Banebots RS775-12 and 775-18

[Ether]

Originally Posted by Grim Tuesday

which motor is attached to the PG71 and PG188 gearboxes sold by Andymark? Is it a RS775-18 being run at 12 v?

Banebots M7-RS775-18 at 12 volts Stall Current: 87 amps.

Banebots M7-RS775-12 at 12 volts Stall Current: 30 amps.

AndyMark 9015 Motor (am-0912) at 12 volts Stall Current: 63.8 amps


The motor stall current @ 12 volts is the same regardless of what gearbox it may be attached to.

[Grim Tuesday]

Originally Posted by Ether

Banebots M7-RS775-18 at 12 volts Stall Current: 87 amps.

Banebots M7-RS775-12 at 12 volts Stall Current: 30 amps.

AndyMark 9015 Motor (am-0912) at 12 volts Stall Current: 63.8 amps


The motor stall current @ 12 volts is the same regardless of what gearbox it may be attached to.

I spoke with Andymark and they put up the statistics for the motor inside the PG71 Gearmotor. Looking at them, they are rather puzzling:

PG71 Gearmotor Stall Current: 22 amps


RS775-5 Motor For PG71 or PG188 Gearbox (am-2161) stall current: 15.1 amps


If the Banebots RS775-5 is truly the motor inside the PG27,71,188 series gearmotors how can they have different stall currents? Either the numbers are wrong (likely the 775-5 as the gearmotor combo was empirically tested) or there is actually a different motor in the PG71 gearmotors.

For more info on why I'm asking, see the link to the Red Raptor in my stat; it's the wrist joint.

[Ether]

The numbers for the am-2161 appear to be self-contradictory. The 174 max watts number is inconsistent with 5700 free rpm and 35 oz-in stall torque numbers.

Assuming a linear speed vs torque curve, the max power would be (5700/2)*(35/2)/12/16*0.14198 ≈ 37 watts. So something's not right.

And that 37 watts number can't be right either, because if you run that thru a 71:1 gearbox you're not going to get 44 watts output (as spec'd for the am-0914).