NDLI: Bearing lifetime of linear PM machines

Content Provider	IEEE Xplore Digital Library
Author	Paulides, J.J.H. Janssen, J.L.G. Lomonova, E.A.
Copyright Year	2009
Description	Author affiliation: Eindhoven University of Technology, P.O. box 513, 5600 MB, The Netherlands (Paulides, J.J.H.; Janssen, J.L.G.; Lomonova, E.A.)
Abstract	With the ever advancement and increased force density of slotted brushless linear permanent magnet (PM) actuators the attraction forces become more dominating. In the early years this attraction force was advantageous, although that it now becomes a problem due to the reduced bearing lifetime. This lifetime is influenced by the lubrication, rolling contact fatigue, time of operation, metal selection and pre-loading. As such, the attraction force of slotted linear permanent magnet machines has to be compensated to extend the maintenance free operating time of contactless Pick-and-Place robots. This has been achieved by counteracting the attraction force with passive permanent magnets placed underneath a soft-magnetic plate. Various ways to calculate the attraction force will be explained in this paper, where it will be shown that 2D finite element analysis suffices and that implementing this passive attraction force compensation considerably extends the bearing life.
Starting Page	1083
Ending Page	1090
File Size	1518603
Page Count	8
File Format	PDF
ISBN	9781424428939
DOI	10.1109/ECCE.2009.5316359
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-09-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Actuators Brushless motors Brushless machines and electrical machines Bearings Linear synchronous motors Synchronous motors Permanent magnet motors Fatigue Permanent magnets Electromagnetic analysis Robotics and automation Robotic assembly Service robots Hydraulic actuators Linear motors Lubrication Magnetic levitation
Content Type	Text
Resource Type	Article

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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
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