We have a robot which is a four wheel drive… Motors are directly attached to all the four wheels. The motors have been modified to high speed gearing. The motors get cut off after just 30 seconds of run. We have figured out that it is the thermal breaker inside the motor which is kicking off. Already have tried external 3:1 gear ratio but still had the same problem. Is there a way to increase the speed of the robot??
Lift : Four 393 Motors, Geared for torque
Intake : Two 269 Motors
Base : Four high speed 393 motors
The speed is what is tripping your motors. They don’t have enough torque to make the robot move, so your motors just receive current trying to spin but don’t go anywhere. The result is that your motors overheat. Try using high strength and then gearing up for speed as able.
We have played all our competitions now with high strength gears but then the robot is very slow… Once we switched to high strength gears and then used an external 3:1 ratio, still same problem. What gear ratio do u think we should use?
Have you put bearings on? Friction can cause motors to overheat very quickly so it’s best to reduce as much friction as you can. I would also try a lower gear ratio for speed, 3:1 seems a little too high.
If your robot is already at a 1.6:1 drive with 4 motors and stalling, I suggest you try to lighten your robot, or take two motors from your lift and add them to the drivetrain. Otherwise, slow it down to 1:1. Better to have a slow reliable robot than a fast one that doesn’t last.
Our robot is 18x18x12. Perfectly fits. We have used lot of latex tubing on the lift. We have decided to take two wheels of the lift and change the lift gear ratio to 1:7. How do u think is it possible to distribute 393 motors among two front and two back wheels?
I’m going to give you the same advice I did earlier; Build a six bar. There’s just too much metal on your lift. Cutting it out is the easiest solution to your problem. The 10 bar is entirely unnecessary; unless this robot has a ton of features we’re missing that are contingent upon the height, you will never need more than a 6-bar for this game. In the case you needed the height, you should have a scissor lift because it’s less metal.
If, however, you’re set on powering a 10 bar arm on 2 motors (which prevents you from hanging), then I guess I would recommend chaining all of your wheels together using the 6 tooth sprockets. That’s the best way to put 6 motors on a 4 wheel drive.
You seem to have tried a lot of what we’ve told you. Are you willing to share pictures to see if you aren’t missing anything? Four high strength 393 motors should be able to move almost every robot imaginable, perhaps slowly, but almost certainly without burning out within 30 sec… I would bet that the answer is the same: cut weight or gear up for torque and sacrifice speed.
Another thing, where do you have your drive motors plugged into on the cortex? What ports?