Another way to think about induction motors with regard to EMC: An induction motor is essentially a transformer in which the secondary winding is free to rotate (and is short circuited). Don Borowski Schweitzer Engineering Labs Pullman, WA Ian Gordan wrote on 12/12/2003 12:59:05 AM: > > Ken et al > In some of our products the only electrical components are induction motors. > Thus we commissioned a statement as to whether these may be considered > benign under the EMC directive. > The relevant part of the report is as follows: > > Benign components and equipment are exempt from the requirements of the EMC > Directive. The general definition of such equipment is that it is passive > by nature and incapable of generating an emission disturbance conducted on > power lines or radiated into the environment or to be susceptible to > disturbances coupled through cables or radiated directly to the device. > Generally benign devices will be relatively simple and consist of passive > components such as resistors and capacitors and will contain no active > electronic devices or high frequency converters, oscillators or clock > sources. Transformers are specifically exempt and in the guidance notes to > the EMC Directive, induction motors are exempt. > > You should obtain a similar assessment of your products by a competent body > such as ERA > http://www.era.co.uk/ . I don't work for them - so I think I am allowed to > promote them! > > > Ian Gordon 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
