本文選題：中型高壓異步電動(dòng)機(jī) + 流體場(chǎng)��； 參考：《哈爾濱理工大學(xué)》2015年碩士論文

【摘要】：20世紀(jì)90年代，我國(guó)設(shè)計(jì)了YKK系列中型高壓感應(yīng)電動(dòng)機(jī)，它具有高效、節(jié)能、噪聲低、振動(dòng)小、性能可靠等優(yōu)點(diǎn)。它可以驅(qū)動(dòng)通風(fēng)機(jī)、壓縮機(jī)、水泵、破碎機(jī)、切削機(jī)床等其他機(jī)械，也可以作為原動(dòng)機(jī)廣泛的應(yīng)用于煤礦、機(jī)械工業(yè)、發(fā)電廠及各種工礦企業(yè)中。由于這種封閉式交流異步電機(jī)的結(jié)構(gòu)較為復(fù)雜，故溫升一直是該電機(jī)運(yùn)行時(shí)需要關(guān)注的重點(diǎn)問題之一。 YKK系列中型高壓異步電動(dòng)機(jī)的冷卻系統(tǒng)采用了軸徑向混合通風(fēng)的方式，在電機(jī)內(nèi)部分布著徑向通風(fēng)溝，電機(jī)運(yùn)行時(shí)旋轉(zhuǎn)的轉(zhuǎn)子導(dǎo)致通風(fēng)溝內(nèi)流體的流動(dòng)情況非常復(fù)雜。在實(shí)際計(jì)算中，大部分人選擇對(duì)通風(fēng)溝內(nèi)流體的流動(dòng)進(jìn)行簡(jiǎn)化，這種處理方法雖然便捷了計(jì)算，但得到的結(jié)果卻與實(shí)際情況有比較大的偏差，大大降低了溫度場(chǎng)計(jì)算的準(zhǔn)確性。 本文分析了YKK系列電機(jī)通風(fēng)冷卻系統(tǒng)的特點(diǎn)，以一臺(tái)YKK450-4、500kW中型高壓異步電動(dòng)機(jī)為例，，依據(jù)電機(jī)實(shí)際結(jié)構(gòu)的尺寸，建立了內(nèi)風(fēng)路流體場(chǎng)的物理模型；基于流體力學(xué)和傳熱學(xué)理論對(duì)電機(jī)的實(shí)際運(yùn)行情況進(jìn)行分析，給出適合的假設(shè)條件及邊界條件；對(duì)電機(jī)內(nèi)流體場(chǎng)進(jìn)行仿真計(jì)算，得到了計(jì)算區(qū)域的流體場(chǎng)、壓力分布云圖及每個(gè)通風(fēng)溝內(nèi)的流量分布；采用流體場(chǎng)溫度場(chǎng)耦合的算法對(duì)電機(jī)內(nèi)部的溫度場(chǎng)進(jìn)行分析計(jì)算；重新對(duì)改變通風(fēng)槽鋼、通風(fēng)槽管安裝位置的通風(fēng)溝進(jìn)行建模，得到幾種不同情況下電機(jī)內(nèi)部的溫度場(chǎng)分布。 本文較為準(zhǔn)確的計(jì)算出電機(jī)穩(wěn)定運(yùn)行時(shí)其內(nèi)部的流體場(chǎng)與溫度場(chǎng)的分布情況，仿真結(jié)果與實(shí)驗(yàn)數(shù)據(jù)的對(duì)比證明了計(jì)算模型的合理性及準(zhǔn)確性，同時(shí)對(duì)通風(fēng)槽鋼的安裝位置提出了改進(jìn)建議，研究結(jié)果為提高電機(jī)的散熱性能、優(yōu)化電機(jī)的通風(fēng)結(jié)構(gòu)提供了理論依據(jù)。
[Abstract]:In the 1990s, YKK series medium high voltage induction motors were designed in China. It has the advantages of high efficiency, energy saving, low noise, low vibration, reliable performance and so on. It can drive fans, compressors, pumps, crushers, cutting machines and other machinery, but also can be used as prime movers in coal mines, mechanical industry, power plants and various industrial and mining enterprises. Because the structure of this closed AC asynchronous motor is more complex, Therefore, temperature rise has always been one of the most important problems in the operation of the motor. The cooling system of YKK series medium high voltage asynchronous motor adopts axial and radial mixed ventilation, and the radial ventilation ditch is distributed inside the motor. The flow of fluid in the ventilation ditch is very complicated due to the rotating rotor when the motor is running. In the actual calculation, most people choose to simplify the flow of fluid in the ventilation ditch. Although this treatment method is convenient to calculate, the results obtained are quite different from the actual situation, which greatly reduces the accuracy of the calculation of temperature field. The characteristics of ventilation cooling system of YKK series motors are analyzed in this paper. Taking a YKK 450-4500kW medium high voltage asynchronous motor as an example, the physical model of the fluid field in the inner air path is established according to the size of the actual structure of the motor. Based on the theory of fluid mechanics and heat transfer, the actual operation of the motor is analyzed, and the suitable hypothetical conditions and boundary conditions are given, the fluid field in the motor is simulated and the fluid field in the calculation area is obtained. Pressure distribution cloud diagram and flow distribution in each ventilation ditch; analysis and calculation of internal temperature field of motor using fluid field temperature field coupling algorithm; modeling of ventilation ditch with changing ventilation channel steel and installation position of ventilation groove pipe, The temperature field distribution inside the motor is obtained under several different conditions. In this paper, the distribution of fluid field and temperature field inside the motor is calculated accurately when the motor is running stably. The comparison between the simulation results and the experimental data proves the rationality and accuracy of the calculation model. At the same time, suggestions for improving the installation position of the ventilation channel steel are put forward. The research results provide a theoretical basis for improving the heat dissipation performance of the motor and optimizing the ventilation structure of the motor.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM343

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本文編號(hào)：2085988