Investigation of additional AC losses in tooth-coil winding PMSM with high electrical frequency

Ilya Petrov, Mariia Polikarpova, Pavel Ponomarev, Pia Lindh, Juha Pyrhönen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

25 Citations (Scopus)


Stator winding structure and its manufacturing in permanent magnet synchronous machines (PMSM) is the vital part of the whole machine design. It is important to follow particular procedures in order to keep the winding losses at the acceptable level, which include DC resistance loss and additional losses due to alternative magnetic flux within the area of the stator winding. The winding transposition or using of Litz wire, which is effective way of proximity loss suppression, sometimes cannot be implemented due to challenges in assembling or cost aspects (especially in low cost PMSM solutions). In this case it is important to know consequences of using straight (non-twisting) windings in PMSMs with relatively high electrical frequency. This article studies impact of the number of stator winding parallel strands on the additional AC losses distribution in the slot where this winding is located. Also, thermal condition (which impacts the life time of the insulation) of the winding is analyzed with different number of parallel strands. Current and temperature distributions in the slot conductors were attained by finite element method (FEM). The total losses caused by additional AC losses in the winding were compared with the measurements results.
Original languageEnglish
Title of host publicationElectrical Machines (ICEM), 2016 XXII International Conference on
PublisherIEEE Institute of Electrical and Electronic Engineers
ISBN (Electronic)978-1-5090-2538-1, 978-1-5090-2537-4
ISBN (Print)978-1-5090-2539-8
Publication statusPublished - 2016
MoE publication typeA4 Article in a conference publication
Event22nd International Conference on Electrical Machines - Lausanne, Switzerland
Duration: 4 Sept 20167 Sept 2016
Conference number: 22


Conference22nd International Conference on Electrical Machines
Abbreviated titleICEM 2016


  • circulating current
  • eddy current
  • fractional slot PMSM
  • Permanent magnet machines
  • tooth-coil winding


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