用铁磁流体直接冷却定子端部绕组:流动动力学和传热的探索性实验研究

IF 1.9 3区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Manuel Rietz;Qiya Shu;Hakim El Bahi;Jonathan Raisin;Reinhold Kneer;Hossein Askarizadeh
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引用次数: 0

摘要

高效的冷却对于高功率密度的电机是必不可少的。铁磁流体作为一种高效的冷却剂具有很高的潜力。然而,它们尚未被研究用于在撞击射流和交变磁场存在下的冷却目的。在这种结构中,铁磁流体的流动对磁场具有高度响应,这种强相互作用可以大大改善冷却过程。定子的电机线圈周围存在交变磁场。为此,建立了一套实验装置,研究了两种形式的铁磁流体射流撞击单线圈端部的冷却性能:1)水平射流垂直撞击端部;以及2)冲击端绕组顶部的垂直射流结构。两种结构均表现出相似的冷却性能,表明磁场对铁磁流体相互作用的影响比对撞击方向的影响更为显著。如果端绕组侧的磁通密度大于10 mT,并且交变频率足够小,以激发端绕组磁场与铁磁流体之间的强相互作用,则发现冷却性能有希望得到改善(高达一倍)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Direct Cooling of Stator End-Windings Using Ferrofluids: An Exploratory Experimental Study on Flow Dynamics and Heat Transfer
Efficient cooling is essential for electrical machines working with high power density. Ferrofluids offer a high potential to be served as an efficient coolant. However, they have not yet been studied for cooling purposes in an impinging jet flow and in the presence of alternating magnetic fields. In such a configuration, the ferrofluid flow is highly responsive to the magnetic field, and this strong interaction can substantially improve the cooling process. Alternating magnetic fields are present around the motor coils of a stator. In this regard, an experimental setup is built to investigate the cooling performance of two configurations of ferrofluid jet impingement onto the end-winding of a single coil: 1) the horizontal jet configuration impinging perpendicularly onto the end-winding; and 2) the vertical jet configuration impinging on the top of the end-winding. Both configurations exhibit similar cooling performances indicating the more pronounced influence of the ferrofluid flow interaction with the magnetic field compared to the influence of the impingement direction. A promising improvement of the cooling performance (up to a doubling) is found if magnetic flux densities on the side of the end-winding becomes larger than 10 mT and the alternating frequencies are sufficiently small to stimulate strong interactions between the ferrofluid flow and the magnetic fields at the end-winding.
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来源期刊
IEEE Transactions on Magnetics
IEEE Transactions on Magnetics 工程技术-工程:电子与电气
CiteScore
4.00
自引率
14.30%
发文量
565
审稿时长
4.1 months
期刊介绍: Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The IEEE Transactions on Magnetics publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.
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