bemf 中文意思是什麼

bemf 解釋
反電動勢
  1. Then one of the methods of rotor position detection - bemf zero crossing point detection is explained in detail. in succession, the chapter dissertates the method of measuring phase voltage and supply voltage, and analyses the error of rotor position using this method

    對轉子位置檢測方法中的反電勢過零點法作了比較詳細的介紹，討論了反電勢法中相電壓和端電壓的檢測方法，並分析了利用該方法時而產生的轉子位置檢測誤差。
  2. In this chapter, the method of bldcm rotor position detection is first discussed. then the principle and algorithm of bemf zero crossing point detection is explained. in succession, the chapter dissertates the software realization of the bemf zero crossing point detection algorithm, the software disturbance filter and the modification of phase displacement, and the software realization of commutation point

    在這一章中，先簡述了無刷直流電機的轉子位置器檢測方法；然後論述了反電動勢過零檢測原理和演算法以及該演算法的軟體實現、軟體濾波和相移修正、換相點的軟體實現；最後對軟體開環換相起動策略作了詳細論述。
  3. The non - ideal bemf waveform of bldcm is often caused by two facts. one is that the platform width of bemf waveform is less than 120 ; the other is the cogging harmonics existed in the bemf waveform

    非理想反電動勢波形的無刷直流電機有兩種情況，一種是反電動勢的梯形波的平頂寬度小於120 ；一種是由於磁場分佈受齒槽的影響，反電動勢存在齒諧波，使其波形發生畸變。
  4. Then the thesis detailedly dissertates its research pivot : the software realization of sensorless commutation detection based on the method of back electromotive force ( bemf ) and open - loop commutation start - up

    然後，詳細論述了本文的研究重點：基於反電動勢法的五位置傳感器換相檢測和開環換相起動的軟體實現。
  5. In the proposed technique the bemf waveform of bldcm need to be measured in advance at first, through computer simulation and frame transformation, the optimum q - axis current command is achieved. in order to minimize the torque ripple, the d and 0 - axis current command should be zero. furthermore, through reference frame transformation from dqo - axis to abc - axis, we can get the optimum current command in static abc reference frame

    在這種控制方法中首先測量出電機的實際反電動勢波形，然後通過計算機擬合和坐標變換，求得產生恆定電磁轉矩所需的q軸電流，令i _ d ~ * = i _ 0 ~ * = 0 ，通過坐標變換，得到三相靜止坐標系a - b - c下的參考電流i _ a ~ * ， i _ b ~ * ， i _ c ~ * ，利用電流滯環控制來產生pwm信號，由於這種控制方法中電流不會突變，從而可以較好的抑制轉矩脈動。
  6. The ideal bemf waveform of bldcm is trapezoid with 120 ! platform width. in the 120 conduction mode, the stator current is not ideal due to the stator inductance, and the torque ripple occurs

    理想的永磁無刷直流電動機的反電動勢的波形是120平頂的梯形波，在三相六狀態120導通方式控制下，電流由於電機定子電感的存在而不是理想方波，因此產生了換相轉矩脈動。
  7. Regard how to structure the control system of sensorless bldcm with dsp - tms320f240 as the centre in this paper, the detailed argumentation course of the motor startup, bemf terminal voltage measurement and control strategy is given out, give and pay concrete details for the software and hardware realization and experimental result. in order to treat the bldcm control system with dsp clearly, the full paper divides into six chapters altogether : chapter one, introduceing the development course, the structure characteristic and operation principle, etc. of bldcm in the introduction ; chapter two, directed against the startup issue of bldcm, the chapter give and publish the rotor measure pulse orients technology for motor startup in detail ; chapter three, proceed with mathematics model of the bldcm, expounding the control schemes ; chapter four, two important devices introducing : dsp ( 240 tms320f ) and power invertor control chip ( ir2131s ) ; chapter five, give and publish the detail of hardwares of control system ; chapter six, by ccs ide of ti, realize the control schemes in the front chapters with software, offere the procedure flow chart of main subroutine and some key place of programming, the experiment result in addition

    全文共分六章：第一章、緒論中介紹了bldcm的發展歷程、電機本身的結構特點和工作原理等；第二章、針對五位置傳感器bldcm的起動問題，文中詳細給出了檢測脈沖轉子定位起動技術；第三章、從電機的數學模型入手，詳細論述了反電動勢端電壓法和系統的控制策略；第四章、介紹了硬體實現中的兩個重要器件： dsp （ tms320f240 ）和功率管逆變器控制晶元（ ir2131s ） ；第五章、詳細給出了控制系統的硬體實現細節；第六章、利用ti提供的ccs集成開發環境，將前面章節的控制方案用軟體加以實現，給出了主要部分的程序流程圖和一些編程要點以及實驗結果。
  8. Based on " lagging 30 - a commutation ", the " lagging 90 - a commutation " method is brought forward to overcome the shortages existing in the traditional zero bemf, then the rang of a is expanded and the reliability of commutation is increased

    針對該檢測方法中的相位延遲角問題，在原有的「延遲30 ?換相原理」的基礎上，利用「 90 ?換相原理」對其進行改進，增加了相位移的取值范圍，提高了電機換相時的可靠性。
  9. Aiming to minimize the torque ripple in condition of non - perfect bemf waveform, the dissertation present a optimum current tracking control technique

    針對這種反電動勢波形偏離理想波形的情況，本文提出了一種最優電流跟蹤法來抑制轉矩脈動。
  10. At first, the dissertation analyses the principles, the operation theory and the control techniques of bldcm ( brushless dc motor ). then according to the different bemf of different bldc motor, the dissertation analyses the torque ripple in the bldcm with ideal 120 擄 trapezoidal waveform bemf and non - ideal bemf waveform respectively. further more the dissertation presents different novel control techniques of the torque ripple minimization in bldcm

    首先，對永磁無刷直流電機的定義，工作原理，控制方法進行了分析，然後根據永磁無刷直流電機的反電動勢波形的不同，對理想方波型無刷直流電動機的換相轉矩脈動，非理想方波反電動勢的無刷直流電動機的換相轉矩脈動進行了詳細的分析，並分別提出了不同的控制策略，對其換相轉矩脈動進行抑制。
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