variable width pulse 中文意思是什麼
variable width pulse
解釋
寬度可變脈沖-
This thesis introduces the base theory and correlative information of variable frequency speed variation, and expatiates sinusoidal pulse width modulation ( spwm ). the principle of svpwm is in - depth discussed, and a simple algorithm for svpwm is ratiocinated
本文介紹了交流變頻調速的發展概況，分析了其基本原理，闡述了正弦脈寬調制（ spwm ）原理，對svpwm理論進行了研究，給出了svpwm的簡單實現演算法。 -
The study has completed the design of two - phase inverter and made up of the two - phase inverter - motor system for experimental use it is a variable frequency adjustable speed system with a open - loop control of rotational speed, which consists of voltage - controlled oscillator circulating assign device inverter circuit and two - phase induction motor a accurate mathematical model is set based on the whole system, and simulator program of dynamic and steady condition is established, which is used to calculate the dynamic and steady performance by kron and symmetrical coordinate converter by simulator calculation and experimental research with specific parameter of the system, a comparison is made between predicted and experimental characteristics, experimental measurements are shown to compare closely with corresponding theoretical result it is compared with some variable frequency adjus table speed system comprising inverter and single - phase induction motor from the system efficiency torque pulsation and the effect of two - phase inverter capacitance based on the conclusion, harmonic cancellation pulse width modulation control of a two - phase inverter - fed induction - motor drive system is researched, which cancelled the low harmonic and improve the system performance
通過對電機的kron變換和對稱分量變換，建立了系統較精確的數學模型，編制了系統動態及穩態運行的模擬計算程序分別計算系統的動態和穩態性能。通過對系統的具體參數進行了模擬運算和實驗研究，實驗和模擬結果進行比較，說明實驗和理論較為一致，並從系統效率、轉矩脈動及兩相逆變器電容的影響等方面與各種逆變器和單相異步電動機組成的變頻調速系統加以比較。在此基礎上，對兩相逆變器供電-異步電動機系統使用諧波抑制pwm控制進行了研究，由於減少了低次諧波，改善了系統性能。 -
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，建立了正弦脈寬調制（ spwm ）逆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；其次從逆變器-異步電動機系統能量轉換角度出發，提出通過檢測逆變器輸入電流中負電流的間隔時間是否大於1 / f _ c （ f _ c為逆變器載波頻率）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正確性。 -
This paper expatiated that the mathematics models of ac motor is higher order, non - linear and closed coupling, multivariable input - output system. and introduces the principle and the algorithm of sine pulse width modulation ( spwm ), opened - loop space voltage pulse width modulation control ( svpwm ) and field oriented control ( foc ). finally, realized the control strategies of variable - frequency speed regulating using assembly and c language
文中闡述了交流異步電機的數學模型是高階、非線性、強耦合的多變量輸入輸出系統，介紹了交流電機的正弦脈寬調制、開環電壓空間矢量的u / f控制和磁場定向控制的原理及控制演算法，並利用dsp構成控制系統，通過匯編語言和16位定點c語言混合編程的方法實現了上述的變頻調速控制策略。 -
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
本文闡述了正弦脈寬調制（ 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? ?逆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。 -
An energy controllable ecm pulse generator which machining gap appearance changes with the detected eum current variable is developed, to make the electrolysis thickness of ecm and machining gap width of the diamond controllable
用檢測電流的方法，設計和研製隨間隙狀態變化能量可控的脈沖電解電源，用於金剛石節塊電解修刃，以實現電解電蝕層厚度的基本可控，從而可實際控制金剛石的出刃高度。 -
Up to now, the normal control mode for smart power integrated circuit ( spic ) has pwm and pfm. pwm bases on cfvw ( constant frequency variable width ) control pulse, whereas, pfm bases on cwvf ( constant width variable frequency ) control pulse
迄今，智能功率集成電路（ spic ）習用控制模式為恆頻變寬（ cfvw ）的脈寬調制模式（ pwm ）和恆寬變頻（ cwvf ）的脈頻調制模式（ pfm ） 。 -
With variable edge time, pulse width and voltage level, the 33250a is ideally suited to a wide variety of pulse applications
它具有可變的跳變沿時間，脈沖寬度和電平，是適應您各種 -
The sinusoidal pulse width modulation variable - frequency speed - regulated system based on 80c196mc microcontroller
單片機的正弦脈沖寬度調制變頻調速系統 -
Variable width pulse
可變寬度脈沖 -
Agrawal ' s theory model of soa ca n ' t simulate accurately the amplified signal pulse shape in soa when the pulse width is as short as several picosecond. so we simulate accurately the peak power, full width half maximum, rising time and falling time of amplified pulse after considering the gain compression, gain asymmetry, gain shift, gain variable with situation and time. with ultrahigh velocity dense wavelength division multiplexing ( dwdm ) and optical time division multiplexing ( otdm ) developing, we demand more and more short signal pulse and more signal channels
但當信號脈沖的寬度只有幾個皮秒時， soa傳統的agrawal理論模型已經不能完全準確地模擬soa對信號脈沖的放大情況，在此基礎上，我們在全面考慮soa的增益壓縮、增益非對稱和漂移、增益隨位置和時間變化的載流子壽命等物理機制的情況下，對皮秒超短高斯信號光脈沖經soa放大后的脈沖的峰值功率、脈沖半值全寬度、脈沖的上升時間和下降時間等重要物理參量進行了準確模擬和詳細研究。 -
This paper investigates the induction motor full digital ac frequency conversion system, and develops an ac motor experiment platform based on dsp tms320f240, the software and hardware implementation of the system is discussed in detail. the industry computer controls the dsp to output the space vector pulse width modulation voltage wave ( svpwm ) onto the induction motor. using this software we can view the state variable waveform on the pc and modify the variable in the dsp memory
本論文結合「基於dsp的交流電機實驗控制系統」實際科研項目，開發出基於dsp的全數字交流電機實驗控制平臺，給出了該系統平臺的軟硬體設計方案，該系統使用工控pc機對下位機dsp進行實時控制，在dsp中依據選定的電機控制策略程序，發出空間矢量脈寬調制形式的電壓波形，實現對交流電機變壓變頻控制；在上位機中能實時查看變量波形，並對dsp內存變量進行修改，在該平臺上能方便的使用軟體實現各種高性能的電機控制演算法。
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