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922 results on '"Gerada, Chris"'

104. 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

127. Electrical Machine Slot Thermal Condition Effects on Back Iron Extension Thermal Benefits

Author

Zhang, Fengyu, Gerada, David, Xu, Zeyuan, Tighe, Chris, Zhang, He, Yan, Liang, and Gerada, Chris

Abstract

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 downwards into the slot, back-iron extension (BIE) shortens the heat dissipation path from the slot coil to the back-iron and was proven to be an effective thermal improvement technique. The relationship between BIE thermal benefits and various electrical machines’ parameters remains to be investigated. Based on an existing concentrated-wound machine, the relationship between the equivalent slot thermal conductivity (ESTC) and the back-iron extension effectiveness is researched in this paper. Utilizing a developed 3D thermal model, the equivalent slot thermal conductivity effects on the temperature reduction with BIE are indicated with simulation results and verified with experimental tests. BIE is reported to provide temperature reductions ranging from 48°C down to 18°C across the plausible range of ESTC values considered. Guidelines are given in the final part to suggest the situations under which BIE is more effective.

Published
2021

133. Research and Realization of High-Power Medium-Voltage Active Rectifier Concepts for Future Hybrid-Electric Aircraft Generation

Author

Trentin, Andrew, primary, Sala, Giacomo, additional, Tarisciotti, Luca, additional, Galassini, Alessandro, additional, Degano, Michele, additional, Connor, Peter H., additional, Golovanov, Dmitry, additional, Gerada, David, additional, Xu, Zeyuan, additional, La Rocca, Antonino, additional, Eastwick, Carol N., additional, Pickering, Stephen J., additional, Wheeler, Patrick, additional, Clare, Jon C., additional, and Gerada, Chris, additional

Published
2021
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138. 4-MW Class High-Power-Density Generator for Future Hybrid-Electric Aircraft

Author

Golovanov, Dmitry, primary, Gerada, David, additional, Sala, Giacomo, additional, Degano, Michele, additional, Trentin, Andrew, additional, Connor, Peter H., additional, Xu, Zeyuan, additional, Rocca, Antonino La, additional, Galassini, Alessandro, additional, Tarisciotti, Luca, additional, Eastwick, Carol N., additional, Pickering, Stephen J., additional, Wheeler, Pat, additional, Clare, Jon, additional, Filipenko, Mykhaylo, additional, and Gerada, Chris, additional

Published
2021
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