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Abbott, Michael David (2020) Multi-dimensional coupling mapping to evaluate the coupling factor of inductive charging coils for electric vehicles: an innovation report vehicles. EngD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b3709824~S15
Abstract
Wireless Power Transfer (WPT) technologies have been demonstrated by numerous research groups
worldwide. Prototypes, both at small scale, and full sized systems, have been made. Some of these
are in active service today, mainly in bus projects such as KAIST’s OLEV(Suh, 2015) and Milton Keynes
IPT(Bowdler, 2014). Since 2012 the technology has been promised to customers in 1-2 years, however,
currently (2018), no WPT systems are available on the market in the UK. So why have WPT
technologies stopped just short of mainstream adoption?
Compatibility between the road (GA) and vehicle (VA) parts of a WPT system is has been identified as
a barrier to this mainstream adoption. One parameter of interest is the suitability of the magnetic field
between the GA-VA, a requirement termed magnetic compatibility. The work of Lin et al.(Lin, Covic
and Boys, 2015), has identified that certain GA-VA combinations are intrinsically not compatible.
The work in this document has developed criteria for assessing magnetic compatibility at the early
stages of the WPT development process. Coupling factor between the GA and VA is considered the
critical criterion for compatibility. This value must exceed a defined minimum across the operational
positional range of the WPT system. The value accounts for both the geometry and materials used in
the GA/VA as well as some of the field interaction between the GA and VA. Using theory and
simulations, it has been shown that coupling factor is independent of the scale of the system.
A set of both finite element (FE) and experimental (EXP) methods have been developed to assess GA-
VA magnetic compatibility for small-scale coil prototypes. These are capable of high-resolution
measurement in three dimensions, termed Multi-Dimensional Coupling Mapping (MDCM). This
method can be used to characterise new GA-VA pairings, consider unusual coupling profiles and
perform assessment for the sizing of GA and VA coils to meet alignment tolerances. The coil
operational modes of multi-coil GA/VA designs can also be considered.
The draft J2954 standard from the SAE incorporates tests of compatibility with complete GA and VA
parts. By using the MDCM method, compliance of a coil design with the J2954 standard can be
considered. This assessment can be performed at the early stages of coil development using small
scale prototypes without the need for the GA/VA coil electronics. Incorporating MDCM methods into
the development process for new WPT designs can standardise assessment and reduce the risk of late
stage compliance failure.
Item Type: | Thesis (EngD) | ||||
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Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||
Library of Congress Subject Headings (LCSH): | Wireless power transmission, Electric vehicles -- Power supply, Magnetic couplings, Power electronics, Battery charging stations (Electric vehicles), Electric coils | ||||
Official Date: | 3 March 2020 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Warwick Manufacturing Group | ||||
Thesis Type: | EngD | ||||
Publication Status: | Unpublished | ||||
Extent: | 136 leaves :illustrations (some color, some black and white), charts. | ||||
Language: | eng |
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