Resumen de Determination of the weighted mean path length of the Epstein frame

Kong Qingyi, Zhiguang Cheng, Yana Fan, Lanrong Liu, Tao Liu, Jing Guo

• Purpose – The purpose of this paper is to investigate the effects of the related factors on the mean path length of the Epstein frame and propose a weighted method based on the different specific losses to decide the actual mean path length of the Epstein frame.

  Design/methodology/approach – Two Epstein frames of different dimensions (i.e. standard 25 cm and revised 17.5 cm Epstein frame) are used in experiments, and two kinds of the mean path lengths, lm1 and lm2, are defined based on the different specific iron losses produced at the middle part of the limb and the rest of the whole frame, respectively.

  Findings – The mean magnetic path varies with many factors such as peak flux density, excitation frequency, permeability as well as the anisotropy of the material under test.

  Originality/value – The results play an important role in designing the transformer core and the building factor.