All Outputs (139)

Parameter study for oil spray cooling on endwindings of electric machines via Eulerian–Lagrangian simulation (2023)
Journal Article
Zhao, A., Duwig, C., Liu, C., Gerada, D., & Leksell, M. (2023). Parameter study for oil spray cooling on endwindings of electric machines via Eulerian–Lagrangian simulation. Applied Thermal Engineering, 235, Article 121281. https://doi.org/10.1016/j.applthermaleng.2023.121281

The demand for larger power density and torque for the power traction motors used in electrified transportation puts forward a requirement for better thermal management methods. Spray cooling is a promising direct liquid cooling technique that has be... Read More about Parameter study for oil spray cooling on endwindings of electric machines via Eulerian–Lagrangian simulation.

Effectiveness of Thermal Interface Materials on Electrical Machines Thermal Performance with Heat Pipes (2023)
Journal Article
Zhao, H., Zhang, X., Li, J., Zhang, F., Zhao, W., Zhang, Y., Gerada, D., & Zhang, H. (2024). Effectiveness of Thermal Interface Materials on Electrical Machines Thermal Performance with Heat Pipes. IEEE Transactions on Transportation Electrification, 10(1), 1274-1285. https://doi.org/10.1109/TTE.2023.3274554

Thermal issue has always been a major concern in motor design. Heat pipes (HPs) have been applied in electrical machines with remarkable cooling effects reported. However, critical factors that affect HP thermal benefits have rarely been studied, suc... Read More about Effectiveness of Thermal Interface Materials on Electrical Machines Thermal Performance with Heat Pipes.

Analytical Calculation and Experimental Validation of Litz Wires Axial Thermal Conductivity (2023)
Journal Article
Li, Z., Xu, Z., Zhang, F., Gerada, D., Guo, R., Zhang, H., Corfield, M., Gerada, C., & Zhang, C. (2024). Analytical Calculation and Experimental Validation of Litz Wires Axial Thermal Conductivity. IEEE Transactions on Transportation Electrification, 10(1), 1167-1179. https://doi.org/10.1109/TTE.2023.3262766

Litz wires are widely used in electrical machines with reduced AC losses, compared to traditional random winding. The reduced AC losses can improve both electrical machines electromagnetic performance, such as efficiency and thermal performance. Ther... Read More about Analytical Calculation and Experimental Validation of Litz Wires Axial Thermal Conductivity.

Heat Pipe Bending Effect on Cooling Effectiveness in Electrical Machines (2023)
Journal Article
Zhao, H., Zhang, X., Li, J., Wang, H., Zhang, F., Zhang, H., Zhu, X., & Gerada, D. (2023). Heat Pipe Bending Effect on Cooling Effectiveness in Electrical Machines. IEEE Transactions on Energy Conversion, 38(3), 2011-2021. https://doi.org/10.1109/tec.2023.3249971

Heat pipes(HPs) are being extensively explored in motor cooling scenarios for enhanced cooling capacity. HPs are commonly bent to adapt to the compact structure of electrical machines, whereas the bending effect on motor cooling effectiveness still r... Read More about Heat Pipe Bending Effect on Cooling Effectiveness in Electrical Machines.

Experimental Investigation of Heat Pipe Inclination Angle Effect on Temperature Nonuniformity in Electrical Machines (2022)
Journal Article
Zhang, X., Zhao, H., Li, J., Zhang, F., Zhang, Y., Yan, H., Niu, Z., Gerada, D., & Zhang, H. (2023). Experimental Investigation of Heat Pipe Inclination Angle Effect on Temperature Nonuniformity in Electrical Machines. Energies, 16(1), Article 350. https://doi.org/10.3390/en16010350

Heat pipes (HPs) are gaining increasing popularity in the propulsion motors of transportation electrification due to their remarkable thermal properties. However, the inclination angle affects the HP thermal performance and, thus, results in temperat... Read More about Experimental Investigation of Heat Pipe Inclination Angle Effect on Temperature Nonuniformity in Electrical Machines.

Analysis of Stator Vibration Characteristics in Synchronous Generators Considering Inclined Static Air Gap Eccentricity (2022)
Journal Article
He, Y. L., Li, Y., Zhang, W., Xu, M. X., Bai, Y. F., Wang, X. L., Shi, S. Z., & Gerada, D. (2023). Analysis of Stator Vibration Characteristics in Synchronous Generators Considering Inclined Static Air Gap Eccentricity. IEEE Access, 2023(11), 7794-7807. https://doi.org/10.1109/ACCESS.2022.3230907

This paper mainly focuses on the impact of inclined static air gap eccentricity (ISAGE) on the electromagnetic characteristics and mechanical performances (vibration, deformation, strain and stress). Considering different ISAGE fault types in the the... Read More about Analysis of Stator Vibration Characteristics in Synchronous Generators Considering Inclined Static Air Gap Eccentricity.

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.

Impact of stator interturn short circuit fault on shaft voltage in a synchronous generator (2022)
Journal Article
He, Y., Yang, P., Sun, K., Xu, Z., Wang, H., He, X., & Gerada, D. (2023). Impact of stator interturn short circuit fault on shaft voltage in a synchronous generator. IET Electric Power Applications, 17(3), 381-391. https://doi.org/10.1049/elp2.12271

Shaft voltage often exists in synchronous generators due to the assembly error or various faults after the long‐term performance. The article investigates the shaft voltage characteristic under the stator interturn short circuit (SISC) condition. Dif... Read More about Impact of stator interturn short circuit fault on shaft voltage in a synchronous generator.

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.

Stator current identification in generator among single and composite faults composed by static air‐gap eccentricity and rotor inter‐turn short circuit (2022)
Journal Article
He, Y., Qiu, M., Jiang, M., Zhou, F., Gerada, D., Zhang, X., & Du, X. (2023). Stator current identification in generator among single and composite faults composed by static air‐gap eccentricity and rotor inter‐turn short circuit. IET Electric Power Applications, 17(2), 268-278. https://doi.org/10.1049/elp2.12260

In this study, a fault diagnosis model based on magnetic density is proposed to analyse the current characteristics of synchronous generator rotor inter‐turn short circuit and air gap eccentric single fault and composite fault. The model considers th... Read More about Stator current identification in generator among single and composite faults composed by static air‐gap eccentricity and rotor inter‐turn short circuit.

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.

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.

A Comprehensive Review and Experimental Investigation on Heat Pipes Application in Electrical Machines (2022)
Journal Article
Zhao, H., Zhang, X., Zhang, F., Wang, S., Zhao, W., Li, J., Zhang, H., & Gerada, D. (2023). A Comprehensive Review and Experimental Investigation on Heat Pipes Application in Electrical Machines. IEEE Transactions on Transportation Electrification, 9(2), 2267-2281. https://doi.org/10.1109/TTE.2022.3207504

The rapid development of transportation electrification brings unprecedented opportunities and challenges as well to the technological improvement of high-power-density motors. As the major restriction of motor performance, thermal issues attract mor... Read More about A Comprehensive Review and Experimental Investigation on Heat Pipes Application in Electrical Machines.

Fast Sizing Tool and Optimization Technique for Concentrated Wound Slotless Outer Rotor Motor for eVTOL Application (2022)
Presentation / Conference Contribution
Dave, N., Gerada, D., Vakil, G., Zhang, H., Shi, B., Zhang, F., Li, J., & Gerada, C. (2022, September). Fast Sizing Tool and Optimization Technique for Concentrated Wound Slotless Outer Rotor Motor for eVTOL Application. Presented at 2022 International Conference on Electrical Machines (ICEM), Valencia, Spain

This paper aims to present the feasibility and advantages of slotless motors for electric aircraft applications. Currently, eVTOL (electric vertical takeoff and landing) aircraft are equipped with a slotted motor with concentrated windings and an out... Read More about Fast Sizing Tool and Optimization Technique for Concentrated Wound Slotless Outer Rotor Motor for eVTOL Application.

Power Loss and Performance Analysis of a Permanent Magnet Synchronous Motor for Actuator Applications (2022)
Presentation / Conference Contribution
Tameemi, A., Degano, M., Di Nardo, M., Murataliyev, M., Gerada, D., Xu, Z., & Gerada, C. (2022, September). Power Loss and Performance Analysis of a Permanent Magnet Synchronous Motor for Actuator Applications. Presented at 2022 International Conference on Electrical Machines (ICEM), Valencia, Spain

Permanent magnet synchronous motors are very suitable in applications demanding high power density with high performance requirements, such as in aerospace actuators. Achieving high performance targets while keeping the total weight of the electrical... Read More about Power Loss and Performance Analysis of a Permanent Magnet Synchronous Motor for Actuator Applications.

Impact of Radial Air-Gap Eccentricity on Stator End Winding Vibration Characteristics in DFIG (2022)
Journal Article
Xu, M.-X., He, Y.-L., Zhang, W., Dai, D.-R., Liu, X.-A., Zheng, W.-J., Wan, S.-T., Gerada, D., & Shi, S.-Z. (2022). Impact of Radial Air-Gap Eccentricity on Stator End Winding Vibration Characteristics in DFIG. Energies, 15(17), Article 6426. https://doi.org/10.3390/en15176426

In this paper, qualitative theoretical derivations, finite element analysis (FEA) and experiments are used to investigate the electromagnetic force (EF) and vibration characteristics of end windings. In contrast to previous studies, this study focuse... Read More about Impact of Radial Air-Gap Eccentricity on Stator End Winding Vibration Characteristics in DFIG.

Modifications to PM-assisted Synchronous Reluctance Machine to Achieve Rare-Earth Free Heavy-duty Traction (2022)
Journal Article
Al-ani, M., Walker, A., Vakil, G., Gerada, D., Gerada, C., & Paciura, K. (2023). Modifications to PM-assisted Synchronous Reluctance Machine to Achieve Rare-Earth Free Heavy-duty Traction. IEEE Journal of Emerging and Selected Topics in Power Electronics, 11(2), 2029 -2038. https://doi.org/10.1109/jestpe.2022.3203184

Automotive applications require electrical machines designed for high torque density, wide speed range, and low cost. NdFeB magnets can achieve a high torque density and wide speed range, and however, they have a high cost. Therefore, this article ex... Read More about Modifications to PM-assisted Synchronous Reluctance Machine to Achieve Rare-Earth Free Heavy-duty Traction.