1 Phase to 3 Phase Rotary Converter - 230V to 415V

In this video I show you how I built a 1 phase to 3 phase rotary converter for my workshop. This converter takes a single phase 230v supply and generates a 415v three phase supply. This means that I can run industrial machines such as my lathe in my home workshop.

The converter works by starting a 230v-415v multi voltage 3 phase induction motor in delta using the live and neutal as 2 of the three phases. Start capacitors are connected from the live to the 3rd phase to get the system going.

Once up to speed the motor is switched to star and the neutral is taken to the star point. At this point the motor is generating 2 of the three phases with the other one being supplied by the single phase supply.

There are also a bank of capacitors connected in parallel across the output of the converter to balance the phases.

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Parts used:

Steel angle 40x40x3mm
1mm aluminium steet
50x50x1mm aluminium angle
Casters 50mm
Direct to metal paint
Hardwood Ply 12mm + 18mm
Light Oak Stain

230-415 4KW Induction motor
16a 3 pin plug and socket
32a 5 pin plug and socket
3 core toughflex
5 core SY
Red+white+earth single core
16a type c mcb
4a type c mcb
4 x 4 pole 20a contractor
4 way n/o - n/c timer
motor overload with n/o - n/c aux contact
red,yel,green lamps
4 x voltage + current display unit
2 position switch
Start capacitors 3x100uF connected in parallel = 300 uF which is ~50uF / idler motor HP
Running capacitors: 40uF on phase 2 to 3 and 10uF on phase 1 to 3

Technical Videos that explain the system in more detail:

This is the video that I first watched that proved that the system was possible. Therefore credit goes to RODALCO2007 for the original idea.
   • 230 Volts 1 phase to 400 Volts 3 phas...  

Then there are 2 videos by Galvinizedsankey that go into a lot of detail. These really helped my in the design of this converter.
   • Rotary phase converter - UK - Part 1,...  
   • Rotary phase converter - UK - Part 2.  

If you are looking for wiring diagrams I do not have any, however there is a chap on Ebay uk who sells plans. I did buy a set out of curiosity and his system works in the same way as this one.

Music: Inspire - www.bensound.com

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Disclaimer: This video is meant for educational and entertainment purposes only. It is in no way meant to be a set of instructions and therefore no attempt should be made by any party to recreate what has been seen in this video. Any attempt to do so is done completely at your own risk. Electrical systems are dangerous and should only be worked on by a competent person. Failure to do so could result in serious injury or even death.