I am testing a couple of 3 phase motors I have acquired. I have a single phase to 3 phase 3/4 hp rotary converter that generates the 3 phase field. I have checked a couple motors but when I tested 2 Baldor motors I tripped my fused switches. The first heated my switch red hot and the second turned slowly then killed my FRS 5 fuses in my converter set up. Both were 2-3 hp but I checked a different manufacturer 3 hp motor and it ran fine. So at this point I need to get more fuses. I had the motors wired for low voltage to match my 240 supply. I checked these wiring configurations thoroughly.
How do I test these 3 phase motors? I checked resistance between a 3 leads and measured a couple of ohms each. No spikes.
Also, I am looking to use these 3 phase motors for an idler in a separate rotary phase converter. I have read about getting a balanced voltage. Would this be just measuring the 3 voltages from the 3 different combinations of leads? What is a decent balanced voltage supply - say for mills or lathes?
Thanks Pal