A novel detached magnetic coupling structure for contactless power transfer

A contactless slipring offers an alternative solution to a mechanical slipring for power transfer, and magnetic coupling is the key part of the system. This paper proposes a novel detached magnetic coupling structure used for contactless sliprings systems. To minimize the losses and increase the pow...

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description A contactless slipring offers an alternative solution to a mechanical slipring for power transfer, and magnetic coupling is the key part of the system. This paper proposes a novel detached magnetic coupling structure used for contactless sliprings systems. To minimize the losses and increase the power transfer capability, a magnetic coupling structure with unique core geometry is proposed for a rotating transformer to transfer electrical power between the two parts. A Finite-Element-Boundary-Element (FEM-BEM) model is developed and FEM analysis conducted. The proposed contactless slipring system has been verified by simulation. The output power, efficiency, voltage gain and current gain are presented to assess the performance of the system. It has been found that the fringing flux on the windings affects the conduction losses and the EMI greatly, and it can be reduced by placing the winding away from the air-gap of the core. Practical design considerations as well as the advantages of the proposed structure as compared to a typical coaxial design of rotating transformer have been discussed. It has been shown that the proposed coupling structure can deliver up to 4.35 KW of power at a 25 Ω resistive load. An excellent magnetic coupling coefficient of 0.92 is achieved as a result of the specific core geometry with a single air gap. The voltage gain for this system is 0.83, which indicates a low internal voltage drop on the coupled coils.
doi_str_mv 10.1109/IECON.2011.6119462
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It has been found that the fringing flux on the windings affects the conduction losses and the EMI greatly, and it can be reduced by placing the winding away from the air-gap of the core. Practical design considerations as well as the advantages of the proposed structure as compared to a typical coaxial design of rotating transformer have been discussed. It has been shown that the proposed coupling structure can deliver up to 4.35 KW of power at a 25 Ω resistive load. An excellent magnetic coupling coefficient of 0.92 is achieved as a result of the specific core geometry with a single air gap. 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The voltage gain for this system is 0.83, which indicates a low internal voltage drop on the coupled coils.</description><subject>Atmospheric modeling</subject><subject>Contactless Power Transfer (CPT)</subject><subject>Couplings</subject><subject>Fringing flux</subject><subject>Geometry</subject><subject>JMAG</subject><subject>Magnetic flux</subject><subject>Rotating Transformer</subject><subject>Slip-rings</subject><subject>Transformer cores</subject><subject>Windings</subject><issn>1553-572X</issn><isbn>9781612849690</isbn><isbn>1612849695</isbn><isbn>1612849717</isbn><isbn>9781612849713</isbn><isbn>9781612849720</isbn><isbn>1612849725</isbn><fulltext>true</fulltext><rsrctype>conference_proceeding</rsrctype><creationdate>2011</creationdate><recordtype>conference_proceeding</recordtype><sourceid>6IE</sourceid><sourceid>RIE</sourceid><recordid>eNotkMFKAzEURSMq2Nb-gG7yAzPmJZOkWZaharHYjYK7kiYvdWQ6MySp4t87YFeXczncxSXkDlgJwMzDelVvX0vOAEoFYCrFL8gUFPBFZTToSzI3enFmZdgVmYCUopCaf9yQaUpfjMlqoWBCXpa067-xpR6zdZ_o6dEeOsyNo64_DW3THWjK8eTyKSINfRzrbjRziynRof_BSHO0XQoYb8l1sG3C-Tln5P1x9VY_F5vt07pebooGtMyFBraHoLxTmlfBC6-1Aa1QMO6MqKxw3hkjlHO4116CrCA4boSRMthREDNy_7_bIOJuiM3Rxt_d-QjxB-KEUIY</recordid><startdate>201111</startdate><enddate>201111</enddate><creator>Abdolkhani, A.</creator><creator>Hu, A. P.</creator><general>IEEE</general><scope>6IE</scope><scope>6IH</scope><scope>CBEJK</scope><scope>RIE</scope><scope>RIO</scope></search><sort><creationdate>201111</creationdate><title>A novel detached magnetic coupling structure for contactless power transfer</title><author>Abdolkhani, A. ; Hu, A. P.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-i175t-710b1f6dc6724fd3d779176e302c934a3cdc9936cceb7d51541fc293955fa9343</frbrgroupid><rsrctype>conference_proceedings</rsrctype><prefilter>conference_proceedings</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Atmospheric modeling</topic><topic>Contactless Power Transfer (CPT)</topic><topic>Couplings</topic><topic>Fringing flux</topic><topic>Geometry</topic><topic>JMAG</topic><topic>Magnetic flux</topic><topic>Rotating Transformer</topic><topic>Slip-rings</topic><topic>Transformer cores</topic><topic>Windings</topic><toplevel>online_resources</toplevel><creatorcontrib>Abdolkhani, A.</creatorcontrib><creatorcontrib>Hu, A. P.</creatorcontrib><collection>IEEE Electronic Library (IEL) Conference Proceedings</collection><collection>IEEE Proceedings Order Plan (POP) 1998-present by volume</collection><collection>IEEE Xplore All Conference Proceedings</collection><collection>IEEE Electronic Library (IEL)</collection><collection>IEEE Proceedings Order Plans (POP) 1998-present</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Abdolkhani, A.</au><au>Hu, A. P.</au><format>book</format><genre>proceeding</genre><ristype>CONF</ristype><atitle>A novel detached magnetic coupling structure for contactless power transfer</atitle><btitle>IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society</btitle><stitle>IECON</stitle><date>2011-11</date><risdate>2011</risdate><spage>1103</spage><epage>1108</epage><pages>1103-1108</pages><issn>1553-572X</issn><isbn>9781612849690</isbn><isbn>1612849695</isbn><eisbn>1612849717</eisbn><eisbn>9781612849713</eisbn><eisbn>9781612849720</eisbn><eisbn>1612849725</eisbn><abstract>A contactless slipring offers an alternative solution to a mechanical slipring for power transfer, and magnetic coupling is the key part of the system. This paper proposes a novel detached magnetic coupling structure used for contactless sliprings systems. To minimize the losses and increase the power transfer capability, a magnetic coupling structure with unique core geometry is proposed for a rotating transformer to transfer electrical power between the two parts. A Finite-Element-Boundary-Element (FEM-BEM) model is developed and FEM analysis conducted. The proposed contactless slipring system has been verified by simulation. The output power, efficiency, voltage gain and current gain are presented to assess the performance of the system. It has been found that the fringing flux on the windings affects the conduction losses and the EMI greatly, and it can be reduced by placing the winding away from the air-gap of the core. Practical design considerations as well as the advantages of the proposed structure as compared to a typical coaxial design of rotating transformer have been discussed. It has been shown that the proposed coupling structure can deliver up to 4.35 KW of power at a 25 Ω resistive load. An excellent magnetic coupling coefficient of 0.92 is achieved as a result of the specific core geometry with a single air gap. The voltage gain for this system is 0.83, which indicates a low internal voltage drop on the coupled coils.</abstract><pub>IEEE</pub><doi>10.1109/IECON.2011.6119462</doi><tpages>6</tpages></addata></record>
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source IEEE Electronic Library (IEL) Conference Proceedings
subjects Atmospheric modeling
Contactless Power Transfer (CPT)
Couplings
Fringing flux
Geometry
JMAG
Magnetic flux
Rotating Transformer
Slip-rings
Transformer cores
Windings
title A novel detached magnetic coupling structure for contactless power transfer
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