Electric motor question
#13
TDKPE  Do you think that this could be a rebadged 50 cycle motor ?   The greater iron would account for some of the loss efficiency at 60 cycles.   Also the higher RPM for 60 cycles would increase the HP thus higher amperage.  Roly
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#14
It's possible, I suppose. There's definitely something odd about that motor. Loss of efficiency would occur at the higher frequency because the excitation is higher than the resonance frequency, so the windings/magnetics don't work the way they're designed. Unlike three-phase motors, you can't just maintain the volts-to-Hertz ratio when changing frequency on a single-phase motor. It's generally considered that you can't change frequency on a single-phase motor at all. So if it's working on 60Hz when it's designed for 50Hz, it's probably working poorly. But a 5 hp on the wrong frequency and 'working poorly' may still be working within the lower part of the (new) curve where the current is not exceeding the design limit for temperature while outputting no more than 3 hp. But efficiency and power factor are certainly going to suffer.

It's an interesting question.
Tom

“This place smells like that odd combination of flop sweat, hopelessness, aaaand feet"
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