Structural and thermo-mechanical performance of fragile components integrated in IPT pads for electric roadway applications

Inductive power transfer (IPT) technology can be used to conveniently and straightforwardly charge stationary or moving electric vehicles. The primary IPT pad, buried in the pavement, flush-, or surface-mounted, contains components to emit and alter an electromagnetic field. Litz wires are used for the coil due to their ability to reduce proximity and skin effects. Manganese-zinc (MnZn) ferrite cores shape the electromagnetic flux and reduce the leakage flux. Failure of brittle MnZn ferrite cores or damaged litz wire coils has been commonly found in tested IPT pad designs. These failures lead to a partial decrease or complete loss of transmission efficiency. This research focuses on characterising and improving the structural and thermo-structural performance of MnZn ferrites and litz wire to create robust primary IPT charging unit solutions. This research has identified and characterised the potential failures and the corresponding structural limits of electromagnetic components in primary IPT pads. Various surface treatments and manufacturing methods have been identified and developed for use with MnZn ferrite cores and litz wire coils. The influence of surface treatments on the structural, fatigue, and bonding behaviour of MnZn cores has been experimentally evaluated. Numerical models have been used to predict the structural, thermo-structural, and thermal behaviour of the components and the impact of the improvements on the overall performance of the primary IPT pad. Overall, the presented research has led to an improved understanding of the structural and thermo-structural behaviour of the electromagnetic components. This enables the design of a reliable and robust primary IPT pad by identifying susceptible components and their subsequent improvement for critical load scenarios.

• Record URL:
  • https://hdl.handle.net/2292/67870
• Supplemental Notes:
  • PhD thesis
• Authors:
  • Piefke, C
• Publication Date: 2023

Media Info

• Pagination: 1 file

Subject/Index Terms

• TRT Terms: Durability; Electric vehicle charging; Electromagnets; Improvements; Mathematical models; Motion; Pavements; Surface course (Pavements); Surfacing
• Uncontrolled Terms: Electric road
• Geographic Terms: New Zealand
• ATRI Terms: Durability; Modelling; Movement; Pavement; Surfacing; Vehicle recharging
• ITRD Terms: 984: Charging (electric vehicle)
• Subject Areas: Pavements; I61: Equipment and Maintenance Methods;

Filing Info

• Accession Number: 01924619
• Record Type: Publication
• Source Agency: ARRB Group Limited
• Files: ITRD, ATRI
• Created Date: Jul 18 2024 10:34AM