dc.contributor.advisor |
Covic, G |
en |
dc.contributor.advisor |
Boys, J |
en |
dc.contributor.author |
Kissin, Michael |
en |
dc.date.accessioned |
2019-08-20T02:29:47Z |
en |
dc.date.issued |
2009 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/47518 |
en |
dc.description.abstract |
This thesis proposes a new poly-phase track topology which provides high tolerance to lateral movement of inductive power transfer (IPT) pickups. IPT is a technology that is widely used for providing power to mobile loads in industrial situations or for monorails where the path of the load is well defined and tightly constrained. A poly-phase track provides greater tolerance to load movement, and makes IPT more suitable for use in roadway applications for electric vehicles with limited or no driver assistance. This is achieved while using a very simple and low cost flat pickup structure. The magnetic performance of the new track topology is first analysed without the presence of a pickup. It is found that the moving magnetic field created by the track eliminates nulls in the magnetic field. The pickup is then introduced and the power transfer characteristics are determined. It is shown that the power transfer to the pickup can be made to be essentially constant across a wide area of track, with a usable width of over five times that of an equivalent single-phase system. A poly-phase IPT track can therefore provide enough tolerance to vehicular applications where the vehicle movement is relatively unrestricted. Due to the nonlinear nature of magnetic circuits, analytic solutions (where they can be formulated) are often cumbersome and provide little insight. The approach taken in this thesis has therefore been to produce many results through computer simulation and to analyse trends that can be of use in the design of poly-phase IPT systems. These trends are then verified experimentally, and explained using electromagnetic theory. Using these trends, a simple and fast design procedure is developed for flat pickups. A practical three-phase prototype system was created for the thesis, exposing several implementation challenges. Mutual inductance exists between the track phases, and can disrupt the power supply operation. A model is created to analyse this effect, and several methods are detailed which can be used to reduce or eliminate it. A steady-state loading model is created for a flat pickup operating on the poly-phase track. It shows that the power supply components must be carefully rated because the track phases do not generally load share effectively, and the apparent power requirements can be much higher than the real load power. Together, these models show that the optimal poly-phase track uses either a two- or three-phase bipolar design, depending on the movement tolerance required. These track types provide adequate load sharing, simple tuning, and the ability to reduce the interphase mutual inductance. Finally, a brief discussion is given on the potential for the pickup to be extended beyond the typical flat design. A quadrature-type pickup which makes use of an additional coil can provide higher power transfer in some situations, up to a 67% increase over an equivalent flat pickup, and comes with a minimal increase in parts count for the tuning of the additional coil. |
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dc.publisher |
ResearchSpace@Auckland |
en |
dc.relation.ispartof |
PhD Thesis - University of Auckland |
en |
dc.relation.isreferencedby |
UoA99192104014002091 |
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dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.rights.uri |
http://creativecommons.org/licenses/by-nc-sa/3.0/nz/ |
en |
dc.title |
Poly-phase inductively coupled power transfer systems |
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dc.type |
Thesis |
en |
thesis.degree.discipline |
Electrical and Electronic Engineering |
en |
thesis.degree.grantor |
The University of Auckland |
en |
thesis.degree.level |
Doctoral |
en |
thesis.degree.name |
PhD |
en |
dc.rights.holder |
Copyright: The author |
en |
pubs.elements-id |
261281 |
en |
pubs.record-created-at-source-date |
2011-12-15 |
en |
dc.identifier.wikidata |
Q112881204 |
|