convert 3phase 220v into 3phase 165volt
Those transformers are oversized, 330VA transformers for 300Hz use should be much smaller than that, and you don't need 300 VA transformers if you use autotransformers:







simulate this circuit &ndash; Schematic created using CircuitLab

the autotransformers only need to handle about 100VA and at 300 Hz

at 300hz the transformer core can be 1/6th the mass of a 50Hz transformer
and if you don't need isolation use autotransformers which will in this case give another reduction by a factor of 3

If you can biuld the three transformers on a three phase core that will save some iron too