1. "this crazy idea: power the 110V transformer at the 220V main." - yes, that is a crazy idea. The transformer will saturate and blow the mains fuse (if you are lucky) or burn out. A light dimmer is unlikely to work properly on a device like this which has complex electronics in it. – Bruce Abbott.

The first step is to make sure that the three-phase supply line is grounded. This will prevent the power from sagging, which could be hazardous. Before attempting a 3-phase to single-phase 220v conversion, you’ll need to consider how your machine is wired and how the current balance needs to be.
GoHz 150 kVA static frequency converter for converting three phase 460V 60Hz to 415V 50Hz, 400V 50Hz, 420V 50Hz etc. Output voltage is adjustable from 0 - 520V three phase. -When the output is 400Hz, the load capacity can only reach 50% of the rated capacity. -When the output is ≤120Hz, the load capacity can reach 100% of the rated value.
Designed for PLCs, these power supplies attach to your processor to bring your automated system to life. Once connected, they take in the voltage from your facility, convert and regulate it, and send out stabilized power to the rest of your equipment. Choose from our selection of voltage reducers, including DC to DC converters, AC to AC voltage
Explaining Phases. Single-Phase Generators – for smaller single-phase loads, these gensets usually do not go above 40 kW. They are commonly used in residential environments and have a power factor of 1.0. 3-Phase Generators – mainly for larger industrial power generation, these gensets can provide both single and 3-phase power for running
Now the question is, how can I connect the motor to delta connection if I have only 400V line to line voltage? If you have 400 V, use the star connection. There is no reason to use the delta connection and the motor will draw too much current and overheat if you apply 400 volts to a connection designed for 230 V.
2. If you have 3-phase 380 V in delta configuration, you have also 3-phase 220 V in star configuration requiring an additional neutral connector. But if you want 230 V, you need 400 V. Of course you may use 3 phase power transformer, primary in delta, secondary in star. It will be portable for very low power.
HGfl.
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    • how to convert 400v to 220v