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Vevor no, but maybe, usually not isolated.
The 1000VA looks good, has outputs that can be paralleled giving 8.7A and can handle quite some beating, so get 1 of those, it will be more than enough for testing and running individual motors. After you do that, you can try using 2 or more motors with it and see how it behaves, you might just get away with 2 or 3 of those if no fast acceleration is needed.
Kuka does not makes drives, Siemens does/did, although that looks like something Beckhoff would make, so try finding more info on them. Also notice Kuka used fieldbus and profibus for comms...

is it possible to drive kuka drivers or not, they are completely blocked by kuka?

 

a pity about auto transformers, because there are plenty of them for sale, and they're high-powered.

I'll turn to this:



is it insulated?



moreover, i found in my garage two insulated 400/240 - 110V transformers with a power of 1000VA with two 110V 2x4.26A outputs and can up to 5000VA for short time

 

so I'll go with

transformer 1000 VA : - motor 0.57 kw 1.6A 143V
                                - motor 0.57 KW 1.6A 143V

 transformer 1000 VA: -motor 0.57 KW 1.6A 143V
                                -motor 1.5 KW 3.7A 146V

transformer 3000 VA :- motor 2.5KW 5.4A 185V
                                -motor 2.5KW 5.4A 185V

does this sound right or is the 3KVA transformer too small?