扇形突變 的英文怎麼說
中文拼音 [shānxíngtūbiàn]
扇形突變
英文
secter mutation- 扇 : 扇動詞1 （搖動扇子等使空氣流動） fan 2 （用手掌打） strike with the palm of the hand; slap 3 （鳥...
- 突 : Ⅰ動詞1 （猛沖） dash forward; shoot out 2 （高於周圍） protrude; bulgeⅡ副詞（突然） abruptly; sud...
- 扇形 : 1 （扇子的形狀）fan shaped:扇形窗戶fan shaped window; 他把牌在手上展成扇形。 he fanned out the ca...
- 突變 : 1 （突然急劇的變化） sudden change; change suddenly; transilience; accident; saltation; revulsion...
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Ten minutes had elapsed since the nurse had left ; valentine, who for the last hour had been suffering from the fever which returned nightly, incapable of controlling her ideas, was forced to yield to the excitement which exhausted itself in producing and reproducing a succession and recurrence of the same fancies and images. the night - lamp threw out countless rays, each resolving itself into some strange form to her disordered imagination, when suddenly by its flickering light valentine thought she saw the door of her library, which was in the recess by the chimney - piece, open slowly, though she in vain listened for the sound of the hinges on which it turned
護士離開已六十分鐘了那每夜必來的寒冷襲擊瓦朗蒂娜又快一個小時了，她無法控制自己的意志，那些幻景和虛象，那盞孤燈射出無數的光線，每一條光線都在她那混亂的幻想變成某種奇特的形狀，突然地，在那搖動的燈光下，瓦朗蒂娜好象看見壁爐旁邊凹進去的那扇通她書房的門慢慢地開了，但她卻聽不到門鏈轉動的聲音。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。
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