時變電感 的英文怎麼說
中文拼音 [shíbiàndiàngǎn]
時變電感
英文
time varying inductance-
Being a method of time - domain electrical magnetic surveying, the transient electromagnetic method ( tem ) can transmit first pulse electromagnetic field to underground making use of loop or electrical source and receive secondary induction field during of the pulse intermission
瞬變電磁法是一種時間域電磁測量方法，是利用不接地回線或接地線源向地下發送一次脈沖磁場，在一次脈沖磁場的間歇期間，採用不接地線圈接收感應二次磁場。This paper discusses the characteristic of inductivity coupled plasm atomic excite spectroscope and applies the analysis method to measure the atmosphere corrosion rusty layer samples from qingdao and chengdu. we get the relative content of each element of rusty layer and show the charitable situation that the relative content varied with the change of corroded environment and time
概述了電感耦合等離子體光譜法的特點，並運用該光譜法對青島和成都兩地的大氣腐蝕銹層樣品進行了比較測試，得出了銹層中各元素的相對含量及其隨腐蝕環境和時間的變化情況Induced current electrical impedance tomography ( iceit ) is a new branch of electrical impedance tomography ( hit ). it applies several excitation coils on the boundary of the object. when one of the coils is stimulated by constant alternating current, the magnetic field is established
感應電流電阻抗斷層成像（ inducedcurrentelectricalimpedancetomography ， iceit ）是電阻抗斷層成像技術的一個分支，它在被測目標的外圍放置若干個激勵線圈，對其施加時變電流，在空間產生交變磁場，從而在被測目標內激勵出感應電流。Transitional feature of the arc and metal droplet in the welding process with steam shielded arc is investigated by means of analysing the waveforms of welding voltage and current under different welding regimes and it is found that there are two types of arc process behavor ? " arc starting - arc blowing out - short - circuiting " and " arc - starting - short - circuiting ". under the condition of constant diameter of welding wire and its feeding speed, the arc process behavor can be changed by adjusting the inductance of welding circuit as well as the voltage of power supply. if arc process behaves as alternative process of " arc starting - arc blowing out - short - circuiting " with minimum time duration of arc blowing out and maximum frequency of short - circuit transition, the welding process will be stable with less spatter and smooth weld bead
通過分析不同焊接規范下的焊接電壓和電流的波形.研究了水蒸氣保護下電弧及熔滴過渡的特點，發現其電弧過程行為有「燃弧?熄弧?短路」和「燃弧?短路」兩種形式.在焊絲直徑和送絲速度一定的情況下，通過調節焊接迴路中的電感量和電源電壓，可以改變電弧的過程行為形式.若電弧過程呈「燃弧?熄弧?短路」交替進行，並且熄弧時間最短時，短路過渡頻率最高，在這種情況下，飛濺小，焊道成型好，焊接過程穩定To explain this, we ' re going to avoid the idea of impedance ( which has resistive, capacitive and inductive components, some of which vary in effect by frequency, thus varying the actual loading ) and use pure resistance to describe the concept
為了便於解釋，我們準備暫時避免使用阻抗這一概念，因為它有電阻性、電容性和電感性成分，而其中一部分會隨著頻率的變化而變化，從而改變了實際的負載。The dual - loop control method adapted to current source is proposed - outer loop is the feedback of averaged load current and inner loop is that of inductor current
逆變電路採用了適用於穩流輸出的雙環控制方式：外環負載電流平均值反饋，內環電感電流瞬時值反饋。A novel parallel - serial type cttfc ( combined two - transistor forward converter ) with coupled inductor is present in this paper, and the performance of three parallel - serial type cttfcs is studied and compared. the performance of cttfc with coupled inductor is similar to the other two cttfcs while coupling coefficient is less than one and the converter working ccm ( continuous current mode ), and input - to - output voltage gain increase one times while coupling coefficient is one
本文提出了一種耦合電感並?串型雙管正激組合變換器，並對三種並?串型組合變換器的特性作了比較：耦合系數小於1且耦合線圈電流連續時，三種並?串型組合變換器特性相類似：耦合系數為1時，組合變換器輸入輸出電壓增益增大一倍。Three parallel - parallel type cttfcs is studied and compared in this paper. the performance of the cttfc with coupled inductor is similar to that with sharing freewheeling diode while coupling coefficient is one, and similar to that with sharing output capcitor while coupling coefficient is less than one and the converter working ccm
揭示了耦合電感並?並型雙管正激組合變換器與其餘兩種並?並型組合變換器的關系：耦合系數為1時，具有與共用續流管組合變換器相類似的特性；耦合系數小於1且耦合線圈電流連續時，具有與共用輸出濾波容組合變換器相一致的特性。At present, in studying and developing heavy capacities and parallel resonant inverter, it is expected to solve the problems of researching on simple structure and easy to start frequently series resonant inverter in the fields of domestic high frequency induction heating installation. therefore, researching of the subject is to design and study a high frequency ( more than 1 mhz ) and high power topological structures of full solid - state induction heating power supply
目前在研究和開發大容量的並聯逆變中頻電源的同時，研製結構簡單，易於頻繁起動的串聯逆變高頻電源是國內高頻感應裝置領域有待解決的問題，基於此種需要，本課題主要研究設計一種高頻（ 1mhz以上）大功率全固態感應加熱電源逆變電路的拓撲結構。According to the request of this subject, we have developed the system hardware and software for the slave device and the inspection software running on the pc. in this paper all of the followings is illustrated detailedly, such as the research on the principles of measurement and its realization, three means of water - level measurement that are separately based on photo electricity coder, pressure sensor and potentiometer ; selection of the microchip, we choose an advanced integrated soc ( system on chip ) microchip c8051f021 as the main controller ; realization of signal sampling, processing and its conversion in the mcu ; application of high precision 16 bits adc cmos chip - - ad7705 in our system, designing its interface with the microchip and relevant program ; using a trickle charge timekeeping chip ds1302 in the system which can provide time norm and designing of its i / o interface and program ; additionally, a 4 ~ 20ma current output channel to provide system check - up using ad421. in the system, ad421, ad7705 and the microchip compose spi bus ; to communicate with the master pc, here we use two ways which are separately rs232 and rs485 ; moreover, there are alarm unit, keyboard unit, power supply inspection unit and voltage norm providing unit in the system
針對研製任務的要求，課題期間研製了下位機系統硬體和軟體，開發了上位機監控軟體，其中所作的具體工作包括：測量原理的研究和在系統中的實現，在本次設計中用三種方法來進行水位測量，分別是旋轉編碼器法、液位壓力傳感器法和可變電阻器法；主控晶元的選擇，我們選用了高集成度的混合信號系統級晶元c8051f021 ；實現了信號的採集和處理，包括信號的轉換和在單片機內的運算；高集成度16位模數轉換晶元ad7705在系統中的應用，我們完成了它與單片機的介面設計及程序編制任務；精確時鐘晶元ds1302在系統中的應用，在此，我們實現了用單片機的i o口與ds1302的連接和在軟體中對時序的模擬，該晶元的應用給整臺儀器提供了時間基準，方便了儀器的使用；另外，針對研製任務的要求，還給系統加上了一路4 20ma模擬信號電流環的輸出電路來提供系統監測，該部分的實現是通過採用ad421晶元來完成的，本設計中完成了ad421與單片機的spi介面任務，協調了它與ad7705晶元和單片機共同構成的spi總線系統的關系，並完成了程序設計；與上位機的通信介面設計，該部分通過兩種方法實現： rs232通信方式和rs485通信方式；系統設計方面還包括報警電路設計、操作鍵盤設計、電源監控電路設計、電壓基準電路的設計。The resistance and leakage inductance of ten slots are calculated according to the calculation result of non - linear electromagnetic field of the induction machine with compound cage rotor
根據復合籠條轉子感應電動機一對極下的非線性時變場的求解結果，計算了10個槽的電阻和漏感。By compared with the simulation results and the experiment results, we come to the conclusions that : ( 1 ) circuit with assistant network can widen soft - switching extent in lagging arm, reduces duty - cycle loss on the secondary, diminishes switching dissipation of inverter spot - welding power source. ( 2 ) the range of resonant capacitor, the important factor to soft - switching process, not only affects zero - voltage turn - off of power switches, but also affects the range of zero - voltage turn - on of power switches. so resonant capacitors must be considered according to many aspects ; ( 3 ) it easily fulfils soft - switching condition in lagging arm as leakage inductance of power transformer increases, but bigger leakage inductance of power transformer increases opening dissipation of transformer and decreases efficiency of soft - switching inverter power source
通過模擬結果與軟開關點焊逆變器試驗結果的對比分析，得到了如下主要結論：採用輔助網路可以完全拓寬全橋軟開關逆變器的滯后橋臂軟開關范圍，減小了次級占空比丟失，降低了逆變電阻點焊電源的開關損耗；諧振電容是影響軟開關工作狀態的重要因素，其大小不僅影響開關管的零電壓關斷，同時也影響開關管的零電壓開通范圍，因此，諧振電容應該綜合考慮；功率變壓器漏感越大，越容易滿足滯后橋臂的軟開關條件，但是大的漏感也使變壓器的通態損耗增加，降低了軟開關逆變器的效率。To reduce the inductor and the phase displacement between the input current and the input voltage simultaneously, multi - level ( ml ) converters are adopted as the pfc topologies in this thesis
為了同時減小電感和輸入電流與輸入電壓間的相位差，本文提出採用多電平變換器作為pfc變換器的拓撲。The observer makes use of motor parameters to estimate speed, but these parameters ( stator and rotor resistance, magnetizing inductance ) will vary because of the change of environmental temperature, iron loss and main flux saturation. so parameter variation will lead to the error of estimation, the purpose of this paper is to study the influence and the compensation of parameter variation
因為觀測器在估計轉速時利用的是電機的額定參數，而電機的參數（定子電阻、轉子電阻、勵磁電感）由於環境溫度的變化、鐵心損耗和主磁飽和的影響將發生變化，所以必然有估計誤差產生。The electromagnetic field theory and the variation method is applied to found the 2d mathematics model during the process of starting of the induction machine with compound cage rotor. the dispersion, element analyse and collectivity composing of time - variation field are given
利用電磁場理論和變分法建立了復合籠條轉子感應電動機起動時二維電磁場的數學模型，給出了正弦時變場單元分析過程和離散格式以及最終的總體合成方程。In the second chapter, equivalent circuit of the eddy current sensor is firstly analyzed. based on that, the carrier signal generating circuit that is realized by the lc periodic circuit is introduced, thus, the carrier signal of standard frequency is obtained through the trimming capacity. subsequently, the disc type rotational armature generator and the rotational coupling transformer are separately leaded in to realize the power supplies of the carrier signal generating circuit and output of the measuring signal
在傳感器設計一章中，首先對渦流傳感器進行等效電路分析，在此基礎上分析了由電感、電容諧振電路構成的載波信號發生電路，並通過微調電容獲得了標準頻率的載波信號；接下來提出了採用盤式旋轉電樞發電機解決載波信號發生電路電源供給問題的方案，同時通過旋轉耦合變壓器的引入，使得測量信號輸出問題很好地解決；本章最後給出的一組實驗曲線充分說明了這一方案的可實現性。Through theoretic reckoning and simulating analyzing, several control strategies for shunt apf were compared and chose ip - iq arithmetic of the instantaneous reactive power theory control strategy as the right scheme to produce the instructing current. based on it, some new control arithmetic was subjoined to suppress the resonance in system and balance the dc side capacitor voltage. two topologies of main circuit were compared and chose the three - phase voltage - source converter with a split - capacitor as its main circuit structure
通過理論計算和模擬分析，比較了並聯型apf的幾種控制策略的優點和缺點，從中選擇瞬時無功理論控制策略i _ p - i _ q計算方式為指令電流產生的演算法，並在此基礎上增加了抑制系統諧振和平衡直流側電容電壓的控制；比較了並聯型apf主電路的兩種常見形式，從中選擇了三相電壓型變流器的主電路形式；算出適合該apf的直流側電容和出線電感的參數；設計出能有效消除apf產生的高次諧波的高通濾波器。The clamping diodes conduct only once in a switching period, and the resonant inductance current is smaller in zero state, leading to a higher efficiency and reduced duty cycle loss. the operation principle of the improved converter and the comparison with the original converter are analyzed in this paper. the effect of the blocking capacitor in series with the transformer or resonant inductance is discussed, and a best scheme is determined
本文將諧振電感和變壓器交換位置，使變壓器與滯后橋臂相連，這樣箝位二極體在一個開關周期中只導通一次，同時零狀態時諧振電感電流較小，有利於提高變換效率和減小占空比丟失，本文分析改進后變換器的工作原理，並與改進前的變換器進行對比，討論隔直電容在不同位置對變換器工作的影響，確定一種最佳工程方案。In order to improve the prospecting precision to the earth of transient electromagnetic method ( tem ), the idea of tem imaging is proposed according to the characteristics of both electromagnetic wave propagation and response : the wave - impedance is calculated from observed data in - field by the way of inverse - faltung and linear digital filter ; the sequence of reflection coefficients corresponding to every tiny - lever move time is calculated by the way of linear programming, and the imaging result section is drawn consequently
摘要?提高瞬變電磁法的對地探測精度，從瞬變電磁場的傳播特性和電磁響應特性兩個角度?慮，提出了瞬變電磁成像方法：由野外實測磁場感應數據，經過反褶積和線性數字濾波求出波阻抗；用線性規劃法求出每一微層走時所對應的反射系數序列，並以此?參數繪製成像結果圖。At first, buck - boost circuit is detailed analyzed and derived strictly in the theory, and on the base, the current of the inductance and the output voltage are analyzed elaborately. when the input voltage is the ac voltage with the nomal frequency, the two variable quantity are analyzed and some conclusions are concluded by means of equal length separation methods and introducing function methods and derivative - equation methods. and this is the basis of the next proceeding
首先，對buck - boost電路進行了嚴謹地理論推導，先對buck - boost電路在輸入為直流電壓時的工作情況進行了分析；在此基礎上，對輸入為工頻交流電壓時的電感電流、輸出電壓作了詳細分析，利用等間距離散化方法、引入函數法、微分方程法分別對變量進行了推導和總結，為下一步工作奠定了理論基礎。分享友人