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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., …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.

How non-conventional machining affects the surface integrity and magnetic properties of non-oriented electrical steel (2021)
Journal Article
Winter, K., Liao, Z., Ramanathan, R., Axinte, D., Vakil, G., & Gerada, C. (2021). How non-conventional machining affects the surface integrity and magnetic properties of non-oriented electrical steel. Materials and Design, 210, Article 110051. https://doi.org/10.1016/j.matdes.2021.110051

Non-oriented electrical steel (NOES) laminations are commonly used to manufacture the rotor and stator core of electric machines. To achieve high machine efficiencies, it is desirable for these NOES laminations to be able to achieve a high saturation... Read More about How non-conventional machining affects the surface integrity and magnetic properties of non-oriented electrical steel.

On Torque Improvement by Current Harmonic Injection in Isotropic and Anisotropic Multiphase Machines (2021)
Journal Article
De Gaetano, D. D., Harikumaran, J., Sala, G., Degano, M., Buticchi, G., & Gerada, C. (2022). On Torque Improvement by Current Harmonic Injection in Isotropic and Anisotropic Multiphase Machines. IEEE Journal of Emerging and Selected Topics in Industrial Electronics, 3(3), 845-853. https://doi.org/10.1109/JESTIE.2021.3105337

Multiphase machines give the possibility to increase the torque injecting and controlling current harmonics of different orders. This work investigates the current harmonic injection techniques for both isotropic and anisotropic machines. The propose... Read More about On Torque Improvement by Current Harmonic Injection in Isotropic and Anisotropic Multiphase Machines.

A Scalable System Architecture for High-Performance Fault Tolerant Machine Drives (2021)
Journal Article
Savi, F., Barater, D., Buticchi, G., Gerada, C., & Wheeler, P. (2021). A Scalable System Architecture for High-Performance Fault Tolerant Machine Drives. IEEE Open Journal of the Industrial Electronics Society, 2, 428-440. https://doi.org/10.1109/ojies.2021.3104977

When targeting mission critical applications, the design of the electronic actuation systems needs to consider many requirements and constraints not typical in standard industrial applications. One of these is tolerance to faults, as the unplanned sh... Read More about A Scalable System Architecture for High-Performance Fault Tolerant Machine Drives.

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.

Integrated motor drive: Mass and volume optimization of the motor with an integrated filter inductor (2021)
Journal Article
Khowja, M. R., Vakil, G., Gerada, C., Patel, C., Odhano, S., & Wheeler, P. (2021). Integrated motor drive: Mass and volume optimization of the motor with an integrated filter inductor. Energies, 14(15), Article 4564. https://doi.org/10.3390/en14154564

The present trend of aerospace industries is being shifted towards a “More Electric Aircraft” system which needs to be high power dense. For this purpose, the integration technologies have gained massive interest, providing the benefits of reduced lo... Read More about Integrated motor drive: Mass and volume optimization of the motor with an integrated filter inductor.

Open and Short Circuit Post-Fault Control Strategies for Multi-Three-Phase Interior Permanent Magnet Machines (2021)
Journal Article
Abdul Rahman, A., Galassini, A., Degano, M., Buticchi, G., Cristian Pesce, G., Gerada, C., Bozhko, S., & Almurib, H. A. (2022). Open and Short Circuit Post-Fault Control Strategies for Multi-Three-Phase Interior Permanent Magnet Machines. IEEE Transactions on Energy Conversion, 37(1), 163-174. https://doi.org/10.1109/tec.2021.3090982

This paper presents a post-fault current control strategy for dual three-phase Interior Permanent Magnet (IPM) synchronous machines. The current controllers are designed based on the Vector Space Decomposition (VSD) algorithm. This take into account... Read More about Open and Short Circuit Post-Fault Control Strategies for Multi-Three-Phase Interior Permanent Magnet Machines.

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.

A thermal modeling approach and experimental validation for an oil spray-cooled hairpin winding machine (2021)
Journal Article
Zhang, F., Gerada, D., Xu, Z., Liu, C., Zhang, H., Zou, T., Chong, Y. C., & Gerada, C. (2021). A thermal modeling approach and experimental validation for an oil spray-cooled hairpin winding machine. IEEE Transactions on Transportation Electrification, 7(4), 2914--2926. https://doi.org/10.1109/tte.2021.3067601

While the electromagnetic aspects of hairpin windings are actively being investigated and discussed in recent literature, including the design rules together with the loss calculation and reduction techniques, the thermal performance and modeling asp... Read More about A thermal modeling approach and experimental validation for an oil spray-cooled hairpin winding machine.

Enhanced Active Disturbance Rejection Current Controller for Permanent Magnet Synchronous Machines Operated at Low Sampling Time Ratio (2021)
Journal Article
Diab, A. M., Yeoh, S. S., Bozhko, S., Gerada, C., & Galea, M. (2022). Enhanced Active Disturbance Rejection Current Controller for Permanent Magnet Synchronous Machines Operated at Low Sampling Time Ratio. IEEE Journal of Emerging and Selected Topics in Industrial Electronics, 3, 230-241. https://doi.org/10.1109/JESTIE.2021.3063919

Recently, Active Disturbance Rejection Control (ADRC) Scheme has been widely used for current regulation in AC drive systems owing to its robustness to system uncertainties and its high disturbance-rejection capability. However, it has not been consi... Read More about Enhanced Active Disturbance Rejection Current Controller for Permanent Magnet Synchronous Machines Operated at Low Sampling Time Ratio.

Active Thermal Control for Modular Power Converters in Multi-Phase Permanent Magnet Synchronous Motor Drive System (2021)
Journal Article
Yan, H., Zhao, W., Buticchi, G., & Gerada, C. (2021). Active Thermal Control for Modular Power Converters in Multi-Phase Permanent Magnet Synchronous Motor Drive System. IEEE Access, 9, 7054-7063. https://doi.org/10.1109/access.2021.3049293

Modular winding structure has been employed in the Permanent Magnet SynchronousMotors (PMSMs) to increase the reliability and reduce the torque ripple. Nevertheless, the reliability ofthe motor system depends on the lifetime of the power semiconducto... Read More about Active Thermal Control for Modular Power Converters in Multi-Phase Permanent Magnet Synchronous Motor Drive System.

Optimization and Analysis of a High Power Density and Fault Tolerant Starter–Generator for Aircraft Application (2020)
Journal Article
Wang, B., Vakil, G., Liu, Y., Yang, T., Zhang, Z., & Gerada, C. (2021). Optimization and Analysis of a High Power Density and Fault Tolerant Starter–Generator for Aircraft Application. Energies, 14(1), Article 113. https://doi.org/10.3390/en14010113

Permanent magnet synchronous machines provide many dramatic electromagnetic performances such as high efficiency and high power density, which make them more competitive in aircraft electrification, whereas, designing a permanent magnet starter–gener... Read More about Optimization and Analysis of a High Power Density and Fault Tolerant Starter–Generator for Aircraft Application.

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.

Improved V‐shaped interior permanent magnet rotor topology with inward‐extended bridges for reduced torque ripple (2020)
Journal Article
Gao, P., Sun, X., Gerada, D., Gerada, C., & Wang, X. (2020). Improved V‐shaped interior permanent magnet rotor topology with inward‐extended bridges for reduced torque ripple. IET Electric Power Applications, 14(12), 2404-2411. https://doi.org/10.1049/iet-epa.2019.0850

Interior permanent magnet synchronous machines (IPMSMs) with V-shaped permanent magnet (PM) rotors are widely used as traction motors in electric vehicles because of their high torque density and high efficiency. However, the V-shape IPMSMs have the... Read More about Improved V‐shaped interior permanent magnet rotor topology with inward‐extended bridges for reduced torque ripple.

Impact of Stator Interturn Short Circuit Position on End Winding Vibration in Synchronous Generators (2020)
Journal Article
He, Y.-L., Xu, M.-X., Zhang, W., Wang, X.-L., Lu, P., Gerada, C., & Gerada, D. (2021). Impact of Stator Interturn Short Circuit Position on End Winding Vibration in Synchronous Generators. IEEE Transactions on Energy Conversion, 36(2), 713-724. https://doi.org/10.1109/tec.2020.3021901

This article presents a comprehensive analysis on the end winding vibration characteristics due to different stator inter-turn short circuit (SISC) positions in synchronous generators. Different from other studies, this article not only pays attentio... Read More about Impact of Stator Interturn Short Circuit Position on End Winding Vibration in Synchronous Generators.

Rotor Position Tracking Control for Low Speed Operation of Direct-Drive PMSM Servo System (2020)
Journal Article
Bu, F., Xuan, F., Yang, Z., Gao, Y., Pan, Z., Degano, M., & Gerada, C. (2021). Rotor Position Tracking Control for Low Speed Operation of Direct-Drive PMSM Servo System. IEEE/ASME Transactions on Mechatronics, 26(2), 1129-1139. https://doi.org/10.1109/tmech.2020.3019039

In this paper, a rotor position tracking control (RPTC) strategy is proposed to effectively reduce the speed fluctuation for a direct-drive permanent magnet synchronous motor (DD-PMSM) servo system operating at low speed with different torque disturb... Read More about Rotor Position Tracking Control for Low Speed Operation of Direct-Drive PMSM Servo System.

Rotor Design Optimization of Squirrel Cage Induction Motor - Part I: Problem Statement (2020)
Journal Article
Marfoli, A., Di Nardo, M., Degano, M., Gerada, C., & Chen, W. (2021). Rotor Design Optimization of Squirrel Cage Induction Motor - Part I: Problem Statement. IEEE Transactions on Energy Conversion, 36(2), 1271-1279. https://doi.org/10.1109/tec.2020.3019934

Squirrel cage induction motor is the most widely adopted electrical machine in applications directly fed by the main grid. The analysis, design and optimization of this machine topology has been addressed by a considerable amount of literature over t... Read More about Rotor Design Optimization of Squirrel Cage Induction Motor - Part I: Problem Statement.

A New External Search Coil Based Method to Detect Detailed Static Air-Gap Eccentricity Position in Nonsalient Pole Synchronous Generators (2020)
Journal Article
He, Y.-L., Zhang, Z.-J., Tao, W.-Q., Wang, X.-L., Gerada, D., Gerada, C., & Gao, P. (2021). A New External Search Coil Based Method to Detect Detailed Static Air-Gap Eccentricity Position in Nonsalient Pole Synchronous Generators. IEEE Transactions on Industrial Electronics, 68(8), 7535-7544. https://doi.org/10.1109/tie.2020.3003635

This research investigates the detection of the detailed static air-gap eccentricity position (SAGE) at both the ends of nonsalient pole synchronous generators (SG). Differently from the previous studies, the detection method proposed does not necess... Read More about A New External Search Coil Based Method to Detect Detailed Static Air-Gap Eccentricity Position in Nonsalient Pole Synchronous Generators.

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.