Dr ZEYUAN XU's Outputs (56)

A PM-Assisted Synchronous Reluctance Motor with Two Slot-Pitch Winding (2020)
Presentation / Conference Contribution
Zhu, S., Cox, T., Xu, Z., & Gerada, C. (2020, November). A PM-Assisted Synchronous Reluctance Motor with Two Slot-Pitch Winding. Presented at 2020 23rd International Conference on Electrical Machines and Systems (ICEMS), Hamamatsu, Japan

This paper presents a novel electric motor solution to tackle the increasing demand on the traction motor for electric vehicles. The proposed electric motor has a 24 slots 10 poles fractional slot two-slot pitch winding and a PM-assisted synchronous... Read More about A PM-Assisted Synchronous Reluctance Motor with Two Slot-Pitch Winding.

Comparison of slotted and slotless PM machines for high kW/kg aerospace applications (2020)
Presentation / Conference Contribution
Dave, N., Vakil, G., Xu, Z., Gerada, C., Zhang, H., & Gerada, D. (2020, November). Comparison of slotted and slotless PM machines for high kW/kg aerospace applications. Presented at 2020 23rd International Conference on Electrical Machines and Systems (ICEMS), Hamamatsu, Japan

With the ambitious targeted emissions reduction, the aircraft industry is moving towards drastically different aircraft architectures including hybrid-electric. These in turn require electrical machines with a step change improvement in power-density... Read More about Comparison of slotted and slotless PM machines for high kW/kg aerospace applications.

AC loss Analysis in Winding of Electrical Machines with varying Strands-in-hand and Bundle Shapes (2020)
Presentation / Conference Contribution
Bardalai, A., Gerada, D., Xu, Z., & Gerada, C. (2020, November). AC loss Analysis in Winding of Electrical Machines with varying Strands-in-hand and Bundle Shapes. Presented at 2020 23rd International Conference on Electrical Machines and Systems (ICEMS), Hamamatsu, Japan

This paper presents an investigation into the sensitivity of high-frequency AC effects on the winding with varying number of parallel strands. Based on numerical analysis, a methodology to segregate the losses into components is presented. It is show... Read More about AC loss Analysis in Winding of Electrical Machines with varying Strands-in-hand and Bundle Shapes.

Estimation of Oil Spray Cooling Heat Transfer Coefficients on Hairpin Windings With Reduced-Parameter Models (2020)
Journal Article
Liu, C., Gerada, D., Xu, Z., Chong, Y. C., Michon, M., Goss, J., Li, J., Gerada, C., & Zhang, H. (2021). Estimation of Oil Spray Cooling Heat Transfer Coefficients on Hairpin Windings With Reduced-Parameter Models. IEEE Transactions on Transportation Electrification, 7(2), 793-803. https://doi.org/10.1109/tte.2020.3031373

Hairpin windings and spray cooling are becoming an increasingly popular combination in the field of high-performance electrical machine design. Machines adopting hairpin windings can achieve higher torque and power densities while enabling them to be... Read More about Estimation of Oil Spray Cooling Heat Transfer Coefficients on Hairpin Windings With Reduced-Parameter Models.

Analysis of a Five-Phase PM Vernier Machine Topology with Two-Slot Pitch Winding (2020)
Presentation / Conference Contribution
Zhu, S., Cox, T., Xu, Z., & Gerada, C. (2020, October). Analysis of a Five-Phase PM Vernier Machine Topology with Two-Slot Pitch Winding. Presented at 2020 IEEE Energy Conversion Congress and Exposition (ECCE), Detroit, MI, USA

This paper presents a five-phase permanent magnet (PM) vernier machine topology equipped with a two-slot pitch winding. The two-slot pitch winding provides a trade-off between fractional slots concentrated winding (FSCW) and integrated slot distribut... Read More about Analysis of a Five-Phase PM Vernier Machine Topology with Two-Slot Pitch Winding.

Optimized Magnet wire size and Slot winding height for minimum AC losses in a Traction Machine (2020)
Presentation / Conference Contribution
Bardalai, A., Gerada, D., Xu, Z., & Gerada, C. (2020, August). Optimized Magnet wire size and Slot winding height for minimum AC losses in a Traction Machine. Presented at 2020 International Conference on Electrical Machines (ICEM), Gothenburg

The demand for high performance electrical machines that combine high power density (kW/kg or kW/L), light – weighting and high efficiency have become more and more important in recent years. In these machines, mitigation of the parasitic losses asso... Read More about Optimized Magnet wire size and Slot winding height for minimum AC losses in a Traction Machine.

Slot Number Thermal Effects on Electrical Machines (2020)
Journal Article
ZHANG, F., Gerada, D., Xu, Z., Zhang, X., Tighe, C., Zhang, H., Hua, W., & Gerada, C. (2021). Slot Number Thermal Effects on Electrical Machines. IEEE Transactions on Energy Conversion, 36(1), 23-35. https://doi.org/10.1109/tec.2020.3008219

Experimental study of thermal fracturing of Hot Dry Rock irradiated by moving laser beam: Temperature, efficiency and porosity (2020)
Journal Article
Wang, Y., Jiang, J., Darkwa, J., Xu, Z., Zheng, X., & Zhou, G. (2020). Experimental study of thermal fracturing of Hot Dry Rock irradiated by moving laser beam: Temperature, efficiency and porosity. Renewable Energy, 160, 803-816. https://doi.org/10.1016/j.renene.2020.06.138

A new laser irradiation fracturing method is employed to crack the Hot Dry Rock (HDR) and variations of rock temperature, specific energy (SE) and modified specific energy (MSE), thermal damages and open porosity of granite samples caused by moving l... Read More about Experimental study of thermal fracturing of Hot Dry Rock irradiated by moving laser beam: Temperature, efficiency and porosity.

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.

Thermal Model Approach to Multisector Three-Phase Electrical Machines (2020)
Journal Article
Zhang, H., Giangrande, P., Sala, G., Xu, Z., Hua, W., Madonna, V., Gerada, D., & Gerada, C. (2021). Thermal Model Approach to Multisector Three-Phase Electrical Machines. IEEE Transactions on Industrial Electronics, 68(4), 2919-2930. https://doi.org/10.1109/TIE.2020.2977559

© 1982-2012 IEEE. Multisector machines reveal a high fault-tolerant capability, since failure events can be isolated by de-energizing the faulty sector, while the healthy ones contribute in delivering the required power. This article is focused on th... Read More about Thermal Model Approach to Multisector Three-Phase Electrical Machines.

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, August). Sensitivity Analysis of Machine Components Thermal Properties Effects on Winding Temperature. Presented at 2019 22nd International Conference on Electrical Machines and Systems (ICEMS), Harbin, China

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.

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., Zhang, H., & 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.

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, August). Equivalent Slot Thermal Conductivity and Back-iron Extension Effects on Machine Cooling. Presented at 2019 22nd International Conference on Electrical Machines and Systems (ICEMS), Harbin, China

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)
Presentation / Conference Contribution
Golovanov, D., Xu, Z., Gerada, D., Page, A., Gerada, C., & Sawata, T. (2019, August). Designing an Advanced Electrical Motor for Propulsion of Electric Aircraft. Presented at AIAA Propulsion and Energy Forum and Exposition, 2019, Indianapolis, IN

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.

Dual-Rotor Permanent Magnet Motor for Electric Superbike (2019)
Presentation / Conference Contribution
Golovanov, D., Galassini, A., Flanagan, L., Gerada, D., Xu, Z., & Gerada, C. (2019, May). Dual-Rotor Permanent Magnet Motor for Electric Superbike. Presented at 2019 IEEE International Electric Machines & Drives Conference (IEMDC), San Diego, CA, USA

The demand on high-performance electrical machines has significantly increased for aerospace and transportation industries in recent years. A racing electric motorbike is a suitable platform to validate and prove new concepts and machine topologies b... Read More about Dual-Rotor Permanent Magnet Motor for Electric Superbike.

Thermo-Mechanical Modelling of Bearing Chambers of a High-Speed Starter/Generator (2019)
Presentation / Conference Contribution
Rocca, A. L., Connor, P. H., Xu, Z., Eastwick, C. N., Pickering, S. J., & Gerada, C. (2019, May). Thermo-Mechanical Modelling of Bearing Chambers of a High-Speed Starter/Generator. Presented at 2019 IEEE International Electric Machines & Drives Conference (IEMDC), San Diego, CA, USA

This paper describes the thermal-mechanical characterisation methodology for the bearing chambers of a high-speed (32,000 rpm) electrical starter/generator [1]; presenting a low cost analysis approach and design guideline for future machines. The met... Read More about Thermo-Mechanical Modelling of Bearing Chambers of a High-Speed Starter/Generator.

Air-Cooling of a Hollow High-Speed Permanent Magnet Rotor (2019)
Presentation / Conference Contribution
Connor, P. H., La Rocca, A., Xu, Z., Degano, M., Eastwick, C. N., Pickering, S. J., & Gerada, C. (2019, May). Air-Cooling of a Hollow High-Speed Permanent Magnet Rotor. Presented at 2019 IEEE International Electric Machines and Drives Conference, IEMDC 2019, San Diego, USA

This paper presents a computational fluid dynamics conjugate heat transfer analysis of internal and external cooling paths for a hollow high-speed permanent magnet rotor. Extracting magnet losses from high-speed permanent magnet rotors is challenging... Read More about Air-Cooling of a Hollow High-Speed Permanent Magnet Rotor.

Eddy Current Loss Control in High Speed PM Starter-Generator (2019)
Presentation / Conference Contribution
Zhang, X., Zhang, H., Gerada, C., Gerada, D., Li, J., Xu, Z., & Liu, C. (2019, April). Eddy Current Loss Control in High Speed PM Starter-Generator. Presented at 2019 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD), Athens, Greece

This paper highlights the advancement in high speed generation applications along with describing the state of the art in the machine design technologies enabling such an application uptake. Via the investigating on a 250kW high speed PM starter-gene... Read More about Eddy Current Loss Control in High Speed PM Starter-Generator.

Effective Thermal Conductivity Calculation and Measurement of Litz Wire based on the Porous Metal Materials Structure (2019)
Journal Article
Liu, X., Gerada, D., Xu, Z., Corfield, M., Gerada, C., & Yu, H. (2020). Effective Thermal Conductivity Calculation and Measurement of Litz Wire based on the Porous Metal Materials Structure. IEEE Transactions on Industrial Electronics, 67(4), 2667-2677. https://doi.org/10.1109/tie.2019.2910031

Litz wires are employed in high-frequency electrical machines due to their advantages of reducing the ac losses, including minimizing the skin effect and the proximity effect. In order to improve the reliability of such machines, and enable accurate... Read More about Effective Thermal Conductivity Calculation and Measurement of Litz Wire based on the Porous Metal Materials Structure.

Numerical investigations of convective phenomena of oil impingement on end-windings (2019)
Presentation / Conference Contribution
Connor, P. H., La Rocca, A., Xu, Z., Eastwick, C. N., Pickering, S. J., & Gerada, C. (2018, April). Numerical investigations of convective phenomena of oil impingement on end-windings. Presented at 9th International Conference on Power Electronics, Machines and Drives (PEMD 2018), Liverpool

A novel experimental rig for analysing intensive liquid cooling of highly power-dense electrical machine components has been developed. Coupled fluid flow and heat transfer have been modelled, using computational fluid dynamics (CFD), to inform the d... Read More about Numerical investigations of convective phenomena of oil impingement on end-windings.