Influence of inter‐turn short‐circuit fault on the loss of high speed permanent magnet generator with Gramme ring windings. Issue 5 (1st May 2019)

• Record Type: Journal Article
• Authors: Qiu, Hongbo; Zhao, Xifang; Wei, Yanqi; Ran, Yi; Yang, Cunxiang
• Is Part Of: IET power electronics. Volume 12:Issue 5(2019)
• Page Start: 1256
• Page End: 1262
• Publication Date: 2019-05-01
• Subjects: eddy currents -- permanent magnet generators -- permanent magnet motors -- temperature distribution -- eddy current losses -- stators -- finite element analysis -- machine windings; fault phase -- healthy phase copper loss -- inter‐turn short‐circuit fault -- high speed permanent magnet generator -- Gramme ring windings -- high‐frequency loss -- loop current -- magnetic field -- influence mechanism -- ITSC fault -- two‐dimensional finite element model -- 60 rpm HSPMG -- 000 rpm HSPMG -- eddy current density -- eddy‐current loss -- core losses -- different positions -- stator core -- power 117.0 kW; Power electronics -- Periodicals; 621.31705
• DOI: 10.1049/iet-pel.2018.6097
• Languages: English
• ISSNs: 1755-4535

Abstract

Abstract : The primary problem brought by high speed is high‐frequency loss. The loop current (LC) of inter‐turn short‐circuit fault causes serious distortion of the magnetic field in high speed permanent magnet generator (HSPMG), whose effects on the loss cannot be ignored. In order to reveal the influence mechanism of ITSC fault on the loss, the two‐dimensional finite element model of the 117 kW, 60, 000 rpm HSPMG is established. By comparing calculation results and test data, the accuracy of the model is verified. The distribution of the eddy current density is studied, and the fundamental reason for the sharp increase of eddy‐current loss after fault is found. The core losses at different positions were obtained by segmenting stator core, and the variation mechanisms of core losses at different positions are revealed. The change of heat source distribution of stator core after fault is determined. The variation of winding copper loss after fault is analysed, and the influence degree of the LC on the fault phase and healthy phase copper loss is determined. In addition, because the temperature field is directly related to the loss, the research also laid a foundation for the next analysis of the temperature field.