Dr ADAM WALKER's Outputs (26)

High Pole Number Outer-Rotor SPM Machine for Sustainable 150kW High-Speed EV Traction (2024)
Presentation / Conference Contribution
Walker, A., Zou, T., Mifsud, L. P., Connor, P., Huang, H., Ren, X., Batho, G., Tweedy, O., Gerada, C., & Kaloun, A. (2024, October). High Pole Number Outer-Rotor SPM Machine for Sustainable 150kW High-Speed EV Traction. Presented at 2024 IEEE Vehicle Power and Propulsion Conference, VPPC 2024, Washington, DC, USA

The ambitious roadmaps of electric vehicle (EV) powertrains are pushing traction motors to achieve step-change performance improvements in power density, efficiency, and cost by 2035. Limited by technology bricks such as materials, manufacturing and... Read More about High Pole Number Outer-Rotor SPM Machine for Sustainable 150kW High-Speed EV Traction.

In-Slot Oil Cooling Arrangement of Hairpin Windings for High Power Density EV Traction Motors (2024)
Presentation / Conference Contribution
Mifsud, L. P., Connor, P. H., Walker, A., Zou, T., Huang, H., Ren, X., Batho, G., Tweedy, O., Gerada, C., & Egger, C. (2024, October). In-Slot Oil Cooling Arrangement of Hairpin Windings for High Power Density EV Traction Motors. Presented at 2024 IEEE Vehicle Power and Propulsion Conference, VPPC 2024, Washington, DC, USA

Ambitious electrification roadmaps for the automotive industry have prompted a revolution in winding technology for traction motors in electric vehicles (EV). Hairpin windings with reduced power losses and improved coolability are overtaking the mark... Read More about In-Slot Oil Cooling Arrangement of Hairpin Windings for High Power Density EV Traction Motors.

Highly Manufacturable Edgewise Winding Design Integrating Cooling Solutions for High Power Density Applications (2024)
Presentation / Conference Contribution
George, E., Walker, A., Zhang, F., Vakil, G., & Gerada, C. (2024, October). Highly Manufacturable Edgewise Winding Design Integrating Cooling Solutions for High Power Density Applications. Presented at 2024 IEEE Vehicle Power and Propulsion Conference, VPPC 2024, Washington, DC, USA

Edgewise winding is reported recently for high-performance electric machines. However, to achieve widespread uptake of electric machines, it is essential to consider the manufacturing time of the complete machine solution. For example, with different... Read More about Highly Manufacturable Edgewise Winding Design Integrating Cooling Solutions for High Power Density Applications.

Comparison of V-shaped IPM Machines Winding Topologies for Heavy-duty EV Applications (2023)
Presentation / Conference Contribution
George, L., Walker, A., Zhang, F., Vakil, G., & Gerada, C. (2023, March). Comparison of V-shaped IPM Machines Winding Topologies for Heavy-duty EV Applications. Presented at 2023 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC), Venice, Italy

High performance electric machines are critical for heavy-duty electric vehicles (HDEV) to enable transportation electrification, where there is a significant performance gap between the traditional internal combustion engines and electrical machine... Read More about Comparison of V-shaped IPM Machines Winding Topologies for Heavy-duty EV Applications.

Airgap Length Analysis of a 350kW PM-Assisted Syn-Rel Machine for Heavy Duty EV Traction (2022)
Journal Article
Zou, T., Gerada, D., La Rocca, S., La Rocca, A., Walker, A., Vakil, G., Arevalo, . S. L., Xu, Z., Cui, M., Bardalai, A., Wang, M., Kumar, R. M. R., Marfoli, A., Paciura, . K., Barden, R., Ernest, E., Zhu, . S., Qayyum, N., McQueen, A., Zhang, F., & Gerada, C. (2023). Airgap Length Analysis of a 350kW PM-Assisted Syn-Rel Machine for Heavy Duty EV Traction. IEEE Transactions on Industry Applications, 59(2), 1557-1570. https://doi.org/10.1109/TIA.2022.3225255

Synchronous reluctance (Syn-Rel) machines with embedded permanent magnets (PMs) are research hotspots in variable speed motor drives due to their robust rotor structure and wide constant power speed range (CPSR). In this paper, the potential of PM-as... Read More about Airgap Length Analysis of a 350kW PM-Assisted Syn-Rel Machine for Heavy Duty EV Traction.

Modifications to PM-assisted Synchronous Reluctance Machine to Achieve Rare-Earth Free Heavy-duty Traction (2022)
Journal Article
Al-ani, M., Walker, A., Vakil, G., Gerada, D., Gerada, C., & Paciura, K. (2023). Modifications to PM-assisted Synchronous Reluctance Machine to Achieve Rare-Earth Free Heavy-duty Traction. IEEE Journal of Emerging and Selected Topics in Power Electronics, 11(2), 2029 -2038. https://doi.org/10.1109/jestpe.2022.3203184

Automotive applications require electrical machines designed for high torque density, wide speed range, and low cost. NdFeB magnets can achieve a high torque density and wide speed range, and however, they have a high cost. Therefore, this article ex... Read More about Modifications to PM-assisted Synchronous Reluctance Machine to Achieve Rare-Earth Free Heavy-duty Traction.

Design of Rare-Earth-Free PM-assisted Synchronous Reluctance Machine for Heavy-duty Automotive Application (2021)
Presentation / Conference Contribution
Al-ani, M., La Rocca, S., La Rocca, A., Walker, A., Ramanathan, R., Zou, T., Vakil, G., Gerada, D., Gerada, C., Paciura, K., & McQueen, A. (2020, December). Design of Rare-Earth-Free PM-assisted Synchronous Reluctance Machine for Heavy-duty Automotive Application. Presented at The 10th International Conference on Power Electronics, Machines and Drives (PEMD 2020), Online Conference

Electrical machines designed for automotive applications are characterised by high torque density, wide speed range and low cost. The use of NdFeB magnets in such machines can achieve the required high torque density and wide speed range, however, it... Read More about Design of Rare-Earth-Free PM-assisted Synchronous Reluctance Machine for Heavy-duty Automotive Application.

A Multiport Power Electronics Converter for Hybrid Traction Applications (2021)
Journal Article
Choy, W. J., Costabeber, A., Buticchi, G., Trentin, A., Walker, A., Galea, M., Paciura, K., O'Brien, J., & Palmer, B. (2021). A Multiport Power Electronics Converter for Hybrid Traction Applications. IEEE Access, 9, 99181-99192. https://doi.org/10.1109/ACCESS.2021.3089371

Environmental concerns and energy efficiency have been driving the transportation innovation in the past decades. In this framework, hybrid city transport has been receiving the attention of the industry. The challenges for this application are the r... Read More about A Multiport Power Electronics Converter for Hybrid Traction Applications.

Influence of Airgap Length on Performance of High Power PM-Assisted Syn-Rel Machines (2020)
Presentation / Conference Contribution
Zou, T., Gerada, D., Walker, A., Vakil, G., La Rocca, S., La Rocca, A., Paciura, K., Barden, R., Ernest, E., Zhu, S., Qayyum, N., McQueen, A., Bardalai, A., Ram Kumar, R. M., Marfoli, A., & Gerada, C. (2020, October). Influence of Airgap Length on Performance of High Power PM-Assisted Syn-Rel Machines. Presented at 2020 IEEE Energy Conversion Congress and Exposition (ECCE 2020), Detroit, MI, USA

In recent years, synchronous reluctance (Syn-Rel) machines are research hotspots in variable speed motor drives due to their robust rotor structure and wide constant power speed range (CPSR). More practically, when kVA limitation is considered, embed... Read More about Influence of Airgap Length on Performance of High Power PM-Assisted Syn-Rel Machines.

Novel Permanent Magnet Synchronous Motor with Integrated Filter Inductor Using Motor's Inherent Magnetics (2020)
Journal Article
Khowja, M. R., Gerada, C., Vakil, G., Patel, C., Odhano, S. A., Walker, A., & Wheeler, P. (2021). Novel Permanent Magnet Synchronous Motor with Integrated Filter Inductor Using Motor's Inherent Magnetics. IEEE Transactions on Industrial Electronics, 68(7), 5638-5649. https://doi.org/10.1109/tie.2020.3000110

A close functional and structural integration of passive elements is required to improve the power density of motor drives. Such power-dense motor drives are prerequisites in aerospace and automotive applications. This article presents a permanent ma... Read More about Novel Permanent Magnet Synchronous Motor with Integrated Filter Inductor Using Motor's Inherent Magnetics.

High Power High Speed PM-Assisted SynRel Machines with Ferrite and Rare Earth Magnets for Future Electric Commercial Vehicles (2019)
Presentation / Conference Contribution
Kumar, R. M. R., Zou, T., La Rocca, A., Vakil, G., Gerada, D., Walker, A., Gerada, C., Paciura, K., McQueen, A., & Fernandes, B. G. (2019, October). High Power High Speed PM-Assisted SynRel Machines with Ferrite and Rare Earth Magnets for Future Electric Commercial Vehicles. Presented at 45th Annual Conference of the IEEE Industrial Electronics Society (IECON 2019), Lisbon, Portugal

High power density and high torque density are the fundamental requirements for electric machines used in traction application. The former is obtained by potentially increasing the speed of the machine while the latter by using high energy density ra... Read More about High Power High Speed PM-Assisted SynRel Machines with Ferrite and Rare Earth Magnets for Future Electric Commercial Vehicles.

Multi-physics Design Optimisation of PM-assisted Synchronous Reluctance Motor for Traction Application (2019)
Presentation / Conference Contribution
Al-Ani, M., Walker, A., Vakil, G., Ramanathan, R., Zou, T., La Rocca, S., La Rocca, A., Gerada, D., Gerada, C., Paciura, K., & McQueen, A. (2019, October). Multi-physics Design Optimisation of PM-assisted Synchronous Reluctance Motor for Traction Application. Presented at IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society, Lisbon, Portugal

Recently, the synchronous reluctance machine limits have been pushed toward meeting the requirements of traction applications. A skilled electromagnetic architecture of a synchronous reluctance machine with the help of permanent magnets can push the... Read More about Multi-physics Design Optimisation of PM-assisted Synchronous Reluctance Motor for Traction Application.

Numerical study of the impact of different cooling arrangements on a high length/diameter ratio motor for electric commercial vehicle (2019)
Presentation / Conference Contribution
La Rocca, S., La Rocca, A., Walker, A., Vakil, G., Gerada, D., Al-Ani, M., Zou, T., Ramanathan, R., Gerada, C., McQueen, A., & Paciura, K. (2019, October). Numerical study of the impact of different cooling arrangements on a high length/diameter ratio motor for electric commercial vehicle. Presented at International Conference on Electrotechnical Complexes and Systems (ICOECS 2019), Ufa, Russia

Computational Fluid Dynamics (CFD) was used to carry out a fluid flow and thermal investigation of a high power dense traction machine for electric commercial vehicle. One of the features of the machine design considered is the high Length/Diameter (... Read More about Numerical study of the impact of different cooling arrangements on a high length/diameter ratio motor for electric commercial vehicle.

Enhancing the Torque Density of Conventional PM-SynRel Machine with Hybrid Flux Barrier (2019)
Presentation / Conference Contribution
Kumar, R. M. R., Vakil, G., Gerada, D., Walker, A., La Rocca, S., Al-Ani, M., Gerada, C., Paciura, K., McQueen, A., & Fernandes, B. G. (2019, October). Enhancing the Torque Density of Conventional PM-SynRel Machine with Hybrid Flux Barrier. Presented at 45th Annual Conference of the IEEE Industrial Electronics Society (IECON 2019), Lisbon, Portugal

Electrical machines with high torque density are required for traction application. Availability of bonded magnets with complex shapes and magnetization pattern can significantly extend the design space of electrical machines. This paper introduces a... Read More about Enhancing the Torque Density of Conventional PM-SynRel Machine with Hybrid Flux Barrier.

Contextual Dishonest Behaviour Detection for Cognitive Adaptive Charging in Dynamic Smart Micro-Grids (2019)
Presentation / Conference Contribution
Radenkovic, M., & Walker, A. (2019, January). Contextual Dishonest Behaviour Detection for Cognitive Adaptive Charging in Dynamic Smart Micro-Grids. Presented at IEEE/IFIP WONS 2019 15th Annual Conference 2019 15th Annual Conference on Wireless On-demand Network Systems and Services (WONS), Wengen, Switzerland

The emerging Smart Grid (SG) paradigm promises to address decreasing grid stability from thinning safe operating margins, meet continually rising demand from pervasive high capacity devices such as electric vehicles (EVs), and fully embrace the shift... Read More about Contextual Dishonest Behaviour Detection for Cognitive Adaptive Charging in Dynamic Smart Micro-Grids.

Current-Fed Isolated DC/DC Converter for Future Aerospace Microgrids (2018)
Journal Article
Tarisciotti, L., Costabeber, A., Chen, L., Walker, A., & Galea, M. (2019). Current-Fed Isolated DC/DC Converter for Future Aerospace Microgrids. IEEE Transactions on Industry Applications, 55(3), 2823-2832. https://doi.org/10.1109/tia.2018.2889845

High-performance power conversion equipment is currently gaining an increasing interest for aircraft applications. In particular, isolated bidirectional dc/dc converters are often proposed for modern aircraft distribution systems. A current-fed isola... Read More about Current-Fed Isolated DC/DC Converter for Future Aerospace Microgrids.

Improved thermal management and analysis for stator end-windings of electrical machines (2018)
Journal Article
Madonna, V., Walker, A., Giangrande, P., Serra, G., Gerada, C., & Galea, M. (2019). Improved thermal management and analysis for stator end-windings of electrical machines. IEEE Transactions on Industrial Electronics, 66(7), 5057-5069. https://doi.org/10.1109/tie.2018.2868288

In electrical machine design, thermal management plays a key role in improving performance and reducing size. End-windings are commonly identified as the machine hot-spot. Hence, lowering and predicting end-windings temperature are crucial tasks in t... Read More about Improved thermal management and analysis for stator end-windings of electrical machines.

Towards Better Understanding the Challenges of Reliable and Trust-Aware Critical Communications in the Aftermath of Disaster (2018)
Presentation / Conference Contribution
Radenkovic, M., Walker, A., & Bai, L. (2018, June). Towards Better Understanding the Challenges of Reliable and Trust-Aware Critical Communications in the Aftermath of Disaster. Presented at 2018 14th International Wireless Communications and Mobile Computing Conference, IWCMC 2018, Limassol, Cyprus

This paper seeks to better understand the highly multi-dimensional, multi-faceted challenges of meeting trust and reliability requirements in critical, disaster aftermath communication networks comprising heterogeneous groups of sensor equipped nodes... Read More about Towards Better Understanding the Challenges of Reliable and Trust-Aware Critical Communications in the Aftermath of Disaster.

CognitiveCharge: disconnection tolerant adaptive collaborative and predictive vehicular charging (2018)
Presentation / Conference Contribution
Radenkovic, M., & Walker, A. CognitiveCharge: disconnection tolerant adaptive collaborative and predictive vehicular charging. Presented at 4th ACM MobiHoc Workshop on Experiences with the Design and Implementation of Smart Objects (Smartobjects '18)

Electric vehicles (EVs) are rapidly becoming more common and ownership is set to rise globally in coming years. The potential impacts of increased EVs on the electrical grid have been widely investigated and in its current state, existing grid infras... Read More about CognitiveCharge: disconnection tolerant adaptive collaborative and predictive vehicular charging.

Novel core designs to miniaturise passive magnetic components (2018)
Presentation / Conference Contribution
Walker, A., Vakil, G., & Gerada, C. (2018, June). Novel core designs to miniaturise passive magnetic components. Presented at ITEC 2018

Converter sizes are often dominated by passive magnetic components. Passive magnetic component sizes are in turn limited by electromagnetic saturation and thermal limits. This paper covers two modifications to the air gaps of tape wound amorphous mag... Read More about Novel core designs to miniaturise passive magnetic components.