【摘要】：目前,渦旋真空屏蔽泵在國(guó)內(nèi)比較少見,常見的傳統(tǒng)結(jié)構(gòu)渦旋真空泵泵頭與電機(jī)以軸承機(jī)械密封,漏率較高。當(dāng)渦旋真空泵用于傳輸有毒有害介質(zhì)式時(shí),容易污染工作環(huán)境。首先,本課題從4L渦旋真空泵用屏蔽電機(jī)的設(shè)計(jì)出發(fā),總結(jié)了屏蔽電機(jī)的設(shè)計(jì)特點(diǎn),對(duì)屏蔽套渦流損耗的計(jì)算方法進(jìn)行了推導(dǎo)。歸納了一種以Ansoft軟件輔助設(shè)計(jì)為基礎(chǔ)的屏蔽電機(jī)電磁設(shè)計(jì)流程。分別針對(duì)采用導(dǎo)磁材料Sus430屏蔽套和不導(dǎo)磁材料Sus321屏蔽套設(shè)計(jì)了兩套電磁方案,并進(jìn)行有限元仿真。分析了分別采用兩種屏蔽套材料,在電機(jī)電磁設(shè)計(jì)上需要注意的異同點(diǎn),以及屏蔽套材料對(duì)電機(jī)工作性能的影響。其次,利用Solidworks和Ansys Workbench分別對(duì)兩套電磁方案進(jìn)行建模和溫度場(chǎng)分析,溫度場(chǎng)分析過程中認(rèn)為氣隙近似絕對(duì)真空,考慮屏蔽套內(nèi)表面與轉(zhuǎn)子外表面的熱輻射作用。仿真得到電機(jī)各部件的溫度分布圖。兩套方案套繞組溫度都略高于設(shè)計(jì)要求,Sus430屏蔽套方案較Sus321屏蔽套方案整體溫度較小。對(duì)機(jī)殼采取強(qiáng)制對(duì)流措施后,電機(jī)各部分溫度滿足設(shè)計(jì)要求。然后將穩(wěn)態(tài)溫度場(chǎng)的計(jì)算結(jié)果進(jìn)行應(yīng)力場(chǎng)耦合計(jì)算,得到兩種方案中屏蔽套的熱形變和熱應(yīng)力分布特性。綜合以上分析結(jié)果,可知兩套設(shè)計(jì)方案均能達(dá)到設(shè)計(jì)要求,Sus430屏蔽套方案在電樞電流、起動(dòng)轉(zhuǎn)矩、最大轉(zhuǎn)矩、效率、功率因數(shù)和溫升方面表現(xiàn)較好。最后,建立了一個(gè)屏蔽電機(jī)的簡(jiǎn)化模型,分析氣隙中熱輻射和稀薄氣體熱傳導(dǎo)兩種熱量傳遞作用隨氣隙真空度變化的規(guī)律。對(duì)簡(jiǎn)化模型分析可知,隨著氣隙真空度由接近絕對(duì)真空到一個(gè)標(biāo)準(zhǔn)大氣壓變化的過程中,一開始熱輻射起主要作用,隨著壓強(qiáng)變大,空氣熱導(dǎo)率增加,由空氣熱傳導(dǎo)引起的熱流密度逐漸增加,由熱輻射引起的熱流密度逐漸減小�？偀崃髅芏鹊淖兓噬仙厔�(shì),屏蔽套內(nèi)表面與轉(zhuǎn)子鐵心外表面之間的溫度差減小。對(duì)于真空屏蔽電機(jī)的溫度場(chǎng)分析,當(dāng)把屏蔽套內(nèi)表面作為絕熱面,計(jì)算得到的屏蔽套內(nèi)表面和轉(zhuǎn)子鐵心外表面溫度相差較大時(shí),需要考慮氣隙中的熱量傳遞作用。
[Abstract]:At present, vortex vacuum shielding pump is rare in China. The traditional structure of vortex vacuum pump head and motor with bearing mechanical seal, leakage rate is higher. When the vortex vacuum pump is used to transfer toxic and harmful medium, it is easy to pollute the working environment. Firstly, based on the design of the shielded motor for 4L vortex vacuum pump, the design characteristics of the shield motor are summarized, and the calculation method of the eddy current loss of the shield sleeve is deduced. An electromagnetic design flow of shielded motor based on Ansoft software aided design is summarized. Two sets of electromagnetic schemes are designed for magnetic conduction material Sus430 shield sleeve and unmagnetic material Sus321 shield sleeve respectively, and the finite element simulation is carried out. In this paper, the similarities and differences of two kinds of shielding sleeve materials in the electromagnetic design of the motor are analyzed respectively, and the influence of the shielding sleeve materials on the working performance of the motor is also analyzed. Secondly, Solidworks and Ansys Workbench are used to model and analyze the temperature field of the two sets of electromagnetic schemes respectively. In the process of temperature field analysis, the air gap is considered as an absolute vacuum, and the thermal radiation between the inner surface of the shield sleeve and the outer surface of the rotor is considered. The temperature distribution of each part of the motor is obtained by simulation. The winding temperature of the two sets of schemes is slightly higher than that of the design requirements. The overall temperature of the two schemes is lower than that of the Sus321 shielding sleeve scheme. After the forced convection measures are taken on the housing, the temperature of each part of the motor meets the design requirements. Then the calculation results of steady temperature field are coupled with the stress field to obtain the thermal deformation and thermal stress distribution characteristics of the shielding sleeve in the two schemes. Combined with the above analysis results, it can be seen that both sets of design schemes can meet the design requirements. The two sets of design schemes show good performance in armature current, starting torque, maximum torque, efficiency, power factor and temperature rise. Finally, a simplified model of shielded motor is established to analyze the variation of heat transfer between air gap and rarefied gas with air gap vacuum. The analysis of the simplified model shows that with the change of air gap vacuum from an absolute vacuum to a standard atmospheric pressure, the thermal radiation plays a major role at the beginning, and with the increase of the pressure, the thermal conductivity of the air increases. The heat flux caused by air heat conduction increases gradually, and the heat flux caused by heat radiation decreases gradually. The change of total heat flux shows an upward trend, and the temperature difference between the inner surface of the shield sleeve and the outer surface of the rotor iron core decreases. For the analysis of the temperature field of vacuum shielded motor, when the inner surface of the shield sleeve is taken as the adiabatic surface and the temperature difference between the inner surface of the shield sleeve and the outer surface of the rotor iron core is large, the heat transfer in the air gap should be considered.
【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)】：TB752;TM32

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