Three phase from a Single Phase Supply

[ChrisHParticipant @chrish]

Daft question – so please don’t shout too loud, but if a three phase motor is being fed from a single phase supply via an inverter will the motor give the same power as if it were still on a three phase supply or are there losses in the conversion that will reduce the power?

 

Also, I have read somewhere that when using a single to three phase inverter the motor is better connected in delta than in star.  Is this right?

 

Any comments on this please?

 

Chris 

 

[ChrisHParticipant @chrish]

[NilochParticipant @niloch]

Doesn’t this thread help?

[ChrisHParticipant @chrish]

Yes Niloch, it certainly does help, thanks for the direction to look.

 

However, there always has to be a ‘but’ or a ‘however’, although it confirms my thought that the motor has to be rewired from star to delta and I not sure why it has to be wired.  If you, or anyone else, has an answer to this it would be most appreciated.

 

ChrisH 

[KWILParticipant @kwil]

Rewire is necessary because the star setup requires 415 Vac 3 ph and the delta setup requires 220Vac 3 phase which is all you get from a sensible inverter.

[ChrisHParticipant @chrish]

Right, Gotcha, clear as a mountain stream now!

 

ChrisH 

[NilochParticipant @niloch]

One further reference ChrisH that might be of additional assistance.  See issue 154 of MEW, a lengthy article by Ken Willson: Harrison M300 – Conversion to Inverter Power Source (pages 21-25).  This issue will be in the digital archive.

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