TY - JOUR
T1 - Flux-Modulated Relieving-DC-Saturation Hybrid Reluctance Machine with Synthetic Slot-PM Excitation for Electric Vehicle In-Wheel Propulsion
AU - Zhao, Xing
AU - Niu, Shuangxia
AU - Zhang, Xiaodong
AU - Fu, Weinong
N1 - Funding Information:
Manuscript received November 23, 2019; revised February 9, 2020 and March 31, 2020; accepted May 5, 2020. Date of publication May 27, 2020; date of current version March 22, 2021. This work was supported by Research Grant Council, Hong Kong, under Project 152509/16E. (Corresponding author: Shuangxia Niu.) Xing Zhao, Shuangxia Niu, and Weinong Fu are with the Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong (e-mail: [email protected]; [email protected]; [email protected]).
Publisher Copyright:
© 1982-2012 IEEE.
PY - 2021/7
Y1 - 2021/7
N2 - The reluctance machine with dc field coils in stator is an emerging brushless candidate for the in-wheel direct drive for its wide speed range and robust mechanical structure, while it suffers from relatively low torque density and efficiency, due to the poor excitation ability of dc field coils and worse extra dc saturation effect in the stator core. To address this issue, a new hybrid reluctance machine is proposed in this article, in which an integrated dual-layer PM source is introduced into stator slots, aiming to relieve dc saturation and, meanwhile, evoke flux modulation effect. In this way, the stator core utilization factor can be boosted due to dc saturation elimination by inner-layer slot permanent magnets (PM). On the other side, extra PM torque is generated by the flux modulation effect of outer-layer slot PMs. Hence, with synthetic assistance from dual-layer slot PMs, the torque density is improved distinctly especially under relatively high current density. Besides, slot PMs share a parallel magnetic circuit with dc field coils, which enables a bidirectional dc magnetization control for speed range extension. In this article, the proposed new topology is fully evaluated by both finite element (FE) analysis and prototype experiments.
AB - The reluctance machine with dc field coils in stator is an emerging brushless candidate for the in-wheel direct drive for its wide speed range and robust mechanical structure, while it suffers from relatively low torque density and efficiency, due to the poor excitation ability of dc field coils and worse extra dc saturation effect in the stator core. To address this issue, a new hybrid reluctance machine is proposed in this article, in which an integrated dual-layer PM source is introduced into stator slots, aiming to relieve dc saturation and, meanwhile, evoke flux modulation effect. In this way, the stator core utilization factor can be boosted due to dc saturation elimination by inner-layer slot permanent magnets (PM). On the other side, extra PM torque is generated by the flux modulation effect of outer-layer slot PMs. Hence, with synthetic assistance from dual-layer slot PMs, the torque density is improved distinctly especially under relatively high current density. Besides, slot PMs share a parallel magnetic circuit with dc field coils, which enables a bidirectional dc magnetization control for speed range extension. In this article, the proposed new topology is fully evaluated by both finite element (FE) analysis and prototype experiments.
KW - DC saturation
KW - flux modulation
KW - magnetic field regulation
KW - synthetic slot permanent magnets (PMs)
KW - torque density
UR - http://www.scopus.com/inward/record.url?scp=85103321629&partnerID=8YFLogxK
U2 - 10.1109/TIE.2020.2996140
DO - 10.1109/TIE.2020.2996140
M3 - Journal article
AN - SCOPUS:85103321629
SN - 0278-0046
VL - 68
SP - 6075
EP - 6086
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
IS - 7
M1 - 9102369
ER -