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I guess I should have clarified this is not just a one time use as the transformer would be bolted to new lathes we will be selling. Thus it has to be new while being as physically small and cost effective as possible. MilacronThis one would work. No enclosure, that could be a problem or an advantage, depending if you could fit it in the machine somewhere.
Used Siemens Transformer | HGR Industrial Surplus
For this one- 3-Phase Encapsulated Autotransformer 600-480-400-240-208v – Maddox Industrial Transformer .... I would need 2 ? Why ?Autotransformers will be the smallest since they only need to be sized for a portion of the load, but you will need at least two of them. Three if the machine requires balanced voltages to ground for some reason.
I don't think you need anything. Set the machine up for 400 Volt and connect it directly to 460V. Because the line frequency is 20% higher, so will be the motor reactance (AC resistance), so the motor will not draw an excessive amount of current. The motor speed will also be 20% higher, but a simple pulley change should sort that out. Try it and see, worst case is you'll pop a fuse.....so what.
I guess I should have clarified this is not just a one time use as the transformer would be bolted to new lathes we will be selling. Thus it has to be new while being as physically small and cost effective as possible. Milacron
For this one- 3-Phase Encapsulated Autotransformer 600-480-400-240-208v – Maddox Industrial Transformer .... I would need 2 ? Why ?
If you're manufacturing these machines, why not order the same frame size motors wound for dual-voltage 240/480V service? The cost of special-ordering motors for North American service ready to go from a European manufacturer would probably be considerably less than the material and labor cost of adding transformers, installing disconnects and overcurrent protection, grounding and bonding as necessary, etc. You're talking about a lot of extra time in production. Using the right motors would also be the smallest, most efficient option as well.
If you're not constrained by an IEC frame size, you could even order NEMA motors from the US and have a batch of them freighted over.
Europeans often use 6-lead motors that can be wired in wye for 400V or delta for 230V. Check your motor nameplates - you might be able to convert them to 230V without anything special at all.
That used to be the case, but for a while now most EU machinery is delivered with 380 / 660 motors, as (I was told) factories are running 660V.
I needed a 220 3-phase machine and I had to special order it.
Regarding the original inquiry; If these are new machines, I'd ask the factory to advise on what motor options they can offer.
If they're used machines, I'd look at what motor voltage options are on the motors that come with it, and go from there.
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