Linear Electromechanical Actuator Design

You will get your best answer from the manufacturer of these two stages.

I believe that the difference is if the nut or the screw is directly attached to the motor. Now why this makes a performance difference can only be answered by knowing exactly the kinematic design between these two stages.

Alborz, the rotating nut or rotating shaft type will both have the same speed for a given pitch. The rotating nut type is not faster by design. It's simply that it can achieve higher speeds for long travel distances since you're not rotating a long shaft at high speed (vibration at high speed, slower acceleration). Your inertia is greatly reduced since you're only rotating a compact nut. You can find lots of info through companies like SKF, HIWIN, Nook, and Joyce Daton, to name a few.

Thank you

We have both designs here. The rotating nut design works well on long travel because of the nut having less rotating mass, and with a longer travel, the rotating screw type tends to get a whip action going leading to poor quality and premature failure. Both designs work well but you can achieve greater speeds and higher accuracy over longer distances with the rotating nut design.