[Donut]

Originally Posted by Trent B

Not to mention Banebots puts a max torque spec of 85 lb-ft or 115.2 N-m of torque on their P80 gearboxes.

As for the 2 vs 3 CIM Motors, correct me if I am wrong, but based off of this http://content.vexrobotics.com/docs/...otor-specs.pdf

2 Motors at 300oz-in each will draw about 115 amps a piece. 230 amps total.
3 Motors at 200oz-in each will draw about 75 amps a piece for 225 amps total.

Because the curves are linear, total current draw shouldn't matter on number of motors. However, the motors will be rotating faster on the 3 motor setup at ~2200rpm compared to around ~700rpm because each motor has to put out less torque.

Although this specific example is not advised (75 amps still blows the breakers!) what you're saying is correct. If you drive the same load at the same speed with 2 or 3 motors, then the total power used will be roughly the same. Each motor individually will draw less power in a 3 motor configuration but you still need the same total power to move the load (power = torque * angular velocity, none of which are motor dependent). There will be a slight difference in total power due to where the motors are running in their efficiency curve but I think it would be negligible for most applications.

Adding extra motors can be a benefit if you need more torque than was available with the previous CIM limit, but as Al mentioned you might not have enough power available to power that many CIMs anyway. Additional CIMs don't change how much power you can draw from the battery at one time.