本文選題：無(wú)刷直流電機(jī) + 無(wú)位置傳感器　； 參考：《華南理工大學(xué)》2014年碩士論文

【摘要】：無(wú)刷直流電機(jī)在直流電機(jī)基礎(chǔ)上發(fā)展起來(lái)，不僅具有直流電機(jī)的調(diào)速性能，而且效率高、運(yùn)行可靠、壽命長(zhǎng)。其中應(yīng)用最廣泛的基于反電動(dòng)勢(shì)法的無(wú)位置傳感器的控制方法是無(wú)刷直流電機(jī)發(fā)展的一個(gè)重要趨勢(shì)。 本文針對(duì)反電動(dòng)勢(shì)法在無(wú)刷直流電機(jī)靜止啟動(dòng)過(guò)程檢測(cè)不靈敏的缺點(diǎn)，提出了一種新型的啟動(dòng)方法。轉(zhuǎn)子初始位置辨識(shí)階段，采用三相繞阻導(dǎo)通二次定位法，把轉(zhuǎn)子從未知的位置簡(jiǎn)單而有效地定位到目標(biāo)位置，具有良好的穩(wěn)定性。電機(jī)加速啟動(dòng)階段，是反電動(dòng)勢(shì)法檢測(cè)盲區(qū)，通過(guò)幾拍的開(kāi)環(huán)加速方法，使電機(jī)短時(shí)間內(nèi)加速到反電動(dòng)勢(shì)法能夠精確檢測(cè)的轉(zhuǎn)速閾值。在電機(jī)低速運(yùn)行階段，反電動(dòng)勢(shì)法檢測(cè)不靈敏，通過(guò)定量和定性地分析不導(dǎo)通相反電動(dòng)勢(shì)與感應(yīng)電勢(shì)的關(guān)系，設(shè)計(jì)出感應(yīng)電勢(shì)過(guò)零檢測(cè)方法，在電路實(shí)現(xiàn)上則巧妙地利用結(jié)型場(chǎng)效應(yīng)管進(jìn)行分壓，利用合適的小電阻來(lái)增大感應(yīng)電勢(shì)，實(shí)驗(yàn)驗(yàn)證其過(guò)零檢測(cè)準(zhǔn)確度較高，，抗干擾性高，提高了無(wú)位置傳感器無(wú)刷直流電機(jī)在低速狀態(tài)的檢測(cè)范圍。電機(jī)高速運(yùn)行階段，則切換到反電動(dòng)勢(shì)過(guò)零檢測(cè)。 最后，搭建了以PIC單片機(jī)為控制器的無(wú)刷直流電機(jī)控制系統(tǒng)硬件平臺(tái)和以MPLAB IDE為集成開(kāi)發(fā)環(huán)境的無(wú)刷直流電機(jī)控制系統(tǒng)軟件平臺(tái)。通過(guò)軟硬件控制平臺(tái)，證明新型啟動(dòng)方法在恒負(fù)載條件下，具有啟動(dòng)快速性和低速運(yùn)行穩(wěn)定性和可行性。
[Abstract]:Brushless DC motor is developed on the basis of DC motor. It not only has the speed regulation performance of DC motor, but also has high efficiency, reliable operation and long life. The most widely used sensorless control method based on backEMF is an important trend in the development of brushless DC motor. In this paper, a new starting method for brushless DC motor (BLDCM) is proposed, which is insensitive to the detection of the backEMF method in the static starting process of brushless DC motor (BLDCM). In the phase of rotor initial position identification, the rotor is easily and effectively located from unknown position to the target position by using the three-phase turn-through secondary positioning method, which has good stability. In the stage of motor acceleration, the blind area is detected by the backEMF method. By using the open-loop acceleration method of several beats, the motor accelerates to the speed threshold which can be accurately detected by the backEMF method in a short period of time. In the phase of low speed running of motor, the method of backEMF is not sensitive to detection. By analyzing quantitatively and qualitatively the relationship between the non-conductive phase and inductive EMF, a method for detecting the zero crossing of inductive EMF is designed. In the realization of the circuit, the junction FET is skillfully used to divide the voltage, and the suitable small resistance is used to increase the induction potential. The experiment shows that the zero-crossing detection accuracy is high and the anti-interference property is high. The detection range of sensorless brushless DC motor at low speed is improved. Motor high-speed operation phase, switching to the back EMF zero-crossing detection. Finally, the hardware platform of brushless DC motor control system based on PIC MCU and the software platform of brushless DC motor control system based on MPLAB IDE are built. Through the software and hardware control platform, it is proved that the new startup method has the characteristics of fast start, low speed operation stability and feasibility under constant load condition.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM33;TP212

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