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Scaling effects of inverter-induced bearing currents in AC machines
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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. doi:10.1109/TIA.2008.921378 ISSN 0093-9994.
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Official URL: http://dx.doi.org/10.1109/TIA.2008.921378
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) | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > 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 | ||||
Official Date: | May 2008 | ||||
Dates: |
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Volume: | Vol.44 | ||||
Number: | No.3 | ||||
Number of Pages: | 8 | ||||
Page Range: | pp. 769-776 | ||||
DOI: | 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 |
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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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