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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). Challenges and Future opportunities of Hairpin Technologies. . https://doi.org/10.1109/ISIE45063.2020.9152417

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.

Analysis and Modelling of High Frequency Effects on Synchronous Generator’s Armature Conductors (2020)
Presentation / Conference Contribution
Quadri, Q. H., Nuzzo, S., Gerada, C., & Galea, M. (2020). Analysis and Modelling of High Frequency Effects on Synchronous Generator’s Armature Conductors. In 2020 IEEE 29th International Symposium on Industrial Electronics (ISIE) (253-258). https://doi.org/10.1109/ISIE45063.2020.9152456

This paper investigates the accuracy of the subdomain modelling technique for high frequency copper loss calculation in stator windings of synchronous generators. The methodology's accuracy is studied at a slot level up to 10 kHz against FE model wit... Read More about Analysis and Modelling of High Frequency Effects on Synchronous Generator’s Armature Conductors.

A Hybrid Computational Tool to Analyze the Performance of Electric Machines with Reduced Content of Permanent Magnet (2020)
Presentation / Conference Contribution
Ram Kumar, R. M., Khowja, M. R., Vakil, G., Gerada, D., Gerada, C., Paciura, K., & Fernandes, B. G. (2020). A Hybrid Computational Tool to Analyze the Performance of Electric Machines with Reduced Content of Permanent Magnet. In 2020 IEEE Transportation Electrification Conference & Expo (ITEC) (340-345). https://doi.org/10.1109/itec48692.2020.9161631

Electric vehicles (EVs) are equipped with interior permanent magnet (IPM) or permanent magnet assisted synchronous reluctance (PM-SynRel) machines because of their superior performance in field weakening region. The effect of saturation is more prono... Read More about A Hybrid Computational Tool to Analyze the Performance of Electric Machines with Reduced Content of Permanent Magnet.

Novel Permanent Magnet Synchronous Motor with Integrated Filter Inductor Using Motor's Inherent Magnetics (2020)
Journal Article
Khowja, M. R., Gerada, C., Vakil, G., Patel, C., Odhano, S. A., Walker, A., & Wheeler, P. (2021). Novel Permanent Magnet Synchronous Motor with Integrated Filter Inductor Using Motor's Inherent Magnetics. IEEE Transactions on Industrial Electronics, 68(7), 5638-5649. https://doi.org/10.1109/tie.2020.3000110

A close functional and structural integration of passive elements is required to improve the power density of motor drives. Such power-dense motor drives are prerequisites in aerospace and automotive applications. This article presents a permanent ma... Read More about Novel Permanent Magnet Synchronous Motor with Integrated Filter Inductor Using Motor's Inherent Magnetics.

Performance Enhancement of Direct Torque-Controlled Permanent Magnet Synchronous Motor with a Flexible Switching Table (2020)
Journal Article
Nasr, A., Gu, C., Bozhko, S., & Gerada, C. (2020). Performance Enhancement of Direct Torque-Controlled Permanent Magnet Synchronous Motor with a Flexible Switching Table. Energies, 13(8), Article 1907. https://doi.org/10.3390/en13081907

In this paper, a flexible switching table (FST) for direct torque control (DTC) of permanent magnet synchronous motors (PMSMs) was proposed to enhance the steady-state and dynamic performances of the drive system. First, the influence of each convert... Read More about Performance Enhancement of Direct Torque-Controlled Permanent Magnet Synchronous Motor with a Flexible Switching Table.

Analytical Model of Modular Spoke-Type Permanent Magnet Machines for In-Wheel Traction Applications (2020)
Journal Article
Zhang, H., Hua, W., Gerada, D., Xu, Z., & Gerada, C. (2020). Analytical Model of Modular Spoke-Type Permanent Magnet Machines for In-Wheel Traction Applications. IEEE Transactions on Energy Conversion, 35(3), 1289-1300. https://doi.org/10.1109/tec.2020.2979886

This paper proposes an analytical model of modular spoke-type permanent magnet (MSTPM) machines based on air-gap field modulation (AFM) theory. Firstly, a fundamental AFM model of open-circuit MSTPM machines is introduced. The open-circuit air-gap fi... Read More about Analytical Model of Modular Spoke-Type Permanent Magnet Machines for In-Wheel Traction Applications.

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.

Speed Ripple Reduction of Direct-Drive PMSM Servo System at Low-Speed Operation Using Virtual Cogging Torque Control Method (2020)
Journal Article
Bu, F., Yang, Z., Gao, Y., Pan, Z., Pu, T., Degano, M., & Gerada, C. (2021). Speed Ripple Reduction of Direct-Drive PMSM Servo System at Low-Speed Operation Using Virtual Cogging Torque Control Method. IEEE Transactions on Industrial Electronics, 68(1), 160-174. https://doi.org/10.1109/tie.2019.2962400

This paper presents a virtual cogging torque (VCT) control method to reduce the speed ripple of direct-drive permanent magnet synchronous machine (DD-PMSM) servo system under low-speed conditions. Compared with other factors, at low speeds, the coggi... Read More about Speed Ripple Reduction of Direct-Drive PMSM Servo System at Low-Speed Operation Using Virtual Cogging Torque Control Method.

Sensitivity Analysis of Machine Components Thermal Properties Effects on Winding Temperature (2019)
Presentation / Conference Contribution
Zhang, F., Gerada, D., Xu, Z., Zhang, H., & Gerada, C. (2019). Sensitivity Analysis of Machine Components Thermal Properties Effects on Winding Temperature. In 2019 22nd International Conference on Electrical Machines and Systems (ICEMS). https://doi.org/10.1109/ICEMS.2019.8922095

This paper investigates the sensitivity analysis of winding temperature to key parameters in electrical machine thermal design. With a validated 3D thermal model based on an existing 75kW traction machine for an electric vehicle, the methodology of t... Read More about Sensitivity Analysis of Machine Components Thermal Properties Effects on Winding Temperature.

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). Trade-off Study of a High Power Density Starter-Generator for Turboprop Aircraft System. In Proceedings: IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society (1435-1440). https://doi.org/10.1109/IECON.2019.8926961

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.

Analytical Tool to Generate Torque-Speed Characteristics for Surface Mounted PM Machines in Constant Torque and Field Weakening Regions (2019)
Presentation / Conference Contribution
Khowja, M. R., Vakil, G., & Gerada, C. (2019). Analytical Tool to Generate Torque-Speed Characteristics for Surface Mounted PM Machines in Constant Torque and Field Weakening Regions. In Proceedings: IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society (922-927). https://doi.org/10.1109/IECON.2019.8927436

This paper presents an analytical tool to generate torque vs speed characteristics of the surface-mounted permanent magnet machines to minimize the computation time and efforts. The paper also derives an expression of d-axis current in the field weak... Read More about Analytical Tool to Generate Torque-Speed Characteristics for Surface Mounted PM Machines in Constant Torque and Field Weakening Regions.

Fault-Tolerant Electrical Machines for Transport Applications (2019)
Presentation / Conference Contribution
Ismagilov, F., Gerada, C., Degano, M., Gurevich, O., Guliyenko, A., Vavilov, V., & Gusakov, D. (2019). Fault-Tolerant Electrical Machines for Transport Applications. . https://doi.org/10.1109/ICOECS46375.2019.8949914

This paper provides an overview of-fault-Tolerant electric machine for transport applications. A number of motor failure cases and methods to prevent or minimize their impact on the drive system are considered. The fault tolerance of bearings, stator... Read More about Fault-Tolerant Electrical Machines for Transport Applications.

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., …Li, Y. (2019). Optimized Carrier Disposition Based Discontinuous Pulse-width Modulation Method for three-level NPC Converters. In 2019 IEEE Energy Conversion Congress and Exposition (ECCE) (1442-1446). https://doi.org/10.1109/ECCE.2019.8912600

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.

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). Rotor UMP & Mechanical Response in HSPMSM in Typical Running Conditions. In Proceedings: 2019 IEEE Energy Conversion Congress and Exposition (ECCE) (3878-3883). https://doi.org/10.1109/ECCE.2019.8913180

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.

Equivalent Slot Thermal Conductivity and Back-iron Extension Effects on Machine Cooling (2019)
Presentation / Conference Contribution
Zhang, F., Gerada, D., Xu, Z., Zhang, H., & Gerada, C. (2019). Equivalent Slot Thermal Conductivity and Back-iron Extension Effects on Machine Cooling. In Proceedings of 2019 22nd International Conference on Electrical Machines and Systems (ICEMS). https://doi.org/10.1109/ICEMS.2019.8921725

Back-iron Extension (BIE) is an effective thermal management technique which reduces the winding temperatures by projecting part of the back iron into the center of slot, thereby shortening the heat transfer path between the coil and back iron. Based... Read More about Equivalent Slot Thermal Conductivity and Back-iron Extension Effects on Machine Cooling.

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). A Novel Modelling Approach of Modular Multi Three-phase Drive System for High Performance Applications. In 2019 22nd International Conference on Electrical Machines and Systems (ICEMS) (1-5). https://doi.org/10.1109/ICEMS.2019.8922523

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.

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.

Internal Current Return Path for Ground Leakage Current Mitigation in Current Source Inverters (2019)
Journal Article
Lorenzani, E., Migliazza, G., Immovilli, F., Gerada, C., Zhang, H., & Buticchi, G. (2019). Internal Current Return Path for Ground Leakage Current Mitigation in Current Source Inverters. IEEE Access, 7, 96540-96548. https://doi.org/10.1109/access.2019.2929062

This paper analyzes in detail the effect of a simple solution for ground leakage current mitigation applicable to transformerless three-phase current source inverter (CSI). The circuit modification solution is assessed for both traditional CSI topolo... Read More about Internal Current Return Path for Ground Leakage Current Mitigation in Current Source Inverters.

Comparative study on two modular spoke-type PM machines for in-wheel traction applications (2019)
Journal Article
Zhang, H., Hua, W., Gerada, D., Gerada, C., Li, Y., & Zhang, G. (2019). Comparative study on two modular spoke-type PM machines for in-wheel traction applications. IEEE Transactions on Energy Conversion, 34(4), 2137-2147. https://doi.org/10.1109/tec.2019.2927872

This paper focuses on the comparative analysis of modular spoke-type permanent magnet machines with two magnetization modes, which are referred to as M-I and M-II types. The analytical models of the proposed machines are built based on the simple mag... Read More about Comparative study on two modular spoke-type PM machines for in-wheel traction applications.