Professor CHRISTOPHER GERADA's Outputs (52)

Design procedure and optimisation methodology of permanent magnet synchronous machines with direct slot cooling for aviation electrification (2022)
Journal Article
Tameemi, A., Degano, M., Murataliyev, M., Di Nardo, M., Valente, G., Gerada, D., Xu, Z., & Gerada, C. (2023). Design procedure and optimisation methodology of permanent magnet synchronous machines with direct slot cooling for aviation electrification. IET Electric Power Applications, 17(4), 421-561. https://doi.org/10.1049/elp2.12281

Electric machines are widely employed in a variety of sectors, including automotive and aerospace industry. With the rising trend towards electrification in aviation, electric machines with increased power density and efficiency are becoming key enab... Read More about Design procedure and optimisation methodology of permanent magnet synchronous machines with direct slot cooling for aviation electrification.

AC/DC Converter Topologies Comparison for More Electric Aircraft Applications (2022)
Presentation / Conference Contribution
Khera, F. A., Gerada, C., Bozhko, S., & Wheeler, P. W. (2022, December). AC/DC Converter Topologies Comparison for More Electric Aircraft Applications. Presented at 7th IEEE Southern Power Electronics Conference (IEEE SPEC 2022), Nadi, Fiji

This paper compares the potential AC/DC power converter topologies that are appropriate for medium voltage and medium/high power aircraft applications. The power converter's rated power and the DC distribution voltage level in this application assume... Read More about AC/DC Converter Topologies Comparison for More Electric Aircraft Applications.

Single-Phase Short-Circuit Fault Tolerant Control for Five-Phase Permanent Magnet Machines With Copper Loss Reduction (2022)
Journal Article
Wang, H., Gu, C., Wang, S., Zhao, W., Bai, S., Buticchi, G., Gerada, C., & Zhang, H. (2022). Single-Phase Short-Circuit Fault Tolerant Control for Five-Phase Permanent Magnet Machines With Copper Loss Reduction. IEEE Transactions on Industrial Electronics, 70(11), 11087 - 11097. https://doi.org/10.1109/tie.2022.3231322

Five-phase machines represent a widely adopted choice for fault-tolerant applications due to their extra degrees of freedom. This article deals with the single-phase short-circuit fault tolerant control using original transformation matrix for five-p... Read More about Single-Phase Short-Circuit Fault Tolerant Control for Five-Phase Permanent Magnet Machines With Copper Loss Reduction.

Surface Permanent Magnet Synchronous Machines: High Speed Design and Limits (2022)
Journal Article
Gallicchio, G., Nardo, M. D., Palmieri, M., Ilkhani, M. R., Degano, M., Gerada, C., & Cupertino, F. (2023). Surface Permanent Magnet Synchronous Machines: High Speed Design and Limits. IEEE Transactions on Energy Conversion, 38(2), 1311-1324. https://doi.org/10.1109/tec.2022.3225224

Surface permanent magnet synchronous machines are one of the most widely adopted machine topologies in high-speed applications where efficiency and power factor cannot be compromised. Although the design of such machine type has been extensively inve... Read More about Surface Permanent Magnet Synchronous Machines: High Speed Design and Limits.

Airgap Length Analysis of a 350kW PM-Assisted Syn-Rel Machine for Heavy Duty EV Traction (2022)
Journal Article
Zou, T., Gerada, D., La Rocca, S., La Rocca, A., Walker, A., Vakil, G., Arevalo, . S. L., Xu, Z., Cui, M., Bardalai, A., Wang, M., Kumar, R. M. R., Marfoli, A., Paciura, . K., Barden, R., Ernest, E., Zhu, . S., Qayyum, N., McQueen, A., Zhang, F., & Gerada, C. (2023). Airgap Length Analysis of a 350kW PM-Assisted Syn-Rel Machine for Heavy Duty EV Traction. IEEE Transactions on Industry Applications, 59(2), 1557-1570. https://doi.org/10.1109/TIA.2022.3225255

Synchronous reluctance (Syn-Rel) machines with embedded permanent magnets (PMs) are research hotspots in variable speed motor drives due to their robust rotor structure and wide constant power speed range (CPSR). In this paper, the potential of PM-as... Read More about Airgap Length Analysis of a 350kW PM-Assisted Syn-Rel Machine for Heavy Duty EV Traction.

An Improved Control Strategy of PM-Assisted Synchronous Reluctance Machines Based on an Extended State Observer (2022)
Presentation / Conference Contribution
Li, D., Gu, C., Wang, S., Zhang, H., Gerada, C., Camilleri, R., & Zhang, Y. (2022, October). An Improved Control Strategy of PM-Assisted Synchronous Reluctance Machines Based on an Extended State Observer. Presented at 2022 IEEE Transportation Electrification Conference and Expo, Asia-Pacific (ITEC Asia-Pacific), Haining, China

PM-Assisted synchronous reluctance machines (PMSynRM) show large speed fluctuations and poor dynamic response when encountering a large disturbance. Additionally, the PI controller is not capable of eliminating steady-state errors when disturbances a... Read More about An Improved Control Strategy of PM-Assisted Synchronous Reluctance Machines Based on an Extended State Observer.

A Novel Airgap Permeance Modeling Approach for Magnetic Field Analysis of Electrical Machines Based on Electrostatic FEA (2022)
Presentation / Conference Contribution
Cui, M., Zou, T., Li, D., Gerada, D., Qu, R., & Gerada, C. (2022, October). A Novel Airgap Permeance Modeling Approach for Magnetic Field Analysis of Electrical Machines Based on Electrostatic FEA. Presented at IEEE Transportation Electrification Conference and Expo, Asia-Pacific (ITEC Asia-Pacific 2022), Haining, China

Detailed airgap permeance information is of great importance for analyzing the operation principle and optimizing the electromagnetic field distribution of an electric machine with unconventional topology. So far, analytical approaches upon calculati... Read More about A Novel Airgap Permeance Modeling Approach for Magnetic Field Analysis of Electrical Machines Based on Electrostatic FEA.

Sensorless control of IPMSM using a discrete-time super twisting observer by high-frequency current injection in low speed region (2022)
Journal Article
Xu, Z., & Gerada, C. (2022). Sensorless control of IPMSM using a discrete-time super twisting observer by high-frequency current injection in low speed region. Energy Reports, 8(Suppl 15), 650-657. https://doi.org/10.1016/j.egyr.2022.10.166

Control of interior permanent magnet synchronous motors (IPMSMs) has been extensively attempted without any position sensor. At extremely low speeds, sensorless operation would not rely on the fundamental model-based sensorless methods since the situ... Read More about Sensorless control of IPMSM using a discrete-time super twisting observer by high-frequency current injection in low speed region.

Dynamic power decoupling for low-voltage ride-through of grid-forming inverters (2022)
Journal Article
Ji, F., Xu, Z., & Gerada, C. (2022). Dynamic power decoupling for low-voltage ride-through of grid-forming inverters. Energy Reports, 8(Supplement 15), 247-258. https://doi.org/10.1016/j.egyr.2022.10.083

In grid-forming technologies, the power controllers emulate the operation of synchronous generator. The frequency regulation, power-decoupling and virtual inertia are mostly achieved on the basis of small-signal models. However, the transient power a... Read More about Dynamic power decoupling for low-voltage ride-through of grid-forming inverters.

Mitigation of AC Winding Losses for Aircraft Propulsion Motors (2022)
Presentation / Conference Contribution
Hebala, A., Nuzzo, S., Connor, P. H., Volpe, G., Gerada, C., & Galea, M. (2022, October). Mitigation of AC Winding Losses for Aircraft Propulsion Motors. Presented at IECON 2022 – 48th Annual Conference of the IEEE Industrial Electronics Society, Brussels, Belgium

In this paper, the AC copper losses are investigated and mitigated for different permanent magnet synchronous motor designs. AC copper losses can represent a substantial share of the total loss in electrical machines. In an application such as aerosp... Read More about Mitigation of AC Winding Losses for Aircraft Propulsion Motors.

Comparison of Aluminium and Copper Conductors in Hairpin Winding Design for High Power Density Traction Motors (2022)
Presentation / Conference Contribution
Petrelli, G., Cui, M., Zou, T., Sala, G., La Rocca, A., Barater, D., Franceschini, G., Gerada, D., Degano, M., & Gerada, C. (2022, September). Comparison of Aluminium and Copper Conductors in Hairpin Winding Design for High Power Density Traction Motors. Presented at International Conference on Electrical Machines (ICEM 2022), Valencia, Spain

Hairpin windings are becoming current/next generation solutions for traction motors of electric vehicles due to inherently reduced DC power losses and improved heat dissipation capability compared with random windings. Copper-based conductor has been... Read More about Comparison of Aluminium and Copper Conductors in Hairpin Winding Design for High Power Density Traction Motors.

Radial Force Analysis and Optimization of Interior Permanent Magnet Traction Motor for Reduction of Electromagnetic Vibration (2022)
Presentation / Conference Contribution
Li, H., Cui, M., Zou, T., Zhang, X., Zhang, H., Xu, Z., Gerada, D., & Gerada, C. (2022, September). Radial Force Analysis and Optimization of Interior Permanent Magnet Traction Motor for Reduction of Electromagnetic Vibration. Presented at International Conference on Electrical Machines (ICEM 2022), Valencia, Spain

Interior permanent magnet (IPM) machines are subject to rich harmonics of air-gap magnetic field, which correspond to electromagnetic forces and resulting noise, vibration, and harshness (NVH) issues. In this paper, the NVH issue is evaluated based o... Read More about Radial Force Analysis and Optimization of Interior Permanent Magnet Traction Motor for Reduction of Electromagnetic Vibration.

Thermal Contact Conductivity Prediction with Grey Box Model and Experimental Validation for an Axial Flux Motor (2022)
Presentation / Conference Contribution
Li, Z., Zhang, C., Zhang, F., Xu, Z., Gerada, D., Gerada, C., Li, X., Zhang, S., & Zhao, Y. (2022, October). Thermal Contact Conductivity Prediction with Grey Box Model and Experimental Validation for an Axial Flux Motor. Presented at 2022 IEEE Energy Conversion Congress and Exposition (ECCE), Detroit, MI, USA

Axial Flux Permanent Magnet Synchronous Motor (AFPMSM) attracts increased attention in recent years due to the inherent high torque density. The yokeless and segment armature is one of the most advanced structures, with reduced axial length and incre... Read More about Thermal Contact Conductivity Prediction with Grey Box Model and Experimental Validation for an Axial Flux Motor.

2-DOF Decoupled Discrete Current Control for AC Drives at Low Sampling-to-Fundamental Frequency Ratios (2022)
Journal Article
Wang, M., Buticchi, G., Li, J., Gu, C., Gerada, D., Degano, M., Xu, L., Li, Y., Zhang, H., & Gerada, C. (2023). 2-DOF Decoupled Discrete Current Control for AC Drives at Low Sampling-to-Fundamental Frequency Ratios. IEEE Transactions on Transportation Electrification, 9(2), 2048-2058. https://doi.org/10.1109/TTE.2022.3210909

In high performance drive systems, wide bandwidth and reference tracking accuracy of current control loop are fundamental requirements. The conventional PI controller provides robustness against the machine parameter mismatching and zero steady-state... Read More about 2-DOF Decoupled Discrete Current Control for AC Drives at Low Sampling-to-Fundamental Frequency Ratios.

Correction: Khowja et al. Integrated Motor Drive: Mass and Volume Optimization of the Motor with an Integrated Filter Inductor. Energies 2021, 14, 4564 (2022)
Journal Article
Khowja, M. R., Vakil, G., Gerada, C., Patel, C., Odhano, S., & Wheeler, P. (2022). Correction: Khowja et al. Integrated Motor Drive: Mass and Volume Optimization of the Motor with an Integrated Filter Inductor. Energies 2021, 14, 4564. Energies, 15(19), 6972. https://doi.org/10.3390/en15196972

Error in Figure The authors would like to replace Figure 1 (in the published paper [1]—Figure 1: Helicopter electromechanical actuation system). The newfigurewhich needs to be replaced and updated in themanuscript is shown below (Figure presented.). Read More about Correction: Khowja et al. Integrated Motor Drive: Mass and Volume Optimization of the Motor with an Integrated Filter Inductor. Energies 2021, 14, 4564.

Comparative Stability Analysis of Synchronous Reference Frame Current Controllers Operated at High Fundamental Frequency (2022)
Journal Article
Diab, A. M., Guo, F., Yeoh, S. S., Bozhko, S., Gerada, C., & Galea, M. (2022). Comparative Stability Analysis of Synchronous Reference Frame Current Controllers Operated at High Fundamental Frequency. IEEE Transactions on Transportation Electrification, 9(2), 2115 - 2128. https://doi.org/10.1109/TTE.2022.3208825

Synchronous reference frame (SRF) proportional-integral (PI) current controller (CC) is the most well-established solution for current regulation in AC machine drives and grid-connected voltage source converters. The design of high dynamic performanc... Read More about Comparative Stability Analysis of Synchronous Reference Frame Current Controllers Operated at High Fundamental Frequency.

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.

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.

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.

On the Fault Tolerance and PM Demagnetisation of a High-Performance Aircraft Propulsion Motor (2022)
Presentation / Conference Contribution
Hebala, A., Nuzzo, S., Connor, P. H., Gerada, C., & Galea, M. (2022, September). On the Fault Tolerance and PM Demagnetisation of a High-Performance Aircraft Propulsion Motor. Presented at 2022 International Conference on Electrical Machines (ICEM), Valencia, Spain

In this paper, a study of the fault-tolerance and demagnetisation of a high-performance aircraft propulsion motor is investigated. The motor is proposed with either three or four sets of three-phase windings, while maintaining the same magnetic and t... Read More about On the Fault Tolerance and PM Demagnetisation of a High-Performance Aircraft Propulsion Motor.