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single phase to 3phase transformer

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yhud

New Member
hello,
any one can help me or can give me schematic diagram of a transformer single phase input and the output is 3phase. pls help me
 

Diver300

Well-Known Member
Most Helpful Member
You can't get 3 phase out of a transformer that runs on single phase.

3 phase converters can run on single phase. Google "variable frequency drives" for how they work. They can be run at a fixed frequency if you want.
 

tcmtech

Banned
Most Helpful Member
What do you need 3 phase power for and how much do you need?
Turning a standard 3 phase motor into a single to three phase converter is fairly easy.
 

Styx

Active Member
What exactly are you trying todo

single-phase -> 3-phase will require an inverter
 

Sceadwian

Banned
I've heard people create rigs that drive a single phase AC motor coupled directly to a 3 phase motor shaft then you draw your 3 phase off the motor terminals. It's not the most efficient thing in the world but it works if you absolutely need 3 phase, and don't want to buy an inverter.
 

Diver300

Well-Known Member
Most Helpful Member
I've heard people create rigs that drive a single phase AC motor coupled directly to a 3 phase motor shaft then you draw your 3 phase off the motor terminals. It's not the most efficient thing in the world but it works if you absolutely need 3 phase, and don't want to buy an inverter.
It is also possible to use just a 3 phase motor. Connect two of the phases to Line and Neutral. A capacitor will be needed to the third phase to get it started. The voltage on the 3 motor terminals will be 3 phase, with no neutral.
 

RODALCO

Well-Known Member
As Diver300 and sceadwian already say.
Use a 3 phase motor on single phase supply.
About 55 uF per kWh for starting.
When motor is up to speed disconnect capacitor via switch or timed relay.
 

Sceadwian

Banned
The 3 phases are going to be more balanced on a directly coupled motor as opposed to simple trying to use a 3 phase motor and tap the extra winding for the third phase with a capacitive start. You're going to get inter coil currents using the 3phase motor alone.
 
Last edited:

tony ennis

New Member
Get a VFD. In addition to 3-phase power, Even modest VFDs offer a plethora of cool features. For example, you can select how fast your motor spins up - and down. You can have the motor stop rotating in a second (or less) if you wish. e-stop is build in, you get variable speed, etc.
 
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