back emf 中文意思是什麼

back emf 解釋
反電動勢
  • back : n 1 背，背部；背脊；背面，反面；背後，後部，後面，裏面。2 （指）甲；（刀）背；（手）背；（書）背...
  • emf : 紅細炮成熟因子
  1. The mechanical platform of unregulated voltages, power and back - emf spikes, and the electronic platform of clean power and 5 - volt signals

    非調節電壓、電力和反電動勢峰的機械平臺以及干凈電源和5伏信號的電子平臺。
  2. Secondly, the effects of the crest width of the back - emf waveform to the torque ripple in the 120 ? conduction mode are analyzed, among which the effects of the advance commutation angle to the torque ripple are quantificationally analyzed for the bldcm drives whose back - emf waveform crest width is less than 120 ?,

    其次分析了120導通方式下反電動勢平頂寬度對轉矩脈動的影響，對于平頂寬度小於120電角的非理想梯形波反電動勢，定量分析了換相超前角對換相轉矩脈動的影響。
  3. For the bldcm which has a pseudo - sinusoidal back - emf waveform, this dissertation presents a svpwm control method using six discrete position signals for minimizing the torque ripple. the main aspects for the implementation of this method are analyzed, including the initial orientation of the voltage vector, reasonable choice of the impedance angle and the advance commutation angle, and estimation of the successive rotor positions

    針對反電動勢類似正弦的準正弦波反電動勢無刷直流電動機，本文提出一種基於六個離散位置信號的自同步svpwm （電壓空間矢量法）控制方法，用以削弱電磁轉矩脈動，分析了實現這種方法的主要控制環節，包括起動時電壓空間矢量的初始定位，阻抗角與電流超前角的合理選擇以及連續轉子位置的估計等。
  4. The simulation results prove that this control technique can effectively minimize the torque ripple for the bldcm drives whose back - emf waveform crest width is less than 120

    模擬結果表明這種控制策略能有效地抑制反電動勢平頂寬度小於120電角的無刷直流電動機的換相轉矩脈動。
  5. Furthermore, this dissertation also gives a comprehensive analysis and comparison to the torque ripple factor, torque - current ratio and other aspects for pseudo - sinusoidal emf bldcm drived by 120 conduction mode, 180 conduction mode and self - synchronous svpwm mode respectively. the simulation and the experimental results indicate that self - synchronous svpwm method is more effective for minimizing the torque ripple without any expense of the torque - current ratio when the crest width of the back - emf waveform is less than 107 electrical angles

    對準正弦波反電動勢無刷直流電動機在120導通方式、 180導通方式和自同步svpwm三種控制方式下的轉矩脈動系數、轉矩電流比等方面進行了全面的分析與比較，模擬研究和實驗結果表明，當反電動勢的平頂寬度小於107電角時，採用自同步svpwm控制方法可以在不損失轉矩電流比的基礎上，更有效地抑制電磁轉矩脈動。
  6. For the bldcm which has a general crest width of the back - emf waveform, two kinds of torque ripple conditions when drived by sine - wave current as well as by square - wave current are deduced based on the mathematical models. in addition, a comparison is carried out between these two conditions, which indicates that sinusoidal current driving is more favorable to minimizing the torque ripple when the crest width of the back - emf waveform is less than a certain value

    闡述了抑制齒槽轉矩措施對反電動勢波形的影響，利用無刷直流電機的數學模型推導並比較了任意平頂寬度梯形波反電動勢在正弦波和矩形波兩種電流驅動下的電磁轉矩脈動情況，得出在梯形波平頂寬度減小到一定數值后採用正弦電流驅動更有利於減小電磁轉矩脈動。
  7. Second, as currently study of hot point, back ? emf, it will discuss the principle of the sub - position examination in detail. based on the principle, it put forward a kind of improving back - emf method of crossing - zero checking turns position. but this did n ' t resolve to the root problem that the speed scope is very narrow and it need an in expiation of speed error and so on. thus it put forward a new improvement method at next chapter

    其次，就目前所研究的熱點? ?反電勢法，詳細討論了其轉子位置檢測的原理，在此基礎上提出了一種改進的反電勢過零點檢測方法，其可直接從電機端部得出反電勢對地的電壓值，而不是通過電機中心點電壓來得到反電勢。
  8. The chip jk3ce that is one of micro - controllers in motorola 68hc08 family is used as control unit in this system. the zero crossing point of the back emf can be obtained by comparing the terminal voltage with the virtual neutral point, then using the software of the system can figure out the commutation period. the electronic commutation replaces the mechanical commutation in this way

    本系統採用的控制晶元為motorola系列單片機中的jk3ce ，反電勢過零點可以通過比較電機端電壓和虛擬中點電壓來得到，將過零點信號送往單片機捕捉埠後由系統軟體來確定換相時刻，這樣就可以由電子換向裝置替代機械換相裝置，有利於提高系統運行的可靠性，並降低了系統維護的費用。
  9. To guarantee the validity and speediness insimulation, the back - emf is generated using piecewise linear curves. in the double loop of control system, a pi controller is adopted in the speed loop and a hysteresis current controller is adopted in the current loop

    為保證模擬快速性和有效性，模型採用分段線性法生成梯形波反電動勢，系統採用雙閉環控制:速度環採用pi控制，電流環採用滯環電流控制。
  10. The thesis first probably explains brushless direct current motor ( bldcm ), and discusses the related control methods, explains the background and meaning of back electromotive force ( back - emf ) which is used in the thesis. then the thesis expounds the basic component parts, the basic running principle, the running characteristic and transfer function of the bldcm. and then the thesis detailedly dissertates its research pivot : the simulation of bldcm system in matlab based on the method of back - emf and the control system of digital signal processor ( dsp ) based on the method of back - emf

    本文首先對無刷直流電機進行了概述，並對其相關控制方法進行了討論，說明本文所採用反電動勢法的背景和意義;接著論述了無刷直流電機基本組成環節、基本工作原理、運行特性和傳遞函數，然後是詳述本文研究的重點:基於反電動勢法的matlab調速系統的模擬以及基於反電動勢法的dsp控制系統的實現。
  11. This system is designed to measure motor ’ s three important parameters including stator coil inductance, stalling torque and back emf. all of these test results are used as basis for product detect

    設計這套測試系統用來檢測電機定子繞組電感、堵轉扭矩及反電動勢等三個重要電機參數，把其結果作為檢驗產品質量的依據。
  12. This topic discusses the back - emf zero - crossing detection, the method of phase judging and compensation in detail. in order to improve the speeding performance we adopt the digital closed - loop speed control strategy

    詳細介紹了反電動勢過零檢測、相位判斷及相位補償的原理及實現方法，並且為了在較寬范圍內提高bldcm的調速性能，採用了數字式轉速閉環控制。
  13. For the bldcm which has a neither sinusoidal nor trapezoidal back - emf, that is, for a general shape back - emf bldcm, this dissertation proposes a novel id = 0 vector control method. by this method, the iq for a constant torque to produce is calculated through coordinate transformation, and the reference iq is tracked by vector control in the dq0 frame

    對于實際反電動勢波形既非正弦又非梯形波的無刷直流電動機，提出一種新型的任意波形反電動勢無刷直流電動機的i _ d = 0矢量控制方法，通過坐標變換浙江大學博士學位佑文摘要求解產生恆定電磁轉矩所需的q軸電流，並在dqo坐標系下通過矢量控制對q軸參考電流進行跟蹤。
  14. We also select the microchip pic16f877 made by microchip co. ltd as a control chip to realize micro - computer control. this system use three separate channel to find out the " across the zero point " of each back - emf. the program use digital filter to wipe off the pwm interferences and the commutating interferences

    系統中採用三個獨立通道分別檢測無刷電機三相繞組的反電勢的各自過零點，同時在軟體中採用數字濾波以消除其它噪聲干擾，使檢測電路檢測到的反電勢過零點更加準確可靠，實現了對五位置傳感器直流無刷電機的數字控制。
  15. In order to minimize the commutation torque ripple of traditional trapezoidal bldcm using 120 cconduction mode, firstly, analytical formulae of commutation torque in the condition of perfect back - emf waveforms are developed in this thesis, based on which the effects to the torque ripple by the pwm modes, overlapping commutation techniques and so on are analyzed, and the applicable speed ranges of the motors using the overlapping commutation techniques are derived

    為了抑制傳統的三相六狀態120導通方式控制下方波型無刷直流電動機的換相轉矩脈動，本文首先在理想反電動勢的條件下推導了換相轉矩脈動的解析公式，並由此分析了調制方式、重疊換相技術等對換相轉矩脈動的影響，得出了採用重疊換相技術抑制換相轉矩脈動適用的電機轉速范圍。
  16. In this paper, the influence of rotor - skewing on the machine performance, such as the unbalanced radial force, cogging torque and back emf, is analyzed, with two different prototypes being comparatively studied

    分析了轉子斜極對其不對稱徑向力、齒槽定位轉矩和反電勢等性能的影響，並用兩種不同結構的電機進行對比研究。
  17. This dissertation presents several novel control techniques for the torque ripple minimization of pm bldcm. according to the different back - emf waveforms of bldcm, this dissertation gives a detailed analysis to the torque ripple due to trapezoidal emf, pseudo - sinusoidal emf, and general shape emf respectively, and from each one proposes a kind of control technique for torque ripple minimization

    根據永磁無刷直流電動機反電勢波形的不同，對方波型無刷直流電動機的換相轉矩脈動，準正弦波（ pseudo - sinusoidalemf ）反電動勢無刷直流電動機以及任意波形反電動勢無刷直流電動機的電磁轉矩脈動，進行了詳細的分析，分別提出三種不同的控制策略，進行轉矩脈動抑制控制。
  18. It elaborates on the 3 - step start technique. i adopt the method which permits the bldc motor to automatically search the best time to change its operation stage from a separately controlled synchronous one to a self controlled one using the back emf as the commutation signal. this method prevents the stepping out and stopping problems in the changing procedure of the motor

    闡述了電機的三段式起動方法，在直流無刷電機由起動階段外同步運行切換到反電勢換向自同步運行的過程中採用了自尋最優點切換的方法，保證了電機在切換過程中不會發生失步和停轉現象。
  19. The technique of back emf induction in bldc motor is analyzed, the " virtual neutral point " method and the technique of " 3 - step " start are introduced

    主要分析了反電動勢感應方法，並闡述了虛擬中點法和三段式起動技術。
  20. In hybrid stepper motor, the back emf of stator winding is function of rotor position, continuous rotor position is obtained from the function

    就混合式步進電機而言，定子繞組的反電勢是轉子位置的函數，從而可以解算出連續的轉子位置信息。
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