{"title":"Numerical and Experimental Methods to Estimate Eddy-Current Losses in Grooved Solid Rotors as Used in Synchronous Machines","authors":"Matteo Olivo;Cesare Ciriani;Mario Mezzarobba;Alberto Tessarolo;Paolo Bolognesi","doi":"10.1109/TMAG.2025.3605077","DOIUrl":null,"url":null,"abstract":"Large synchronous machines designed for high-speed operation often feature a solid rotor construction that guarantees the needed robustness against centrifugal forces. The rotor solid steel is exposed to air-gap field ripples due to stator slotting, which cause eddy currents possibly leading to overheating and efficiency issues. Milling circumferential grooves in the solid-pole surface is a common provision to limit such eddy currents. This article proposes a methodology to investigate the effect of grooving on rotor losses using either suited experimental tests or finite element analysis (FEA) of a 3-D model tailored to minimize the computational burden. Such methodology is applied to a custom prototype device, obtaining a good accordance between the results provided by the two independent approaches. This confirms the validity of the proposed solution, which can thus be used to investigate and optimize application-related designs.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 10","pages":"1-12"},"PeriodicalIF":1.9000,"publicationDate":"2025-09-02","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/11146923/","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}
引用次数: 0
Abstract
Large synchronous machines designed for high-speed operation often feature a solid rotor construction that guarantees the needed robustness against centrifugal forces. The rotor solid steel is exposed to air-gap field ripples due to stator slotting, which cause eddy currents possibly leading to overheating and efficiency issues. Milling circumferential grooves in the solid-pole surface is a common provision to limit such eddy currents. This article proposes a methodology to investigate the effect of grooving on rotor losses using either suited experimental tests or finite element analysis (FEA) of a 3-D model tailored to minimize the computational burden. Such methodology is applied to a custom prototype device, obtaining a good accordance between the results provided by the two independent approaches. This confirms the validity of the proposed solution, which can thus be used to investigate and optimize application-related designs.
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.