OK thanks. If they don't really make the 50 Hz different than the 60 Hz, then it sounds like I can't get away from the 5/6 derate anyway, then I agree there is no reason to goto a hard to find motor.
My load is 119 HP at 47 Hz, so I am ok, just not alot of safety factor which is what led me to...
Thank you for your comments. Here are some more details behind my initial question.
So I am working on an application right now that is not uncommon in the Heating Vent Cooling Industry. I have an Air Handler with (3) 150 HP motors. It will in fact by a Variable Speed load with the fans that...
Basic issue is that I have 1500 RPM loads that are direct drive all the time. I would love to not derate motors by being so far off rated rpm. So can I use a 50 HZ motor driven by 60 HZ and a VFD? Looking at Direct Driven loads matched with motors; in the US for 60 HZ we have 900, 1200, 1800...
