how does 3 phase transformer work

[[email protected]]

I need to convert square wave, 400hz, 24VAC to 115VAC three phase. I am
wondering if its possible to use a 3 phase transformer "in reverse"
(not backwards) to convert 24V input to 115V output? If so, how does
this work? I understand single phase, but how does a three phase
transformer generate three phases output from a single phase input? Are
the windings located in some fashion which creates a phase shift?

And it would be great if someone sold these off the shelf. My power
requirement is about 50W. Would it be feasible to make my own somehow?

Thanks!

 

[Phil Allison]

<[email protected]

I need to convert square wave, 400hz, 24VAC to 115VAC three phase. I am
wondering if its possible to use a 3 phase transformer "in reverse"
(not backwards) to convert 24V input to 115V output? If so, how does
this work?

I understand single phase, but how does a three phase
transformer generate three phases output from a single phase input?

** Err - it doesn't.

A 3-phase transformer is one that operates with three phases in and out.

And it would be be great if someone sold these off the shelf. My power
requirement is about 50W. Would it be feasible to make my own somehow?

** If your only available power supply is 24 volts at 400 Hz ( aircraft ? )
then it is no simple ask.



........... Phil

 

[Frithiof Andreas Jensen]

And it would be great if someone sold these off the shelf. My power
requirement is about 50W. Would it be feasible to make my own somehow?

50W is Easy - assuming 50W in total and not per phase - and since nobody
makes 400 Hz stuff, there might even be a (niche) market for it.

You can f.ex. use an analogue three-stage ring oscillator to generate the
three-phase system and three audio amplifiers to generate the outputs. It is
also possible to do it digitally. If the loading of each phase is asymetric,
you might need to control the output voltage on each of the phases
individually via a feedback loop.

You do not have to use a three-phase transformer; three single-phase units
connected in "star" connection will work equally well. Single-phase is
easier to get hold of.

I should draw this.