Power Supply Basics - Question

Hi list,

Hooking up G201s to SanyoDenki 103 H 8221 � 5141
Motor specs Vdc = 2.4, Phase current 4 amps

Per Gecko white paper, 25 times voltage = 60 Vdc, hence divide by 1.414 => 42 Vac

Current is 1/3 per motor (4 wire, bipolar), so for 3 motors PS output needs 4 amps

If 4 axis, then 4 motors => 5.3amps

Hope above logic is correct, if not please highlight errors!

Have been looking around for 42Vac output, and best i can find is a 230Vac transformer with 2 independent secondaries, both rated at 20 Vac @ 2.5 amps ( part no RS 805-300 ). Can i hook these up in series to get 40Vac @ 5 amps?
If so, will there be any issues with using just 3 motors (the 4th may not be connected up until i can get my head around how to design the fourth axis economically!)

TIA
John