Thread: phase converters
Does anyone have any experience running a 10hp cnc router (plus 10hp vac pump) using a 3 phase converter?
If so, can you suggest a good UK manufacturer of rotary converters.
I don't have experience of running motors that big, but you're looking at 30A current at 240v under full load for each motor, and start up current is going to be far higher, which you'll really struggle with using any normal single phase supply.
Why not use a VFD? Obviously expensive for that size, but the starting current is much much less as you can set the acceleration to a long time. Still as m_c said 10hp/7.46kW is a lot for a normal supply, but will you actually be running the motors at full load?
The other issue is the motors might not be able to run on 240V, so you'd also have to factor in a step-up transformer. Even if the motors are capable of running on 240V, then you'll still need to change the control gear.
In short, it's going to be expensive.
I use a much smaller TransWave which I have been very happy with the tech support for, so would recommend you talk to them for a baseline of what would solve your requirement.
I am somewhat baffled about where this idea of running the motors at a lower voltage has come from, my rotary converter on 240v single phase gives 415v on 3 phases.
This article explains about the various ways:
Well clearly from the ebay article you cite Rotary phase converters are a thing of the past.
Edit - Sarcasm is so easy :-) The chap is clearly considering his options and they are problematic in any direction, I am sure he is aware of that and not planning to install in his attic !
Last edited by Jon S; 07-12-2011 at 03:20 PM.
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