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Archives of Electrical Engineering

The Journal of Polish Academy of Sciences

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Iron loss and eddy-current loss analysis in a low-power BLDC motor with magnet segmentation

Adrian Młot
  • Faculty of Electrical Engineering, Automatic Control and Informatics, Opole University of Technology, Luboszycka 7, 45-036 Opole, Poland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Mariusz Korkosz / Marian Łukaniszyn
  • Faculty of Electrical Engineering, Automatic Control and Informatics, Opole University of Technology, Luboszycka 7, 45-036 Opole, Poland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2012-03-12 | DOI: https://doi.org/10.2478/v10171-012-0003-5

Iron loss and eddy-current loss analysis in a low-power BLDC motor with magnet segmentation

This paper considers a Brushless Direct Current (BLDC) machine prototype with six poles and 36 stator slots including a three phase double-layered distributed winding. Presented modifications of rotor construction are identified in order to achieve the best possible compromise of eddy-current losses and cogging torque characteristics. The permanent magnet (PM) eddy-current loss is relatively low compared with the iron loss; it may cause significant heating of the PMs due to the relatively poor heat dissipation from the rotor and it results in partial irreversible demagnetization. A reduction in both losses is achieved by magnet segmentation mounted on the rotor. Various numbers of magnet segmentation is analysed. The presented work concerns the computation of the no-load iron loss in the stator, rotor yoke and eddy-current loss in the magnets. It is shown that the construction of the rotor with segmented magnets can significantly reduce the PM loss (eddy-current loss). The eddy-current loss in PMs is caused by several machine features; the winding structure and large stator slot openings cause flux density variations that induce eddy-currents in the PMs. The effect of these changes on the BLDC motor design is examined in order to improve the machine performance. 3-D finite-element analysis (FEA) is used to investigate the electromagnetic behaviour of the BLDC motor.

Keywords: BLDC motor; iron loss; eddy current losses; permanent magnet segmentation; cogging torque reduction; magnet layers

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About the article


Published Online: 2012-03-12

Published in Print: 2012-01-01


Citation Information: Archives of Electrical Engineering, Volume 61, Issue 1, Pages 33–46, ISSN (Print) 0004-0746, DOI: https://doi.org/10.2478/v10171-012-0003-5.

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