STMBL Driver DC Bus Options

I'm hoping to catch the eye of some of the experienced retrofitters here so I can learn some things. I'm in the process of retrofitting a Deckel FP4a with STMBL drives and LinuxCNC, it was originally 3 phase, but I want to run it on single phase 220, but not being an electrical engineer, I'm stumbling on the power supply for the drives.

I know I need to supply my motors with ~210VDC via a capacitor-smoothed DC bus, I'm just trying to find the best, safe option of doing so without breaking the bank, causing a fire, or killing myself and all my equipment, so I need to learn more.

From what I understand I have 3 options:

• An isolation transformer to drop the 220VAC to 150VAC, rectified to ~210VDC, but this needs an odd ~5KVA transformer that is likely very expensive and may be hard to source. I have the original, monstrous 3 phase transformer, but I have my doubts that it would work effectively in a single phase capacity.
• A skookum switch mode power supply that can handle the load of the 3 axis motors (2x 1.5KW, x1 1.75KW) and spindle (1.5KW). This is also likely to be expensive and hard to source.
• Direct rectification of the 220VAC to ~310VDC, very simple, but potentially quite dangerous, though I don't fully understand the risks and potential failure modes.

How are others handling this situation for their machines?


For a little background, the machine came to me free in a broken state, the original drives were questionable and the controller was non-functional, the machine is physically in great shape. I chose the STMBL drives because they can handle the resolvers in the stock Industrial Drives brushless axis motors and spindle motor, I couldn't find a decent, off-the-shelf drive that was cost competitive and they seemed like the ideal solution, provided I can power them.

Why do you need 210 VDC?

Normally you would use rectified 220V for the DC bus to run for 220V  motors

Are the motors 150 VAC?