NDLI: Eccentric position diagnosis of static eccentricity fault of external rotor permanent magnet synchronous motor as an in-wheel motor

Content Provider	IET Digital Library
Author	Ma, Conggan Gao, Yujiao Degano, Michele Wang, Yanyan Fang, Jianguang Gerada, Christopher Zhou, Shengsen Mu, Yuanye
Abstract	An eccentric position diagnosis method of static eccentricity (SE) fault of external rotor permanent magnet synchronous motor (ER-PMSM) is presented. Firstly, an analytical model of no-load radial magnetic field of ER-PMSM is established. Analytical models of no-load Back-EMF of both unit motors and the whole motor are carried out and are verified by finite element method (FEM) and experimental measurements. Then, the influences of SE ratio, SE circumferential angle, winding distribution mode and number of parallel branches on no-load radial magnetic field and no-load Back-EMF are analyzed based on these analytical models. The results show that SE does not affect the frequency characteristics of no-load radial magnetic field, but changes space order characteristics. On one hand, for ER-PMSM, of which the number of unit motors is equal to 1, SE causes no-load Back-EMF distortion. On the other hand, for ER-PMSM, of which the number of unit motors is greater than 1, SE does not affect no-load Back-EMF of the whole motor, but it still leads to no-load Back-EMF distortion of unit motors. Therefore, based on total harmonic distortion (THD) of no-load Back-EMF of unit motor, a projection method of intersection lines for SE fault diagnosis of ER-PMSM is proposed finally.
Starting Page	2263
Ending Page	2272
Page Count	10
ISSN	17518660
Volume Number	14
e-ISSN	17518679
Issue Number	Issue 11, Nov (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/14/11
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2019.0617
Journal	IET Electric Power Applications
Publisher Date	2020-07-27
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	A.C. Machine Analytical Model Back-EMF Eccentric Position Diagnosis Method Electric Potential ER-PMSM External Rotor Permanent Magnet Synchronous Motor Fault Diagnosis Finite Element Analysis Harmonic Distortion In-wheel Motor Magnetic Field Magnetic Potential Mechanical Component No-load Radial Magnetic Field Numerical Analysis Permanent Magnet Motors Rotors SE Fault Diagnosis Static Eccentricity Fault Synchronous Machine Synchronous Motors Unit Motor
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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