【摘要】：隨著電動汽車用驅(qū)動電機(jī)對功率密度和轉(zhuǎn)矩密度的要求越來越高,電機(jī)散熱問題成為了限制電機(jī)性能提升的重要因素之一。本文針對集中繞組永磁電機(jī),給出一種新型的電機(jī)槽內(nèi)油冷結(jié)構(gòu),對過載能力較高的電機(jī),冷卻效果顯著,同時,通過優(yōu)化電機(jī)冷卻結(jié)構(gòu),進(jìn)一步增強(qiáng)電機(jī)高速工況時的冷卻效果。本文以適用于高轉(zhuǎn)矩密度集中繞組永磁電機(jī)的槽內(nèi)油冷系統(tǒng)為研究對象,對電機(jī)損耗、槽內(nèi)油冷電-磁-熱結(jié)構(gòu)設(shè)計(jì)及電機(jī)內(nèi)熱傳遞規(guī)律進(jìn)行研究。首先,從準(zhǔn)確計(jì)算電機(jī)溫度場角度出發(fā),指出在研究電機(jī)損耗時應(yīng)注意的關(guān)鍵問題,對電機(jī)鐵耗系數(shù)計(jì)算、鐵耗分布及轉(zhuǎn)子損耗抑制方法進(jìn)行研究。在此基礎(chǔ)上,利用有限元法將槽內(nèi)油冷和機(jī)殼水冷以及浸油冷卻進(jìn)行對比分析,研究槽內(nèi)油冷結(jié)構(gòu)的冷卻特點(diǎn),為后文槽內(nèi)油冷結(jié)構(gòu)設(shè)計(jì)提供指導(dǎo)。其次,對電機(jī)進(jìn)行電磁-冷卻結(jié)構(gòu)的綜合設(shè)計(jì),研究電機(jī)槽內(nèi)安裝冷卻管道,氣隙中增加隔油套筒對電機(jī)電磁性能和冷卻性能的影響。根據(jù)上述分析結(jié)果,確定槽內(nèi)油冷電機(jī)結(jié)構(gòu),利用三維有限元分析電機(jī)在不同工況下的散熱效果。再次,電機(jī)槽內(nèi)熱傳導(dǎo)規(guī)律以及電機(jī)不同工況下熱傳導(dǎo)方式的變化對電機(jī)冷卻系統(tǒng)設(shè)計(jì)意義重大。建立槽內(nèi)油冷電機(jī)單極單槽熱網(wǎng)絡(luò)模型,并與機(jī)殼水冷熱網(wǎng)絡(luò)模型進(jìn)行對比,研究兩種冷卻方式下電機(jī)熱傳遞規(guī)律。同時,結(jié)合實(shí)際樣機(jī),利用熱網(wǎng)絡(luò)模型研究電機(jī)槽內(nèi)絕緣及槽內(nèi)空氣腔對電機(jī)溫度的影響。最后,利用熱網(wǎng)絡(luò)模型和三維有限元對槽內(nèi)油冷結(jié)構(gòu)進(jìn)行優(yōu)化,主要從增強(qiáng)槽內(nèi)油冷電機(jī)高速工況散熱能力及優(yōu)化冷卻參數(shù)幾方面進(jìn)行,實(shí)現(xiàn)電機(jī)電磁性能和冷卻效果均衡較優(yōu)。
文內(nèi)圖片：
圖片說明：不同繞組端部形狀和尺寸說明
[Abstract]:With the increasing demand of the power density and torque density of the driving motor for electric vehicle, the problem of motor heat dissipation is one of the important factors to limit the performance of the motor. In this paper, a new type of oil cooling structure in the motor tank is given in this paper, and the motor with higher overload capacity is given, and the cooling effect is remarkable. At the same time, the cooling effect of the motor is further enhanced by optimizing the cooling structure of the motor. In this paper, the oil cooling system in the groove of permanent magnet motor with high torque density is used as the research object, and the loss of the motor, the electric-magnetic-heat structure of the oil in the tank and the heat transfer law of the motor are studied. First, from the point of accurately calculating the temperature field of the motor, it is pointed out that the key problems should be paid attention to in studying the loss of the motor, and the calculation of the iron loss coefficient of the motor, the distribution of the iron loss and the method for restraining the loss of the rotor are studied. On this basis, the cooling characteristics of the oil cooling structure in the tank were compared and analyzed by using the finite element method, and the cooling characteristics of the oil cooling structure in the tank were studied. Secondly, a comprehensive design of the electromagnetic-cooling structure of the electric machine is carried out, and the influence of the oil-separating sleeve on the electromagnetic performance and the cooling performance of the motor is increased in the air-gap. According to the analysis result, the structure of the oil cold motor in the tank is determined, and the heat dissipation effect of the motor under different working conditions is analyzed by the three-dimensional finite element analysis motor. Thirdly, the law of heat conduction in the motor slot and the change of the heat conduction in different working conditions of the motor are of great significance to the design of the cooling system of the motor. In this paper, the single-pole single-slot thermal network model of the oil-cooled motor in the tank is established, and the heat transfer law of the motor in two cooling modes is studied. At the same time, using the thermal network model, the influence of the air cavity on the temperature of the motor is studied by using the thermal network model. Finally, using the thermal network model and the three-dimensional finite element to optimize the oil-cooling structure in the tank, the cooling capacity of the oil-cooled motor in the tank and the optimization of the cooling parameters are mainly carried out, so that the electromagnetic performance and the cooling effect of the motor are better balanced.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM351

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