Can't say if it's true or not about the standards but the technical reason is that an induction motor operating in steady-state mode draws current proportional to the applied potential and the mechanical load - it generates no noise.
Years ago there was a specific exclusion in MIL-STD-461 for things like light bulbs and ac induction motors - they were exempt from EMI testing. > From: [email protected] > Reply-To: [email protected] > Date: Fri, 12 Dec 2003 09:44:07 +0800 > To: [email protected] > Subject: another questions > > > > > > > Dear all, > > Someone tell that induction motor is excluded from the scope of EMC > directive ! > Can anyone tell me whether it's ture? If it's true why? > > > TUV Rheinland -CCIC(Ningbo) Co., Ltd. > Zhang qiaofeng > Project Engineer > 13th Floor, Golden Port Hotel > 51 Yang Shan Road, Ningbo 315020, P. R. China > Tel:86-574-87671566-227 > Fax:86-574-87672566 > E-mail:[email protected] > Visit us at <http://www.chn.tuv.com> > _____________________________________ ________________________________________ > ______________________ > > This email message and any attachments is confidential and intended only > for the use of an individual or entity named above and may contain > information that is privileged, confidential or exempt from disclosure > under applicable law. If you are not the intended recipient, you are > notified that any dissemination, distribution or copying of this email is > strictly prohibited. > TUV Rheinland Ningbo Ltd. does not accept liability for any errors, > omissions, corruption or virus in the contents of this message or any > attachments that arise as a result of e-mail transmission.If you have > received this communication in error, please notify the sender immediately > and delete the original message and its attachments immediately. > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ieee-pses.org/ > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: [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: > http://www.ieeecommunities.org/emc-pstc > This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [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: http://www.ieeecommunities.org/emc-pstc
