Torque characteristics enhancement of ring winding axial flux permanent magnet generator for direct‐drive wind turbine. Issue 9 (17th June 2020)

• Record Type: Journal Article
• Authors: Gharehseyed, Saber; Vahedi, Abolfazl; Nobahari, Amin; Darjazini, Amir
• Is Part Of: IET electric power applications. Volume 14:Issue 9(2020)
• Page Start: 1584
• Page End: 1591
• Publication Date: 2020-06-17
• Subjects: machine windings -- Taguchi methods -- torque -- wind turbines -- permanent magnet generators -- finite element analysis -- rotors -- fault tolerance -- wind power plants; direct‐drive wind turbine -- fault tolerability -- direct‐drive wind generator -- structural features -- cogging torque -- torque profile -- rotor design improvements -- pole grouping -- rotor disks -- mean torque value -- axial flux permanent magnet generator -- pole skewing -- ring winding axial flux permanent magnet machine -- PM RWAFPM -- pole arc ratio modification -- Taguchi method -- cost‐effective modified fabrication -- 3D finite element models -- torque characteristics enhancement; Electric power -- Periodicals; Electric power systems -- Periodicals; 621.305
• DOI: 10.1049/iet-epa.2020.0150
• Languages: English
• ISSNs: 1751-8660

Abstract

Abstract : 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.