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381 results on '"Degano, Michele"'

4. Fast Flux Maps Computation of Synchronous Reluctance Machines With and Without Permanent Magnets Assistance

Author

Gallicchio, Gianvito, Nardo, Mauro Di, Cupertino, Francesco, Varvolik, Vasyl, Buticchi, Giampaolo, Degano, Michele, and Gerada, Chris

Abstract

This paper proposes a computational efficient and accurate hybrid analytical-finite element (FE) performance prediction methodology for synchronous reluctance (SyR) machines. The hybrid procedure consists in solving the d- and q-axis magnetic equivalent circuits in a non-linear fashion so to consider the saturation effects of both stator and rotor iron parts. The cross-coupling effects are taken into account by adjusting the analytical flux maps with the results obtained FE-simulating few operating points in the d-q current plane. The proposed approach allows to obtain an excellent estimation of the direct and quadrature axis fluxes for a wide range of operating conditions including the overload ones with a negligible computational effort when compared to a full FE analysis. The estimation accuracy has been assessed analysing a wide spectrum of SyR machine geometries featuring different stator slots and flux barriers combinations including a PM-assisted variant. A sensitivity analysis shows the trade-off between estimation accuracy and computational time while leveraging on the discretization of the airgap equivalent magnetic circuit. The proposed fast performance estimation method is finally validated against the experimental measurements carried out on a SyR machine prototype.

Published
2024
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5. Fillet Radius Impact of Rectangular Insulated Wires on PDIV for Turn-to-Turn Insulation of Inverter-Fed Motors

Author

Naderiallaf, Hadi, Degano, Michele, Gerada, Chris, and Gerada, David

Abstract

This contribution elucidates the impact of the fillet radius (FR), a geometric feature of rectangular insulated wires not commonly considered, on the partial discharge inception voltage (PDIV) in low-voltage machine turn-to-turn winding insulation. Initial PDIV tests involve edgewise-insulated wire samples with a reference FR. These measurements are performed under constant conditions: 30 °C temperature, 35% relative humidity (RH), and atmospheric pressure (1000 mbar). These tests are carried out under ac 50-Hz excitations, following IEC 60034-18-41 guidelines for inverter-fed motor insulation system qualification. Subsequently, a probabilistic PDIV predictive model is developed based on Schumann’s streamer inception criterion (SCSIC). This expanded model then analyzes and forecasts the impact of the FR on PDIV and its associated dispersion level, within the context of the two-parameter Weibull distribution and the given environmental conditions. Furthermore, a novel method is presented to understand partial discharge (PD) phenomenology and its destructive potential in rectangular insulated wires with varying fillet radii. This approach employs SCSIC-derived streamer inception parameters (SIPs): critical field line length (CFLL), air effective ionization coefficient ( $\alpha _{\text {eff}}$ ), PD inception field ( ${E}_{\text {inc}}$ ), and firing voltage ( ${V}_{\text {firing}}$ ). The developed probabilistic predictive model enables the selection of an optimal FR value, facilitating the creation of a reliable insulation system with maximum PDIV and minimal PD-related damage.

Published
2024
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13. PDIV Modeling for Rectangular Wire Turn-to-Turn Insulation of Inverter Fed Motors Through Thermal Aging

Author

Naderiallaf, Hadi, Degano, Michele, and Gerada, Chris

Abstract

This contribution develops the partial discharge inception voltage (PDIV)-finite-element method (FEM)-based model based on Schumann’s streamer inception criterion (SCSIC) with respect to thermal aging time (TAGT) or the insulation lifetime for the turn-to-turn insulation of coil winding made by rectangular insulated wires. The accelerated thermal aging is performed at 250 °C, which is 50 °C higher than the thermal class, with aging intervals of 156 and 312 h. PDIV measurements are conducted at a constant temperature of 25 °C, 40% relative humidity, and atmospheric pressure (1013 mbar). The measurements are done under ac 50-Hz excitations, following IEC 60034-18-41 guidelines for inverter fed motor insulation system qualification. Furthermore, this study analyzes streamer inception parameters such as critical field line length (CFLL), effective ionization coefficient ( $\alpha _{\text {eff}}{)}$ , partial discharge (PD) inception field ( ${E}_{\text {discharge}}{)}$ , firing voltage ( ${V}_{\text {firing}}{)}$ , and its correlation with PD charge amplitude as a function of TAGT or the insulation lifetime.

Published
2024
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14. Design of an aircraft generator with radial force control

Author

Brecher, Christian, primary, Neus, Stephan, additional, Gärtner, Marcus, additional, Eckel, Hans-Martin, additional, Hoppert, Maik, additional, James, Barry, additional, Gerada, Chris, additional, Degano, Michele, additional, Ilkhani, Mohammad Reza, additional, and Di Nardo, Mauro, additional

Published
2023
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26. Design of an aircraft generator with radial force control

Author

Brecher, Christian, primary, Neus, Stephan, additional, Gärtner, Marcus, additional, Eckel, Hans-Martin, additional, Hoppert, Maik, additional, James, Barry, additional, Gerada, Chris, additional, Degano, Michele, additional, Ilkhani, Mohammad Reza, additional, and Di Nardo, Mauro, additional

Published
2022
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38. Design of an aircraft generator with radial force control

Author

Gärtner, Marcus, Brecher, Christian, Neus, Stephan, Hoppert, Maik, James, Barry, Gerada, Chris, Degano, Michele, Ilkhani, Mohammad Reza, and Di Nardo, Mauro

Subjects
Aircraft generator, Radial force control, Bearing friction, Bearing loads, Efficiency, Validation, Test rig, Shaft-bearingsystem
Abstract

With the increasing electrical energy demands in aviation propulsion systems, the increase in the onboard generators’ power density is inevitable. During the flight, forces coming from the gearbox or gyroscopic forces generated by flight manoeuvres like take-off and landing can act on the generator’s bearings, which can lead to wear and fatigue in the bearings. Utilizing the radial force control concept in the electrical machine can relieve loads from the bearings that not only minimize the bearing losses but also increase the bearings’ life. The objective of the MAGLEV project (Measurement and Analysis of Generator Bearing Loads and Efficiency with Validation) is to study, demonstrate, and test a new class of high-speed generators with radial force control. The concept is developed in an electrical machine and is validated on a test rig by measuring required parameters like shaft displacement, vibrations and bearings’ temperature. Additionally, the friction moment of each generator’s bearings is measured and validated in a separate test rig with a precise friction force measurement system under comparable conditions to the bearings’ loads in the generator. In this paper design steps of this type of generator and its test rig are presented and the measurement methodology used for radial force control is explained.

Published
2022
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39. Improved Thermal Modelling and Experimental Validation of Oil-Flooded High Performance Machines with Slot-Channel Cooling

Author

Zhang, Fengyu, Gerada, David, Xu, Zeyuan, Zhang, Xiaochen, Zhang, He, Gerada, Chris, Zhu, Mingjun, Xia, Liqun, Zhang, Wei, and Degano, Michele

Subjects
Automotive Engineering, Energy Engineering and Power Technology, Transportation, Electrical and Electronic Engineering
Abstract

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, either as an independent method or as a secondary heat transfer path which compliments traditional cooling systems. The slot-channel specific geometry and position effects on the thermal benefits are not thoroughly investigated in literature, while previous work focuses on passing fluid through the un-used space left in between coils forming concentrated windings. In this paper, slot-channel cooling is implemented within an oil-flooded cooling system for a high power density motor used as a pump. A flexible and detailed lumped parameter thermal network (LPTN) is proposed for the cooling system, with the LPTN used to optimize the slot-channel dimensions and location for obtaining maximum thermal benefits. Finally, a surface-mount permanent magnet (SPM) machine with the optimized slot channel geometry is built and tested to validate the thermal model, experimentally achieving an armature continuous current density in excess of 30A/mm2.

Published
2022

47. Design procedure and optimisation methodology of permanent magnet synchronous machines with direct slot cooling for aviation electrification.

Author

Tameemi, Ahmed, Degano, Michele, Murataliyev, Mukhammed, Di Nardo, Mauro, Valente, Giorgio, Gerada, David, Xu, Zeyuan, and Gerada, Chris

Subjects
*STATORS, *PERMANENT magnets, *SLOT machines, *OPTIMIZATION algorithms, *ELECTRIC machines, *ELECTRIFICATION, *MACHINE design
Abstract

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 enabling technologies, requiring the development of innovative design procedures. In this study, a preliminary design procedure for Surface Mounted Permanent Magnet Synchronous Machines (SPMSMs) intensively cooled by means of oil channels placed in the stator slots is proposed. The analytical derivation of SPMSM sizing equations, including the sub‐domain model and optimisation algorithm will be reported in detail. Indeed, both the electromagnetic and thermal equations of the machine are considered for the derivation of the sizing tool. As a result, the latter allows to capture variation of the machine design not only in terms of mechanical demands, such as power and speed, but also in terms of coolant characteristics, and can be effectively employed to perform trade‐off studies at a preliminary design stage. The proposed design tool will be used for a specific case study: The design of a high‐speed machine for an aerospace hydraulic actuator. The accuracy of the proposed design tool is validated for different parameters by comparing the results to experimental measurements performed on an existing 8‐pole 9‐slot prototype SPMSM. [ABSTRACT FROM AUTHOR]

Published
2023
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