直流轉換比 的英文怎麼說

中文拼音 [zhíliúzhuǎnhuànbǐ]
直流轉換比 英文
dc transfer ratio
  • 直 : Ⅰ形容詞1 （成直線的; 硬挺的） straight; stiff 2 （跟地面垂直的; 從上到下的; 從前到后的） erect; v...
  • 流 : Ⅰ動1 （液體移動; 流動） flow 2 （移動不定） drift; move; wander 3 （流傳; 傳播） spread 4 （向壞...
  • 轉 : 轉構詞成分。
  • 換 : 動詞1. （給人東西同時從他那裡取得別的東西） exchange; barter; trade 2. （變換; 更換） change 3. （兌換） exchange; cash
  • 比 : Ⅰ動詞1 （比較; 較量高下、 長短、距離、好壞等） compare; compete; contrast; match; emulate 2 （比...
  • 直流 : direct current （dc）; constant current; steady current; continuous current; zero frequency curre...
  • 轉換 : change; transform; convert; switch
  1. Design engineers now selecting pmbldc motors over conventional dc or induction motor drives for the following reasons : 1 ) the absence of brushes results in an essentially maintenance free operation and eliminates the undesirable effects of commutation such as sparks, brush - loss, radio - frequency interference, etc. 2 ) the low inertia of the rotor enhances the quality of the mechanical response of the motor, shortening the acceleration and deceleration time. 3 ) utilizing rare - earth permanent magnet materials with high coercive force results in substantially higher efficiency than their counterpart with brushes of the same size. 4 ) because of the absence of commutation segments, the stator construction is simple

    現在的工程師們更為青睞永磁無刷直流電動機是因為以下幾點原因： （ 1 ）去除了電刷的永磁無刷直流電動機徹底地免除了維護而且消除了我們不希望的由於換向帶來的火花、電刷損耗以及無線電干擾等等； （ 2 ）低轉動慣量的轉子提高了電機機械響應的質量，從而縮短了電機加速和減速的時間； （ 3 ）高矯頑力稀土永磁材料的使用使得同樣尺寸的永磁無刷直流電動機比傳統的直流電動機效率高； （ 4 ）由於沒有機械換向部分定子的結構簡單了。
  2. 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。
  3. The theory of fdi holds that the developing host country can draw advanced technology and capital which its country lacks. utilizing international circulating resources can help our industry to stride across the bottleneck of the supply of the key element, to establish rapidly the industry which cannot be developed at the present, promote " the upgrading of the old industries of the host country, enhance the quality of the related industries " capital, transfer the comparatively inferior industry to the comparatively superior industry, to accelerate the u pgrading of the industrial structure. however, the effect of fdi on promoting the upgrading of the host country ' s industrial structure is decided by the height of the industrial development of the emigrating country, the industrial accepting ability of the host country and the industrial leading " ability formed by fdi ' s related effect

    外商直接投資理論認為通過引入外商直接投資，發展中東道國可以引入本國缺乏的先進技術和資本，利用國際流動資源幫助本國產業跨越原要素供給的瓶頸，迅速建立起現階段自身沒有能力發展的產業，推動東道國原產業的升級換代，提高東道國關聯產業存量資本和新形成資本的質量，使相對比較劣勢的產業向比較優勢的產業轉化，加速本國產業結構升級。但是外商直接投資促進東道國產業結構升級效應的高低則決定於產業轉移國的產業發展高度，東道國的產業接受能力和通過外商直接投資關聯效應形成產業帶動的能力。
  4. Firstly, this paper introduces the asynchronous motor model, and compares it with the dc motor ’ s. then the paper studies the principle of vector control, and proposes an improved current model of rotor flux observer. this paper also studies the three - level inverter ’ s topology, working principle, the neutral - potential unbalance mechanism and its controlling strategy. the paper especially studies the svpwm in details. the interface between the vector control and the three - level inverter is studied in details, including the generation of reference voltage vector, its judging of the sector and triangular regions, and the working mechanism after it sent into three - level inverter. when synthesizing the reference voltage vector, select the vector which only includes p and o states as the starting vector, thus eliminate the vector shift problem when sector changes. this paper fully takes advantages of the powerful functions of matlab / simulink to set up the simulation model. this construction is very explicit. the simulation results verify the inverter voltage output is correct, the rotor flux is steady, the asynchronous motor ’ s dynamic and steady state performances and speed modulation are excellent

    本文首先介紹了異步電機的數學模型，在此基礎上將異步電機的數學模型與直流電機的數學模型進行了比較;然後介紹了矢量控制的基本原理，採用了一種改進的轉子磁鏈電流型觀測模型;對三電平逆變器的電路拓撲、工作原理、中點電位不平衡的機理及控制方法進行了介紹，詳細分析了空間矢量脈寬調制策略。本文對異步電機的矢量控制與三電平逆變器之間的介面進行了詳細的研究，包括:參考電壓矢量的形成、所落扇區與具體小三角形區域的判斷、送入逆變器之後的工作機理。在參考電壓矢量的合成時，選擇只包含p 、 o狀態的空間電壓矢量作為起始矢量，解決了扇區切換時的矢量突變問題。
  5. Ac - dc transfer instruments will be calibrated by comparison with the laboratory standards, which cover the range 0. 25 v to 1000 v and 40 hz to 1 mhz

    交直流轉換器的校正是透過與本所的標準（由0 . 25v至1000v及40hz至1mhz ）對比進行。
  6. Abstract in this paper the phase commutation and current curves of brushless motor variable - speed system are studied. according to the results that the pulsating torque is influenced greatly by the ratio of the direct current supply voltage and the electromotive force of the motor, an approach to reduce the pulsating torque is presented

    本文通過對無換向器電動機模型的換相過程和電流波形的研究，得到換相轉矩波動受直流電源電壓和電動機電動勢幅值的比（ u / e ）的影響較大的結論並獲取了最佳u / e ，同時通過模擬研究了電流波形，提出了減小轉矩脈動的控制策略。
  7. The sensing for rotor flux position of bldc motor is the key of commutation, so this paper expatiates on three different methods to sense rotor flux position and compares their advantage and disadvantage

    因為無位置傳感器直流無刷電機的轉子位置檢測是其準確換向的關鍵所在，所以本文對幾種不同的轉子位置檢測方法進行了闡述，並比較了其優缺點，希望能有一點借鑒的意義。
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