Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Torque pulsation reduction in five-phase PMASyncRMs

  • Ghorbani, Hamidreza (Department of Electrical Engineering, Najafabad Branch, Islamic Azad University) ;
  • Moradian, Mohammadreza (Department of Electrical Engineering, Najafabad Branch, Islamic Azad University)
  • Received : 2021.06.09
  • Accepted : 2021.10.18
  • Published : 2022.01.20
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Abstract

This paper investigates two rotor configurations for five-phase permanent magnet assisted synchronous reluctance motor (PMASyncRM) in which the Ns/Np ratio remains equal to the number of phases and the minimization of torque pulsation, mainly cogging torque (Tcog), is desired. The proposed initial models have three layers of flux barriers per pole and are categorized as either A-type or B-type. The A-type has three layers of flux barriers where two of them are filled with PMs and the third one is left empty. The B-type has PMs inserted into all three layers of the flux barriers. Accordingly, based on torque analyses of the proposed models, the candidate that produces the lowest Tcog is selected for in-depth study. Thus, a sensitivity analyze is performed considering the length of the stator slot opening (Lso), the length of the air-gap (Lg), and the length of the 3rd flux barrier (Lb) as analysis parameters that are simultaneously taken into account. The outputs demonstrate that for the resultant values of Lso-Opt, Lg-Opt, and Lb-Opt, the value of Tcog declined considerably when compared with that of the initial motors. Finally, the optimized model is studied using 2-D finite element analysis (FEA) and the torque characteristics were compared with the initial model. The obtained results show that the optimized model provides much lower torque vibrations.

Keywords

References

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