系數，由此計算的磁化強度特性曲線與實驗值符合情況有所改善，進一步完善了導致ergag磁性各向異性產生的微觀機制。The bias magnetic field of the bias coil driven by bias current and small signal test current, results in the induced signal of the control coil. the terminal voltage of the control coil is detected by the test circuit. then the signal containing the information of rotor displacement is obtained, from which we can get the dc voltage signal proportional to the rotor displacement through half - wave rectification circuit and low pass circuit. this dc signal is put into a pid controller to get the control signal of the rotor displacement
偏置測試電路向偏置線圈輸入偏置電流和小信號測試電流，兩者產生的偏置磁場在控制線圈產生感應信號，檢測電路檢測控制線圈端電壓並提取含有轉子位移信息的電壓信號，該信號經半波整流電路和低通濾波電路后得到與轉子位移成正比例的直流信號，再由pid控制器轉換為轉子位移的控制信號，最後控制信號輸入功放電路產生控制電流，實現閉環控制。The explaining for region gravity and magnetic data is accomplished by using result of potency field transformation through level and vertical relating with level one - difference of several height and vertical two - difference and working out construct map of region geophysics
對區域重磁資料的解釋就是利用位場變換結果，是通過不同延拓高度的水平一階導數、垂向二階導數圖的解釋，再進行水平和垂向關聯，編制區域物探構造圖的方式實現。Study on field - oriented control of a doubly - fed electric machine fed by matrix converter
矩陣式變換器勵磁的雙饋電機磁場定向控制研究Company is specialized in producing more than twenty series and 200 specifications, such as stop valve, ball valve, electrical magnetic valve, one - way valve, distributor, guiding pipe, filter, accumulator, motor. all of the products are of good quality and are adopted by many famous air - conditioner companies : haier, midea, gree, shinco, fedders xinle, hualing, hitachi, yuetu and so on. some products have been exported to usa, middle east, italy, spain and southeast of asia and are warmly welcomed by the customers
公司專業生產空調用截止閥電磁閥電控板四通換向閥球閥單向閥分流器引管儲液筒過濾器電機等二十多個系列200多個品種，產品符合各項技術指標，性能卓越質量穩定可靠，為國內著名的海爾美的奧柯瑪格力新科飛達仕新樂華凌日立月兔等空調企業配套，部份產品已進入美國中東義大利西班牙和東南亞等國際市場，頗受用戶青睞。The main achievements are as follows : the theory models of defect mfl field are set up ; based on the magnetic dipole model and finite element model, the distribution of defect mfl field is simulated in the dissertation ; the component of flux density ( magnetic filed ) parallel to the surface of pipe is detected by a circumferential array of hall probes ; the factors including defect geometry parameters, defect surface angle and shape, pipe material, field intensity, vehicle velocity, background magnetization, operating pressure and remanent magnetization and so on influence the mfl signal characteristics
採用霍爾元件作為缺陷漏磁檢測傳感器，獲得管道軸截面漏磁場切向分量的漏磁信號；研究了缺陷外形尺寸、缺陷傾角和形狀、管道材質和磁化強度、檢測儀移動速度、管道背底磁場、管內壓力和剩磁對漏磁信號的影響。提出了各通道增益放大、各路漏磁信號偏離調整、波形微分、數字濾波和平滑等漏磁信號預處理方法；分析了等空間采樣的漏磁信號轉換為等時間采樣信號的必要性，研究了漏磁信號的小波去噪方法。One can also imagine changing the orientation of the source or drain with a magnetic field, introducing an additional type of control that is not possible with a conventional fet : logic gates whose functions can be changed on the fly
想像一下，如果可以利用磁場來改變源極與汲極的磁性方向，這就等於引進了一種新的控制方法，可以製造出運作時能切換功能的邏輯閘，這是傳統fet辦不到的。Taking core loss into account has important effect to improve the torque performance of the motors " field oriented control. in this paper, the transient mathematical model of the asynchronous motor with core loss is setup. the method is proposed that minimizes the loss in a variable speed and torque at the synchronous rotating coordinate
在對損耗分析的基礎上，建立了考慮鐵損時異步電機的動態數學模型，推導出在同步旋轉坐標系下變速、變轉矩時使電機功率損耗最小的方法，並且結合矢量變換提出了基於快速轉子磁場定向的矢量控制。It ' s a novel inductive electrical power deliver that deliver power from stillness apparatus to moving electrical apparatus. this technology is based on power electronics and electromagnetic induction, and realized by applying modern control theory
該技術利用現代電力電子能量變換技術、磁場耦合技術，藉助于現代控制理論和手段實現能量從靜止設備向可運動設備的傳輸。But, the alarm signals from scada have disadvantages as follows : ( 1 ) the open - air feeder terminal units ( ftu ) are interfered by strong electromagnetic and thunder. besides, the failure of relays and the fault of ftu can also lead to that fault information is interfered and aberrant. ( 2 ) in the process of transmission and commutation, the error in the communication equipment may result in the signals err or lose
然而，現有的scada系統在配電網發生故障時提供給調度員的警報信息有如下局限性： （ 1 ）面向現場的戶外饋線終端ftu運行環境惡劣，承受強的電磁、雷電干擾，並且由於繼電器節點故障、 ftu元器件損壞等因素的存在，使得配電網信息受干擾、畸變的可能性較高； （ 2 ）在信號傳輸及變換過程中，通訊裝置的故障等原因，也可能導致信號出錯甚至丟失； （ 3 ）保護裝置和斷路器本身也有可能誤動或拒動。In engineering, vector control ( vc ) is called as filed orientation control ( foc ). the principle of foc is to divide stator current into two dc components. one of them is oriented to the rotor magnetic flux, another is oriented to the torque. the operating process can be carried out by transforming coordinate in magnitude flux and torque keeping consistent conditions
矢量控制一般稱為磁場定向控制，該控制理論的原理是在轉子磁通和轉矩保持不變的情況下通過坐標變換將異步電機的定子電流分解為按轉子磁場定向的兩個分量分別進行控制，從而實現轉子磁通和轉矩的解耦。These are the main results : firstly, on point of the energy exchange in mechanic - electronics, relations among magnetic energy, torque and radial force of pmb are found out
主要研究工作如下：首先，從機電能量轉換的角度出發，推出了動力磁軸承磁場能量與電磁轉矩及徑向懸浮力的關系。Beginning with the equivalence principal, two types of near - field to far - field ( nfff ) transformation s are discussed systematically, i. e. frequency - domain nfff ( fd - nfff ) and time - domain nfff ( td - nfff ). in td - nfff transformation, the concurrent - processing approach is used, where the contributions to far - field from the tangential electric current and magnetic current on the equivalence surface are calculated " on - the - fly " in step with the fdtd simulation. as a result, it is not necessary to store the tangential current components for every equivalence surface at every time step, and therefore reduce considerably computer storage required for the td - nfff transformation
在理論部分，本文從電磁場的等效原理出發，系統、詳盡地論述了頻域和時域近遠場變換的基本思想，在時域近遠場變換中採用實時的變換方法，即每進行一個時間步的迭代，就計算一次等效面上該時間步的切向電流和切向磁流對遠場各方向的貢獻，這樣就使時域近遠場變換不需要儲存等效面上每一個時間步的切向電流和切向磁流，大大減小由於近遠場變換而增加的計算機內存需要量。Matrix converters have received considerable attention in recent years, but the study focus is on matrix converter per se. a combined control strategy for matrix converter fed induction motor drive system is proposed, which implements both space vector modulation of matrix converter and direct field oriented control of induction motor
摘要提出了一種適用於矩陣變換器供電的異步電動機調速系統的組合控制策略，同時實現了矩陣式變換器的空間矢量調制和異步電動機的定子磁場定向直接轉矩控制。Combined with the advantages of matrix converter, ac - excited generation technique and vector control scheme, the stator flux - oriented vector control model of the variable - speed constant - frequency ( vs cf ) ac - excited generator fed by a matrix converter was developed. simulation studies of the proposed power generation system were carried out
本文還結合了矩陣式變換器、交流勵磁發電技術和矢量控制的優點，建立了矩陣式變換器供電的變速恆頻交流勵磁風力發電機定子磁場定向的矢量變換控制系統模型，對矩陣式變換器在交流勵磁發電系統中應用進行了模擬研究。分享友人