Specs:
Geared for 20.22 ft/s (adjusted)
3.5" vex colson wheel
2 775 pros per pod (4 pods in total)
I plan on using a bag motor with a versa planetary for the rotation of each pod.
Dear god rest in peace PDB slots.
That said, why 2 per pod? It seems most of the swerve bots this year (That were successful) only ran 1.
Very cool design though!
Thanks Nosh,
The reason I did 2 per pod was because I was looking at making it so it drives at around 20 ft/s and I wanted to make sure I did not go over the stall current per motor. If I used 1, I would stall the motors with my current gearing. So the only other option would have been to change the gearing but I also wanted to a safety factor just in case.
Plus I am just designing this for fun (not building it), and I was not looking on adding any extra mechanisms.
Paulius Pace
Team 3161
If you run half of stall current (peak current), each motor will only last half a match. Even at 40A average, the motor is likely to die during a match. You really ought to consider more safety factor…
In what situation are you going to be drawing half stall current continuously for a minute in a drivetrain?
To add to that. 2767 runs 4x 775 on their swerve drive, caps their motors at 50A, and hasn’t burned a motor all season.
It may well be adequate for their use case. My point was that “I can break the stall” is not enough to keep it from burning up. This is true of all FRC motors, but especially the fan-cooled ones.
In the interest of full disclosure, we burned one and wounded a couple before getting wise about the current limit value. No damage after that. All failures have been related to brushes.
FWIW, technically even the 40A snap action breakers aren’t enough to stop a 775pro from smoking itself. Talon current limiting is probably a better option due to faster response times, but it’s something to keep in mind regardless.