2 x Toroidal transformers question

[m_c]

I got my hands on a high quality Eltek Flatpack2 2KW adjustable 53,5 to 67Vdc handling 30 Amps at 65Vdc, Ripple=150mV PP/2mV psophometric.
Hmmm... Can`t see any reason not to use that one..

Mostly because when decelerating hard, stepper drives dump power back into the power supply.
With a linear supply it (more specifically the capacitor) will absorb the current and it will cause a slight power rise until things stop decelerating, and provided things have enough headroom voltage wise, it won't be an issue.
Whereas with a SMPS, they don't have a big capacitor, so the same deceleration can cause a noticeable power spike. Depending on the SMPS, it may shut down, go into fault, or simply go pop, but the same voltage spike can quite easily cause the stepper drives to go overvoltage and release the magic smoke.
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Off course, you can avoid the issue by implementing reverse current dumps (the gecko drive website used to have a schematic for one), but it's added things to go wrong.