Electronic – convert 3phase 220v into 3phase 165volt

voltagevoltage divider

I use a frequency converter which has an input of ONE phase 240 volt, 50hz.
This device gives me output from 200-240volt, 0-500hz and THREE phase.

The spindle motor I have needs input of 165 volt, up to 300hz.
This motor is connected in Y-format.enter image description here

I did make three tranformers and connected them in Y-format. It worked but not good enough and it is very very heavy![enter image description here]2

Can you help me to solv this challange in an easier way? (Maybe without using tranformers)

This will be use in Norway (240v/50hz is standard).

Best Answer

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:

schematic

simulate this circuit – 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

enter image description here

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