Professor DAVID GERADA's Outputs (135)

A comprehensive study on stator vibrations in synchronous generators considering both single and combined SAGE cases (2022)
Journal Article
Zhang, W., He, Y.-L., Xu, M.-X., Zheng, W.-J., Sun, K., Wang, H.-P., & Gerada, D. (2022). A comprehensive study on stator vibrations in synchronous generators considering both single and combined SAGE cases. International Journal of Electrical Power and Energy Systems, 143, Article 108490. https://doi.org/10.1016/j.ijepes.2022.108490

This paper presents a comprehensive study on the stator vibration properties in synchronous generators under varied static air–gap eccentricity (SAGE) conditions. Current studies mainly focus on the electromechanical and thermal properties such as st... Read More about A comprehensive study on stator vibrations in synchronous generators considering both single and combined SAGE cases.

Analysis of the Flux Density and Back EMF in Eccentric Permanent Magnet Machines Based on 2-D Air-Gap Modulation Theory (2022)
Journal Article
Zhang, H., Wang, Y., Hua, W., Gerada, D., & Cheng, M. (2022). Analysis of the Flux Density and Back EMF in Eccentric Permanent Magnet Machines Based on 2-D Air-Gap Modulation Theory. IEEE Transactions on Transportation Electrification, 8(4), 4325-4336. https://doi.org/10.1109/tte.2022.3190728

In this article, the unified 2-D air-gap field modulation (AFM) model is established to analyze the flux density and back electromagnetic force (EMF) in both rotor-permanent magnet (PM) and stator-PM machines under eccentricity. For the temporal dist... Read More about Analysis of the Flux Density and Back EMF in Eccentric Permanent Magnet Machines Based on 2-D Air-Gap Modulation Theory.

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.

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., & Geradab, C. (2022). Decoupled Discrete Current Control for AC Drives at Low Sampling-to-Fundamental Frequency Ratios. IEEE Journal of Emerging and Selected Topics in Power Electronics, 11(2), https://doi.org/10.1109/jestpe.2022.3179184

Implementation of proportional-integral (PI) controllers in synchronous reference frame (SRF) is a well-established current control solution for electric drives. It is a general and effective method in digital control as long as the ratio of Sampling... Read More about Decoupled Discrete Current Control for AC Drives at Low Sampling-to-Fundamental Frequency Ratios.

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.

Improvements on permanent magnet synchronous motor by integrating heat pipes into windings for solar unmanned aerial vehicle (2022)
Journal Article
Zhang, C., Zhang, X., Zhao, F., Gerada, D., & Li, L. (2022). Improvements on permanent magnet synchronous motor by integrating heat pipes into windings for solar unmanned aerial vehicle. Green Energy and Intelligent Transportation, 1(1), Article 100011. https://doi.org/10.1016/j.geits.2022.100011

The successful market uptake of all-electric propulsion systems is closely related to the performance metrics of the electrical motor used within. In light of this, various road-maps have been set for the next two decades by aerospace and automotive... Read More about Improvements on permanent magnet synchronous motor by integrating heat pipes into windings for solar unmanned aerial vehicle.

Impact of Stator Segmentation on the Performance of Aerospace Propulsion Machines (2022)
Presentation / Conference Contribution
Ramanathan Mathavan Jeyabalan, R. K., Vakil, G., Gerada, D., Gerada, C., & Minshull, J. Impact of Stator Segmentation on the Performance of Aerospace Propulsion Machines. Presented at AeroTech, Pasadena California, United States

Electric machines offering a high power density are required for aerospace applications. Soft magnetic material with a high saturation flux density is one of the key component which is required to realize these power density targets. The need for a h... Read More about Impact of Stator Segmentation on the Performance of Aerospace Propulsion Machines.

A Comprehensive Design Guideline of Hairpin Windings for High Power Density Electric Vehicle Traction Motors (2022)
Journal Article
Zou, T., Gerada, D., La Rocca, A., Moslemin, M., Cairns, A., Cui, M., Bardalai, A., Zhang, F., & Gerada, C. (2022). A Comprehensive Design Guideline of Hairpin Windings for High Power Density Electric Vehicle Traction Motors. IEEE Transactions on Transportation Electrification, 8(3), 3578-3593. https://doi.org/10.1109/TTE.2022.3149786

The rapidly increasing demand on power density levels of electric vehicle (EV) drive systems is pushing the boundaries of traction motor performance. Hairpin windings are becoming a popular option for EV motors due to their reduced DC losses and impr... Read More about A Comprehensive Design Guideline of Hairpin Windings for High Power Density Electric Vehicle Traction Motors.

Performance Entitlement by Using Novel High Strength Electrical Steels and Copper Alloys for High-Speed Laminated Rotor Induction Machines (2022)
Journal Article
Zhang, F., Gerada, D., Xu, Z., He, Y., Zhang, H., Hua, W., & Gerada, C. (2022). Performance Entitlement by Using Novel High Strength Electrical Steels and Copper Alloys for High-Speed Laminated Rotor Induction Machines. Electronics, 11(2), 210. https://doi.org/10.3390/electronics11020210

The laminated rotor Induction Machine (IM), with its simple construction and manufacturing, robustness, ease of control and comparatively lower cost remains by far the most utilized electromechanical energy converter. At very high speeds, traditional... Read More about Performance Entitlement by Using Novel High Strength Electrical Steels and Copper Alloys for High-Speed Laminated Rotor Induction Machines.

Impact of Static Air-Gap Eccentricity on Thermal Responses of Stator Winding Insulation in Synchronous Generators (2021)
Journal Article
He, Y.-L., Sun, K., Wu, Y., Zhao, H.-S., Wang, X.-L., Gerada, C., & Gerada, D. (2022). Impact of Static Air-Gap Eccentricity on Thermal Responses of Stator Winding Insulation in Synchronous Generators. IEEE Transactions on Industrial Electronics, 69(12), 13544-13554. https://doi.org/10.1109/TIE.2021.3135627

In this article, we present a comprehensive analysis on the thermal response characteristics of the stator winding insulation under static air-gap eccentricity (SAGE) conditions in synchronous generators. Different from previous studies, this article... Read More about Impact of Static Air-Gap Eccentricity on Thermal Responses of Stator Winding Insulation in Synchronous Generators.

Carbon Emission Analysis of Electrical Machines (2021)
Presentation / Conference Contribution
Zhang, X., Xu, Z., Gerada, C., & Gerada, D. (2021, October). Carbon Emission Analysis of Electrical Machines. Presented at 24th International Conference on Electrical Machines and Systems (ICEMS 2021), Gyeongju, Korea, Republic of

The industry places increased importance on carbon reduction. Many are focused on lowering the fuel consumption of electrical machines, however, carbon emissions from the acquisition of raw materials and the energy consumption of manufacturing proces... Read More about Carbon Emission Analysis of Electrical Machines.

Significance of Anisotropic Thermal Expansion in High Speed Electric Machines Employing NdFeB Permanent Magnets (2021)
Journal Article
Kumar, R., La Rocca, A., Vakil, G., Gerada, D., Gerada, C., & Fernandes, B. G. (2021). Significance of Anisotropic Thermal Expansion in High Speed Electric Machines Employing NdFeB Permanent Magnets. Energies, 14(22), Article 7558. https://doi.org/10.3390/en14227558

Many high speed applications employ a surface permanent magnet (PM) machine topology with a retaining sleeve due to its robustness and ability to achieve high overall peripheral speeds as well as efficiencies. One often overlooked feature in the mech... Read More about Significance of Anisotropic Thermal Expansion in High Speed Electric Machines Employing NdFeB Permanent Magnets.

A critical review on thermal management technologies for motors in electric cars (2021)
Journal Article
Wang, X., Li, B., Gerada, D., Huang, K., Stone, I., Worrall, S., & Yan, Y. (2022). A critical review on thermal management technologies for motors in electric cars. Applied Thermal Engineering, 201(Part A), Article 117758. https://doi.org/10.1016/j.applthermaleng.2021.117758

The development of electric cars has well been regarded as a major solution for tackling the challenges of carbon-neutrality faced by the modern communities. Electric motor is certainly the core and most important components of an electric car, and t... Read More about A critical review on thermal management technologies for motors in electric cars.

Rotor loss and temperature variation under single and combined faults composed of static air-gap eccentricity and rotor inter-turn short circuit in synchronous generators (2021)
Journal Article
He, Y. L., Zhang, W., Xu, M. X., Tao, W. Q., Liu, H. L., Dou, L. J., Wan, S. T., Li, J. Q., & Gerada, D. (2021). Rotor loss and temperature variation under single and combined faults composed of static air-gap eccentricity and rotor inter-turn short circuit in synchronous generators. IET Electric Power Applications, 15(11), 1529-1546. https://doi.org/10.1049/elp2.12118

In this study, the rotor loss as well as the temperature variations due to the static air-gap eccentricity (SAGE) and the rotor inter-turn short circuit (RISC) in synchronous generators is presented. Different from the previous studies, this study in... Read More about Rotor loss and temperature variation under single and combined faults composed of static air-gap eccentricity and rotor inter-turn short circuit in synchronous generators.

Design of Rare-Earth-Free PM-assisted Synchronous Reluctance Machine for Heavy-duty Automotive Application (2021)
Presentation / Conference Contribution
Al-ani, M., La Rocca, S., La Rocca, A., Walker, A., Ramanathan, R., Zou, T., Vakil, G., Gerada, D., Gerada, C., Paciura, K., & McQueen, A. (2020, December). Design of Rare-Earth-Free PM-assisted Synchronous Reluctance Machine for Heavy-duty Automotive Application. Presented at The 10th International Conference on Power Electronics, Machines and Drives (PEMD 2020), Online Conference

Electrical machines designed for automotive applications are characterised by high torque density, wide speed range and low cost. The use of NdFeB magnets in such machines can achieve the required high torque density and wide speed range, however, it... Read More about Design of Rare-Earth-Free PM-assisted Synchronous Reluctance Machine for Heavy-duty Automotive Application.

Improved Thermal Modeling and Experimental Validation of Oil-Flooded High-Performance Machines with Slot-Channel Cooling (2021)
Journal Article
Zhang, F., Gerada, D., Xu, Z., Zhang, X., Zhang, H., Gerada, C., Zhu, M., Xia, L., Zhang, W., & Degano, M. (2022). Improved Thermal Modeling and Experimental Validation of Oil-Flooded High-Performance Machines with Slot-Channel Cooling. IEEE Transactions on Transportation Electrification, 8(1), 312-324. https://doi.org/10.1109/TTE.2021.3106819

Thermal management is often considered a bottleneck in the pursuit of the next-generation electrical machines for electrified transportation with a step change in power density. Slot-channel cooling is considered to be an effective cooling technique,... Read More about Improved Thermal Modeling and Experimental Validation of Oil-Flooded High-Performance Machines with Slot-Channel Cooling.

Segmented Hairpin Topology for Reduced Losses at High-Frequency Operations (2021)
Journal Article
Preci, E., Nuzzo, S., Valente, G., Gerada, D., Barater, D., Degano, M., Buticchi, G., & Gerada, C. (2022). Segmented Hairpin Topology for Reduced Losses at High-Frequency Operations. IEEE Transactions on Transportation Electrification, 8(1), 688-698. https://doi.org/10.1109/TTE.2021.3103821

Nowadays, one of the key challenges in transport electrification is the reduction of components’ size and weight. The electrical machine plays a relevant role in this regard. Designing machines with higher rotational speeds and excitation frequencies... Read More about Segmented Hairpin Topology for Reduced Losses at High-Frequency Operations.

A Novel Universal Model Considering SAGE for MFD-Based Faulty Property Analysis Under RISC in Synchronous Generators (2021)
Journal Article
He, Y.-L., Wang, Y., Jiang, H.-C., Gao, P., Yuan, X.-H., Gerada, D., & Liu, X.-Y. (2022). A Novel Universal Model Considering SAGE for MFD-Based Faulty Property Analysis Under RISC in Synchronous Generators. IEEE Transactions on Industrial Electronics, 69(7), 7415-7427. https://doi.org/10.1109/TIE.2021.3094481

This article proposes a new rotor interturn short circuit (RISC) fault analysis model for the electromechanical property study in synchronous generators. The specific novelty of this model lies in two aspects: First, It considers that most generators... Read More about A Novel Universal Model Considering SAGE for MFD-Based Faulty Property Analysis Under RISC in Synchronous Generators.

Electrical Machine Slot Thermal Condition Effects on Back Iron Extension Thermal Benefits (2021)
Journal Article
Zhang, F., Gerada, D., Xu, Z., Tighe, C., Zhang, H., Yan, L., & Gerada, C. (2021). Electrical Machine Slot Thermal Condition Effects on Back Iron Extension Thermal Benefits. IEEE Transactions on Transportation Electrification, 7(4), 2927-2938. https://doi.org/10.1109/tte.2021.3085822

The slot thermal condition is critical for thermal management of high-performance electrical machines, due to the high heat losses and poor heat transfer ability within the slot. With a part of the back iron projected radially downward into the slot,... Read More about Electrical Machine Slot Thermal Condition Effects on Back Iron Extension Thermal Benefits.