Professor DAVID GERADA's Outputs (102)

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.

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.

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.

An Analytical Approach for the Design of Innovative Hairpin Winding Layouts (2020)
Presentation / Conference Contribution
Arzillo, A., Nuzzo, S., Braglia, P., Franceschini, G., Barater, D., Gerada, D., & Gerada, C. (2020, August). An Analytical Approach for the Design of Innovative Hairpin Winding Layouts. Presented at 2020 International Conference on Electrical Machines (ICEM), Gothenburg, Sweden

This work deals with an analytical approach aimed at accurately predicting Joule losses in innovative hairpin winding layouts. While hairpin windings are seeing an everincreasing use in automotive and aerospace applications due to their inherently hi... Read More about An Analytical Approach for the Design of Innovative Hairpin Winding Layouts.

Challenges and Future opportunities of Hairpin Technologies (2020)
Presentation / Conference Contribution
Arzillo, A., Braglia, P., Nuzzo, S., Barater, D., Franceschini, G., Gerada, D., & Gerada, C. (2020, June). Challenges and Future opportunities of Hairpin Technologies. Presented at 2020 IEEE 29th International Symposium on Industrial Electronics (ISIE), Delft, Netherlands

Hairpin windings are seeing an ever-increasing application and development in electrical machines designed for high power and torque densities. In fact, due to their inherently high fill factor, they are very attractive in applications, such as trans... Read More about Challenges and Future opportunities of Hairpin Technologies.

A New External Search Coil Based Method to Detect Detailed Static Air-Gap Eccentricity Position in Nonsalient Pole Synchronous Generators (2020)
Journal Article
He, Y.-L., Zhang, Z.-J., Tao, W.-Q., Wang, X.-L., Gerada, D., Gerada, C., & Gao, P. (2021). A New External Search Coil Based Method to Detect Detailed Static Air-Gap Eccentricity Position in Nonsalient Pole Synchronous Generators. IEEE Transactions on Industrial Electronics, 68(8), 7535-7544. https://doi.org/10.1109/tie.2020.3003635

This research investigates the detection of the detailed static air-gap eccentricity position (SAGE) at both the ends of nonsalient pole synchronous generators (SG). Differently from the previous studies, the detection method proposed does not necess... Read More about A New External Search Coil Based Method to Detect Detailed Static Air-Gap Eccentricity Position in Nonsalient Pole Synchronous Generators.

Rotor UMP characteristics and vibration properties in synchronous generator due to 3D static air-gap eccentricity faults (2020)
Journal Article
He, Y. L., Sun, Y. X., Xu, M. X., Wang, X. L., Wu, Y. C., Vakil, G., Gerada, D., & Gerada, C. (2020). Rotor UMP characteristics and vibration properties in synchronous generator due to 3D static air-gap eccentricity faults. IET Electric Power Applications, 14(6), 961-971. https://doi.org/10.1049/iet-epa.2019.0844

In this article, the qualitative theoretical derivation, together with finite element analysis and experimental studies are presented to investigate the unbalanced magnetic pull (UMP) as well as the rotor vibration characteristics. Differently from p... Read More about Rotor UMP characteristics and vibration properties in synchronous generator due to 3D static air-gap eccentricity faults.