i lost my first racing competition because of lesser power motor and in efficient driver circuit.
i worked on it a lot and finally found some solutions.
solution1: use metal geared motor instead of plastic gear (i lost my match because of plastic motors)
and wheel of maximum possible grip.
solution 2: use proper motor driving technique.
solution3: make strong chases with light weight with maximum possible ground clearance.
solution4: use proper battery with less size and more power that works for longer period.
solution5: better to be wireless
i made a prototype of my own racer.this racer can reach 15Km/h
it can carry up to 4kg of load
actually i made it for carrying a robot arm, gun platform and a video camera
- 1000RPM 12V DC motors with Metal Gearbox
- 18000 RPM base motor
- 6mm shaft diameter
- Gearbox diameter 37 mm.
- Motor Diameter 28.5 mm
- Length 63 mm without shaft
- Shaft length 15mm
- 300gm weight
- 12kgcm torque
- No-load current = 800 mA(Max),
- Load current = upto 9.5 A(Max)
the circuit for connecting relays will be as follows.
the following circuit is a high current motor driver using relays.
so that you can control "3" motors with still one left.if you use two ICs you can control "7" motors.
these relays can drive very large currents compared to L293D and L298
i made a perfect robot that will help you in racing..... take a look at it