>-----Original Message----- >From: Ken Javor [mailto:ken.ja...@emccompliance.com] >Sent: Friday, January 25, 2002 10:09 AM >To: emc-p...@majordomo.ieee.org >Subject: broadband RE from AC induction motors > > > >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. The control system is >bang-bang, just mechanical relays making >connections/disconnections based on >temperature and pressure inputs. The rep rate of the BB noise >is variable >but around 10 milliseconds. > >Thank you.
Possibly ESD caused by motion of the air over the rotor, with a regular discharge from a pole-piece? Can you relate the 10 ms interval to the RPM and number of pole-pieces? Ed Ed Price ed.pr...@cubic.com Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (Fax) Military & Avionics EMC Services Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis ------------------------------------------- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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.
