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# Bearing currents and faraday cage

- To: <femm@yahoogroups.com>
- Subject: Bearing currents and faraday cage
- From: "Polychronis Vallianatos" <rotechen@otenet.gr>
- Date: Sat, 7 Dec 2002 21:06:31 +0200

Dear Dave, dear All, there is a usual problem,in Variable SpeedDrive (VSD), with fast switching valves (eg IGBTs), the premature bearing failure, due to Electrically induced flutting. The common mode induced currents, break the lubricant film, discharging the common mode voltage to the grounded end shield. One of the remedies is the Faraday Cage, in the motor Air Gap. this could have the form of a copper foil,or conductive paint. How could this be modeled by FEMM ? How could FEMM take in account the high frequencies that the phenomenon take place (or fast voltage rise times? eg 30V / microsec)? Has anyone done like that in FEMM, or do you propose any Paper on the Topic? Do anyone have any FEMM modeled Variably Frequency Driven Motor? Thanks in Advance, Chronis pvallian@yahoo.com rotechen@otenet.gr

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