Open AccessTorque characteristics enhancement of ring winding axial flux permanent magnet generator for direct‐drive wind turbine
Author(s) -
Gharehseyed Saber,
Vahedi Abolfazl,
Nobahari Amin,
Darjazini Amir
Publication year - 2020
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
ISSN - 1751-8679
DOI - 10.1049/iet-epa.2020.0150
Subject(s) - cogging torque , torque , magnet , turbine , torque ripple , control theory (sociology) , rotor (electric) , wind power , taguchi methods , permanent magnet synchronous generator , finite element method , mechanical engineering , electromagnetic coil , engineering , automotive engineering , direct torque control , computer science , structural engineering , electrical engineering , physics , induction motor , voltage , control (management) , artificial intelligence , thermodynamics , machine learning
Ring winding axial flux permanent magnet (PM) machine (RWAFPM) has recently been introduced, which is beneficial in terms of manufacturability and fault tolerability. This study aims to examine the use of RWAFPM for a small‐scale direct‐drive wind generator. The structural features of the RWAFPM make it subjected to remarkable cogging torque. Accordingly, the main efforts of this study are focused on finding a proper solution for its torque profile challenges. In this regard, extensive investigations are carried out on rotor design improvements. First, several schemes are analysed, separately, including pole skewing, pole arc ratio modifying, pole grouping and rotor disks shifting. Then an optimum combination of selected schemes is calculated by the Taguchi method and considering the mean torque value as well as the PM usage. It is demonstrated that significantly improved results could be achieved mainly through cost‐effective modified fabrication. The 3D finite element models are employed throughout the study along with some experimental measurements to verify the results.