本文關(guān)鍵詞： 位置檢測(cè) 空間矢量脈寬調(diào)制 無(wú)刷直流電機(jī) 無(wú)位置傳感器　出處：《中南林業(yè)科技大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：無(wú)位置傳感器無(wú)刷直流電機(jī)因其結(jié)構(gòu)簡(jiǎn)單、成本低廉、運(yùn)行可靠等優(yōu)點(diǎn)在工業(yè)、農(nóng)業(yè)、民用等眾多領(lǐng)域得到了廣泛的應(yīng)用。然而,無(wú)位置傳感器無(wú)刷直流電機(jī)仍然存在換相轉(zhuǎn)矩脈動(dòng)大、換相時(shí)間難以準(zhǔn)確控制等問(wèn)題。針對(duì)此類(lèi)問(wèn)題,本文采用空間矢量脈寬調(diào)制(SVPWM)技術(shù)較好地解決了存在的問(wèn)題,研究?jī)?nèi)容如下:首先,介紹了無(wú)位置傳感器無(wú)刷直流電機(jī)位置檢測(cè)方法的國(guó)內(nèi)外研究現(xiàn)狀,對(duì)比分析了傳統(tǒng)的反電動(dòng)勢(shì)過(guò)零檢測(cè)端電壓檢測(cè)法與相電壓檢測(cè)法,對(duì)三相電動(dòng)勢(shì)疊加的轉(zhuǎn)子位置檢測(cè)法進(jìn)行了深入的研究,提出了一種優(yōu)化的反電動(dòng)勢(shì)疊加算法。其次,針對(duì)換相期間電流發(fā)生波動(dòng)帶來(lái)的轉(zhuǎn)矩脈動(dòng)問(wèn)題,對(duì)SPWM(正弦波脈寬調(diào)制)技術(shù)與SVPWM技術(shù)進(jìn)行對(duì)比研究,重點(diǎn)研究了 SVPWM技術(shù)的基本原理,并在旋轉(zhuǎn)坐標(biāo)系上建立了基于id= 0運(yùn)動(dòng)方式的電機(jī)數(shù)學(xué)模型,完成了 SVPWM技術(shù)中矢量位置、作用時(shí)間及作用順序等關(guān)鍵技術(shù)的設(shè)計(jì)。最后,搭建了無(wú)位置傳感器無(wú)刷直流電機(jī)SVPWM控制系統(tǒng)仿真模型,仿真結(jié)果驗(yàn)證了優(yōu)化后的反電動(dòng)勢(shì)疊加位置檢測(cè)法能與SVPWM技術(shù)有效結(jié)合,優(yōu)化后的反電動(dòng)勢(shì)疊加法能正確檢測(cè)到換向信號(hào),準(zhǔn)確跟蹤轉(zhuǎn)子角度,精準(zhǔn)控制空間矢量扇區(qū)切換,三相電流波形近似于正弦波,磁鏈軌跡呈圓形,系統(tǒng)帶負(fù)載能力增強(qiáng),動(dòng)態(tài)響應(yīng)速度加快,達(dá)到了預(yù)期控制效果,具有一定的實(shí)踐應(yīng)用價(jià)值。
[Abstract]:Sensorless brushless DC motor (BLDCM) has been widely used in many fields such as industry agriculture and civil because of its simple structure low cost and reliable operation. The sensorless brushless DC motor still has the problems of large commutation torque ripple and difficult to control the commutation time accurately. In this paper, space vector pulse width modulation (SVPWM) technology is used to solve the existing problems. The research contents are as follows: first of all. This paper introduces the research status of position detection method of sensorless brushless DC motor at home and abroad, and compares and analyzes the traditional method of end voltage detection and phase voltage detection of back-EMF zero crossing detection. The rotor position detection method of three-phase EMF superposition is studied deeply, and an optimized backEMF superposition algorithm is proposed. Secondly, the torque ripple caused by current fluctuation during commutation is studied. The comparison of SPWM (sinusoidal pulse width modulation) technology and SVPWM technology is carried out, and the basic principle of SVPWM technology is emphatically studied. The mathematical model of motor based on id= 0 motion mode is established in the rotating coordinate system, and the key technologies of SVPWM technology, such as vector position, action time and action sequence, are designed. Finally. The simulation model of position sensorless brushless DC motor SVPWM control system is built. The simulation results show that the optimized backEMF superposition position detection method can be effectively combined with SVPWM technology. The optimized backEMF superposition method can correctly detect commutative signals, accurately track rotor angle, accurately control space vector sector switching, three-phase current waveform is similar to sine wave, and the flux locus is circular. The dynamic response speed of the system increases with the increase of load capacity, and achieves the expected control effect, which has certain practical application value.
【學(xué)位授予單位】：中南林業(yè)科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM33

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本文編號(hào)：1488351