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I have used some Sanyo servos and if memory serves me this is the actual rating the drive read when it tested the windings on auto tune. The drive sent a pulse of electricity to the motor analyzed...

"Before going out and buying a 48VDC power supply and PWM specifically for the 400W spindle, should I be able to use one of the 1.5KW china VFDs with it? "

No this 48 VDC 400 Watt motor will not...

I tried it on a Core II Duo Laptop with 4 Gig ram and 512 Video Card. It ran ok but I couldn't do much larger than a 3"x5" .125" deep or so w/o bottoming out memory and crashing Bobcad with mem alloc...

I have set up several Vexta 5 phase. They are just like any other stepper except the wiring between the motor and amp.

1st software
What you need is to get Mach 3 or LinuxCNC to control the...

I cut similar stuff. plastic wood etc.
Even 3/4" 6065 Aluminum for a stepper motor mount.

I have been using an 800W air cooled motor from ugracnc.com with a Control Techniques Commander SK VFD...

Just to clarify things. The 1st motor you show is a DC motor and requires only DC to run. you could hook it up to any DC supply under 48 volts and it will spin. 48VDC = 100% 24VDC =50% 12VDC=25%RPM...

Also look at your motor to shaft couplers and make sure there are no slippage. I hunted for a bit to find slippage once. It was undetectable to the eye or even by marking on the shaft but once I took...