Manuel Rietz;Qiya Shu;Hakim El Bahi;Jonathan Raisin;Reinhold Kneer;Hossein Askarizadeh
{"title":"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","authors":"Manuel Rietz;Qiya Shu;Hakim El Bahi;Jonathan Raisin;Reinhold Kneer;Hossein Askarizadeh","doi":"10.1109/TMAG.2025.3564337","DOIUrl":null,"url":null,"abstract":"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.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 7","pages":"1-10"},"PeriodicalIF":1.9000,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Direct Cooling of Stator End-Windings Using Ferrofluids: An Exploratory Experimental Study on Flow Dynamics and Heat Transfer\",\"authors\":\"Manuel Rietz;Qiya Shu;Hakim El Bahi;Jonathan Raisin;Reinhold Kneer;Hossein Askarizadeh\",\"doi\":\"10.1109/TMAG.2025.3564337\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"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.\",\"PeriodicalId\":13405,\"journal\":{\"name\":\"IEEE Transactions on Magnetics\",\"volume\":\"61 7\",\"pages\":\"1-10\"},\"PeriodicalIF\":1.9000,\"publicationDate\":\"2025-04-25\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"IEEE Transactions on Magnetics\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://ieeexplore.ieee.org/document/10976992/\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, ELECTRICAL & ELECTRONIC\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Magnetics","FirstCategoryId":"5","ListUrlMain":"https://ieeexplore.ieee.org/document/10976992/","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
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.
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.