The Shop > Electronics & IC Programing
Rotary Converters
Bluechip:
Darren
'Course it's feasible, I was faffin about with such stuff 50 yrs ago. Why the guy thinks it's remarkable enough to put it on Youtube is anyones guess.
This is all he's doing. As he says, there is an imbalance on the output.
'***kin understatement, that is. :scratch:
John Hill is quite right. It is used as an autotransformer.
Not a practical solution except maybe for very low output motors. As soon as you load the thing the output droops a lot.
With todays 1ph. to 3ph. VFD's, who wants to go pratting about with this stuff ??
Dave BC
Darren:
Thanks Dave,
I was guessing it would be something like that, but I was thinking as you would be asking the motor to generate the stepped voltage on three legs as well as the third 240V phase it would be asking a lot of it.
With no 415V input backed by a never ending mains supply I could see how the output could be limited for heavier loads.
Bluechip:
Darren
If you look at the second part of the vid. the (apparently 1HP ie 746W) motor is unloaded !!
I doubt if that is sucking much more than 40-50W. There are only the I^2 x R losses, a bit of hysteresis loss and the bearing friction to load it.
I wonder what would happen with a 10" saw blade on it?
As far as I know, these VFD's rectify the AC input, then squeeze it and chop it into a sort of square or pseudo-square wave 3ph.
So, the VFD is doing most of the work.
Hmmmm .. I'll give it a miss I think ..
Why don't you have a go ... :lol:
I believe it's Character Building :lol:
Dave BC
Darren:
Hi Dave I did have a go once, about 2 yrs ago. But I could not get the output when I started the lathe up. The lathe just bogged down.
I was just trying to find out if I got something wrong, but I don't think so. I now have a commercial RPC so the question was just massaging my curiosity :coffee:
Thanks for your input, I think I'll leave this one in bed where I left it .... :)
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