Team "ACE" and "DUMBLE" robot builds

[maddox10]

Ampflows are higher KV motors, so gearing is important.

But with the right gearration the A28-400's beat the Bosch 750 over all
, except wear of the brushes.

I have to admit, I don't like the Magmotor/Ampflows. But that's personal.

[overkill]

Looking at the spec sheets of the GPA750 VS the A28-400, the Ampflow motor wins is almost every category:

500 grams lighter
stall current 300 A vs 570 A
Stall Torque 18 Nm vs 26 Nm
no-load RPM 3,900 vs 4,900
Peak power output 1,800 W vs 3,400 W
Peak efficiency 84% vs 83%

As well as the performance specs, the Ampflow has a stronger case and is easier to repair. The A28 motors have dual independent windings, so they can be driven by two smaller & cheaper ESCs, a pair of Botbitz TZ85a controllers might do the job. On the downside, the brushes are a bit fragile but they are easy to replace so consider them as a consumable. As Mario mentioned, they have a higher RPM so you can gear them down more than the GPA motor and get substantially more torque at the same speed.

[overkill]

Fair enough; the A28 range is kinda spendy but you do get a powerful motor for your money.

[Albear]

Nice! any Dumble pics going up?

[daveimi]

Is it OK to ask which motors and gearboxes you use in your robots :-)