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Professor DAVID GERADA's Outputs (135)

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.

Research and Realization of High-Power Medium-Voltage Active Rectifier Concepts for Future Hybrid-Electric Aircraft Generation (2020)
Journal Article
Trentin, A., Sala, G., Tarisciotti, L., Galassini, A., Degano, M., Connor, P. H., Golovanov, D., Gerada, D., Xu, Z., La Rocca, A., Eastwick, C. N., Pickering, S. J., Wheeler, P., Clare, J. C., & Gerada, C. (2021). Research and Realization of High-Power Medium-Voltage Active Rectifier Concepts for Future Hybrid-Electric Aircraft Generation. IEEE Transactions on Industrial Electronics, 68(12), 11684-11695. https://doi.org/10.1109/TIE.2020.3040692

In this article, we describe the research and development of a 3 kV active rectifier for a 4 MW aerospace generator drive system demonstrator. The converter is fed by a multiphase high-speed/high-frequency permanent magnet generator. The main aim of... Read More about Research and Realization of High-Power Medium-Voltage Active Rectifier Concepts for Future Hybrid-Electric Aircraft Generation.

Thermal Management of Electrified Propulsion System for Low-Carbon Vehicles (2020)
Journal Article
Li, B., Kuo, H., Wang, X., Chen, Y., Wang, Y., Gerada, D., Worall, S., Stone, I., & Yan, Y. (2020). Thermal Management of Electrified Propulsion System for Low-Carbon Vehicles. Automotive Innovation, 3(4), 299-316. https://doi.org/10.1007/s42154-020-00124-y

An overview of current thermal challenges in transport electrification is introduced in order to underpin the research developments and trends of recent thermal management techniques. Currently, explorations of intelligent thermal management and cont... Read More about Thermal Management of Electrified Propulsion System for Low-Carbon Vehicles.

Experimental Statistical Method Predicting AC Losses on Random Windings and PWM Effect Evaluation (2020)
Journal Article
Preci, E., Valente, G., Galassini, A., Yuan, X., Degano, M., Gerada, D., Buticchi, G., & Gerada, C. (2021). Experimental Statistical Method Predicting AC Losses on Random Windings and PWM Effect Evaluation. IEEE Transactions on Energy Conversion, 36(3), 2287-2296. https://doi.org/10.1109/TEC.2020.3040265

Nowadays, one of the challenges in transport electrification is the reduction of the components' size and weight in order to improve the power density. This is often achieved by designing electrical machines with higher rotational speeds and excitati... Read More about Experimental Statistical Method Predicting AC Losses on Random Windings and PWM Effect Evaluation.

Comparison of slotted and slotless PM machines for high kW/kg aerospace applications (2020)
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.

AC loss Analysis in Winding of Electrical Machines with varying Strands-in-hand and Bundle Shapes (2020)
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.

Influence of Rotor Design on Electromagnetic Performance in Interior Permanent Magnet Machines (2020)
Presentation / Conference Contribution
Transi, T., Murataliyev, M., Degano, M., Preci, E., Gerada, D., & Gerada, C. (2020, October). Influence of Rotor Design on Electromagnetic Performance in Interior Permanent Magnet Machines. Presented at IECON 2020 - 46th Annual Conference of the IEEE Industrial Electronics Society, Singapore, Singapore

Nowadays, Interior Permanent Magnet Synchronous Machines (IPMSM) are widely adopted in various sectors such as automotive, railway or public transportation (e- buses, trams, etc.). Among the benefits that these machines present, they offer a number o... Read More about Influence of Rotor Design on Electromagnetic Performance in Interior Permanent Magnet Machines.

Rectangular and Random Conductors: AC Losses Evaluations and Manufacturing Considerations (2020)
Presentation / Conference Contribution
Preci, E., Valente, G., Bardalai, A., Transi, T., Zou, T., Gerada, D., Degano, M., Buticchi, G., & Gerada, C. (2020, October). Rectangular and Random Conductors: AC Losses Evaluations and Manufacturing Considerations. Presented at IECON 2020 - 46th Annual Conference of the IEEE Industrial Electronics Society, Singapore, Singapore

This paper presents a comparison between hairpin and random distributed winding in electrical machines for automotive applications. Indeed, the overall performance of an electrical drive system is seriously affected by its winding design. The conside... Read More about Rectangular and Random Conductors: AC Losses Evaluations and Manufacturing Considerations.

Estimation of Oil Spray Cooling Heat Transfer Coefficients on Hairpin Windings With Reduced-Parameter Models (2020)
Journal Article
Liu, C., Gerada, D., Xu, Z., Chong, Y. C., Michon, M., Goss, J., Li, J., Gerada, C., & Zhang, H. (2021). Estimation of Oil Spray Cooling Heat Transfer Coefficients on Hairpin Windings With Reduced-Parameter Models. IEEE Transactions on Transportation Electrification, 7(2), 793-803. https://doi.org/10.1109/tte.2020.3031373

Hairpin windings and spray cooling are becoming an increasingly popular combination in the field of high-performance electrical machine design. Machines adopting hairpin windings can achieve higher torque and power densities while enabling them to be... Read More about Estimation of Oil Spray Cooling Heat Transfer Coefficients on Hairpin Windings With Reduced-Parameter Models.

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.

SISO Control Strategy of Resonant Dual Active Bridge with a Tuned CLC Network (2020)
Presentation / Conference Contribution
Wang, M., Yang, B., Xu, L., Li, J., Gerada, D., Gu, C., Zhang, H., Gerada, C., & Li, Y. (2020, September). SISO Control Strategy of Resonant Dual Active Bridge with a Tuned CLC Network. Presented at 2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe), Lyon, France

This paper proposed a linear state-space model for a resonant dual active bridge with a tuned capacitor-inductor-capacitor network which is applied to an energy storage system. The proposed model is used for predicting the behavior of the proposed sy... Read More about SISO Control Strategy of Resonant Dual Active Bridge with a Tuned CLC Network.

Improved V‐shaped interior permanent magnet rotor topology with inward‐extended bridges for reduced torque ripple (2020)
Journal Article
Gao, P., Sun, X., Gerada, D., Gerada, C., & Wang, X. (2020). Improved V‐shaped interior permanent magnet rotor topology with inward‐extended bridges for reduced torque ripple. IET Electric Power Applications, 14(12), 2404-2411. https://doi.org/10.1049/iet-epa.2019.0850

Interior permanent magnet synchronous machines (IPMSMs) with V-shaped permanent magnet (PM) rotors are widely used as traction motors in electric vehicles because of their high torque density and high efficiency. However, the V-shape IPMSMs have the... Read More about Improved V‐shaped interior permanent magnet rotor topology with inward‐extended bridges for reduced torque ripple.

Impact of Stator Interturn Short Circuit Position on End Winding Vibration in Synchronous Generators (2020)
Journal Article
He, Y.-L., Xu, M.-X., Zhang, W., Wang, X.-L., Lu, P., Gerada, C., & Gerada, D. (2021). Impact of Stator Interturn Short Circuit Position on End Winding Vibration in Synchronous Generators. IEEE Transactions on Energy Conversion, 36(2), 713-724. https://doi.org/10.1109/tec.2020.3021901

This article presents a comprehensive analysis on the end winding vibration characteristics due to different stator inter-turn short circuit (SISC) positions in synchronous generators. Different from other studies, this article not only pays attentio... Read More about Impact of Stator Interturn Short Circuit Position on End Winding Vibration in Synchronous Generators.

Optimized Magnet wire size and Slot winding height for minimum AC losses in a Traction Machine (2020)
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.