Professor DAVID GERADA's Outputs (16)

Impact of Static Air-Gap Eccentricity on Thermal Responses of Stator Winding Insulation in Synchronous Generators (2021)
Journal Article
He, Y.-L., Sun, K., Wu, Y., Zhao, H.-S., Wang, X.-L., Gerada, C., & Gerada, D. (2022). Impact of Static Air-Gap Eccentricity on Thermal Responses of Stator Winding Insulation in Synchronous Generators. IEEE Transactions on Industrial Electronics, 69(12), 13544-13554. https://doi.org/10.1109/TIE.2021.3135627

In this article, we present a comprehensive analysis on the thermal response characteristics of the stator winding insulation under static air-gap eccentricity (SAGE) conditions in synchronous generators. Different from previous studies, this article... Read More about Impact of Static Air-Gap Eccentricity on Thermal Responses of Stator Winding Insulation in Synchronous Generators.

Carbon Emission Analysis of Electrical Machines (2021)
Presentation / Conference Contribution
Zhang, X., Xu, Z., Gerada, C., & Gerada, D. (2021, October). Carbon Emission Analysis of Electrical Machines. Presented at 24th International Conference on Electrical Machines and Systems (ICEMS 2021), Gyeongju, Korea, Republic of

The industry places increased importance on carbon reduction. Many are focused on lowering the fuel consumption of electrical machines, however, carbon emissions from the acquisition of raw materials and the energy consumption of manufacturing proces... Read More about Carbon Emission Analysis of Electrical Machines.

Significance of Anisotropic Thermal Expansion in High Speed Electric Machines Employing NdFeB Permanent Magnets (2021)
Journal Article
Kumar, R., La Rocca, A., Vakil, G., Gerada, D., Gerada, C., & Fernandes, B. G. (2021). Significance of Anisotropic Thermal Expansion in High Speed Electric Machines Employing NdFeB Permanent Magnets. Energies, 14(22), Article 7558. https://doi.org/10.3390/en14227558

Many high speed applications employ a surface permanent magnet (PM) machine topology with a retaining sleeve due to its robustness and ability to achieve high overall peripheral speeds as well as efficiencies. One often overlooked feature in the mech... Read More about Significance of Anisotropic Thermal Expansion in High Speed Electric Machines Employing NdFeB Permanent Magnets.

A critical review on thermal management technologies for motors in electric cars (2021)
Journal Article
Wang, X., Li, B., Gerada, D., Huang, K., Stone, I., Worrall, S., & Yan, Y. (2022). A critical review on thermal management technologies for motors in electric cars. Applied Thermal Engineering, 201(Part A), Article 117758. https://doi.org/10.1016/j.applthermaleng.2021.117758

The development of electric cars has well been regarded as a major solution for tackling the challenges of carbon-neutrality faced by the modern communities. Electric motor is certainly the core and most important components of an electric car, and t... Read More about A critical review on thermal management technologies for motors in electric cars.

Rotor loss and temperature variation under single and combined faults composed of static air-gap eccentricity and rotor inter-turn short circuit in synchronous generators (2021)
Journal Article
He, Y. L., Zhang, W., Xu, M. X., Tao, W. Q., Liu, H. L., Dou, L. J., Wan, S. T., Li, J. Q., & Gerada, D. (2021). Rotor loss and temperature variation under single and combined faults composed of static air-gap eccentricity and rotor inter-turn short circuit in synchronous generators. IET Electric Power Applications, 15(11), 1529-1546. https://doi.org/10.1049/elp2.12118

In this study, the rotor loss as well as the temperature variations due to the static air-gap eccentricity (SAGE) and the rotor inter-turn short circuit (RISC) in synchronous generators is presented. Different from the previous studies, this study in... Read More about Rotor loss and temperature variation under single and combined faults composed of static air-gap eccentricity and rotor inter-turn short circuit in synchronous generators.

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.

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., Zhu, M., Xia, L., Zhang, W., & 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.

Segmented Hairpin Topology for Reduced Losses at High-Frequency Operations (2021)
Journal Article
Preci, E., Nuzzo, S., Valente, G., Gerada, D., Barater, D., Degano, M., Buticchi, G., & Gerada, C. (2022). Segmented Hairpin Topology for Reduced Losses at High-Frequency Operations. IEEE Transactions on Transportation Electrification, 8(1), 688-698. https://doi.org/10.1109/TTE.2021.3103821

Nowadays, one of the key challenges in transport electrification is the reduction of components’ size and weight. The electrical machine plays a relevant role in this regard. Designing machines with higher rotational speeds and excitation frequencies... Read More about Segmented Hairpin Topology for Reduced Losses at High-Frequency Operations.

A Novel Universal Model Considering SAGE for MFD-Based Faulty Property Analysis Under RISC in Synchronous Generators (2021)
Journal Article
He, Y.-L., Wang, Y., Jiang, H.-C., Gao, P., Yuan, X.-H., Gerada, D., & Liu, X.-Y. (2022). A Novel Universal Model Considering SAGE for MFD-Based Faulty Property Analysis Under RISC in Synchronous Generators. IEEE Transactions on Industrial Electronics, 69(7), 7415-7427. https://doi.org/10.1109/TIE.2021.3094481

This article proposes a new rotor interturn short circuit (RISC) fault analysis model for the electromechanical property study in synchronous generators. The specific novelty of this model lies in two aspects: First, It considers that most generators... Read More about A Novel Universal Model Considering SAGE for MFD-Based Faulty Property Analysis Under RISC in Synchronous Generators.

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.

Stator Non-Uniform Radial Ventilation Design Methodology for a 15 MW Turbo-Synchronous Generator Based on Single Ventilation Duct Subsystem (2021)
Journal Article
Li, R., Cheng, P., Lan, H., Li, W., Gerada, D., & Hong, Y. (2021). Stator Non-Uniform Radial Ventilation Design Methodology for a 15 MW Turbo-Synchronous Generator Based on Single Ventilation Duct Subsystem. Energies, 14(10), Article 2760. https://doi.org/10.3390/en14102760

Within large turboalternators, the excessive local temperatures and spatially distributed temperature differences can accelerate the deterioration of electrical insulation as well as lead to deformation of components, which may cause major machine ma... Read More about Stator Non-Uniform Radial Ventilation Design Methodology for a 15 MW Turbo-Synchronous Generator Based on Single Ventilation Duct Subsystem.

4-MW Class High-Power-Density Generator for Future Hybrid-Electric Aircraft (2021)
Journal Article
Golovanov, D., Gerada, D., Sala, G., Degano, M., Trentin, A., Connor, P. H., Xu, Z., Rocca, A. L., Galassini, A., Tarisciotti, L., Eastwick, C. N., Pickering, S. J., Wheeler, P., Clare, J., Filipenko, M., & Gerada, C. (2021). 4-MW Class High-Power-Density Generator for Future Hybrid-Electric Aircraft. IEEE Transactions on Transportation Electrification, 7(4), 2952-2964. https://doi.org/10.1109/TTE.2021.3068928

This article describes the underpinning research, development, construction, and testing of a 4-MW multithree phase generator designed for a hybrid-electric aircraft propulsion system demonstrator. The aim of the work is to demonstrate gravimetric po... Read More about 4-MW Class High-Power-Density Generator for Future Hybrid-Electric Aircraft.

A thermal modeling approach and experimental validation for an oil spray-cooled hairpin winding machine (2021)
Journal Article
Zhang, F., Gerada, D., Xu, Z., Liu, C., Zhang, H., Zou, T., Chong, Y. C., & Gerada, C. (2021). A thermal modeling approach and experimental validation for an oil spray-cooled hairpin winding machine. IEEE Transactions on Transportation Electrification, 7(4), 2914--2926. https://doi.org/10.1109/tte.2021.3067601

While the electromagnetic aspects of hairpin windings are actively being investigated and discussed in recent literature, including the design rules together with the loss calculation and reduction techniques, the thermal performance and modeling asp... Read More about A thermal modeling approach and experimental validation for an oil spray-cooled hairpin winding machine.

The Mechanism Analysis on Open-Circuit Back EMF in Fractional-Slot Concentrated Winding Permanent Magnet Machines Using Air-Gap Field Modulation Theory (2021)
Journal Article
Zhang, H., Yin, H., Hua, W., Zhu, X., Gerada, D., & Wang, B. (2021). The Mechanism Analysis on Open-Circuit Back EMF in Fractional-Slot Concentrated Winding Permanent Magnet Machines Using Air-Gap Field Modulation Theory. IEEE Transactions on Transportation Electrification, 7(4), 2658-2670. https://doi.org/10.1109/tte.2021.3066290

This article investigates the production mechanism of the open-circuit back-electromotive force (back EMF) in fractional-slot concentrated winding permanent magnet (FSCW-PM) machines based on the air-gap field modulation (AFM) theory. The relationshi... Read More about The Mechanism Analysis on Open-Circuit Back EMF in Fractional-Slot Concentrated Winding Permanent Magnet Machines Using Air-Gap Field Modulation Theory.

Comparison of rare-earth and hybrid-magnet mover configurations for a permanent magnet synchronous linear motor (2021)
Journal Article
Liu, X., Yu, H., Gerada, D., Xu, Z., Qiu, H., Jia, W., & Yang, C. (2021). Comparison of rare-earth and hybrid-magnet mover configurations for a permanent magnet synchronous linear motor. IET Electric Power Applications, 15(3), 321-331. https://doi.org/10.1049/elp2.12024

Force ripple and cost reduction are two of the main challenges in optimising the design and increasing the market uptake of permanent magnet synchronous linear motors (PMSLM). Two mover configurations are compared in depth; one made entirely from rar... Read More about Comparison of rare-earth and hybrid-magnet mover configurations for a permanent magnet synchronous linear motor.

Improving the Saliency of a High Speed SynRel Rotor by using High Strength Martensitic Sleeve (2021)
Presentation / Conference Contribution
Ram Kumar, R. M., Vakil, G., La Rocca, A., Gerada, D., Gerada, C., & Fernandes, B. G. (2021, January). Improving the Saliency of a High Speed SynRel Rotor by using High Strength Martensitic Sleeve. Presented at 2021 International Conference on Sustainable Energy and Future Electric Transportation (SEFET), Hyderabad, India

High strength magnetic steel laminations are the invariable choice to achieve the power density demands of high speed electric machines required in the automotive industry. However, the cost competitive automobile market, favours the use of conventio... Read More about Improving the Saliency of a High Speed SynRel Rotor by using High Strength Martensitic Sleeve.