Comparison of AC Losses in the Winding of Electrical Machines with Fixed Strands Positions, Fixed Conductor Shapes and Random Winding

Anuvav Bardalai, David Gerada (), Tianjie Zou, Michele Degano, Chengming Zhang and Chris Gerada
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Anuvav Bardalai: Power Electronics, Machines and Control Group (PEMC), University of Nottingham, Nottingham NG7 2RD, UK
David Gerada: Power Electronics, Machines and Control Group (PEMC), University of Nottingham, Nottingham NG7 2RD, UK
Tianjie Zou: Power Electronics, Machines and Control Group (PEMC), University of Nottingham, Nottingham NG7 2RD, UK
Michele Degano: Power Electronics, Machines and Control Group (PEMC), University of Nottingham, Nottingham NG7 2RD, UK
Chengming Zhang: Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150000, China
Chris Gerada: Power Electronics, Machines and Control Group (PEMC), University of Nottingham, Nottingham NG7 2RD, UK

Energies, 2022, vol. 15, issue 15, 1-13

Abstract: In high performance electric machines, the increase of fundamental frequency leads to additional losses in the winding due to parasitic effects such as the associated skin and proximity effects. In the first part, this paper presents an investigation into accurate modelling of AC losses in the winding using numerical methods and their experimental verification. Then, using experimental motorette setups, this research provides a comparative study between fixed strand positioning and fixed conductor shapes on the AC losses in the winding. It is shown that the exact position of strands in the conductor is not a critical factor; however, it is very important to control the conductor shape inside the slot. In the final section of this paper, an investigation into the relationship between AC losses in the winding and copper filling factor is presented. It is shown experimentally that counter-intuitive design choices such as using a lower copper fill factor and thicker strand diameters may be beneficial in achieving the highest overall efficiency.

Keywords: AC copper loss; circulating currents; permanent magnet machines; proximity effect; windings (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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