逆正弦 的英文怎麼說

中文拼音 [zhēngxián]
逆正弦 英文
arc sine
  • : Ⅰ形容詞1 (方向相反) contrary; counter 2 [數學] inverse; converse Ⅱ動詞1 (抵觸; 不順從) go aga...
  • : 正名詞(正月) the first month of the lunar year; the first moon
  1. Digital pwm techniques for sine inverter power

    變電源的數字脈寬調制技術
  2. Experimental results certify that the proposed flyback inverter features small thd in the output sinusoid voltage, small size, light weight and fast dynamic response

    研製的100va原理樣機實驗結果表明,該變電路輸出電壓失真度小,體積小,輸出動態及靜態性能良好。
  3. 1 m 0. 5, the phase - shifted angle 6 is controlled in term of sine law which makes the magnitude of resonant voltage track a reference sine voltage, and the resonant voltage is rectified, filtered, inverted and then the better sine - voltage output is obtained, theoretical analysis and experimental results show that for the resistive load and inductive load, the switches of leading leg of the phase - shift - controlled circuit are always turned on at zvs, and ones of lagging leg are turned on at zvs ( < 0 ) or turned off at zcs ( ( > 0 ), moreover, all switches in the low - frequency inverter are always turned on and off at zvs, the measured circuit efficiency for rated load reaches up to 88 %

    從功率單向流動角度出發,提出了一種lcc諧振型恆頻移相單相高頻鏈變電路拓撲,在調制系數0 . 1 m 0 . 5情況下,控制移相角按規律變化,使諧振電壓脈沖列的幅值追蹤參考電壓信號,經過整流、濾波、低頻變,從而獲得度較好的輸出電壓。理論分析和實驗結果證明對于阻性負載或阻感性負載,移相全橋具有超前橋臂零電壓開通,滯后橋臂或者零電壓開通( _ 0 )或者零電流關斷( _ 0 )的軟開關特性,而低頻變器的各個開關均實現零電壓條件下的開通與關斷。
  4. There are five parts are as follows : in part one, the concept of switching function is introduced first to establish the nonlinear mathematical model of the induction motor variable frequency speed adjustment system which is fed by a sine pulse width modulated ( spwm ) inverter and takes the effect of the main magnetic circuit saturation into consideration, then the low frequency oscillation of the system is simulated according to the model. next, from the view point of energy conversion of the inverter - induction system, a criterion for the low frequency oscillation is proposed to determine whether the system is in low frequency oscillation which is judged by whether the interval of the negative current component of the inverter input current is more than 1 / fc ( fc is the carrier wave frequency of the inverter ) or not

    首先引入開關函數概念,建立了脈寬調制( spwm )變器供電異步電動機,考慮主磁路飽和時的變頻調速系統整體數學模型,模擬系統的低頻振蕩;其次從變器-異步電動機系統能量轉換角度出發,提出通過檢測變器輸入電流中負電流的間隔時間是否大於1 / f _ c ( f _ c為變器載波頻率)來判定系統是否出現低頻振蕩;最後的實驗結果驗證了系統低頻振蕩建模和判據的實用性和確性。
  5. The conventional converter has two power transfer levels. the first one is to obtain high frequency, and the second one is to obtain low frequency ac voltage

    傳統的電路結構中一般使用兩次變器,一次是為了獲得高頻,以便利用高頻變壓器進行變壓和隔離,第二次是為了獲得工頻交流電壓。
  6. This digital amplifier made up of a digital inverter can implement the sine voltage signal ' s power amplifying based on the digital signal processor. with the high processing ability of dsp, the advanced digital control arithmetic can be realized in the software. also the feasible and effective technique for the time delay compensation of digital control can be achieved

    該放大系統用數字化變器來實現電力系統電壓信號功率的放大,利用dsp數字處理器高速的處理能力,可以使系統實現高性能的演算法控制,並且能靈活地對系統的誤差進行補償,從而實現變系統的高性能和高精度,為解決電力系統電容式互感器二次側帶負載能力弱的問題進行了有意義的研究。
  7. The standard sine waveform is generated by looking up the sine table, and the triangular carrier waveform is produced by a reversible counter

    Spwm信號的產生採用波與三角載波比較的方法,標準波採用查表法實現,三角載波用可計數器實現。
  8. This paper put forward a method of using amending sine value in the spwm sine table. this method can correct the distortion of the output voltage waveform, which resulted from the dead time used to the voltage type whole bridge main circuit. the inverter system adopts digital fuzzy controller with feed forward correction and which proportion coefficient and integral coefficient is changeable, so dynamic response is improved

    本文提出了一種採用修補spwm表值的方法,用以改善電壓型全橋變主電路因上下橋的功率器件切換時先關斷后導通的死區時間而引起的輸出電壓波形畸變;變系統採用帶前饋校的變比例變積分系數的模糊控制器,提高了系統的動態響應指標;系統設計了完善的保護措施,並具有市電電網的故障診斷功能。
  9. In order to avoid the current ripple and the high switch frequency of fixed - band hysteresis current controllers, two hysteresis controllers of change hystersis - band are proposed. one is the sinusoidal - band hysteresis current controller, the other is the adaptive hysteresis current controller based on fuzzy theory

    由於常規的滯環電流控制器不能有效地防止負載電流脈動,並且存在著容易導致變器的開關器件的開關頻率過高的問題,論文提出了兩種變環寬滯環電流控制器結構,其一是環寬滯環電流控制器,其二是模糊變環寬滯環電流控制器。
  10. A system with repmsm ( rare earth permanent magnet synchro - nous motor ) as executing motor is presented in this thesis. the hardware platform for the ac speed regulating system is based on tms320f240 dsp controller and uses ipm ( intelligent power model ) as the power device in the invert circuit

    系統選用波永磁同步電動機為執行電機,以ti公司的tms320f240dsp晶元為控制核心,以智能功率模塊( ipm )為變電路功率開關器件,構成交流調速系統的硬體平臺。
  11. These topologies of inverters are composed of two bi - boost dc / dc converters, they are symmetry. so whole circuit turn into four - quadrant converters, we can control every power mosfet on or off. then we can get sine wave with direct current polarization at the left, at the same we also can get sine wave with direct current polarization phase contrast 180 compared of the left at the right

    這類變器由左右二個雙向boostdc / dc變換器構成,左右二邊是對稱的,所以整個電路構成了一個四象限變換器,我們可以恰當控制各功率管的開、關,使左邊的兩象限dc / dc變換器輸出一個帶直流偏置的波,使右邊的兩象限dc / dc變換器輸出一個相差180度帶同樣直流偏置的波形,這樣,負載zl上的電壓是左、右兩個dc / dc變換器電壓的差動輸出,好可以消掉直流偏置,最終在負載r1上得到的就是波。
  12. The inverted pwm changing electric current the technique is applied in the prototype model. the prototype model was tested and operated on spot, power factor could reach beyond 0. 95, the effect of following modulating voltage was better, the curve of factor of modulated voltage of exchanging systems changed following load rate was linear, the output of wave form was a flat and steady sinusoidal wave

    樣機採用了變式pwm變流技術,對其進行了現場測試與試運行,測試結果是電網側的功率因數可達0 . 95以上,跟蹤調壓效果良好,變流系統輸出調壓系數( k )隨負載率( p )的變化曲線基本滿足直線關系,輸出波形呈平滑穩定的波。
  13. Using dsp of ti inc. - - - - - - - tms320f240 this thesis develops a general ac variable - speed system, and then carries out the research on various new control strategies for induction motor based on it. this paper explains sine pulse width modulation ( spwm ), space - vector pulse width modulation ( svpwm ), and new pulse width modulation method - hybrid space vector pulse width modulation ( hsvpwm ) aiming at a inherent problem of dead time in the common pulse width modulation

    本文闡述了脈寬調制( spwm )控制技術;電壓空間矢量( svpwm )控制技術;以及針對常用脈寬調制方法中存在的一個固有問題? ?變器開關器件死區時間的影響,提出了一種新的脈寬調制方法:混合空間矢量脈寬調制控制技術。
  14. Both software and hardware are synthesized. three - phase bridge inverter used, the current in each phase is made similar to sine wave using current closed loop control

    以igbt三相橋作為主變電路,對電機繞組電流按規律進行電流閉環控制實現波細分驅動。
  15. Then, a semi - analytical solution for the velocity response of the pile subjected to a semi - sine wave exciting force was derived by using invert fourier transform

    利用付立葉變換,給出了半脈沖激勵下樁頂速度時域響應半解析解。
  16. Thus the resistance factor and vibration modes of the soil layer are obtained and used to analysis the pile response. by considering the interaction between the soil layer and the pile with boundary condition of continuity of displacement and equilibrium of force at the interface of soil layer and pile, the dynamic equilibrium equation of pile is solved and an analytical solution for the pile response in frequency domain is yielded, which is used to define complex stiffness and mobility at the level of the pile head. based on the convolution theorem and inverse fourier transform, a semi - analytical solution of velocity response in time - domain subjected to a semi - sine exciting force is given

    首先通過引入勢函數方法對土體位移進行分解,從而將土體動力平衡方程解耦,求解得到了土層的振動模態和阻抗因子,然後利用該解以小應變條件下樁土接觸面上力平衡和位移連續條件來考慮樁土耦合作用,求解樁的動力平衡方程,得到了樁頂的頻域響應解析解、復剛度和速度導納,利用卷積定理和傅里葉變換,求得了半脈沖激振力作用下樁頂速度時域響應半解析解。
  17. The performance of the electric vehicle is improved greatly in which the harmonic wave of output voltage, power loss and torque pulsation of the system are decreased by controlling the switch angles

    它運用規則采樣法產生脈寬調制波,通過開關角的控制抑制變器輸出電壓中的諧波分量,降低了電動機的損耗和轉矩脈動,使電動車的運行性能得到了較大改善。
  18. The asynchronous motor is widely used for its simple construction, ruggedness, high working reliability, relatively low cost, and high environmental adaptability. it is suit for the direction of high voltage, high speed and large capacity. vector control is its ideal speed modulation method. the harmonics of three - level inverter are less than the traditional two - level inverter ’ s, and it is convenient to realize high sinusoidal voltage output. the maximum voltage strength which each electric component bears is small, and it is easy for three - level inverter to realize large capacity. the research on the asynchronous motor vector control based on the three - level inverter is one novel work

    異步電機結構簡單、堅固耐用、運行可靠、成本低、環境適應性強,容易向高壓高速和大容量方向發展,獲得了廣泛應用,矢量控制為其理想的調速方法;三電平變器輸出端諧波少,有利於實現輸出電壓的化,且單個開關管承受的最大電壓小,適合向高壓大容量方向發展。對基於三電平變器的異步電機調速系統開展矢量控制研究,是一件有意義的工作。
  19. The 500va experimental prototype of aero static inverter has the advantages of flat volt - ampere characteristic, small thd of output sinusoid voltage, high efficiency, small size, light weight and low cost

    500va輸出的航空靜止變流器樣機試驗結果表明,變電路輸出外特性平直,電壓失真度小,變換效率高,體積小,成本低。
  20. The experiment result shows that conversion efficiency in ccm is improved by 2 percent compared with that in dcm, although the on - resistance of winding in ccm is more than that in dcm. the analysis of open - loop transfer function in both dcm and ccm shows that pull - push hfl inverter at ccm

    微分補償網路的推挽高頻鏈變電路在輸出從空載變化到額定阻性負載變化的過程中,變電路工作模式從dcm變化到ccm模式,實驗結果表明電路在這兩種模式下都能輸出穩定的電壓,且具有較高的穩態精度。
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