本文選題：真空泵 + 永磁同步電動(dòng)機(jī)　； 參考：《沈陽工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著我國科學(xué)技術(shù)水平不斷的提高,越來越多的行業(yè)需要真空環(huán)境進(jìn)行生產(chǎn)作業(yè),對真空泵的需求量越來越大。傳統(tǒng)真空泵都是采用異步電動(dòng)機(jī),由異步電動(dòng)機(jī)的運(yùn)行特性可知,轉(zhuǎn)子鋁耗使得轉(zhuǎn)子的溫度升高。由于屏蔽套內(nèi)為高真空狀態(tài),失去了熱對流的散熱條件,轉(zhuǎn)子只能通過熱傳導(dǎo)和熱輻射進(jìn)行散熱,轉(zhuǎn)子溫度越來越高,熱量通過熱傳導(dǎo)傳遞給軸承,使得軸承內(nèi)圈溫度升高。由于軸承內(nèi)外圈散熱條件不同,使得軸承內(nèi)圈的溫度遠(yuǎn)高于外圈的溫度,內(nèi)外圈發(fā)生不同程度的膨脹,軸承的有效游隙減小,長時(shí)間運(yùn)行下來,經(jīng)歷漫長的動(dòng)態(tài)過渡過程,軸承滾道內(nèi)潤滑油油膜難以建立,滾動(dòng)球體受到擠壓,最終可能導(dǎo)致軸承因滾動(dòng)球體摩擦力過大而膠合抱死,后果不堪設(shè)想。本文通過設(shè)計(jì)真空泵用永磁同步電動(dòng)機(jī),來解決傳統(tǒng)真空泵轉(zhuǎn)子溫度過高,軸承內(nèi)外圈溫度差較大,運(yùn)行穩(wěn)定性較差等問題。首先,對真空泵的結(jié)構(gòu)特征進(jìn)行介紹,根據(jù)屏蔽電動(dòng)機(jī)的設(shè)計(jì)特點(diǎn),對真空泵用異步電動(dòng)機(jī)的轉(zhuǎn)子結(jié)構(gòu)進(jìn)行改造,設(shè)計(jì)真空泵用永磁同步電動(dòng)機(jī),采用有限元分析軟件Ansoft進(jìn)行電磁場仿真計(jì)算,驗(yàn)證其電磁設(shè)計(jì)的合理性,對比分析真空泵用永磁同步電動(dòng)機(jī)和真空泵用異步電動(dòng)機(jī)的性能特性。然后,將真空泵用永磁同步電動(dòng)機(jī)各部分損耗作為溫度場的負(fù)荷,利用有限元分析軟件Ansys workbench分析其溫度場,對比分析真空泵用永磁同步電動(dòng)機(jī)與真空泵用異步電動(dòng)機(jī)屏蔽套、轉(zhuǎn)子和軸承的溫度場分布特性。為了進(jìn)一步提高真空泵用永磁同步電動(dòng)機(jī)的穩(wěn)定性,在轉(zhuǎn)子和轉(zhuǎn)軸表面進(jìn)行處理,提高其輻射率,并進(jìn)行對比分析。最后,將溫度場作為熱負(fù)荷,加載到應(yīng)力場中,仿真計(jì)算三種結(jié)構(gòu)的真空泵用屏蔽電動(dòng)機(jī)屏蔽套和軸承的應(yīng)力場分布特性,并且進(jìn)行對比分析,得出結(jié)論。通過仿真分析可以得出真空泵用永磁同步電動(dòng)機(jī)性能優(yōu)于真空泵用異步電動(dòng)機(jī),并且可以有效的提高真空泵運(yùn)行的穩(wěn)定性和可靠性。當(dāng)轉(zhuǎn)子和轉(zhuǎn)軸表面進(jìn)行處理后,提高其輻射率,真空泵用永磁同步電動(dòng)機(jī)效果更加明顯。對真空泵用驅(qū)動(dòng)電動(dòng)機(jī)進(jìn)行實(shí)驗(yàn)測試,通過對實(shí)驗(yàn)數(shù)據(jù)的整理,驗(yàn)證仿真分析的可靠性。
[Abstract]:With the development of science and technology in our country, more and more industries need vacuum environment to operate, and the demand for vacuum pump is increasing. The traditional vacuum pump uses asynchronous motor. According to the operating characteristics of the asynchronous motor, the rotor temperature is increased by the aluminum consumption of the rotor. Because of the high vacuum state in the shield sleeve, the heat dissipation condition of heat convection is lost, the rotor can only dissipate heat through heat conduction and heat radiation. The temperature of rotor is higher and higher, and the heat is transferred to the bearing through heat conduction, which makes the temperature of the inner ring of the bearing rise. Because of the different heat dissipation conditions of the inner ring of the bearing, the temperature of the inner ring of the bearing is much higher than that of the outer ring, and the inner ring of the bearing expands in varying degrees, the effective clearance of the bearing decreases, the bearing runs down for a long time, and it goes through a long process of dynamic transition. The lubricating oil film in the bearing raceway is difficult to establish and the rolling ball is squeezed, which may result in the bearing being glued and locked because of the excessive friction of the rolling ball, and the consequences are unimaginable. In this paper, the permanent magnet synchronous motor used in vacuum pump is designed to solve the problems of high rotor temperature, large temperature difference of bearing inner ring and outer ring, and poor operation stability of traditional vacuum pump. First of all, the structural characteristics of vacuum pump are introduced. According to the design characteristics of shielded motor, the rotor structure of asynchronous motor for vacuum pump is reformed, and the permanent magnet synchronous motor for vacuum pump is designed. Finite element analysis software Ansoft is used to simulate electromagnetic field to verify the rationality of electromagnetic design. The performance characteristics of permanent magnet synchronous motor for vacuum pump and asynchronous motor for vacuum pump are compared and analyzed. Then, the loss of permanent magnet synchronous motor (PMSM) for vacuum pump is taken as the load of temperature field, and the temperature field is analyzed by finite element analysis software Ansys workbench, and the shielding sleeve of PMSM for vacuum pump and asynchronous motor for vacuum pump is compared and analyzed. Temperature field distribution characteristics of rotor and bearing. In order to improve the stability of permanent magnet synchronous motor (PMSM) for vacuum pump, the surface of rotor and shaft is treated to improve the emissivity. Finally, the temperature field is taken as the thermal load and loaded into the stress field, and the stress field distribution characteristics of shielding motor shield sleeve and bearing for three types of vacuum pump are simulated and analyzed, and a conclusion is drawn. The simulation results show that the performance of permanent magnet synchronous motor for vacuum pump is better than that of asynchronous motor for vacuum pump, and the stability and reliability of vacuum pump can be improved effectively. When the surface of rotor and shaft is treated, the emissivity of permanent magnet synchronous motor for vacuum pump is improved. The reliability of the simulation analysis is verified by sorting out the experimental data of the vacuum pump driving motor.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM341;TB752

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