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A Review of Carbon Emissions from Electrical Machine Materials (2024)
Journal Article
Zhang, X., Gerada, D., Xu, Z., Zhang, F., & Gerada, C. (2024). A Review of Carbon Emissions from Electrical Machine Materials. Electronics, 13(9), Article 1714. https://doi.org/10.3390/electronics13091714

As the world embarks on a global mission to tackle climate change, reducing carbon represents a key challenge given the escalating global warming. The U.K. is among many other nations that are determined to decarbonise all sectors and strive to achie... Read More about A Review of Carbon Emissions from Electrical Machine Materials.

Analytical Calculation and Experimental Validation of Litz Wires Axial Thermal Conductivity (2023)
Journal Article
Li, Z., Xu, Z., Zhang, F., Gerada, D., Guo, R., Zhang, H., …Zhang, C. (2024). Analytical Calculation and Experimental Validation of Litz Wires Axial Thermal Conductivity. IEEE Transactions on Transportation Electrification, 10(1), 1167-1179. https://doi.org/10.1109/TTE.2023.3262766

Litz wires are widely used in electrical machines with reduced AC losses, compared to traditional random winding. The reduced AC losses can improve both electrical machines electromagnetic performance, such as efficiency and thermal performance. Ther... Read More about Analytical Calculation and Experimental Validation of Litz Wires Axial Thermal Conductivity.

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.

Performance Entitlement by Using Novel High Strength Electrical Steels and Copper Alloys for High-Speed Laminated Rotor Induction Machines (2022)
Journal Article
Zhang, F., Gerada, D., Xu, Z., He, Y., Zhang, H., Hua, W., & Gerada, C. (2022). Performance Entitlement by Using Novel High Strength Electrical Steels and Copper Alloys for High-Speed Laminated Rotor Induction Machines. Electronics, 11(2), 210. https://doi.org/10.3390/electronics11020210

The laminated rotor Induction Machine (IM), with its simple construction and manufacturing, robustness, ease of control and comparatively lower cost remains by far the most utilized electromechanical energy converter. At very high speeds, traditional... Read More about Performance Entitlement by Using Novel High Strength Electrical Steels and Copper Alloys for High-Speed Laminated Rotor Induction Machines.

Improved Thermal Modeling and Experimental Validation of Oil-Flooded High-Performance Machines with Slot-Channel Cooling (2021)
Journal Article
Zhang, F., Gerada, D., Xu, Z., Zhang, X., Zhang, H., Gerada, C., …Degano, M. (2022). Improved Thermal Modeling and Experimental Validation of Oil-Flooded High-Performance Machines with Slot-Channel Cooling. IEEE Transactions on Transportation Electrification, 8(1), 312-324. https://doi.org/10.1109/TTE.2021.3106819

Thermal management is often considered a bottleneck in the pursuit of the next-generation electrical machines for electrified transportation with a step change in power density. Slot-channel cooling is considered to be an effective cooling technique,... Read More about Improved Thermal Modeling and Experimental Validation of Oil-Flooded High-Performance Machines with Slot-Channel Cooling.

Electrical Machine Slot Thermal Condition Effects on Back Iron Extension Thermal Benefits (2021)
Journal Article
Zhang, F., Gerada, D., Xu, Z., Tighe, C., Zhang, H., Yan, L., & Gerada, C. (2021). Electrical Machine Slot Thermal Condition Effects on Back Iron Extension Thermal Benefits. IEEE Transactions on Transportation Electrification, 7(4), 2927-2938. https://doi.org/10.1109/tte.2021.3085822

The slot thermal condition is critical for thermal management of high-performance electrical machines, due to the high heat losses and poor heat transfer ability within the slot. With a part of the back iron projected radially downward into the slot,... Read More about Electrical Machine Slot Thermal Condition Effects on Back Iron Extension Thermal Benefits.

Experimental study of thermal fracturing of Hot Dry Rock irradiated by moving laser beam: Temperature, efficiency and porosity (2020)
Journal Article
Wang, Y., Jiang, J., Darkwa, J., Xu, Z., Zheng, X., & Zhou, G. (2020). Experimental study of thermal fracturing of Hot Dry Rock irradiated by moving laser beam: Temperature, efficiency and porosity. Renewable Energy, 160, 803-816. https://doi.org/10.1016/j.renene.2020.06.138

A new laser irradiation fracturing method is employed to crack the Hot Dry Rock (HDR) and variations of rock temperature, specific energy (SE) and modified specific energy (MSE), thermal damages and open porosity of granite samples caused by moving l... Read More about Experimental study of thermal fracturing of Hot Dry Rock irradiated by moving laser beam: Temperature, efficiency and porosity.

Analytical Model of Modular Spoke-Type Permanent Magnet Machines for In-Wheel Traction Applications (2020)
Journal Article
Zhang, H., Hua, W., Gerada, D., Xu, Z., & Gerada, C. (2020). Analytical Model of Modular Spoke-Type Permanent Magnet Machines for In-Wheel Traction Applications. IEEE Transactions on Energy Conversion, 35(3), 1289-1300. https://doi.org/10.1109/tec.2020.2979886

This paper proposes an analytical model of modular spoke-type permanent magnet (MSTPM) machines based on air-gap field modulation (AFM) theory. Firstly, a fundamental AFM model of open-circuit MSTPM machines is introduced. The open-circuit air-gap fi... Read More about Analytical Model of Modular Spoke-Type Permanent Magnet Machines for In-Wheel Traction Applications.

Effective Thermal Conductivity Calculation and Measurement of Litz Wire based on the Porous Metal Materials Structure (2019)
Journal Article
Liu, X., Gerada, D., Xu, Z., Corfield, M., Gerada, C., & Yu, H. (2020). Effective Thermal Conductivity Calculation and Measurement of Litz Wire based on the Porous Metal Materials Structure. IEEE Transactions on Industrial Electronics, 67(4), 2667-2677. https://doi.org/10.1109/tie.2019.2910031

Litz wires are employed in high-frequency electrical machines due to their advantages of reducing the ac losses, including minimizing the skin effect and the proximity effect. In order to improve the reliability of such machines, and enable accurate... Read More about Effective Thermal Conductivity Calculation and Measurement of Litz Wire based on the Porous Metal Materials Structure.

Design and losses analysis of a high power density machine for flooded pump applications (2018)
Journal Article
Al-Timimy, A., Giangrande, P., Degano, M., Zeyuan, X., Galea, M., Gerada, C., Lo Calzo, G., Zhang, H., & Xia, L. (2019). Design and losses analysis of a high power density machine for flooded pump applications. IEEE Transactions on Industry Applications, 54(4), 3260-3270. https://doi.org/10.1109/TIA.2018.2821623

This paper describes the design process of a 10 kW 19000 rpm high power density surface mounted permanent magnet synchronous machine for a directly coupled pump application. In order to meet the required specifications, a compact machine, with coolin... Read More about Design and losses analysis of a high power density machine for flooded pump applications.

Thermo-Mechanical Modelling of Bearing Chambers of a High-Speed Starter/Generator
Presentation / Conference Contribution
Rocca, A. L., Connor, P. H., Xu, Z., Eastwick, C. N., Pickering, S. J., & Gerada, C. (2019, May). Thermo-Mechanical Modelling of Bearing Chambers of a High-Speed Starter/Generator. Presented at 2019 IEEE International Electric Machines & Drives Conference (IEMDC), San Diego, CA, USA

This paper describes the thermal-mechanical characterisation methodology for the bearing chambers of a high-speed (32,000 rpm) electrical starter/generator [1]; presenting a low cost analysis approach and design guideline for future machines. The met... Read More about Thermo-Mechanical Modelling of Bearing Chambers of a High-Speed Starter/Generator.

Design of Hairpin Winding and Random Winding Stators for High Speed Heavy-Duty Traction Motor
Presentation / Conference Contribution
Jiang, J., Zou, T., La Rocca, A., La Rocca, S., Liu, C., Xu, Z., Gerada, C., Zhu, S., Paciura, K., & Gerada, D. (2023, October). Design of Hairpin Winding and Random Winding Stators for High Speed Heavy-Duty Traction Motor. Presented at 2023 IEEE Vehicle Power and Propulsion Conference (VPPC), Milan, Italy

Hairpin winding with rectangularly shaped conductors are gradually replacing random winding wound with stranded wires in electric vehicle (EV) industry. As the newgeneration winding technology, hairpin winding features high electromagnetic and therma... Read More about Design of Hairpin Winding and Random Winding Stators for High Speed Heavy-Duty Traction Motor.

A Taguchi-LHS-RSM Double-Staged Approach for Design Optimization of Self-Ventilated Cooling Systems Utilized in PMSMs
Presentation / Conference Contribution
Zhu, G., Xu, Z., Zhang, F., Gerada, C., & Gerada, D. (2023, November). A Taguchi-LHS-RSM Double-Staged Approach for Design Optimization of Self-Ventilated Cooling Systems Utilized in PMSMs. Presented at 26th International Conference on Electrical Machines and Systems (ICEMS), Zhuhai, China

Thermal management is critical for high-power-density permanent magnet synchronous machines (PMSMs). To realize the efficient and effective design optimization of self-ventilated air cooling systems for PMSMs, in this paper, a Taguchi-preconditioned... Read More about A Taguchi-LHS-RSM Double-Staged Approach for Design Optimization of Self-Ventilated Cooling Systems Utilized in PMSMs.

Analysis of a Five-Phase PM Vernier Machine Topology with Two-Slot Pitch Winding
Presentation / Conference Contribution
Zhu, S., Cox, T., Xu, Z., & Gerada, C. (2020, October). Analysis of a Five-Phase PM Vernier Machine Topology with Two-Slot Pitch Winding. Presented at 2020 IEEE Energy Conversion Congress and Exposition (ECCE), Detroit, MI, USA

This paper presents a five-phase permanent magnet (PM) vernier machine topology equipped with a two-slot pitch winding. The two-slot pitch winding provides a trade-off between fractional slots concentrated winding (FSCW) and integrated slot distribut... Read More about Analysis of a Five-Phase PM Vernier Machine Topology with Two-Slot Pitch Winding.

AC loss Analysis in Winding of Electrical Machines with varying Strands-in-hand and Bundle Shapes
Presentation / Conference Contribution
Bardalai, A., Gerada, D., Xu, Z., & Gerada, C. (2020, November). AC loss Analysis in Winding of Electrical Machines with varying Strands-in-hand and Bundle Shapes. Presented at 2020 23rd International Conference on Electrical Machines and Systems (ICEMS), Hamamatsu, Japan

This paper presents an investigation into the sensitivity of high-frequency AC effects on the winding with varying number of parallel strands. Based on numerical analysis, a methodology to segregate the losses into components is presented. It is show... Read More about AC loss Analysis in Winding of Electrical Machines with varying Strands-in-hand and Bundle Shapes.

Comparison of slotted and slotless PM machines for high kW/kg aerospace applications
Presentation / Conference Contribution
Dave, N., Vakil, G., Xu, Z., Gerada, C., Zhang, H., & Gerada, D. (2020, November). Comparison of slotted and slotless PM machines for high kW/kg aerospace applications. Presented at 2020 23rd International Conference on Electrical Machines and Systems (ICEMS), Hamamatsu, Japan

With the ambitious targeted emissions reduction, the aircraft industry is moving towards drastically different aircraft architectures including hybrid-electric. These in turn require electrical machines with a step change improvement in power-density... Read More about Comparison of slotted and slotless PM machines for high kW/kg aerospace applications.

Optimized Magnet wire size and Slot winding height for minimum AC losses in a Traction Machine
Presentation / Conference Contribution
Bardalai, A., Gerada, D., Xu, Z., & Gerada, C. (2020, August). Optimized Magnet wire size and Slot winding height for minimum AC losses in a Traction Machine. Presented at 2020 International Conference on Electrical Machines (ICEM), Gothenburg

The demand for high performance electrical machines that combine high power density (kW/kg or kW/L), light – weighting and high efficiency have become more and more important in recent years. In these machines, mitigation of the parasitic losses asso... Read More about Optimized Magnet wire size and Slot winding height for minimum AC losses in a Traction Machine.

Power Loss and Performance Analysis of a Permanent Magnet Synchronous Motor for Actuator Applications
Presentation / Conference Contribution
Tameemi, A., Degano, M., Di Nardo, M., Murataliyev, M., Gerada, D., Xu, Z., & Gerada, C. (2022, September). Power Loss and Performance Analysis of a Permanent Magnet Synchronous Motor for Actuator Applications. Presented at 2022 International Conference on Electrical Machines (ICEM), Valencia, Spain

Permanent magnet synchronous motors are very suitable in applications demanding high power density with high performance requirements, such as in aerospace actuators. Achieving high performance targets while keeping the total weight of the electrical... Read More about Power Loss and Performance Analysis of a Permanent Magnet Synchronous Motor for Actuator Applications.