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Professor CHRISTOPHER GERADA's Outputs (188)

Rotor Eddy Current Loss and Multiphysics Fields Analysis for a High-Speed Permanent Magnet Machine (2020)
Journal Article
Zhang, Y., Wang, H., & Gerada, C. (2021). Rotor Eddy Current Loss and Multiphysics Fields Analysis for a High-Speed Permanent Magnet Machine. IEEE Transactions on Industrial Electronics, 68(6), 5100-5111. https://doi.org/10.1109/tie.2020.2988192

High-speed permanent magnet machine (HSPMM) design is considered with particular attention paid to machine electromagnetic, thermal, and mechanical analyses. In this article, a 140-kW, 15 000 r/min HSPMM is designed with its power losses evaluated at... Read More about Rotor Eddy Current Loss and Multiphysics Fields Analysis for a High-Speed Permanent Magnet Machine.

Electric drive systems with long feeder cables (2020)
Journal Article
Xie, P., Vakil, G., & Gerada, C. (2020). Electric drive systems with long feeder cables. IET Electric Power Applications, 14(1), 16-30. https://doi.org/10.1049/iet-epa.2018.5507

Electric drive systems with long feeder cables connecting inverter and machine are used for oil exploration, mining, remote operated vehicles, industrial, and aerospace applications. Though this topology has the advantage of providing a better operat... Read More about Electric drive systems with long feeder cables.

The potential of exploiting non-symmetric structures in electrical machines (2019)
Presentation / Conference Contribution
Nuzzo, S., Marfoli, A., Papini, L., Bolognesi, P., Gerada, C., & Galea, M. (2019, October). The potential of exploiting non-symmetric structures in electrical machines. Presented at 45th Annual Conference of the IEEE Industrial Electronics Society (IECON 2019), Lisbon, Portugal

Typically, electrical machines feature rotor and stator winding configurations and core structures which comply with both simplicity and cost requirements. Such constraints limit the design search space and degrees of freedom, thus leading to exploit... Read More about The potential of exploiting non-symmetric structures in electrical machines.

Numerical study of the impact of different cooling arrangements on a high length/diameter ratio motor for electric commercial vehicle (2019)
Presentation / Conference Contribution
La Rocca, S., La Rocca, A., Walker, A., Vakil, G., Gerada, D., Al-Ani, M., Zou, T., Ramanathan, R., Gerada, C., McQueen, A., & Paciura, K. (2019, October). Numerical study of the impact of different cooling arrangements on a high length/diameter ratio motor for electric commercial vehicle. Presented at International Conference on Electrotechnical Complexes and Systems (ICOECS 2019), Ufa, Russia

Computational Fluid Dynamics (CFD) was used to carry out a fluid flow and thermal investigation of a high power dense traction machine for electric commercial vehicle. One of the features of the machine design considered is the high Length/Diameter (... Read More about Numerical study of the impact of different cooling arrangements on a high length/diameter ratio motor for electric commercial vehicle.

Trade-off Study of a High Power Density Starter-Generator for Turboprop Aircraft System (2019)
Presentation / Conference Contribution
Khowja, M. R., Vakil, G., Gerada, C., Yang, T., Bozhko, S., & Wheeler, P. (2019, October). Trade-off Study of a High Power Density Starter-Generator for Turboprop Aircraft System. Presented at 45th Annual Conference of the IEEE Industrial Electronics Society (IECON 2019), Lisbon, Portugal

Mechanically-driven actuators, compressors and pumps are being replaced by the aircraft manufacturers that shift the trend towards 'More Electric Aircraft' and hence reducing the mechanical linkages within the aircraft system. This elevates the depen... Read More about Trade-off Study of a High Power Density Starter-Generator for Turboprop Aircraft System.

Enhancing the Torque Density of Conventional PM-SynRel Machine with Hybrid Flux Barrier (2019)
Presentation / Conference Contribution
Kumar, R. M. R., Vakil, G., Gerada, D., Walker, A., La Rocca, S., Al-Ani, M., Gerada, C., Paciura, K., McQueen, A., & Fernandes, B. G. (2019, October). Enhancing the Torque Density of Conventional PM-SynRel Machine with Hybrid Flux Barrier. Presented at 45th Annual Conference of the IEEE Industrial Electronics Society (IECON 2019), Lisbon, Portugal

Electrical machines with high torque density are required for traction application. Availability of bonded magnets with complex shapes and magnetization pattern can significantly extend the design space of electrical machines. This paper introduces a... Read More about Enhancing the Torque Density of Conventional PM-SynRel Machine with Hybrid Flux Barrier.

High Power High Speed PM-Assisted SynRel Machines with Ferrite and Rare Earth Magnets for Future Electric Commercial Vehicles (2019)
Presentation / Conference Contribution
Kumar, R. M. R., Zou, T., La Rocca, A., Vakil, G., Gerada, D., Walker, A., Gerada, C., Paciura, K., McQueen, A., & Fernandes, B. G. (2019, October). High Power High Speed PM-Assisted SynRel Machines with Ferrite and Rare Earth Magnets for Future Electric Commercial Vehicles. Presented at 45th Annual Conference of the IEEE Industrial Electronics Society (IECON 2019), Lisbon, Portugal

High power density and high torque density are the fundamental requirements for electric machines used in traction application. The former is obtained by potentially increasing the speed of the machine while the latter by using high energy density ra... Read More about High Power High Speed PM-Assisted SynRel Machines with Ferrite and Rare Earth Magnets for Future Electric Commercial Vehicles.

Rotor UMP & Mechanical Response in HSPMSM in Typical Running Conditions (2019)
Presentation / Conference Contribution
He, Y.-L., Vakil, G., Zhang, X.-C., Gao, P., Gerada, D., & Gerada, C. (2019, September). Rotor UMP & Mechanical Response in HSPMSM in Typical Running Conditions. Presented at 2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019, Baltimore, MD, USA

This paper presents a comprehensive analysis on the rotor unbalanced magnetic pull (UMP) and the consequent mechanical response in 6 typical running conditions in a 20000 rpm high speed permanent magnet synchronous motor (HSPMSM) through finite eleme... Read More about Rotor UMP & Mechanical Response in HSPMSM in Typical Running Conditions.

Optimized Carrier Disposition Based Discontinuous Pulse-width Modulation Method for three-level NPC Converters (2019)
Presentation / Conference Contribution
Wang, M., Xu, L., Yang, B., Li, J., Gu, C., Zhang, H., Gerada, C., & Li, Y. (2019, September). Optimized Carrier Disposition Based Discontinuous Pulse-width Modulation Method for three-level NPC Converters. Presented at IEEE Energy Conversion Congress and Exposition (ECCE 2019 ), Baltimore, MD, USA

Three level neutral-point-clamped (3L-NPC) converter is a multilevel topology that is well-suited solution in high voltage, high frequency applications such as flexible AC transmission systems and electric vehicle drive systems. This paper is focused... Read More about Optimized Carrier Disposition Based Discontinuous Pulse-width Modulation Method for three-level NPC Converters.

A Novel Modelling Approach of Modular Multi Three-phase Drive System for High Performance Applications (2019)
Presentation / Conference Contribution
Wang, X., Gu, C., Buticchi, G., Zhang, H., & Gerada, C. (2019, August). A Novel Modelling Approach of Modular Multi Three-phase Drive System for High Performance Applications. Presented at 2019 22nd International Conference on Electrical Machines and Systems (ICEMS), Harbin, China

There is a growing attention in the industrial and academic sectors for the multi-phase drive for high power and high-speed applications. The multi three-phase drive with independent neutral points is a popular option for this application, as it allo... Read More about A Novel Modelling Approach of Modular Multi Three-phase Drive System for High Performance Applications.

Comparative Analysis of AC losses with round magnet wire and Litz wire winding of a High – Speed PM Machine (2019)
Presentation / Conference Contribution
Bardalai, A., Zhang, X., Zou, T., Gerada, D., Li, J., & Gerada, C. (2019, August). Comparative Analysis of AC losses with round magnet wire and Litz wire winding of a High – Speed PM Machine. Presented at 2019 22nd International Conference on Electrical Machines and Systems (ICEMS), Harbin, China

The growing trend of high speed, high power density machines for applications such as EVs, aerospace and machine tools demand these machines to work at higher electrical frequencies. Meanwhile, increasing the fundamental frequency leads to pronounced... Read More about Comparative Analysis of AC losses with round magnet wire and Litz wire winding of a High – Speed PM Machine.

Dual-Pulse Mode Control of a High-Speed Doubly Salient Electromagnetic Machine for Loss Reduction and Speed Range Extension (2019)
Journal Article
Yu, L., Zhang, Z., Bian, Z., Gerada, D., & Gerada, C. (2019). Dual-Pulse Mode Control of a High-Speed Doubly Salient Electromagnetic Machine for Loss Reduction and Speed Range Extension. IEEE Transactions on Industrial Electronics, 67(6), 1-10. https://doi.org/10.1109/tie.2019.2931253

In this paper, a dual-pulse mode control of a high-speed doubly salient electromagnetic machine (DSEM) for efficiency improvement over a wide speed range is investigated and implemented. The dual-pulse mode control method and operation principle are... Read More about Dual-Pulse Mode Control of a High-Speed Doubly Salient Electromagnetic Machine for Loss Reduction and Speed Range Extension.

Challenges of the optimization of a high-speed induction machine for naval applications (2019)
Journal Article
Buticchi, G., Gerada, D., Alberti, L., Galea, M., Wheeler, P., Bozhko, S., Peresada, S., Zhang, H., Zhang, C., & Gerada, C. (2019). Challenges of the optimization of a high-speed induction machine for naval applications. Energies, 12(12), Article 2431. https://doi.org/10.3390/en12122431

In several industrial sectors, induction machines are being replaced with permanent magnet based alternatives, owing to the potential for higher power density and efficiency. However, high-speed applications feature a wide flux-weakening region, wher... Read More about Challenges of the optimization of a high-speed induction machine for naval applications.

Active Thermal Control for Power Converters in Modular Winding Permanent Magnet Synchronous Motor (2019)
Presentation / Conference Contribution
Yan, H., Buticchi, G., Yang, J., Zhao, W., Zhang, H., & Gerada, C. (2019, April). Active Thermal Control for Power Converters in Modular Winding Permanent Magnet Synchronous Motor. Presented at IEEE 13th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG 2019), Sonderborg, Denmark

To increase the reliability and reduce the torque ripple, modular winding structure has been employed in the Permanent Magnet Synchronous Motors (PMSMs). However, the reliability of the motor system depends on the lifetime of the power semiconductor... Read More about Active Thermal Control for Power Converters in Modular Winding Permanent Magnet Synchronous Motor.

Asymmetrical Flux Density Distribution in Stator Teeth of Surface Permanent Magnet Machines (2019)
Presentation / Conference Contribution
Sala, G., De Gaetano, D., Degano, M., & Gerada, C. (2019, April). Asymmetrical Flux Density Distribution in Stator Teeth of Surface Permanent Magnet Machines. Presented at IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD 2019), Athens, Greece

This work is showing in detail the flux density behaviour in the stator teeth of a synchronous machine. A 3-phase Surface Permanent Magnet (SPM) motor is considered. These motors are widely employed in applications where high efficiency and power den... Read More about Asymmetrical Flux Density Distribution in Stator Teeth of Surface Permanent Magnet Machines.

Simplified Damper Cage Circuital Model and Fast Analytical–Numerical Approach for the Analysis of Synchronous Generators (2018)
Journal Article
Nuzzo, S., Bolognesi, P., Gerada, C., & Galea, M. (2019). Simplified Damper Cage Circuital Model and Fast Analytical–Numerical Approach for the Analysis of Synchronous Generators. IEEE Transactions on Industrial Electronics, 66(11), 8361-8371. https://doi.org/10.1109/tie.2018.2885737

The long and enduring history of utilization of the wound-field synchronous generator in a large number of applications makes it one of the most known and consolidated electrical machine technologies. Thus, its design, modeling, and analysis processe... Read More about Simplified Damper Cage Circuital Model and Fast Analytical–Numerical Approach for the Analysis of Synchronous Generators.

Synchronous Reluctance Motor Iron Losses: Analytical Model and Optimization (2018)
Presentation / Conference Contribution
Mahmoud, H., Degano, M., Bacco, G., Bianchi, N., & Gerada, C. (2018, September). Synchronous Reluctance Motor Iron Losses: Analytical Model and Optimization. Presented at 2018 IEEE Energy Conversion Congress and Exposition (ECCE), Portland, Oregon, USA

The complex rotor structure of synchronous reluctance machines causes a high harmonic content in the air-gap flux density and then flux density fluctuations in different iron parts. The importance of determining accurately the total iron losses in th... Read More about Synchronous Reluctance Motor Iron Losses: Analytical Model and Optimization.

Design Considerations of Fault-Tolerant Electromechanical Actuator Systems for More Electric Aircraft (MEA) (2018)
Presentation / Conference Contribution
Zhu, S., Cox, T., Xu, Z., Gerada, C., & Li, C. (2018, September). Design Considerations of Fault-Tolerant Electromechanical Actuator Systems for More Electric Aircraft (MEA). Presented at IEEE Energy Conversion Congress and Exposition ( ECCE 2018), Portland, OR

This paper studies the concerns such as architecture and reliability in the deployment of electromechanical actuator (EMA) in the actuation system for more electric aircraft (MEA). First, the reliability of the actuation system architecture such as c... Read More about Design Considerations of Fault-Tolerant Electromechanical Actuator Systems for More Electric Aircraft (MEA).

Performance Analysis of PMSM for High-Speed Starter-Generator System (2018)
Presentation / Conference Contribution
Diab, A., Gerada, C., Rashed, M., Bozhko, S., & Li, J. (2018, November). Performance Analysis of PMSM for High-Speed Starter-Generator System. Presented at 2018 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC), Nottingham, UK

© 2018 IEEE. This paper presents the operating characteristics of surface-mounted permanent magnet synchronous machine taking into account the influence of stator resistance and inductance variation at high frequencies, whose effect are always neglec... Read More about Performance Analysis of PMSM for High-Speed Starter-Generator System.