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Single phase to three phase sinewave converter

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CatalinaWOW:
Doing both frequencies will require either a compromise, or switches.  If you tune your filters for 55 you will have a few degrees of phase error at both frequencies. Only you can say if that is OK.  Similarly you have to understand your application to know if this simple approach will work

soldar:

--- Quote from: TimFox on January 13, 2019, 02:13:21 am --- Google “Scott-T Transformer”.
--- End quote ---
I googled and found
--- Quote ---https://en.wikipedia.org/wiki/Scott-T_transformer

A Scott-T transformer (also called a Scott connection) is a type of circuit used to produce two-phase electric power ( 2 φ, 90 degree phase rotation) from a three-phase ( 3 φ, 120 degree phase rotation) source, or vice versa. The Scott connection evenly distributes a balanced load between the phases of the source. The Scott three-phase transformer was invented by a Westinghouse engineer Charles F. Scott in the late 1890s to bypass Thomas Edison's more expensive rotary converter and thereby permit two-phase generator plants to drive three-phase motors.

At the time of the invention, two-phase motor loads also existed and the Scott connection allowed connecting them to newer three-phase supplies with the currents equal on the three phases.
--- End quote ---
Since the 1890s are long gone and two-phase systems have not existed since then and, in any case, the OP has only a single phase, I cannot see how this could be used in a solution.

soldar:
One way to generate three phases equally spaced 120º apart is to use a divide by 12 counter and use logic gates to switch the outputs. I have not used this technique for three phase generators but I have used it for single phase variable frequency.  By using counter/divider logic the phase will always be perfect no matter what the frequency.

capt bullshot:
http://wunderkis.de/pwramp3/index.html
scroll down to "Input related stuff" - all analog.

station240:
I built this circuit to trick a machine with 3 phase input into thinking it was connected to 3 phase, when only 1 phase was available.
Does work for that purpose, uses the phase shifting ability of capacitors.
https://www.homemade-circuits.com/2013/09/three-phase-signal-generator-circuit.html

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