【摘要】：皮帶傳動一體化起動發(fā)電機(Belt-driven Starter Generator,BSG)起停系統(tǒng)可減少發(fā)動機怠速運行時間進而降低油耗和尾氣排放。交錯磁極無刷直流起動發(fā)電機是一種電動勢為梯形波、轉(zhuǎn)子側(cè)有永磁體、定子側(cè)有直流勵磁繞組的混合勵磁電機,具有氣隙磁密調(diào)節(jié)范圍大、功率密度高、轉(zhuǎn)矩密度高、控制簡單等優(yōu)點,適用于高起動轉(zhuǎn)矩和寬轉(zhuǎn)速范圍高效恒壓發(fā)電要求的BSG起停系統(tǒng)。目前,該結(jié)構(gòu)電機的相關(guān)研究較少且不夠深入,為此本文對其電磁性能進行了如下研究。首先,采用有限元方法分析了電勵磁磁場與永磁磁場的耦合關(guān)系以及負載時電樞磁場對以上兩種磁場的影響,并基于磁場分析結(jié)果采用路計算方法推導(dǎo)了每極磁通的計算公式,分析了換相和電動勢波形為非理想梯形波對電磁轉(zhuǎn)矩的影響,用一臺2kW樣機實驗驗證了每極磁通和電磁轉(zhuǎn)矩計算公式的準確性。其次,采用場路結(jié)合的方法分析了每極合成氣隙磁密和單極側(cè)氣隙磁密的分布特點,并針對單極側(cè)氣隙磁密分布不對稱的特點提出一種低成本的六霍爾傳感器轉(zhuǎn)子位置檢測方法,該方法對六個霍爾傳感器的輸出信號進行了分組和邏輯運算,得到邏輯運算后的信號與傳統(tǒng)無刷直流電動機霍爾信號特征一樣。實驗表明了關(guān)于單極側(cè)氣隙磁密分布特點分析的正確性和所提六霍爾傳感器轉(zhuǎn)子位置檢測方法的適用性。最后,基于相繞組電壓推導(dǎo)了母線電壓與母線電流、勵磁電流的關(guān)系式。不可控整流時電樞電流有換流過程,使相電流平均值與母線電流平均值不相等,對電樞電流換流過程及其對母線電壓的影響進行分析,得到計入換流影響的母線電壓表達式,實驗驗證了該母線電壓計算公式的準確性。
[Abstract]:The Belt-driven Starter Generator (BSG) starting and stopping system can reduce the engine idle running time and reduce the fuel consumption and exhaust emissions. The staggered pole brushless DC starting generator is a hybrid excitation motor with a trapezoid wave, a permanent magnet on the rotor side, and a DC excitation winding on the stator side. It has the advantages of large air gap magnetic density adjustment range, high power density, high torque density, simple control and so on. It is suitable for BSG starting and stopping system with high starting torque and high speed constant voltage power generation requirements. At present, the related research of the structure motor is less and not deep enough. The finite element method is used to analyze the coupling relationship between the magnetic field and the permanent magnetic field, and the influence of the armature magnetic field on the two kinds of magnetic fields when the load is loaded. Based on the result of the magnetic field analysis, the calculation formula of each pole magnetic flux is derived. The influence of the commutation and EMF wave on the electromagnetic torque is analyzed. The accuracy of the calculation formula for each pole flux and electromagnetic torque is verified by the experiment of the platform 2kW prototype. Secondly, the distribution characteristics of the magnetic density and the air gap magnetic density in each polar air gap are analyzed by the method of field circuit combination, and a low cost six Holzer sensor rotor position detection is proposed in view of the asymmetry of the magnetic density distribution of the air gap in the unipolar side air gap. The method is used to group and logic the output signals of six Holzer sensors. The signal after the logic operation is the same as that of the traditional brushless DC motor Holzer signal. The experiment shows the correctness of the analysis of the magnetic density distribution characteristics of the air gap in the monopole side and the detection method of the rotor position of the six Holzer sensor. Finally, based on the phase winding voltage, the relationship between the bus voltage and the busbar current and the excitation current is derived. The armature current has a commutation process when the uncontrollable rectifier is controlled. The average value of the phase current is not equal to the average of the busbar current, and the influence of the armature current exchange process and the voltage of the bus is analyzed, and the influence of the commutation is taken into account. The bus voltage formula is used to verify the accuracy of the bus voltage calculation formula.
【學(xué)位授予單位】：北京工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U463.631

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本文編號：2128466