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 motor current remains at its rated value ....
Regards, Ing. Gert Gremmen Approvals manager ------------------------------------------------------------------------------------ + ce marking of electrical/electronic equipment + Independent Consultancy Services + Compliance Testing and Design for CE marking according to EC-directives: - Electro Magnetic Compatibility 2004/108/EC - Electrical Safety 2006/95/EC - Medical Devices 93/42/EC - Radio & Telecommunication Terminal Equipment 99/5/EC + Improvement of Product Quality and Reliability testing + Education Web: www.cetest.nl (English) Phone : +31 10 415 24 26 ------------------------------------------------------------------- This e-mail and any attachments thereto may contain information that is confidential and/or protected by intellectual property rights and are intended for the sole use of the recipient(s) named above. Any use of the information contained herein (including, but not limited to, total or partial reproduction, communication or distribution in any form) by persons other than the designated recipient(s) is prohibited. If you have received this e-mail in error, please notify the sender either by telephone or by e-mail and delete the material from any computer. Thank you for your co-operation. -----Original Message----- From: Nyffenegger, Dave [mailto:dave.nyffeneg...@bhemail.com] Sent: Tuesday 27 September 2016 14:58 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: 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 acceleration/deceleration/braking. It may use the VFD to run the motor a various continuous speeds or varying speeds during operation. The VFD could be used to insure the rated input frequency is applied to the motor under continuous operation independent of the input power frequency. How do we get from a motor with a fixed frequency rating on its nameplate to proper operation with a VFD in the various applications it could be operated in? There are recommendations to use VFD rated motors but from what I have seen they are still rated at fixed frequency. -Dave -----Original Message----- From: Kunde, Brian [mailto:brian_ku...@lecotc.com] Sent: Tuesday, September 27, 2016 8:27 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: 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 countries How components are used cannot be controlled by manufacturer, so your due diligence is to ship each unit with conditions of acceptability and install/operate instructions that are scoped per the standards that would apply to the component and to the end-use equipment. Carefully control what is on your website and what your sales peoples say to customer. If a buyer or designer asks you about a use not within the nameplate ratings or instructions, the legally correct response is the unit has been assessed for use at the following operating conditions... blah. There are other things that can be said or done, but your risk increases. Do not offer 'probably will' advice unless you have empirical test data supporting those operating conditions; and never admit that you have test data for operations outside of the unit's ratings. Brian -----Original Message----- From: Kunde, Brian [mailto:brian_ku...@lecotc.com] Sent: Monday, September 26, 2016 7:39 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Using 60hz motors in 50hz countries Dear experts, Can AC brushless motors (in this case 230V~ 3-phase 3hp motors) that are rated "60HZ" be used in products going to countries that have 50HZ power? I believe the motors will run a little slower which will not affect the function of the product, but is there a safety issue with this? The motors are thermally, overload, and short circuit protected. They are "intermittent use" and not likely to overheat. As a rule, we only market and sell such products to countries with 60hz power. However, a North America company might purchase one and ship it to one of their international locations with 50hz power without our knowledge. Do we need to be concerned about this? Of course, this fact has our sales force wondering if it is OK to market and sell 60hz motor driven products in countries with 50hz. I really don't know. I cannot see a safety issue but one can say that the motor would be used in a way it is not intended to be used resulting in a higher risk if something did happening. Any opinions on this? Thanks, The Other Brian ________________________________ LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> ________________________________ LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
