Binder, Andreas and Muetze, Annette (2008) Scaling effects of inverter-induced bearing currents in AC machines. In: IEEE International Electric Machines and Drives Conference (IEMDC 2007), Antalya, Turkey, May 03-05, 2007. Published in: IEEE Transactions on Industry Applications, Vol.44 (No.3). pp. 769-776.

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Abstract

In this survey paper, we show by straightforward mathematical scaling considerations that small inverter-fed ac motors of tip to typical 20 kW at 1500/min are likely to suffer from discharge (electric discharge machining) bearing currents, whereas larger motors are likely to be subjected to high-frequency (HF) circulating bearing currents. When comparing motors that operate at the same voltage level, the resulting bearing-current density is high for very small and very large motors. Smaller values occur in between these two extremes with medium size motors in the range of 10-100 kW. Therefore, electric bearing insulation is useful for larger motors to interrupt the HF circulating bearing-current path, whereas small motors need rotor shielding, common-mode voltage filters, or hybrid bearings.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH):	Bearings (Machinery), Electric machinery -- Bearing currents, Failure analysis (Engineering), Variable speed drives, Electric machinery -- Alternating current, Scaling laws (Statistical physics)
Journal or Publication Title:	IEEE Transactions on Industry Applications
Publisher:	IEEE
ISSN:	0093-9994
Date:	May 2008
Volume:	Vol.44
Number:	No.3
Number of Pages:	8
Page Range:	pp. 769-776
Identification Number:	10.1109/TIA.2008.921378
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Description:	Paper IPCSD-07-088, presented at the 2007 IEEE International Electric Machines and Drives Conference, Antalya, Turkey, May 3–5
Funder:	Arbeitsgemeinschaft Industrieller Forschungsvereinigungen (Germany) (AIF)
Grant number:	12584N (AIF)
Title of Event:	IEEE International Electric Machines and Drives Conference (IEMDC 2007)
Type of Event:	Conference
Location of Event:	Antalya, Turkey
Date(s) of Event:	May 03-05, 2007
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URI:	http://wrap.warwick.ac.uk/id/eprint/29912

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