3 Phase 220 to 3 Phase 440

[Anthony Spotorno]

I currently have a Phase Perfect 20HP unit to drive all of my 3ph ~ 220v tools. As a 1 man shop, I only run 1 tool + dust collecto.

I am looking at acquiring a Martin Shaper that only offers 3ph ~ 440v on their 7.5HP motor... (I can downgrade to their 5.5hp motor, but would rather have the 7.5)

Is there a way to convert from 3ph ~ 220v to 3ph ~ 440v?

Thanks.

[David Kumm]

Three phase transformer or two ( or three ) single phase step up transformers. Delta to wye isolation is first choice, delta to delta autotransformer is second choice. Dave

[Anthony Spotorno]

IC, so something like a Grainger (Acme Electric) 4WUE6 - 240VAC Delta to 480VAC Wye would work? That transformer is about 2300.00... Just want to make sure before I decide on the shaper, how much more it would cost to have the power issue solved.

[Rod Sheridan]

Anthony, what is the rated full load current of the motor?

The transformer you selected is 15KVA, depending upon the motor nameplate rating I might select a 9KVA transformer.........Rod.

[Anthony Spotorno]

According to Martin the T12 shaper has a 7.5KVA (10HP) option. I'll look at other manuf to see if I can locate a 9KVA unit, might save some on the price.

[J.R. Rutter]

Also, searching used equipment dealers often turns up transformers for a lot less money. I have a 208 to 440 that feeds a sub panel so that multiple machines can be wired up.

[Darcy Warner]

Unless I am desperate, I will never buy a new transformer.

[Jeff Heath]

Second that^^^^ Plenty of good quality used transformers for under $500. The size transformer you need is a very common size, which means they are found surplus, all over the place.

[Chris Hachet]

Unless I am desperate, I will never buy a new transformer.

Again, lots of used stuff available.

[Bill Dufour]

used motor probably no more cost then used transformer of same horsepower.
Bill D.

[Chris Hachet]

used motor probably no more cost then used transformer of same horsepower.
Bill D.

Not to mention a ton simpler.

[David Kumm]

Good luck finding a metric large frame 7.5 hp motor with a shaft long enough to hold multiple sheaves. Probably cheaper to rewind but then you also have to redo the electronics. A used transformer should be under 500. the problem is always finding one close enough that the shipping doesn't kill you. Freight is cheaper now than a year ago so that helps a little. Dave

[Rod Sheridan]

Not to mention a ton simpler.

Except for changing the switches, starter and all the wiring

[J.R. Rutter]

used motor probably no more cost then used transformer of same horsepower.
Bill D.

On a Martin? I think I would rather do the transformer. Dead simple to wire, just expensive to ship.

[Philip Hine]

Another possibility would be to get a dual voltage motor. If the motor that comes on the machine is a 9 lead motor it can be configured for the lower voltage.

Phil