Open Physics (Mar 2018)

Model of the multipolar engine with decreased cogging torque by asymmetrical distribution of the magnets

  • Goryca Zbigniew,
  • Paduszyński Kamil,
  • Pakosz Artur

DOI
https://doi.org/10.1515/phys-2018-0008
Journal volume & issue
Vol. 16, no. 1
pp. 42 – 45

Abstract

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This paper presents the results of field calculations of cogging torque for a 12-pole torque motor with an 18-slot stator. A constant angular velocity magnet and the same size gap between n-1 magnets were assumed. In these conditions, the effect of change of the n-th gap between magnets on the cogging torque was tested. Due to considerable length of the machine the calculations were performed using a 2D model. The n-th gap for which the cogging torque assumed the lowest value was evaluated. The cogging torque of the machine with symmetrical magnetic circuit (the same size of gap between magnets) was compared to the one of the asymmetrical machine. With proper choice of asymmetry, the cogging torque for the machine decreased by four times.

Keywords