Effects of manufacturing tolerances of permanent magnets in fractional slot permanent magnet synchronous machines

  1. Zarate, Sergio 2
  2. Almandoz, Gaizka 2
  3. Ugalde, Gaizka 2
  4. Poza, Javier 2
  5. Escalada, Ana Julia 1
  1. 1 Orona EIC20120 Hernani Spain
  2. 2 Universidad de Mondragón/Mondragon Unibertsitatea
    info

    Universidad de Mondragón/Mondragon Unibertsitatea

    Mondragón, España

    ROR https://ror.org/00wvqgd19

Journal:
The Journal of Engineering

ISSN: 2051-3305,  2051-3305

Year of publication: 2019

Volume: 2019

Issue: 17

Pages: 4060-4064

Type: Article

DOI: 10.1049/JOE.2018.8199 GOOGLE SCHOLAR lock_openeBiltegia editor

More publications in: The Journal of Engineering

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Abstract

The fractional slot permanent magnet synchronous machines are well-known for their low torque ripple. However, in mass-production machines, not all the permanent magnets are identical due to the manufacturing tolerances and new torque harmonics could appear. In addition, the magnetic field is modified and unbalanced magnetic pull (UMP) could happen. Apart from that it is important to study the effect on vibrations since the magnetic field is no longer ideal. So, here, a study of the effect of unevenly magnetised permanent magnet distribution on torque ripples, unbalance magnetic pull, and vibrations is proposed. Apart from that, the tolerance grade sensitivity is studied. Finally, experimental tests show good agreement with finite element analysis.

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