TY - GEN
T1 - Impact of Axial Shapes of Circumferential Modes on Electromagnetic Noise in Outer-Rotor Permanent-Magnet In-Wheel Motors
AU - Yin, Hang
AU - Niu, Shuangxia
AU - Hua, Wei
AU - Wang, Guangchen
N1 - Publisher Copyright:
© 2024 IEEE.
PY - 2024/11
Y1 - 2024/11
N2 - Circumferential modes are recognized as the primary contributors to electromagnetic (EM) noise of permanent-magnet (PM) in-wheel motors (IWMs), whereas their axial shapes have not been thoroughly investigated. Given the significance of axial shapes in outer-rotor (OR) structures, this paper aims to investigate the impact of axial shapes on the EM noise of a 72-slot/80-pole OR-IWM. Finite element analysis (FEA) is used to predict the main circumferential modes of the rotor. The uneven distribution of axial shapes is observed and also verified by the modal test. A coupled-field FEA model is subsequently established, demonstrating that the variation of the modal amplitude of each segment can result in significant differences in velocity responses. To reveal the impact, the circumferential mode shapes of each segment are axially reduced and expressed by the Fourier series. The findings indicate that, in addition to amplitude variation, rotor skewing also generates phase variations in mode harmonics, which should be carefully considered in the design of OR-IWMs.
AB - Circumferential modes are recognized as the primary contributors to electromagnetic (EM) noise of permanent-magnet (PM) in-wheel motors (IWMs), whereas their axial shapes have not been thoroughly investigated. Given the significance of axial shapes in outer-rotor (OR) structures, this paper aims to investigate the impact of axial shapes on the EM noise of a 72-slot/80-pole OR-IWM. Finite element analysis (FEA) is used to predict the main circumferential modes of the rotor. The uneven distribution of axial shapes is observed and also verified by the modal test. A coupled-field FEA model is subsequently established, demonstrating that the variation of the modal amplitude of each segment can result in significant differences in velocity responses. To reveal the impact, the circumferential mode shapes of each segment are axially reduced and expressed by the Fourier series. The findings indicate that, in addition to amplitude variation, rotor skewing also generates phase variations in mode harmonics, which should be carefully considered in the design of OR-IWMs.
KW - Axial shape
KW - circumferential mode
KW - electromagnetic (EM) noise
KW - in-wheel motor (IWM)
UR - http://www.scopus.com/inward/record.url?scp=85212275540&partnerID=8YFLogxK
U2 - 10.1109/SCEMS63294.2024.10756450
DO - 10.1109/SCEMS63294.2024.10756450
M3 - Conference article published in proceeding or book
AN - SCOPUS:85212275540
T3 - IEEE Student Conference on Electric Machines and Systems (SCEMS)
SP - 1
EP - 6
BT - IEEE 7th Student Conference on Electric Machines and Systems, SCEMS 2024
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 7th IEEE Student Conference on Electric Machines and Systems, SCEMS 2024
Y2 - 6 November 2024 through 8 November 2024
ER -