Electricals

Hi guys,

I'm trying to setup my 6DOF stewart platform and I am very lost on the electronics side.
I currently have the 80st-m02430 servos with the AASD-15A drivers.
I am in the US, which means I have 110V 15-20A outlets. I was planning on getting an 8000W step-up transformer to run them on 240V, but I still don't know how I would get the necessary 40-60A needed for all 6 motors.
I have very little knowledge on the electrical side of this and am doing lots of research.

Just curious as to what everyone else was doing....

There is no need to use an transformer for your case. You will never reach the max speed with 10mm pitch ballscrews. 5mm Pitch is to slow in any way.

The AASD-15A drivers will run directly on 110VAC. IIRC you have to change a parameter so they don't complain about the low voltage, though. At half the rated voltage you only have half the max. speed (1500 instead of 3000RPM) and half the power. But 110V times 20A is still 2.2kW and that is plenty to run the rig.

But you should select your screw pitch or gear ratio carefully not to demand something from the motors which is outside the available envelope. For example 1500RPM with direct 1:1 drive and 10mm pitch means 250mm/s top speed. If you need more you can use 16 or even 20mm pitch. The motors still have full torque when run on 110V.

The biggest problem might be the inrush current. Consider adding an inrush current limiter or a time relais to delay switching on 3 of the 6 drives.

The max you can get out the standard US outlet is 2,400 watts. You won’t find an 8000w transformer.

If you are running four motors that’s 3000w. Six is 4500w. At 120v four may work six I doubt. I am planning on running 240v 30a circuit rather than 2 120v circuits. Fortunately the rig is a few meters from the electrical box. Cost is $20 for the breaker and another $20 for a ground fault switch.

YMMV: that’s an Eaton breaker in a Challenger box.

E dit: they make 120v 30 amp breakers but they are hard to find. The house wiring is rated for 15 or 20 so you need a dedicated drop anyway.

This is bullshit and often enough proven wrong. Max speed is around 2200-2400rpm with 100-110v.

Thank you for your reply. I have 2 outlets that are 110V 30A (3300W) placed right next to each other conveniently in my basement, which is where i'm planning on running my sim. If I connect 3 motors in parallel to one outlet and 3 to the other, would that be enough? I'm trying to learn more about electricals.. so if I were to run 3 from one outlet and 3 to the other, would I be okay? Dont want to burn the house down.

I currently have SFU1610 ballscrew. So 10mm pitch. And I have 2 outlets that are 110V 30A. I also asked someone else this, but if I connected 3 motors in parallel to one outlet and 3 to the other, could that work? Also Im not sure what an inrush current limiter is but ill look into it, thanks alot.
Edit: I see what inrush current is. I am looking at an NTC inrush limiter rated for 30A and they seem relatively cheap.

Even on one Outlet it will not trigger the breaker. You will never reach the max power with every motor at the same time. Only thing what can change this is an transformer because/related of his Efficiency.