本文選題：永磁調(diào)速器　切入點(diǎn)：霧化冷卻　出處：《西安石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：永磁調(diào)速器因?yàn)槠浣Y(jié)構(gòu)簡(jiǎn)單、非機(jī)械連接,對(duì)中性要求低,可實(shí)現(xiàn)軟啟動(dòng)、環(huán)境適應(yīng)性強(qiáng)等優(yōu)點(diǎn),成為繼液力耦合調(diào)速器與變頻調(diào)速器之后新的電機(jī)調(diào)速裝置的研究熱點(diǎn)。永磁調(diào)速器優(yōu)點(diǎn)突出,但是在運(yùn)行過(guò)程中,由于特殊的工作原理,具有不可避免的溫升問(wèn)題。而永磁材料的磁性隨著溫度的升高而降低,當(dāng)溫度高于永磁材料的居里溫度之后,會(huì)發(fā)生不可逆退磁。為了維護(hù)永磁調(diào)速器的使用性能以及延長(zhǎng)其使用壽命,必須采取有效的降溫措施�，F(xiàn)有的冷卻方式各有缺陷,而霧化冷卻被稱為當(dāng)今最有發(fā)展前景的冷卻方式,本文將該技術(shù)應(yīng)用到永磁調(diào)速器的降溫冷卻中。本文通過(guò)Fluent數(shù)值仿真對(duì)永磁調(diào)速器的霧化冷卻技術(shù)進(jìn)行研究。首先對(duì)永磁調(diào)速器單噴嘴霧化冷卻模型簡(jiǎn)進(jìn)行數(shù)值模擬,在該模型中研究了噴嘴距永磁體的距離、噴嘴入口的壓力、水的質(zhì)量流量、噴嘴內(nèi)部液膜的厚度對(duì)單個(gè)噴嘴霧化特性的影響,從而確定噴嘴相關(guān)參數(shù)設(shè)置,并應(yīng)用到永磁調(diào)速器多噴嘴的霧化冷卻模型中。由于永磁調(diào)速器結(jié)構(gòu)較大,單個(gè)噴嘴的冷卻效果對(duì)于大功率永磁調(diào)速器的降溫效果十分有限。本文就永磁調(diào)速器模型提出了三種多噴嘴設(shè)置方案:等直徑環(huán)向均勻分布、徑向分布、以及變直徑環(huán)向均勻分布。變直徑環(huán)向均勻分布在方案設(shè)置上彌補(bǔ)了前兩者受結(jié)構(gòu)尺寸限制的不足。通過(guò)模擬計(jì)算發(fā)現(xiàn)由于徑向分布時(shí)有大量的液滴噴灑在永磁體形成的環(huán)形空間內(nèi)部,在旋轉(zhuǎn)氣流的作用下,液滴受離心力的作用貼近永磁體內(nèi)壁運(yùn)動(dòng),有利于冷卻降溫,因此冷卻效果最為顯著;而非等直徑均勻分布考慮的噴灑面積較多,卻在噴嘴設(shè)置過(guò)程中有個(gè)別噴嘴直接噴灑在環(huán)形空間外的區(qū)域,受到離心力的作用,液滴貼近永磁體外殼做旋轉(zhuǎn)運(yùn)動(dòng),對(duì)冷卻效果貢獻(xiàn)極少;等直徑環(huán)向均布分布的一部分液滴噴灑到永磁體環(huán)形空間內(nèi)部,一部分直接噴灑到永磁體上,還有一部分進(jìn)入環(huán)形空間以外的區(qū)域,因此冷卻效果介于前兩種設(shè)置方案之間。綜合分析,在噴嘴設(shè)置時(shí),應(yīng)盡量使噴灑區(qū)域位于永磁體形成的環(huán)形空間之內(nèi),或永磁體之上。本文的研究結(jié)果對(duì)永磁調(diào)速器的冷卻降溫提供了一種新的可能,具有十分重要的意義。
[Abstract]:The permanent magnet governor has the advantages of simple structure, non-mechanical connection, low neutral requirement, soft start, strong environmental adaptability, etc. It has become the research hotspot of the new motor speed regulating device after the hydraulic coupling governor and the frequency conversion governor. The permanent magnet governor has outstanding advantages, but in the course of operation, because of the special working principle, The magnetic properties of permanent magnetic materials decrease with the increase of temperature, when the temperature is higher than the Curie temperature of the permanent magnet, Irreversible demagnetization will occur. In order to maintain the performance of the permanent magnet governor and prolong its service life, effective cooling measures must be taken. And atomization cooling is known as the most promising cooling method. In this paper, the technology is applied to the cooling of permanent magnet governor. In this paper, the atomization cooling technology of permanent magnet governor is studied by Fluent numerical simulation. Firstly, the model of atomization cooling of single nozzle of permanent magnet governor is numerically simulated. In this model, the influence of the distance from the nozzle to the permanent magnet, the pressure at the nozzle inlet, the mass flow of water and the thickness of the liquid film inside the nozzle on the atomization characteristics of a single nozzle are studied. And it is applied to the atomization cooling model of permanent magnet governor with multiple nozzles. Because of the large structure of permanent magnet governor, The cooling effect of single nozzle is very limited to the cooling effect of high power permanent magnet governor. In this paper, three kinds of multiple nozzles are put forward for the model of permanent magnet governor: uniform distribution of equal diameter and radial distribution. The uniform distribution of variable diameter annulus makes up for the limitation of the former two by the structure size. It is found by simulation that a large number of droplets are sprayed on permanent magnet due to radial distribution. Inside the annular space formed by the body, Under the action of rotating airflow, the droplet is close to the inner wall of the permanent magnet by centrifugal force, which is beneficial to cooling and cooling, so the cooling effect is the most remarkable. However, in the process of setting the nozzle, some nozzles are sprayed directly outside the ring space, which is affected by centrifugal force, and the droplet moves close to the permanent magnet shell, which makes little contribution to the cooling effect. A portion of the droplets distributed in a uniform circular direction of equal diameter are sprayed inside the ring space of the permanent magnet, some directly on the permanent magnet, and another part into an area outside the ring space. Therefore, the cooling effect is between the first two settings. When the nozzle is set, the spray area should be located in the ring space formed by the permanent magnet. The results of this paper provide a new possibility for the cooling and cooling of permanent magnet governor and are of great significance.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH139;TE65

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1 賀彥霖;永磁調(diào)速器的霧化冷卻技術(shù)研究[D];西安石油大學(xué);2017年

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本文編號(hào)：1573825