I'm an engineering student and I study at an engineering college. Our college has technical festivals. I took part in one last year, I built a robot using 4 dc motors (300 rpm and high torque) and I lost. My opponent has the same motors but she has a better design so I want to increase my motors torque. Could you please advise me - how do I increase the torque of my motors.
You want to find the point where torque and RPM has the highest mechanical power and efficiency. Do this by measuring current vs. torque and speed vs torque.
Using an adjustable torque load such as a small particle brake coupled to the motor shaft, increase the torque load to the motor just to the point where
stall occurs. At stall, measure the torque from the brake and the motor current.
Construct a table of the motor mechanical power at various points from no-load to stall torque. Mechanical power output is the product of torque and speed.
You can plot the measurements and calculated values
Using the Torque
On the robot the motor is geared down to a usable speed. You want the gear ratio set to give you the optimal mechanical power and efficiency where and when it is needed.
You did not mention the criteria for winning or losing making it difficult to go further.