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Combined thermofluid and electromagnetic optimisation of stator vent cooling

Bersch, K.; Nuzzo, S.; Connor, P.H.; Eastwick, C.N.; Galea, M.; Rolston, R.; Vakil, G.


K. Bersch

S. Nuzzo

C.N. Eastwick

Professor of Electrical Machines and Drives

R. Rolston


A combined electromagnetic and thermal modelling approach has been developed to optimise the design of multiple radial stator vents in an air-cooled, synchronous generator with a power rating of several hundred kVA. An experimentally validated 3-D Conjugate Heat Transfer Computational Fluid Dynamics model has been created and coupled with 2-D Electromagnetic Finite Element Analysis. Correlations between the combined vent width and rotor copper, rotor iron and stator iron losses were derived from the electromagnetic analysis. These correlations were implemented into the optimisation procedure of the parametric thermofluid model. Five parameters: vent locations, widths and the height of a baffle, were optimised simultaneously with the aim of minimising the peak stator winding temperature. The peak stator winding temperature was reduced by 11.1 %. The average stator winding temperature decreased by 6.3 %. To maintain the machine's power output, the removal of active stator material was compensated by increasing the rotor current.

Start Date Sep 3, 2018
Publication Date Sep 3, 2018
Publisher Institute of Electrical and Electronics Engineers
Book Title Proceedings: 2018 XIII International Conference on Electrical Machines (ICEM)
ISBN 9781538624777
APA6 Citation Bersch, K., Nuzzo, S., Connor, P., Eastwick, C., Galea, M., Rolston, R., & Vakil, G. (2018). Combined thermofluid and electromagnetic optimisation of stator vent cooling. In Proceedings: 2018 XIII International Conference on Electrical Machines (ICEM)doi:10.1109/icelmach.2018.8507231
Keywords Alternators, cooling; Electric machines; Electromagnetic modelling; Energy efficiency; Fluid dynamics; Generators; Magnetic losses; Thermal management
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