I read in !emc-pstc that Ken Javor <[email protected]> wrote (in <20020125180848.LRWV20810.femail29.sdc1.sfba.home.com@[65.11.150.27] >) about 'broadband RE from AC induction motors', on Fri, 25 Jan 2002: >Do any forum members have knowledge of a mechanism by which ac induction >motors (two are fan motors, one a compressor motor) can generate broadband >RE from 30 - 600 MHz? This is outside my experience. Are there perhaps >degradation modes that result in arcing? The motors run off three phase 400 >cycle power, 115 Volts rms phase to neutral.
Yes, marginal breakdown of insulation, or loose connections, can generate broadband r.f. emission. To eliminate the control equipment, temporarily run one of the motors straight from the mains. Don't forget to *switch off* the control equipment and the other motors during this test -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. PLEASE do NOT copy news posts to me by E-MAIL! ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
