I bought a fairly antique 20" Monarch bandsaw. It came with a gigantic (~16" diameter) 5HP electric motor. I'm not sure a bandsaw of this size needs this much motor, but since I have it, I'll try to use it.
The motor appears to be 5HP 3Phase, and probably 1730RPM. It is old enough that I can't find information about it on the 'net. In the US, power is supplied to residences in single phase, so I would like to size and buy an appropriate VFD/Inverter/starter to run it from 240VAC 1-phase at 220VAC 3-phase. It would be great to choose the run speed, have soft start so there's not a huge inrush current, and possibly use dynamic braking.
I've seen less expensive Chinese manufactured VFD's on ebay, but there's typically no consultation with the vendors, and caveat emptor. I have seen recommendations for sizing at multiples of up to 6 or 8 times Full Load Amps. Also I've seen it said with 1 to 2 HP motors that 2 x FLA is sufficient. The label is faded enough that I can't be sure about the listed FLA (12? 12.68? 12/6.8 at 220/440?) nor the motor efficiency.
One formula I found online shows to use ((HP x 746watts/HP) ÷ Efficiency) x √3(for 3phase) to get the KW required to size the VFD properly. It sounds right, but I can't read the necessary info from the motor badge so I wondered if anyone is familiar with this gear enough to make a recommendation?