Professor CHRISTOPHER GERADA's Outputs (189)

Sensitivity analysis for performance and power density improvements in salient-pole synchronous generators (2017)
Presentation / Conference Contribution
Wang, Y., Vakil, G., Nuzzo, S., Degano, M., Galea, M., Gerada, C., Zhang, H., & Brown, N. (2017, April). Sensitivity analysis for performance and power density improvements in salient-pole synchronous generators. Presented at IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD) 2017, Nottingham, UK

Objective of this paper is to provide design recommendations to improve the performance and power density of a 400kVA salient-pole synchronous generator, without exceeding the limitations due to critical parameters such as total harmonic distortion o... Read More about Sensitivity analysis for performance and power density improvements in salient-pole synchronous generators.

Design optimization of a short-term duty electrical machine for extreme environment (2017)
Journal Article
Arumugam, P., Amankwah, E. K., Walker, A., & Gerada, C. (2017). Design optimization of a short-term duty electrical machine for extreme environment. IEEE Transactions on Industrial Electronics, 64(12), 9784-9794. https://doi.org/10.1109/TIE.2017.2711555

This paper presents design optimisation of a short term duty electrical machine for extreme environments of high temperature and high altitudes. For such extreme environmental conditions of above 80⁰C and altitudes of 30km, thermal loading limits are... Read More about Design optimization of a short-term duty electrical machine for extreme environment.

A fractional slot multiphase air-core compulsator with concentrated winding (2017)
Journal Article
Zhao, W., Wu, S., Cui, S., Gerada, C., Zhang, H., & Xu, Z. (2017). A fractional slot multiphase air-core compulsator with concentrated winding. IEEE Transactions on Plasma Science, 45(7), 1387-1393. https://doi.org/10.1109/TPS.2017.2705243

Compulsator is a specially designed generator capa¬ble of delivering high current pulses to a low-impedance load, such as the electromagnetic railgun. In order to increase the tip speed of the rotor, advanced composite materials have been used in the... Read More about A fractional slot multiphase air-core compulsator with concentrated winding.

A hybrid analytical-numerical approach for the analysis of salient-pole synchronous generators with a symmetrical damper cage (2017)
Presentation / Conference Contribution
Nuzzo, S., Bolognesi, P., Galea, M., & Gerada, C. A hybrid analytical-numerical approach for the analysis of salient-pole synchronous generators with a symmetrical damper cage. Presented at IEEE International Electric Machines and Drives Conference (IEMDC 2017)

The equivalent circuit approach has been widely exploited for the theoretical analysis of electromagnetic devices. However, in the field of classical wound-field synchronous generators, the presence of the damper cage complicates the analysis of such... Read More about A hybrid analytical-numerical approach for the analysis of salient-pole synchronous generators with a symmetrical damper cage.

Design optimization of integrated rotational inductor for high-speed AC drive applications (2017)
Presentation / Conference Contribution
Khowja, M. R., Gerada, C., Vakil, G., Patel, C., & Wheeler, P. Design optimization of integrated rotational inductor for high-speed AC drive applications. Presented at IEEE International Electric Machines and Drives Conference

In order to make an efficient and power dense overall system, a close physical and functional integration of passive components is required instead of having a separate sub¬system for passives. Such power dense system is vital in aerospace and marine... Read More about Design optimization of integrated rotational inductor for high-speed AC drive applications.

Realising robust low speed sensorless PMSM control using current derivatives obtained from standard current sensors (2017)
Presentation / Conference Contribution
Hind, D., Li, C., Sumner, M., & Gerada, C. Realising robust low speed sensorless PMSM control using current derivatives obtained from standard current sensors. Presented at 2017 IEEE International Electric Machines and Drives Conference (IEMDC)

This paper describes the implementation of a simple, robust and cost-effective sensorless control technique for PMSM machines. The method uses stator current derivative measurements made in response to certain PWM vectors. In this work the derivative... Read More about Realising robust low speed sensorless PMSM control using current derivatives obtained from standard current sensors.

Self-excitation and energy recovery of air-core compulsators (2017)
Journal Article
Zhao, W., Wu, S., Cui, S., Gerada, C., Zhang, H., & Xu, Z. (2017). Self-excitation and energy recovery of air-core compulsators. IEEE Transactions on Plasma Science, 45(7), 1168-1174. https://doi.org/10.1109/TPS.2017.2700027

As power supplies, compulsators are popular choices for high-end railgun power supplies. In order to increase power and energy density, air-core compulsators are proposed by using composite materials instead of traditional iron-core compulsators. Due... Read More about Self-excitation and energy recovery of air-core compulsators.

Design and control of segmented triple three-phase SPM machines for fault tolerant drives (2017)
Presentation / Conference Contribution
Sala, G., Gerada, D., Gerada, C., & Tani, A. Design and control of segmented triple three-phase SPM machines for fault tolerant drives. Presented at 2017 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD 2017)

A new multiphase Surface Permanent Magnet (SPM) machine design is investigated in this paper. The machine has a nine-phase winding arranged in three sectors and supplied by three different Voltage Source Inverters (VSI). Stator segmentation between t... Read More about Design and control of segmented triple three-phase SPM machines for fault tolerant drives.

Radial force control for triple three-phase sectored SPM machines. Part I: Machine model (2017)
Presentation / Conference Contribution
Sala, G., Gerada, D., Gerada, C., & Tani, A. Radial force control for triple three-phase sectored SPM machines. Part I: Machine model. Presented at 2017 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD 2017)

The radial force control technique for a triple three-phase Surface Permanent Magnet (SPM) machine is investigated in this paper. The machine has a nine-phase winding arranged in three sectors and supplied by three different Voltage Source Inverters... Read More about Radial force control for triple three-phase sectored SPM machines. Part I: Machine model.

Radial force control for triple three-phase sectored SPM machines. Part II: Open winding fault tolerant control (2017)
Presentation / Conference Contribution
Sala, G., Gerada, D., Gerada, C., & Tani, A. Radial force control for triple three-phase sectored SPM machines. Part II: Open winding fault tolerant control. Presented at 2017 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD 2017)

A new advanced fault tolerant control technique for a triple three-phase Surface Permanent Magnet (SPM) machine is investigated in this paper. The machine has a nine-phase winding arranged in three sectors and supplied by three different Voltage Sour... Read More about Radial force control for triple three-phase sectored SPM machines. Part II: Open winding fault tolerant control.

A fast method for modelling skew and its effects in salient-pole synchronous generators (2017)
Journal Article
Nuzzo, S., Galea, M., Gerada, C., & Brown, N. (in press). A fast method for modelling skew and its effects in salient-pole synchronous generators. IEEE Transactions on Industrial Electronics, 64(10), https://doi.org/10.1109/TIE.2017.2694378

The general effects of implementing skewing techniques in electrical machines are well known and have been extensively studied over the years. An important aspect of such techniques is related to the identification of optimal methods for analyzing an... Read More about A fast method for modelling skew and its effects in salient-pole synchronous generators.

Analytical thermal model for fast stator winding temperature prediction (2017)
Journal Article
Sciascera, C., Giangrande, P., Papini, L., Gerada, C., & Galea, M. (2017). Analytical thermal model for fast stator winding temperature prediction. IEEE Transactions on Industrial Electronics, 64(8), 6116-6126. https://doi.org/10.1109/TIE.2017.2682010

This paper introduces an innovative thermal modelling technique which accurately predicts the winding temperature of electrical machines, both at transient and steady state conditions, for applications where the stator Joule losses are the dominant h... Read More about Analytical thermal model for fast stator winding temperature prediction.

High specific torque motor for propulsion system of aircraft (2017)
Presentation / Conference Contribution
Golovanov, D., Galea, M., & Gerada, C. (2018, November). High specific torque motor for propulsion system of aircraft. Presented at International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC 2016), Toulouse, France

This paper proposes an analytical model that considers the torque characteristics for high specific torque synchronous machine with outer rotor and a Halbach permanent magnet array. The distribution of the magnetic field in the air gap is obtained wi... Read More about High specific torque motor for propulsion system of aircraft.

CQICO and multiobjective thermal optimization for high-speed PM generator (2017)
Journal Article
Zhang, X., Li, W., Gerada, C., Zhang, H., Li, J., Galea, M., Gerada, D., & Cao, J. (2017). CQICO and multiobjective thermal optimization for high-speed PM generator. IEEE Transactions on Magnetics, 53(6), https://doi.org/10.1109/TMAG.2017.2658187

This paper proposes a novel Continuous Quantum Immune Clonal Optimization (CQICO) algorithm for thermal optimization on an 117kW high speed permanent magnet generator (HSPMG). The proposed algorithm mixes the Quantum Computation into the Immune Cloni... Read More about CQICO and multiobjective thermal optimization for high-speed PM generator.

Axial position estimation of conical shaped motor for green taxiing application (2016)
Presentation / Conference Contribution
Roggia, S., Galea, M., Gerada, C., & Cupertino, F. (2016, September). Axial position estimation of conical shaped motor for green taxiing application. Presented at IEEE Energy Conversion Congress and Exposition (ECCE), Milwaukee, WI, USA

This paper considers the possibility of adopting a conical shaped motor for Green Taxiing (GT) application. This topology of motor has been selected in order to obviate the presence of external declutching system (i.e. mechanical or electromagnetic c... Read More about Axial position estimation of conical shaped motor for green taxiing application.

Active Magnetic Bearing system design featuring a predictive current control (2016)
Presentation / Conference Contribution
Papini, L., Tarisciotti, L., Costabeber, A., Gerada, C., & Wheeler, P. (2016, October). Active Magnetic Bearing system design featuring a predictive current control. Presented at 42nd Annual Conference of IEEE Industrial Electronics Society, Florence, Italy

Active Magnetic Bearing (AMB) technology is becoming attractive for several reasons such as high speed operations, high reliability and vibrations exemption. Moreover, AMB can behave as active vibration dampers and provide a real-time control of the... Read More about Active Magnetic Bearing system design featuring a predictive current control.

History and recent advancements of electric propulsion and integrated electrical power systems for commercial & naval vessels (2016)
Presentation / Conference Contribution
Yang, T., Cox, T., Degano, M., Bozhko, S., & Gerada, C. History and recent advancements of electric propulsion and integrated electrical power systems for commercial & naval vessels. Presented at International Naval & Maritime Exhibition and Congress for Latin America, ExpoNAVAL 2016

Due to developments in power electronics, electric machines, energy storage and control, electric propulsion and integrated electrical power systems have become major trends for commercial and naval vessels. This is mainly due to the fact that the us... Read More about History and recent advancements of electric propulsion and integrated electrical power systems for commercial & naval vessels.

Multistress characterization of fault mechanisms in aerospace electric actuators (2016)
Journal Article
Barater, D., Immovilli, F., Soldati, A., Buticchi, G., Franceschini, G., Gerada, C., & Galea, M. (in press). Multistress characterization of fault mechanisms in aerospace electric actuators. IEEE Transactions on Industry Applications, 53(2), https://doi.org/10.1109/TIA.2016.2633948

The concept behind the More Electric Aircraft (MEA) is the progressive electrification of on-board actuators and services. It is a way to reduce or eliminate the dependence on hydraulic, mechanical and the bleed air/pneumatic systems and pursue effic... Read More about Multistress characterization of fault mechanisms in aerospace electric actuators.

Lifetime consumption and degradation analysis of the winding insulation of electrical machines (2016)
Presentation / Conference Contribution
Sciascera, C., Galea, M., Giangrande, P., & Gerada, C. Lifetime consumption and degradation analysis of the winding insulation of electrical machines. Presented at 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

In this paper, a novel multi-stress model which estimates the lifetime of the winding insulation relative to its duty cycle is proposed and investigated. With an adequate implementation of this model, then an electrical machine can be designed not on... Read More about Lifetime consumption and degradation analysis of the winding insulation of electrical machines.

Assessment of cooling methods for increased power density in electrical machines (2016)
Presentation / Conference Contribution
Tighe, C., Gerada, C., & Pickering, S. Assessment of cooling methods for increased power density in electrical machines. Presented at XXIIth International Conference on Electrical Machines (ICEM'2016)

A comprehensive thermal analysis of three different electrical machines is presented, with a view of identifying design aspects that can be exploited to achieve higher power density. A review of some novel cooling methods is initially made. Following... Read More about Assessment of cooling methods for increased power density in electrical machines.