發(fā)布時間：2018-08-06 18:07

【摘要】：化石能源的匱乏以及環(huán)境污染問題的日趨嚴重,促進了新能源技術(shù)的高速發(fā)展。風能以其資源豐富、可再生、清潔無污染等一系列優(yōu)點開始得到重視,而且在所有可再生能源利用技術(shù)中,風力發(fā)電是最成熟、最具規(guī)�；蜕虡I(yè)開發(fā)前景的,風電技術(shù)由此迅速發(fā)展。雙定子無刷雙饋發(fā)電機作為一種新型交流發(fā)電機,具有無刷可靠、可直驅(qū)、變頻容量小、變速恒頻和運行方式多樣化的優(yōu)點,在風電領(lǐng)域具有廣闊的應用前景。本文以3MW雙定子無刷雙饋發(fā)電機為研究對象,對雙定子無刷雙饋發(fā)電機進行整體結(jié)構(gòu)設計,并對重要結(jié)構(gòu)進行結(jié)構(gòu)優(yōu)化。本文主要工作內(nèi)容如下:首先,本文在深入研究不同風力發(fā)電機結(jié)構(gòu)的基礎上,根據(jù)雙定子無刷雙饋發(fā)電機的特殊性對其進行整體結(jié)構(gòu)設計,并對一些重要結(jié)構(gòu)和結(jié)構(gòu)連接方式進行了分析。其次,對隔磁環(huán)和靜止軸進行結(jié)構(gòu)優(yōu)化。在對隔磁環(huán)燕尾槽尺寸進行優(yōu)化的基礎上,對隔磁環(huán)進行尺寸優(yōu)化以減輕重量、降低制造成本。靜止軸由于整體尺寸較大,實心靜止軸的心部結(jié)構(gòu)受力太小,無法有效利用心部材料,故采用空心軸結(jié)構(gòu),并對其進行尺寸優(yōu)化分析,使其達到強度要求。最后,對前軸法蘭盤、后支撐盤和內(nèi)定子支撐盤進行結(jié)構(gòu)優(yōu)化。在對前軸法蘭盤進行拓撲優(yōu)化的基礎上,對前軸法蘭盤的結(jié)構(gòu)參數(shù)進行靈敏度分析,選出重要結(jié)構(gòu)參數(shù)對前軸法蘭盤進行尺寸優(yōu)化。后支撐盤作為轉(zhuǎn)子端部重要的支撐結(jié)構(gòu),其設計好壞直接影響氣隙的平衡性,對后支撐盤進行尺寸優(yōu)化,使其達到一定的剛強度要求。為提高由隔磁環(huán)、前軸法蘭盤和后支撐盤組成的轉(zhuǎn)子核心結(jié)構(gòu)的一階模態(tài)頻率,對前軸法蘭盤和后支撐盤加不同數(shù)量加強筋的方案進行對比分析,并選出最優(yōu)方案,以提高轉(zhuǎn)子核心結(jié)構(gòu)的一階模態(tài)頻率。對內(nèi)定子支撐盤進行結(jié)構(gòu)優(yōu)化,以降低其重量并提高其一階模態(tài)頻率。本文對兆瓦級直驅(qū)式雙定子無刷雙饋發(fā)電機的整體結(jié)構(gòu)設計及結(jié)構(gòu)優(yōu)化進行了較為系統(tǒng)的研究,對大型風力發(fā)電機結(jié)構(gòu)設計及結(jié)構(gòu)優(yōu)化具有重要的借鑒意義和工程實用價值。
[Abstract]:The shortage of fossil energy and the increasingly serious problem of environmental pollution promote the rapid development of new energy technology. Wind energy is getting more and more attention because of its rich resources, renewable, clean and pollution-free, and wind power generation is the most mature, large-scale and commercial development of all renewable energy utilization technologies. Wind power technology has developed rapidly. As a new type of alternator, double-stator brushless doubly-fed generator has the advantages of brushless reliability, direct-drive, small frequency conversion capacity, variable speed constant frequency and diversified operation mode. It has a broad application prospect in the field of wind power. In this paper, the 3MW double stator brushless doubly-fed generator is taken as the research object, the whole structure of the double-stator brushless doubly-fed generator is designed, and the important structure is optimized. The main work of this paper is as follows: firstly, based on the in-depth study of different wind turbine structures, the paper designs the whole structure of the double-stator brushless doubly-fed generator according to its particularity. Some important structures and structural connections are analyzed. Secondly, the structure of the isolated magnetic ring and the static axis are optimized. Based on the optimization of the size of the swallowtail slot, the size of the spacer ring is optimized to reduce the weight and the manufacturing cost. Because of the large size of the static shaft and the small force on the core structure of the solid static shaft, the hollow shaft structure is adopted and the size optimization analysis is carried out to make it meet the strength requirement. Finally, the structure of the front flange, the rear supporting disk and the inner stator supporting disk are optimized. Based on the topology optimization of the front flange, the sensitivity analysis of the structural parameters of the front flange is carried out, and the important structural parameters are selected to optimize the size of the front flange. As an important supporting structure at the end of the rotor, the design of the rear support disk directly affects the balance of the air gap. The size of the rear support disk is optimized to meet the rigid strength requirements. In order to improve the first order modal frequency of rotor core structure composed of magnetic ring, front shaft flange and rear support plate, the scheme of adding different amount of stiffeners to front shaft flange and rear support plate was compared and analyzed, and the optimum scheme was selected. In order to improve the first order modal frequency of rotor core structure. The structure of the inner stator support disk is optimized to reduce its weight and increase its first mode frequency. In this paper, the overall structure design and structural optimization of a megawatt type direct-drive double-stator brushless doubly-fed generator are studied systematically, which is of great significance and practical value for the structural design and optimization of large wind turbine.
【學位授予單位】：沈陽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM315

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本文編號：2168558