NDLI: Analytical synthesis of air-gap field in permanent magnet machines with rotor eccentricity by superposition method

Content Provider	IEEE Xplore Digital Library
Author	Li, Y. Zhu, Z. Li, G. Wu, D.
Copyright Year	2015
Description	Author affiliation: Dept. of Electron. & Electr. Eng., Univ. of Sheffield, Sheffield, UK (Li, Y.; Zhu, Z.; Li, G.; Wu, D.)
Abstract	Summary form only given. Permanent magnet (PM) machines have been widely employed in electric vehicles, wind power generators, domestic appliances, and industrial servos etc. When the rotor is eccentric, either static or dynamic due to manufacturing or operating tolerances, the full machine model is necessary for finite element analysis (FEA), because the model cannot be simplified by utilizing the periodicity any more. This is problematic and time-consuming for FEA especially when the slot number and pole number are high, such as in direct-drive low-speed PM machines. This paper proposes a new analytical model which combines the superposition method and the subdomain method [1] for predicting air-gap field in PM machines with rotor eccentricity. A 12-slot/10-pole surface-mounted PM machine is taken as example to illustrate the developed method. The original machine with rotor eccentricity, Fig.1(a), is divided into a number of air-gap sections along the circumference. For each air-gap section, an equivalent air-gap length is determined, corresponding to the center point of the slot opening in this example. Then, the subdomain method is employed for each of concentric models with different equivalent air-gap lengths to analytically synthesize the air-gap field in the original eccentric machine. By way of example, Figs.1(b), (c) and (d) show 3 concentric models according to the three selected air-gap lengths shown in Fig.1(a) respectively. It is worth noting that the whole synthesis process can be carried out analytically and integrated into the CAD software. The open-circuit air-gap flux densities and back-EMFs obtained by the proposed superposition method is shown in Fig.2 and validated by the direct FEA for a specific rotor eccentricity. The results clearly show that 3 phase back-EMFs are unbalanced due to rotor eccentricity. Therefore, it has demonstrated that the proposed method can accurately predict the air-gap field in PM machines with rotor eccentricity and can be used to predict the electromagnetic performance. The details of analytical method and application to a very high slot and pole number PM machine will be given in the full paper .
Starting Page	1
Ending Page	1
File Size	384702
Page Count	1
File Format	PDF
e-ISBN	9781479973224
DOI	10.1109/INTMAG.2015.7157606
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-05-11
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Air gaps Rotors Solid modeling Analytical models Atmospheric modeling Permanent magnet machines Electrical engineering
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in