Re: [PSES] Using 60hz motors in 50hz countries

I think that VFD ensure that the magnetic forces in the motor remain the same. Magnetic forces are 1:1 related to motor current. This way a substantial amount of torque remains available at each frequency The key is simply keeping the drive voltage linearly related to the frequency, so as the moto

Re: [PSES] Counterfeit tracking

There have been some consistency problems with this service, probably from usage of direct CSS url links and/or my stupid brute-force script, so my simple-minded approach is to have my crawler run the login(which has changed several times), then resolve the href-tagged links, then go from there

Re: [PSES] Counterfeit tracking

Hopefully - I am doing this right - this is my first post. I recently found Notify U.S. https://tsapps.nist.gov/notifyus/data/home/home.cfm which is run by the NIST in the Dept. Of Commerce and it notifies me of anything published by the WTO an others. You can filter it by field of interest an

Re: [PSES] Counterfeit tracking

Thanks, I'll check out DuckDuckGo, it sounds like it may have possibilities. I have looked at rss aggregators in the past. It's kind of hard to find one that consolidates similar postings in multiple locations. This also may be worth another look. All the best. Doug.   Original Message  

Re: [PSES] Counterfeit tracking

Distill will monitor selected pages, but is not very selective. And indiscrete browser plugins are not good for a corporate computer. You still need something to traverse the web and find new/alternate regulatory information. Related - there are commercial aggregation services for compliance eng

Re: [PSES] Using 60hz motors in 50hz countries

It's slightly off topic, but I thought I would share this sign from the days when you didn't want somebody to try to run their 25 Hz motor on a 60 Hz circuit. Ted Eckert Microsoft Corporation The opinions expressed are my own and do not necessar

Re: [PSES] Using 60hz motors in 50hz countries

Pleased to see the 3 Amigo's. er, 3 Brian's working thru this issue. :>) :>) br, Pete Peter E Perkins, PE Principal Product Safety & Regulatory Affairs Consultant PO Box 23427 Tigard, ORe 97281-3427 503/452-1201 p.perk..

[PSES] Counterfeit tracking

Hi all, I suspect there are many compliance engineers that do what I do. Once in a while I skim the various public notices web pages for the major certifying agencies to see if there is anything i should be aware of, although I am not very diligent about this. I did find a collection of public n

Re: [PSES] Using 60hz motors in 50hz countries

I will raise another question to stir the pot and solicit comments from the motor experts. We use AC motors driven from VFDs which by definition vary the frequency to the motors. There are many different ways an application may run. It may use the VFD simply to provide some control of motor

Re: [PSES] Using 60hz motors in 50hz countries

Thanks to all for the good advice. It was more helpful than you can imagine. The Other Brian -Original Message- From: Brian O'Connell [mailto:oconne...@tamuracorp.com] Sent: Monday, September 26, 2016 1:37 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Using 60hz motors in 50hz cou

Re: [PSES] Using 60hz motors in 50hz countries

By applying a 60 Hz motor to 50 Hz you (your customer) violates one of the principles of building machines. The principle is that safe machines are built using safe components. The latter cannot be guaranteed anymore, so the machine is unsafe. Full stop. This is the agency way of safety thinkin