【摘要】：屏蔽電泵具有完全無泄漏、安全可靠、低維修和噪音低等特點(diǎn)，但因其特殊結(jié)構(gòu)，產(chǎn)生了屏蔽套渦流損耗和軸向力問題。經(jīng)驗(yàn)公式法計(jì)算渦流損耗，有很多假設(shè)條件，計(jì)算結(jié)果誤差大，不利于提高屏蔽電機(jī)的效率和滿足工程實(shí)際的要求。對(duì)于軸向力的平衡，傳統(tǒng)的平衡孔、平衡筋和平衡鼓等方法有一定的局限性，不能實(shí)時(shí)和動(dòng)態(tài)地平衡，可能造成軸承的異常摩損，導(dǎo)致屏蔽電機(jī)無法正常工作。 首先，回顧了屏蔽電泵的發(fā)展與應(yīng)用情況，對(duì)屏蔽電機(jī)的結(jié)構(gòu)、工作原理和設(shè)計(jì)特點(diǎn)進(jìn)行了總結(jié)，給出了屏蔽套渦流損耗和轉(zhuǎn)子摩擦損耗的經(jīng)驗(yàn)計(jì)算公式，，針對(duì)一臺(tái)2極8kw的屏蔽電機(jī)進(jìn)行了電磁設(shè)計(jì)。 其次，應(yīng)用ANSOFT有限元軟件分析計(jì)算屏蔽套的渦流損耗，分析屏蔽套材料的電阻率和屏蔽套厚度對(duì)渦流損耗的影響。選擇電阻率相差較大的Sus316L不銹鋼和Hastelloy-c合金作為屏蔽套材料，研制了四種情況下的樣機(jī)，構(gòu)建實(shí)驗(yàn)系統(tǒng)進(jìn)行試驗(yàn)。根據(jù)實(shí)驗(yàn)結(jié)果，分離屏蔽套渦流損耗，并與仿真計(jì)算值和公式值對(duì)比分析，得出影響屏蔽套渦流損耗的因素，對(duì)經(jīng)驗(yàn)公式提出修正。利用ANSOFT有限元軟件對(duì)屏蔽電機(jī)進(jìn)行溫度場(chǎng)分析，得出額定負(fù)載和起動(dòng)時(shí)定轉(zhuǎn)子屏蔽套的最高溫度值，計(jì)算出相應(yīng)運(yùn)行狀態(tài)時(shí)屏蔽套的熱變形量。 最后，提出一種新型永磁無接觸式軸向力平衡新結(jié)構(gòu)，應(yīng)用有限元軟件分析計(jì)算平衡力特性，并進(jìn)行實(shí)驗(yàn)驗(yàn)證；實(shí)驗(yàn)表明，利用ANSOFT有限元軟件可以作為設(shè)計(jì)和計(jì)算新型永磁無接觸軸向力平衡結(jié)構(gòu)的有效方法。針對(duì)2極8kw屏蔽電機(jī)驅(qū)動(dòng)的流量為O=30m/h和揚(yáng)程為H=35m屏蔽電泵，分析了平衡軸向力的效果，從而確定合適的軸向力平衡裝置結(jié)構(gòu)形式和結(jié)構(gòu)參數(shù)。
[Abstract]:The shielded electric pump has the characteristics of no leakage, safety and reliability, low maintenance and low noise. However, due to its special structure, the eddy current loss and axial force of the shield sleeve are caused. The calculation of eddy current loss by empirical formula method has many hypothetical conditions, and the error of calculation result is large, which is not conducive to improving the efficiency of shield motor and meeting the requirements of engineering practice. For the balance of axial force, the traditional methods such as balancing holes, balancing bars and balancing drums have some limitations, which can not be balanced in real time and dynamically, which may cause abnormal friction loss of bearings and lead to the failure of normal operation of shield motor. Firstly, the development and application of the shielded electric pump are reviewed, the structure, working principle and design characteristics of the shielded motor are summarized, and the empirical calculation formulas of the eddy current loss and the friction loss of the rotor are given. The electromagnetic design of a 2-pole 8kw shielded motor is presented. Secondly, the eddy current loss of shield sleeve is calculated by ANSOFT finite element software, and the influence of resistivity and thickness of shield sleeve on eddy current loss is analyzed. The Sus316L stainless steel and Hastelloy-c alloy with large resistivity difference were selected as shielding sleeve materials. Four kinds of prototypes were developed and the experimental system was constructed to carry out the experiment. According to the experimental results, the eddy current loss of the shield sleeve is separated, and compared with the calculated value and the formula value, the factors affecting the eddy current loss of the shield sleeve are obtained, and the empirical formula is revised. The temperature field of the shielded motor is analyzed by using ANSOFT finite element software, the maximum temperature of the shield sleeve at rated load and starting time is obtained, and the thermal deformation of the shield sleeve in the corresponding running state is calculated. Finally, a new type of permanent magnet contactless axial force balancing structure is proposed, which is analyzed and calculated by finite element software and verified by experiments. The ANSOFT finite element software can be used as an effective method to design and calculate the new permanent magnet contactless axial force balance structure. The effect of balancing axial force is analyzed in view of the flow rate of O=30m/h driven by two-pole 8kw shielded motor and the shielded electric pump with a head of 35 m, so as to determine the appropriate structural form and structural parameters of the axial force balancing device.
【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】：2012
【分類號(hào)】：TH38

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