Title :
Demagnetization assessment of 6-phase fractional-slot permanent magnet machines with low space harmonics under various fault conditions
Author :
Patel, Vipulkumar I. ; Wang, Jiacheng
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. of Sheffield, Sheffield, UK
Abstract :
The 6-phase fractional-slot per pole, per phase Interior Permanent Magnet (IPM) machine designed for a segment-A electric vehicle (EV) having a novel topology of 18-slot, 8-pole is assessed for the risk of partial irreversible demagnetization under various fault conditions. The paper describes the approach of demagnetization assessment using 2-D transient finite element analysis (FEA) for short circuit faults at the base speed and at the maximum cruise speed with rated and maximum load operation. The flux density of each node in each permanent magnet (PM) is decomposed in the magnetizing direction for a comprehensive assessment. The risk of demagnetization during the transient is evaluated, and the demagnetization levels in different PM poles under short circuit faults at different speeds are highlighted.
Keywords :
demagnetisation; electric vehicles; electrical faults; finite element analysis; harmonic analysis; magnetic flux; permanent magnet machines; transient analysis; 18-slot topology; 2D transient finite element analysis; 6-phase fractional-slot permanent magnet machines; 8-pole topology; EV; FEA; IPM machine; PM poles; flux density; interior permanent magnet machine; low space harmonics; partial irreversible demagnetization; segment-A electric vehicle; short circuit fault conditions; Demagnetization; Electric Vehicle; Fractional-slot winding; IPM machines; Short circuit fault;
Conference_Titel :
Power Electronics, Machines and Drives (PEMD 2014), 7th IET International Conference on
Conference_Location :
Manchester
Electronic_ISBN :
978-1-84919-815-8
DOI :
10.1049/cp.2014.0248
