The maximum current is the limiting factor here. You would have to be the judge on that, but it most certainly can be done. The load is reduced to 56%, so there are limitations. It is (was in my day) called "open delta". Third: It is quite possible to run 3 phase transformation with 2 transformers. Of course, they must be the same voltage ratings. For a 1 KVA load, a single 1 KVA transformer and two 1.5 KVA transformers work fine. They needn't even be the same size, so long as the smallest has the capacity for the load. For a hobbyist, 3 single phase transformers are the same thing just not in one enclosure. Next: A 3 phase transformer is nice, they reduce the overhead and auxillary equipment for a "new" install. With 550 volts common in Canada, I would speculate that a 550 volt motor could be run at 480 volts with reduced horse power. That's not to say all of it is, just what I have encountered.įirst: A 3 phase motor will run at reduced voltage with little or no problem except the reduced power. Most 2 phase I have encountered was at 90 electrical degrees. With 3 phase motors, the three phases are at 120 electrical degrees from each other. Such as the 2 sides of a 240 volt split into two 120 volt lines. Motors: Single phase on high voltage winding the two phases are at 180 electrical degrees to each other. I haven't worked with 2 phase since I was in the Pacific in ~'84-5. The two are distinctly different but read the same with an ohmmeter. When you say the motor is "2 phase", is that truely what it is? Or single phase with a center tap. But many machines have multiple motors, our surface grinder for instance has 5 motors, and many of them are hard to source.įor more specific help give us the machine type and details. Replace the original equipment motor(s) with either single phase 240v motor if possible or replace with 3 phase 240v motor and then add a variable frequency drive. This is why those who go this route size their rotary phase converters and transformers to allow for the use of more than one machine to make it economically viable. This equipment alone runs over $2000 CAD making that "cheap" machine much more expensive. In our situation we needed to convert single phase 240v residential power to 3 phase 240v power and then use a 3 phase transformer to step the voltage up to 600v that our machine can run on. Most commercial machinery in Ontario and Alberta is 3 phase 575v. I suspect that the machine is really 3 phase 550v like my surface grinder is. Please advise how you know the machine is 2 phase.
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