emf method 中文意思是什麼

emf method 解釋
電動勢法
  • emf : 紅細炮成熟因子
  • method : n 1 方法，方式；順序。2 （思想、言談上的）條理，規律，秩序。3 【生物學】分類法。4 〈M 〉【戲劇】...
  1. Standard test method for thermal emf test of single thermoelement materials by comparison with a reference thermoelement of similar emf - temperature properties

    與有相同電動勢溫度性能的標準熱電偶相比較測定單個熱電偶材料的熱電動勢的標準試驗方法
  2. 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。
  3. 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。
  4. The test method of thermo - emf for platinum rhodium thermocouple thin wires

    鉑銠熱電偶細絲的熱電動勢測量方法
  5. Based on intelligent power module ( ipm ) and digital signal processor ( dsp ), this system used hack - emf ( electromotive force ) method to implement the sensorless control for brushless dc motor of air conditioner ( ac ) in fcv

    該系統基於智能功率模塊（ ipm ）和數字信號處理器（ dsp ） ，採用反電勢法實現了電動汽車空調用無刷直流電動機的無傳感器控制。
  6. 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。
  7. 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。
  8. 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。
  9. 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。
  10. 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。
  11. 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。
  12. At the end of this paper, i put forward a new back emf sensing method which does n ' t require a virtual neutral point to realize the sensing for rotor flux position. it improves the performance of bldc motor at low speed and at high speed and broaden its range of timing

    最後針對系統的不足，提出了另外一種不需要引出虛擬中點的反電勢檢測方法來實現對轉子位置的檢測，它能夠提高電機低速和高速運行時的性能，拓寬直流無刷電機的調速范圍。
  13. We bring forward a new method to reduce the additive electromotive force ( emf ) in circuit of the electrode leads

    提出了一種有效抑制電極引線迴路中附加感生電動勢的方法。
  14. The elf - emfs had no impact on neurite outgrowth. it was concluded that elf - emf, with the advantage of economy, convenience, as well as easy control, might be an effective method ex vivo to manipulate neural progenitors differentiation in stem - cell therapy. the possible mechanism of the elf - emfs effects on neurogenesis of mesencephalic progenitors was further explored

    Emfs的此效應具有頻率特異性，場強也是影響因素； 10 20 40hz （ 8mt ） emfs還可增加衍生於中腦神經前體細胞的th陽性細胞數；但各頻率emf對神經突的延伸均無作用。
  15. The motor ' s magnetic field is analyzed with finite element method ( fem ) by ansys software. the emf and electro - magnetic torque are calculated with path method base on the air gap magnetic flux density ( b )

    運用有限元分析軟體ansys對電機內部磁場進行模擬分析，得出電機內部磁場磁密及磁場強度分佈情況，在此基礎上運用路徑法對電樞反電動勢、電磁轉矩等電磁參數進行了分析計算。
  16. The simulation results testify the reasonability and validity of the back - emf, and also testify the validity of the method for modeling

    模擬結果證實了反電動勢控製法的可行性和有效性，也證明了該建模思路的有效性。
  17. To implement this method, the structures of both the hardware and the software are analyzed in detail. the simulation and the experimental results show that this control technique can effectively minimize the torque ripple caused by distortion of the back - emf

    闡述了實現這種方法的軟、硬體結構，模擬研究和實驗結果表明這種控制策略可以有效地抑制由於反電動勢的偏差所產生的電磁轉矩脈動。
  18. Analysis of diode grid equilent impedance in waveguide using emf method

    方法分析波導中二極體柵格的等效阻抗
  19. In the system, control unit accomplishes back - emf zero - crossing information reading and closed loop commutation. the system eliminates the pwm interferences and the commutating interferences by filtering with software algorithm. in order to make the bldc commutate exactly, the method of three - point estimation is used for phase locking in the system. the system also accomplishes several important objects, such as tmppt of photovoltaic arrays, unmanned supervision of the system, fault detection etc. the results of the experiment show that the device, which is made on the base of the principle above, can control the motor to complete the exact commutation

    系統以motorola單片機jl3為核心，完成了系統外圍硬體電路和控制軟體設計，實現了直流無刷電機反電勢過零檢測，利用軟體濾波的方式消除了pwm波干擾及換相干擾；採用三點預估演算法，進行相位鎖定，以完成直流無刷電機準確換相；同時實現了光伏陣列工作點的tmppt跟蹤、系統無人監控和故障檢測等功能。
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