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The improved damping of superconductor bearings for 35 kWh superconductor flywheel energy storage system
A 35 kWh Superconductor Flywheel Energy Storage system (SFES) using hybrid bearing sets, which is composed of a high temperature superconductor (HTS) bearing and an active magnet damper (AMD), has been developed at KEPCO Research Institute (KEPRI). Damping is a source of energy loss but necessary fo...
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Published in: | Physica. C, Superconductivity Superconductivity, 2013-02, Vol.485, p.102-106 |
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container_title | Physica. C, Superconductivity |
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creator | HAN, Y. H PARK, B. J JUNG, S. Y HAN, S. C LEE, W. R BAE, Y. C |
description | A 35 kWh Superconductor Flywheel Energy Storage system (SFES) using hybrid bearing sets, which is composed of a high temperature superconductor (HTS) bearing and an active magnet damper (AMD), has been developed at KEPCO Research Institute (KEPRI). Damping is a source of energy loss but necessary for the stability of the flywheel system. We found that the damping of HTS bearings can be improved by thermal insulating bolts, which play a role of passive type external damper. To investigate the source of the increased damping, damping coefficients were measured with HTS bearings using insulating bolts made of three kinds of polymer materials. The damping coefficient was raised over 3000 N s/m in the case of PEEK bolts. The value was almost a quarter of the AMD. In this study, thermoelastic and Coulomb friction damping mechanisms are discussed. The main damping mechanism was the thermoelastic damping of the bolts themselves. And interfacial gap between the insulating bolt and metal chamber, which increased during the cooling process, was considered to be the cause of the anisotropic damping coefficients. Finally, the effects of the HTS bearings on the first critical speed are shown. |
doi_str_mv | 10.1016/j.physc.2012.11.003 |
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H ; PARK, B. J ; JUNG, S. Y ; HAN, S. C ; LEE, W. R ; BAE, Y. C</creator><creatorcontrib>HAN, Y. H ; PARK, B. J ; JUNG, S. Y ; HAN, S. C ; LEE, W. R ; BAE, Y. C</creatorcontrib><description>A 35 kWh Superconductor Flywheel Energy Storage system (SFES) using hybrid bearing sets, which is composed of a high temperature superconductor (HTS) bearing and an active magnet damper (AMD), has been developed at KEPCO Research Institute (KEPRI). Damping is a source of energy loss but necessary for the stability of the flywheel system. We found that the damping of HTS bearings can be improved by thermal insulating bolts, which play a role of passive type external damper. To investigate the source of the increased damping, damping coefficients were measured with HTS bearings using insulating bolts made of three kinds of polymer materials. The damping coefficient was raised over 3000 N s/m in the case of PEEK bolts. The value was almost a quarter of the AMD. In this study, thermoelastic and Coulomb friction damping mechanisms are discussed. The main damping mechanism was the thermoelastic damping of the bolts themselves. And interfacial gap between the insulating bolt and metal chamber, which increased during the cooling process, was considered to be the cause of the anisotropic damping coefficients. Finally, the effects of the HTS bearings on the first critical speed are shown.</description><identifier>ISSN: 0921-4534</identifier><identifier>EISSN: 1873-2143</identifier><identifier>DOI: 10.1016/j.physc.2012.11.003</identifier><language>eng</language><publisher>Amsterdam: Elsevier</publisher><subject>Applied sciences ; Bearings ; Bolts ; Damper bearings ; Damping ; Direct energy conversion and energy accumulation ; Electrical engineering. 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The value was almost a quarter of the AMD. In this study, thermoelastic and Coulomb friction damping mechanisms are discussed. The main damping mechanism was the thermoelastic damping of the bolts themselves. And interfacial gap between the insulating bolt and metal chamber, which increased during the cooling process, was considered to be the cause of the anisotropic damping coefficients. Finally, the effects of the HTS bearings on the first critical speed are shown.</description><subject>Applied sciences</subject><subject>Bearings</subject><subject>Bolts</subject><subject>Damper bearings</subject><subject>Damping</subject><subject>Direct energy conversion and energy accumulation</subject><subject>Electrical engineering. Electrical power engineering</subject><subject>Electrical power engineering</subject><subject>Energy accumulation</subject><subject>Energy storage</subject><subject>Exact sciences and technology</subject><subject>Flywheels</subject><subject>Superconductivity</subject><subject>Superconductors</subject><issn>0921-4534</issn><issn>1873-2143</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNpdT8tKxDAUDaLgOPoFbrIR3LTemzRpu5TBFwy4GXFZ0szNtGNfJq3Sv7egK8_mcB4cOIxdI8QIqO-O8VDNwcYCUMSIMYA8YSvMUhkJTOQpW0EuMEqUTM7ZRQhHWIA5rli1q4jX7eD7L9rzvWmHujvw3vEwDeRt3-0nO_ael2T8kgTuFiEV_3iv_ldcM39XRA2njvxh5mExzYF4mMNI7SU7c6YJdPXHa_b2-LDbPEfb16eXzf02GgRmY4ROOkSdgM2lBTAS0GljjcqAwGJKmdOZzHIAR7aUSpfklHSkQZeZUalcs9vf3eXS50RhLNo6WGoa01E_hQITnahcywVrdvNXNcGaxnnT2ToUg69b4-dCpAIFKJQ_AydrGA</recordid><startdate>20130214</startdate><enddate>20130214</enddate><creator>HAN, Y. H</creator><creator>PARK, B. J</creator><creator>JUNG, S. 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Electrical power engineering</topic><topic>Electrical power engineering</topic><topic>Energy accumulation</topic><topic>Energy storage</topic><topic>Exact sciences and technology</topic><topic>Flywheels</topic><topic>Superconductivity</topic><topic>Superconductors</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>HAN, Y. H</creatorcontrib><creatorcontrib>PARK, B. J</creatorcontrib><creatorcontrib>JUNG, S. Y</creatorcontrib><creatorcontrib>HAN, S. C</creatorcontrib><creatorcontrib>LEE, W. R</creatorcontrib><creatorcontrib>BAE, Y. C</creatorcontrib><collection>Pascal-Francis</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physica. C, Superconductivity</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>HAN, Y. H</au><au>PARK, B. J</au><au>JUNG, S. Y</au><au>HAN, S. C</au><au>LEE, W. R</au><au>BAE, Y. C</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The improved damping of superconductor bearings for 35 kWh superconductor flywheel energy storage system</atitle><jtitle>Physica. C, Superconductivity</jtitle><date>2013-02-14</date><risdate>2013</risdate><volume>485</volume><spage>102</spage><epage>106</epage><pages>102-106</pages><issn>0921-4534</issn><eissn>1873-2143</eissn><abstract>A 35 kWh Superconductor Flywheel Energy Storage system (SFES) using hybrid bearing sets, which is composed of a high temperature superconductor (HTS) bearing and an active magnet damper (AMD), has been developed at KEPCO Research Institute (KEPRI). Damping is a source of energy loss but necessary for the stability of the flywheel system. We found that the damping of HTS bearings can be improved by thermal insulating bolts, which play a role of passive type external damper. To investigate the source of the increased damping, damping coefficients were measured with HTS bearings using insulating bolts made of three kinds of polymer materials. The damping coefficient was raised over 3000 N s/m in the case of PEEK bolts. The value was almost a quarter of the AMD. In this study, thermoelastic and Coulomb friction damping mechanisms are discussed. The main damping mechanism was the thermoelastic damping of the bolts themselves. And interfacial gap between the insulating bolt and metal chamber, which increased during the cooling process, was considered to be the cause of the anisotropic damping coefficients. 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source | ScienceDirect Journals |
subjects | Applied sciences Bearings Bolts Damper bearings Damping Direct energy conversion and energy accumulation Electrical engineering. Electrical power engineering Electrical power engineering Energy accumulation Energy storage Exact sciences and technology Flywheels Superconductivity Superconductors |
title | The improved damping of superconductor bearings for 35 kWh superconductor flywheel energy storage system |
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