The Shop > Tools
phase convertor
Andrew Wildman:
third project that I completed was my 4kW phase convertor. Originally I had a small static one but with the larger mill it would not cut it. This design wasw based on the info from the workshop practice series 'three phase conversion'.
The step up transformer is a modified cytringan 180A stick welder, that also still serves as my AC stick welder(£30 ebay)
The idler motor is a 4kW unit from ebay (£40). This picture shows it running unloaded, the voltages are better matched with some load:
Gubbins - main contactor, idler thermal trip, driven equipment thermal trip, start capacitors and relay as well as run capacitors:
Works well, runs larger equipment than the static machine does and smaller equipment more smoothly that the old static. At about £120 all in was much cheaper than putting an invertor on all mu machines, although clearly you have no ability to change speed.
rotorhead:
Impressive to say the least, I had to go with what's on offer, ready made wise, as I haven't a clue when it comes to electronics...well done...
Auskart:
Do you have a circuit diagram for it.
Cheers Shane.
Andrew Wildman:
hi shane,
If you are interested in building one it is worth buying the book that I referenced as it gives a lot of other useful info. The circuit diagram can be made up from bits of the book
glumpy:
The couple of things that I have that are 3 phase I just set up individually. That way you can fine tune each machine to get the best performance.
It's just some caps that I start off with some ballpark values for and test from there till I get the best start and run.
Clearly you must have some professional electric education to wire something like your converter up. It's a real beauty and so neatly laid out.
I'd be putting a clear cover on the thing and lying I lost the original one just so I could show off my handy work to my mates and -appear- to be humble about it! :0)
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