Professor CHRISTOPHER GERADA's Outputs (52)

Modelling, Analysis, and Design of a Line-Start Permanent Magnet Synchronous Motor (2022)
Presentation / Conference Contribution
Vannini, A., Simonelli, C., Marfoli, A., Papini, L., Bolognesi, P., & Gerada, C. (2022, September). Modelling, Analysis, and Design of a Line-Start Permanent Magnet Synchronous Motor. Presented at 2022 International Conference on Electrical Machines (ICEM), Valencia, Spain

Line-Start Permanent Magnet Motors are a valid alternative to conventional three-phase induction motors and wound-field synchronous machines for fixed-speed applications direct fed by the grid, targeting superior efficiency and high reliability. A ge... Read More about Modelling, Analysis, and Design of a Line-Start Permanent Magnet Synchronous Motor.

Performance Assessment of Standard Cooling Strategies for Hairpin Windings (2022)
Presentation / Conference Contribution
La Rocca, A., La Rocca, S., Zou, T., Liu, C., Moslemin, M., Gerada, C., & Cairns, A. (2022, September). Performance Assessment of Standard Cooling Strategies for Hairpin Windings. Presented at 2022 International Conference on Electrical Machines (ICEM), Valencia, Spain

This paper aims to assess the performance of some standard cooling strategies which are commonly used in traction electric motors for electric vehicles (EVs) employing hairpin windings. The use of such type of coils does normally lead to higher power... Read More about Performance Assessment of Standard Cooling Strategies for Hairpin Windings.

Comparative Analysis of Synchronous Reluctance Machine against Conventional Induction Machine for Railway Traction (2022)
Presentation / Conference Contribution
Tom, L., Khowja, M. R., Ramanathan, R., Vakil, G., & Gerada, C. (2022, September). Comparative Analysis of Synchronous Reluctance Machine against Conventional Induction Machine for Railway Traction. Presented at 2022 International Conference on Electrical Machines, ICEM 2022, Valencia, Spain

Electrification in railway industry offers better performing trains with reduced pollution and maximised capacity. SynREL is gaining more interest as a candidate for traction application in place of IM due to its simple and robust structure. Conseque... Read More about Comparative Analysis of Synchronous Reluctance Machine against Conventional Induction Machine for Railway Traction.

Concept and Preliminary Sizing of a Dual DC-Bus Homopolar Generator Using Diode Rectifiers (2022)
Presentation / Conference Contribution
Vannini, A., Papini, L., Marfoli, A., Gerada, C., & Bolognesi, P. (2022, September). Concept and Preliminary Sizing of a Dual DC-Bus Homopolar Generator Using Diode Rectifiers. Presented at 2022 International Conference on Electrical Machines (ICEM), Valencia, Spain

Synchronous Homopolar Generators represent an attractive solution for the future of power generation in propulsive systems based on hybrid turbo-electric drivetrains. In fact they feature both a fully controllable excitation, similar to wound-field s... Read More about Concept and Preliminary Sizing of a Dual DC-Bus Homopolar Generator Using Diode Rectifiers.

Analysis and Mitigation of AC Losses in High Performance Propulsion Motors (2022)
Journal Article
Hebala, A., Nuzzo, S., Connor, P. H., Volpe, G., Gerada, C., & Galea, M. (2022). Analysis and Mitigation of AC Losses in High Performance Propulsion Motors. Machines, 10(9), Article 780. https://doi.org/10.3390/machines10090780

In this paper, the AC copper losses in classical random windings are investigated and mitigated using several techniques across a range of permanent magnet synchronous motor designs. At high operating frequencies, AC copper losses can represent a sub... Read More about Analysis and Mitigation of AC Losses in High Performance Propulsion Motors.

Improving Saliency of High-Speed Synchronous Reluctance Machine Using Rotor Sleeve made of Bi-State Magnetic Material (2022)
Presentation / Conference Contribution
Ram Kumar, R. M., Vakil, G., & Gerada, C. (2022, August). Improving Saliency of High-Speed Synchronous Reluctance Machine Using Rotor Sleeve made of Bi-State Magnetic Material. Presented at 2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT), Hyderabad, India

Synchronous reluctance (SynRel) machines with improved saliency ratio can be realized using bi-state magnetic material (BSMM) in the rotor. However, a significantly higher number of localized heat treatments are required on the BSMM to maximize its e... Read More about Improving Saliency of High-Speed Synchronous Reluctance Machine Using Rotor Sleeve made of Bi-State Magnetic Material.

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.

Surrogate role of machine learning in motor-drive optimization for more-electric aircraft applications (2022)
Journal Article
Gao, Y., Cheong, B., Bozhko, S., Wheeler, P., Gerada, C., & Yang, T. (2023). Surrogate role of machine learning in motor-drive optimization for more-electric aircraft applications. Chinese Journal of Aeronautics, 36(2), 213-228. https://doi.org/10.1016/j.cja.2022.08.011

Motor drives form an essential part of the electric compressors, pumps, braking and actuation systems in the More-Electric Aircraft (MEA). In this paper, the application of Machine Learning (ML) in motor-drive design and optimization process is inves... Read More about Surrogate role of machine learning in motor-drive optimization for more-electric aircraft applications.

Comparison of AC Losses in the Winding of Electrical Machines with Fixed Strands Positions, Fixed Conductor Shapes and Random Winding (2022)
Journal Article
Bardalai, A., Gerada, D., Zou, T., Degano, M., Zhang, C., & Gerada, C. (2022). Comparison of AC Losses in the Winding of Electrical Machines with Fixed Strands Positions, Fixed Conductor Shapes and Random Winding. Energies, 15(15), Article 5701. https://doi.org/10.3390/en15155701

In high performance electric machines, the increase of fundamental frequency leads to additional losses in the winding due to parasitic effects such as the associated skin and proximity effects. In the first part, this paper presents an investigation... Read More about Comparison of AC Losses in the Winding of Electrical Machines with Fixed Strands Positions, Fixed Conductor Shapes and Random Winding.

Magnetic Field and Radial Force Analysis of Six-Phase Rotary Machine (2022)
Journal Article
Dong, Z., Yan, L., & Gerada, C. (2022). Magnetic Field and Radial Force Analysis of Six-Phase Rotary Machine. Guidance, Navigation and Control, 02(03), Article 2250011. https://doi.org/10.1142/s273748072250011x

Six-phase permanent magnet synchronous machine and the control system are also widely used in industry, precision instruments and aerospace. However, most PMSMs employ magnet patterns either in alternatively radial magnetization or Halbach array, whi... Read More about Magnetic Field and Radial Force Analysis of Six-Phase Rotary Machine.

Experimental Investigation of Oil Jet Cooling in Electrical Machines with Hairpin Windings (2022)
Journal Article
Liu, C., Xu, Z., Gerada, D., Zhang, F., Chong, Y. C., Michon, M., Goss, J., Gerada, C., & Zhang, H. (2023). Experimental Investigation of Oil Jet Cooling in Electrical Machines with Hairpin Windings. IEEE Transactions on Transportation Electrification, 9(1), 598-608. https://doi.org/10.1109/TTE.2022.3186947

Oil jet cooling and hairpin windings have become popular in electrical machine design for modern electric vehicles. In recent years, these two technologies are often combined and can be found in many commercial products. The highly effective cooling... Read More about Experimental Investigation of Oil Jet Cooling in Electrical Machines with Hairpin Windings.

Analytical Model for the Open Circuit Field due to Different Magnetization Patterns of the rotor in the Slotless Machines (2022)
Presentation / Conference Contribution
Dave, N., Gerada, D., Vakil, G., Zhang, H., Li, J., & Gerada, C. (2022, September). Analytical Model for the Open Circuit Field due to Different Magnetization Patterns of the rotor in the Slotless Machines. Presented at ICEM 2022 XXV International Conference on Electrical Machines, Valencia, Spain

From the existing literature, the open circuit field due to different magnetisations of the rotor magnets is known. This includes field due to parallel, radial and Halbach magnetisation. This paper presents the generalised analytical model to represe... Read More about Analytical Model for the Open Circuit Field due to Different Magnetization Patterns of the rotor in the Slotless Machines.

Electromechanical Characteristics Analysis under DSISC Fault in Synchronous Generators (2022)
Journal Article
He, Y.-L., Qiu, M.-H., Yuan, X.-H., He, X.-L., Wang, H.-P., Jiang, M.-Y., Gerada, C., & Wan, S.-T. (2022). Electromechanical Characteristics Analysis under DSISC Fault in Synchronous Generators. Machines, 10(6), Article 432. https://doi.org/10.3390/machines10060432

This paper studies the electromechanical characteristics of synchronous generators under dynamic stator interturn short circuit (DSISC). First, the air gap magnetic flux density (MFD) of the generator under normal and DSISC fault was obtained. Then,... Read More about Electromechanical Characteristics Analysis under DSISC Fault in Synchronous Generators.

A multi-roller static model of the planetary roller screw mechanism considering load sharing (2022)
Journal Article
Fu, X., Li, X., Ma, S., Gerada, D., Liu, G., & Gerada, C. (2022). A multi-roller static model of the planetary roller screw mechanism considering load sharing. Tribology International, 173, Article 107648. https://doi.org/10.1016/j.triboint.2022.107648

A multi-roller static model is proposed to calculate load sharing and load distribution in a planetary roller screw mechanism (PRSM) with axial loads and errors. Taking into the actual positions of rollers, the PRSM is discretized into a multi-roller... Read More about A multi-roller static model of the planetary roller screw mechanism considering load sharing.

High Speed Permanent Magnet Assisted Synchronous Reluctance Machines - Part I: A General Design Approach (2022)
Journal Article
Gallicchio, G., Di Nardo, M., Palmieri, M., Marfoli, A., Degano, M., Gerada, C., & Cupertino, F. (2022). High Speed Permanent Magnet Assisted Synchronous Reluctance Machines - Part I: A General Design Approach. IEEE Transactions on Energy Conversion, 37(4), 1-1. https://doi.org/10.1109/tec.2022.3176382

The design of synchronous reluctance machines with and without permanent magnets assistance constitutes a challenging engineering task due to the numerous design variables and performance indexes to be considered. The design complexity increases even... Read More about High Speed Permanent Magnet Assisted Synchronous Reluctance Machines - Part I: A General Design Approach.

High Speed Permanent Magnet Assisted Synchronous Reluctance Machine - Part II: Performance Boundaries (2022)
Journal Article
Di Nardo, M., Gallicchio, G., Palmieri, M., Marfoli, A., Degano, M., Gerada, C., & Cupertino, F. (2022). High Speed Permanent Magnet Assisted Synchronous Reluctance Machine - Part II: Performance Boundaries. IEEE Transactions on Energy Conversion, 37(4), 2567-2577. https://doi.org/10.1109/tec.2022.3176383

The insertion of permanent magnets (PMs) within the rotor slots of Synchronous Reluctance Machines (SyRM) is the most common design strategy used to increase significantly their performance. In this paper it is shown how a permanent magnet assisted s... Read More about High Speed Permanent Magnet Assisted Synchronous Reluctance Machine - Part II: Performance Boundaries.

Electromagnetic Torque Fluctuating Properties under Dynamic RISC Fault in Turbogenerators (2022)
Journal Article
He, Y., Qiu, M., Yuan, X., Wang, H., Jiang, M., Gerada, C., & Wan, S. (2022). Electromagnetic Torque Fluctuating Properties under Dynamic RISC Fault in Turbogenerators. Energies, 15(10), Article 3821. https://doi.org/10.3390/en15103821

This paper analyzes the electromagnetic torque (EMT) fluctuation characteristics in synchronous generators under rotor interturn short-circuit (DRISC) fault. The novelty of this paper is that the DRISC fault is proposed based on the intermittent inte... Read More about Electromagnetic Torque Fluctuating Properties under Dynamic RISC Fault in Turbogenerators.

On the Use of Topology Optimization for Synchronous Reluctance Machines Design (2022)
Journal Article
Korman, O., Di Nardo, M., Degano, M., & Gerada, C. (2022). On the Use of Topology Optimization for Synchronous Reluctance Machines Design. Energies, 15(10), Article 3719. https://doi.org/10.3390/en15103719

Synchronous reluctance (SynRel) machines are considered one of the promising and cost-effective solutions to many industrial and mobility applications. Nonetheless, achieving an optimal design is challenging due to the complex correlation between geo... Read More about On the Use of Topology Optimization for Synchronous Reluctance Machines Design.

Analytical Methodology for Eddy Current Loss Simulation in Armature Windings of Synchronous Electrical Machines With Permanent Magnets (2022)
Journal Article
Golovanov, D., Galassini, A., Transi, T., & Gerada, C. (2022). Analytical Methodology for Eddy Current Loss Simulation in Armature Windings of Synchronous Electrical Machines With Permanent Magnets. IEEE Transactions on Industrial Electronics, 69(10), 9761-9770. https://doi.org/10.1109/tie.2022.3161818

This article describes a novel analytical methodology for eddy current losses simulation in the windings of permanent magnet synchronous machines. The methodology is based on subdomain modeling technique in conjunction with solving of ordinary differ... Read More about Analytical Methodology for Eddy Current Loss Simulation in Armature Windings of Synchronous Electrical Machines With Permanent Magnets.

Mild hybridisation of turboprop engine with high-power-density integrated electric drives (2022)
Journal Article
Cossart, G., Chen, Y., Yang, T., Khowja, M., La Rocca, A., Nasir, U., Chowdhury, S., Evans, D., Kember, D., Klonowski, T., Arnaud, Y., Apostin, L., Liger, T., Cossart, G., Vakil, G., Gerada, C., Bozhko, S., Detry, S., Diette, C., & Wheeler, P. (2022). Mild hybridisation of turboprop engine with high-power-density integrated electric drives. IEEE Transactions on Transportation Electrification, 8(4), 4148-4162. https://doi.org/10.1109/TTE.2022.3160153

This paper shares with the aerospace community a case study of turboprop mild hybridisation using a recently developed integrated drive system in the University of Nottingham, UK, within the ACHIEVE project under EU H2020 CleanSky 2 program (project... Read More about Mild hybridisation of turboprop engine with high-power-density integrated electric drives.