Magne&c Field Distribu&on in a WPT System for Electric ... · Progress In Electromagne0cs Research...
Transcript of Magne&c Field Distribu&on in a WPT System for Electric ... · Progress In Electromagne0cs Research...
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ProgressInElectromagne0csResearchSymposiumShanghai,2016
Magne&cFieldDistribu&oninaWPTSystemforElectricVehicleCharging
RuiFeng1,NinaRoscoe2,LaythQaseer1,MariuszBojarski1,JaegueShin1,DariuszCzarkowski1,FranciscoDeLeon1,StephenFinney2,andQijunDeng3
1NewYorkUniversity
2UniversityofStrathclyde3WuhanUniversity
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Introduc0on
Ø Wireless power transfer technology has various applications.
Source:www.iectechnology.com
Smart phones & Tablets AA Battery Powered Devices
Source:h3p://powerbyproxi.com/wireless-charging/
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Source:rahulmi3al.wordpress.com/2014/03/31/wireless-charging-do-we-need-this-technology-in-its-current-form/
Medical Devices & Equipment
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Source:h3p://arBcles.sae.org/12647/
Vehicles & Transport
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Introduc0on
Ø Wireless power transfer technology has various applications. Ø Wireless power transfer technology has many benefits.
• Convenience; • Compatibility; • Safety; • Durability;
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Mo0va0ons
§ Efficient design of WPT for electric vehicles;
§ Safety consideration of WPT system.
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SystemOverviewØ Wireless charging electric vehicle;
Source:h3p://gcep.stanford.edu/images/news/wireless_car_charging_400px.jpg
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SystemOverviewØ Wireless charging electric vehicles;Ø Inductive coupled power transfer (ICPT) system;
Ref. J. Kim, 2013
• Nearrange• Highpowerefficiency• Lowfrequency
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Chassis
ReceiverPad
TransmiVerPad
SystemOverviewØ Wireless charging electric vehicles; Ø Inductive coupled power transfer system; Ø 3-D finite-element analysis in system design;
TransmiVer/ReceiverPad
Coppercoils(4turns);
FerriteCore(840mmx680mm); Aluminumshield(914mmx914mm).
Chassis:steelsheet(1250mmx1900mm).
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SystemOverviewØ Wireless charging electric vehicles; Ø Inductive coupled power transfer system; Ø 3-D finite-element analysis in system design;
Chassis
Chassis
Chassis
Receiver Pad
Receiver Pad
Transmitter Pad
Transmitter Pad
Measurement Plane
Measurement Plane
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SystemOverviewØ Wireless charging electric vehicles; Ø Inductive coupled power transfer system; Ø 3-D finite-element analysis in system design; Ø Experimental system.
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ResultsOutline
1) Effect of output power on magnetic field distribution (MFD)
2) Effect of coil spacing on MFD
3) Effect of chassis on MFD
4) Effect of misalignment on MFD
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EffectofOutputPower
Ø The transmitter pad and the receiver pad are perfectly aligned. Ø Coil spacing is 200mm. Ø Chassis is in position. Ø Load resistance is 5.54Ω. Ø MFD is measured 300mm above ground.
Howisthemagne0cfielddistribu0onfor——5kW,15kWand20kWoutputpower?
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EffectofOutputPowerExperimental Results
5kW 15kW
20kW
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EffectofOutputPowerExperimental Results (Scaled to 20kW)
5kW 15kW
20kW
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EffectofCoilSpacing
Ø The transmitter pad and the receiver pad are perfectly aligned. Ø Chassis is in position. Ø MFD is measured 300mm above ground.
Howisthemagne0cfielddistribu0onfor——100mm,150mm,200mmand250mmcoilspacing?
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EffectofCoilSpacing
100mm 150mm
200mm 250mm
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EffectofCoilSpacing
100mm 150mm
Put all results in the same-size window. All results are scaled to 20kW.
200mm 250mm
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EffectofChassis
Ø The transmitter pad and the receiver pad are perfectly aligned. Ø Coil spacing is 200mm. Ø Output power is 15kW. Ø MFD is measured 300mm above ground.
Howisthemagne0cfielddistribu0onfor——withchassisandwithoutchassiscase?
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EffectofChassis
Withoutchassis Withchassis
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EffectofMisalignmentØ Coil spacing is 200mm. Ø 15kW output power; Ø MFD is measured 300mm above ground.
Howisthemagne0cfielddistribu0onfor——alignedandmisalignedcoils,with/withoutchassis?
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EffectofMisalignment
200mmmisaligned,withchassis Aligned,withchassis
Aligned,nochassis 200mmmisaligned,nochassis
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Conclusion
1. We have studied the impact of four parameters on the magnetic field distribution in wireless power transfer system for EVs.
2. We have verified that the magnetic field distribution is proportional to the square root of output power.
3. Small gap leads to smaller fringing fields.
4. Inclusion of chassis in the system effectively shields the magnetic field.
5. Misalignment between coils increases the magnetic field.