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High Power High Speed PM-Assisted SynRel Machines with Ferrite and Rare Earth Magnets for Future Electric Commercial Vehicles (2019)
Conference Proceeding
Kumar, R. M. R., Zou, T., La Rocca, A., Vakil, G., Gerada, D., Walker, A., …Fernandes, B. G. (2019). High Power High Speed PM-Assisted SynRel Machines with Ferrite and Rare Earth Magnets for Future Electric Commercial Vehicles. In IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society (1083-1088). https://doi.org/10.1109/IECON.2019.8927523

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.

Enhancing the Torque Density of Conventional PM-SynRel Machine with Hybrid Flux Barrier (2019)
Conference Proceeding
Kumar, R. M. R., Vakil, G., Gerada, D., Walker, A., La Rocca, S., Al-Ani, M., …Fernandes, B. G. (2019). Enhancing the Torque Density of Conventional PM-SynRel Machine with Hybrid Flux Barrier. In IECON 2019 Proceedings - 45th Annual Conference of the IEEE Industrial Electronics Society (4347-4352). https://doi.org/10.1109/IECON.2019.8926624

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.

Reduction of Winding AC Losses by Accurate Conductor Placement in High Frequency Electrical Machines (2019)
Journal Article
Bardalai, A., Gerada, D., Golovanov, D., Xu, Z., Zhang, X., Li, J., …Gerada, C. (2020). Reduction of Winding AC Losses by Accurate Conductor Placement in High Frequency Electrical Machines. IEEE Transactions on Industry Applications, 56(1), 183-193. https://doi.org/10.1109/TIA.2019.2947552

© 1972-2012 IEEE. In the design of electrical machines, the increase in power density has become one of the main research themes. With most of the power loss in high power density electrical machines often being generated in the stator winding assemb... Read More about Reduction of Winding AC Losses by Accurate Conductor Placement in High Frequency Electrical Machines.

Rotor UMP & Mechanical Response in HSPMSM in Typical Running Conditions (2019)
Conference Proceeding
He, Y., Vakil, G., Zhang, X., 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.

Optimized Carrier Disposition Based Discontinuous Pulse-width Modulation Method for three-level NPC Converters (2019)
Conference Proceeding
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.

Smart Current Limitation Technique for a Multiphase Bearingless Machine with Combined Winding System (2019)
Conference Proceeding
Wen, Z., Valente, G., Formentini, A., Papini, L., Zanchetta, P., & Gerada, C. (2019). Smart Current Limitation Technique for a Multiphase Bearingless Machine with Combined Winding System. In Proceedings of 2019 IEEE Energy Conversion Congress and Exposition (ECCE) (6099-6105). https://doi.org/10.1109/ECCE.2019.8913291

This paper presents a current limitation technique for a multiphase bearingless machine featuring a combined winding system. This winding structure allows each machine phase to produce both suspension force and motoring torque. Compared to more conve... Read More about Smart Current Limitation Technique for a Multiphase Bearingless Machine with Combined Winding System.

A Novel Modelling Approach of Modular Multi Three-phase Drive System for High Performance Applications (2019)
Conference Proceeding
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.

Thermal Barrier for High-Voltage Permanent Magnet Synchronous Motor with Air-cooling Hybrid Ventilation Systems (2019)
Conference Proceeding
Zhang, X., Zhang, H., Li, W., Gerada, C., Gerada, D., & Li, J. (2019). Thermal Barrier for High-Voltage Permanent Magnet Synchronous Motor with Air-cooling Hybrid Ventilation Systems. In Proceedings of the 22nd International Conference on Electrical Machines and Systems (ICEMS) (1-4). https://doi.org/10.1109/icems.2019.8922364

This paper addresses the thermal network improvement in a 315 kW high-voltage solid rotor permanent magnet synchronous motor, with a hybrid air-cooling system, by the proposed thermal barrier. The multi-coupled fields, as electromagnetic fields, flui... Read More about Thermal Barrier for High-Voltage Permanent Magnet Synchronous Motor with Air-cooling Hybrid Ventilation Systems.

Simplified Lumped Parameter Thermal Network for Short-Duty Dual Three-Phase Permanent Magnet Machines (2019)
Conference Proceeding
Giangrande, P., Madonna, V., Zhao, W., Wang, Y., Gerada, C., & Galea, M. (2019). Simplified Lumped Parameter Thermal Network for Short-Duty Dual Three-Phase Permanent Magnet Machines. In Proceedings of 2019 22nd International Conference on Electrical Machines and Systems (ICEMS) (1-6). https://doi.org/10.1109/ICEMS.2019.8922309

© 2019 IEEE. Electrical machines are progressively being employed in an ever-increasing number of safety-critical applications (e.g. aerospace and automotive), which demand high performance as well as reliability features. The modular structure and t... Read More about Simplified Lumped Parameter Thermal Network for Short-Duty Dual Three-Phase Permanent Magnet Machines.

Equivalent Slot Thermal Conductivity and Back-iron Extension Effects on Machine Cooling (2019)
Conference Proceeding
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.

Designing an Advanced Electrical Motor for Propulsion of Electric Aircraft (2019)
Conference Proceeding
Golovanov, D., Xu, Z., Gerada, D., Page, A., Gerada, C., & Sawata, T. (2019). Designing an Advanced Electrical Motor for Propulsion of Electric Aircraft. In AIAA Propulsion and Energy 2019 Forum. https://doi.org/10.2514/6.2019-4482

A prototype motor rated for 500 kW 3,000 rpm has been developed for aircraft electric propulsion. The design of the motor was optimized using a coupled parameter problem of electromagnetic, mechanical and thermal performances. A high power density of... Read More about Designing an Advanced Electrical Motor for Propulsion of Electric Aircraft.

Comparative Analysis of AC losses with round magnet wire and Litz wire winding of a High – Speed PM Machine (2019)
Conference Proceeding
Bardalai, A., Zhang, X., Zou, T., Gerada, D., Li, J., & Gerada, C. (2019). Comparative Analysis of AC losses with round magnet wire and Litz wire winding of a High – Speed PM Machine. In 2019 22nd International Conference on Electrical Machines and Systems (ICEMS). https://doi.org/10.1109/ICEMS.2019.8922173

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.

A SiC based 2-Level Power Converter for Shape-and-Space-Restricted Aerospace Applications (2019)
Conference Proceeding
Nasir, U., Chowdhury, S., La Rocca, A., Chen, Y., Yang, T., Wheeler, P., …Bozhko, S. (2019). A SiC based 2-Level Power Converter for Shape-and-Space-Restricted Aerospace Applications. In Proceedings on the 2019 IEEE 13th International Conference on Power Electronics and Drive Systems (PEDS) (1-7). https://doi.org/10.1109/PEDS44367.2019.8998907

Recent advancements in the power electronic device technologies, such as wide-band-gap devices including Silicon-Carbide (SiC) and Galium-Nitride (GaN), are acting as an enabling factor in development of compact power electronic systems. More specifi... Read More about A SiC based 2-Level Power Converter for Shape-and-Space-Restricted Aerospace Applications.

Torque Ripple Reduction in Sectored Multi Three-Phase Machines Based on PWM Carrier Phase Shift (2019)
Journal Article
Wang, X., Sala, G., Zhang, H., Gu, C., Buticchi, G., Formentini, A., …Wheeler, P. (2020). Torque Ripple Reduction in Sectored Multi Three-Phase Machines Based on PWM Carrier Phase Shift. IEEE Transactions on Industrial Electronics, 67(6), 4315-4325. https://doi.org/10.1109/TIE.2019.2931239

The interest in multiphase machines for high power and reliable drives has been growing, and many control algorithms have been proposed to improve their torque performance. This work presents a new approach to the modeling of a multi three-phase driv... Read More about Torque Ripple Reduction in Sectored Multi Three-Phase Machines Based on PWM Carrier Phase Shift.

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.

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., …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.

Layered Al2O3-SiO2 and Al2O3-Ta2O5 thin-film composites for high dielectric strength, deposited by pulsed direct current and radio frequency magnetron sputtering (2019)
Journal Article
Hanby, B. V., Stuart, B. W., Gimeno-Fabra, M., Moffat, J., Gerada, C., & Grant, D. M. (2019). Layered Al2O3-SiO2 and Al2O3-Ta2O5 thin-film composites for high dielectric strength, deposited by pulsed direct current and radio frequency magnetron sputtering. Applied Surface Science, 492, 328-336. https://doi.org/10.1016/j.apsusc.2019.06.202

Multilayer thin films have the potential to act as high dielectric strength insulation for wire and microelectronics. In this study, films consisting of 2, 4 or 8 layers, composed of Al2O3 with SiO2 or Ta2O5, were prepared via pulsed direct current a... Read More about Layered Al2O3-SiO2 and Al2O3-Ta2O5 thin-film composites for high dielectric strength, deposited by pulsed direct current and radio frequency magnetron sputtering.