We have been requested to look into implementing electronics to thermally protect a motor i.e. not have a separate conventional fuse / thermostat etc type approach. UL 1004-7 seems to be the correct standard for Electronically Protected Motors and it looks like anything implemented will have to meet the requirements of UL 60730-1. I am assuming that if software is involved certification becomes much more difficult, correct? Has anybody got any useful advice?

HI Ilan, thanks for your comment. We already use MISRA Cdue to all of our automotive work but I suspect good old conervative UL will ask us to jump through more hoops than that! It is safety critical after all.

You might be surprised , people are changing , even good old UL is changing , if it worth doing the effort then do it , after all to say NO is the easiest way isn't it?

I beliver I may have 1-2 motor manufacturers who will quote this motor

Would need your spec's

Thank you
michel@applied-dynamics.com

Michel - you missed the point of my posting. We are looking to design the electronics to provide a UL approved Electronically Protected Motor!!