Open AccessAnalysis of coupling between two sub‐machines in co‐axis dual‐mechanical‐port flux‐switching PM machine for fuel‐based extended range electric vehicles
Author(s) -
Zhou Lingkang,
Hua Wei,
Wu Zhongze,
Zhu Xiaofeng,
Yin Fangbo
Publication year - 2019
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
ISSN - 1751-8679
DOI - 10.1049/iet-epa.2018.5400
Subject(s) - stator , coupling (piping) , flux linkage , flux (metallurgy) , cogging torque , torque , magnet , crank , harmonics , field (mathematics) , counter electromotive force , materials science , physics , voltage , electrical engineering , engineering , mechanical engineering , direct torque control , induction motor , mathematics , thermodynamics , pure mathematics , metallurgy , cylinder
The permanent magnet (PM) field coupling between inner and outer machines of co‐axis dual‐mechanical‐port flux‐switching PM (CADMP‐FSPM) machines is investigated. Firstly, the relationships between the inner and outer stator teeth are analytically evaluated, with three key stator teeth types defined, i.e. series, parallel, and independent teeth. Secondly, the negative effects of PM field coupling, including high even‐order electromotive force (EMF) harmonics, three‐phase EMFs asymmetry and DC bias component in flux‐linkages, are investigated and verified by two CADMP‐FSPM machines, namely, 5/6–12/22, and 5/6–18/42 structures. It is found that for avoiding the negative effects of PM field coupling, all inner and outer stator teeth types should be the same, thus, a 10/12–12/22 structure CADMP‐FSPM machine is introduced for analysis. Thirdly, the performance of the 10/12–12/22, 5/6–12/22, and 5/6–18/42 structures, featured by PM field distributions, d‐axis flux‐linkage ripples, cogging torques, electromagnetic torques, losses and efficiencies, are comparatively analysed by finite element (FE) analysis. The results indicate that the 10/12–12/22 structure exhibits the lowest PM field coupling level and the best performance. Moreover, the 10/12–12/22 structure can avoid all the negative effects of PM field couplings. A prototyped 10/12–12/22 CADMP‐FSPM machine is built and tested to verify the FE predicted results.