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Three phase from a Single Phase Supply

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ChrisH	15/11/2009 19:16:46
1023 forum posts 30 photos	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
Niloch	16/11/2009 09:33:31
371 forum posts	Doesn't this thread help?
ChrisH	16/11/2009 10:13:50
1023 forum posts 30 photos	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
KWIL	16/11/2009 10:25:28
3681 forum posts 70 photos	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.
ChrisH	16/11/2009 10:28:04
1023 forum posts 30 photos	Right, Gotcha, clear as a mountain stream now! ChrisH
Niloch	16/11/2009 11:35:19
371 forum posts	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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