Dear frnds,

i have a doubt that ,can we change over the three phase motor supply into single phase motor supply directly??

 

Use two phases, if the voltage matches the motor.
Max.

 

Use two phases, if the voltage matches the motor.
Max.

I don't understand. Wouldn't you use just one phase to drive a single-phase motor?

 

I don't understand. Wouldn't you use just one phase to drive a single-phase motor?

Across two phases IS single phase. At least that is what I intended to mean.
Unless you also have 3 phase and star connected transformer source.
If you have, you have two 1ph voltage sources of a different voltage value where either could be compatible with the motor.
Max.

 

Hello,

You can use a capacitor and make a steinmetz circuit:
http://boesche.com/partners/AEG/application_capacitors_aeg.htm

Bertus

 

Hello,

You can use a capacitor and make a steinmetz circuit:
http://boesche.com/partners/AEG/application_capacitors_aeg.htm

Bertus

Presumably the 1ph motor would already have the split phase caps in place?
At least the way I understood the OP, he wanted to run a 1ph motor on a 3ph supply?
Max.

 

Across two phases IS single phase. At least that is what I intended to mean.
........................

Okay, I understand. Of course across any two of wires of the 3-wire 3-phase connection would give a single phase. When you said use two phases I was thinking something else.

 

You can use a capacitor and make a steinmetz circuit:
http://boesche.com/partners/AEG/application_capacitors_aeg.htm

I think he wants to go from a 3-phase supply to a single-phase motor, not vice versa.

 

I hope this helps !

 

Basically what has been said, Although it does not show the phase to star neutral option.
Max.