Max load on rc cart depending on motor torque

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SUMMARY

The maximum load capacity of an RC cart powered by two DC motors with a torque range of 3.5-15[Nm] is determined by the motor's stalled torque and wheel dimensions. With a wheel diameter of 100[mm] and axle diameter of 10[mm], the maximum force at the wheel perimeter is calculated to be 300[N]. This force translates to a potential load capacity of approximately 30kg, assuming no slippage occurs. Discrepancies in calculations, such as the 230kg figure, likely stem from misinterpretations of lifting versus pulling forces.

PREREQUISITES
  • Understanding of torque and its application in DC motors
  • Basic knowledge of force calculations in mechanics
  • Familiarity with wheel and axle dynamics
  • Experience with RC vehicle design principles
NEXT STEPS
  • Research "DC motor torque calculations" for accurate load assessments
  • Study "wheel slip and traction" to understand real-world performance
  • Explore "mechanical advantage in gear systems" for optimizing motor output
  • Learn about "RC vehicle weight distribution" for improved stability and performance
USEFUL FOR

RC vehicle enthusiasts, mechanical engineers, hobbyists designing electric carts, and anyone interested in optimizing motor-driven load capacities.

Stevic
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I'm making a rc cart with 4 wheels with rubber tracks on them. Two front wheels are powered by two dc motors 3.5-15[Nm] torque. Torque of 15[Nm] represent stalled torque.
Let's say that friction between wheel axel and body of cart is minimal. Diamter of axle is 10[mm] and the diameter of wheel is 100[mm]. Motor spins at 35-70[rpm] depending on two posible gears (it's a windscreen wiper motor).
What is maximum load it can carry?

I found some calulations that are totally different. One of them says it can carry 230kg unlike the other says only 15kg. I guess calculation of 15kg would be maximum lifting force instead of pulling but I'll let you decide what is correct.

Thank you very much!
 
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Stevic: Force is measured in Newtons (N). The maximum force at your wheel perimeter is 300 N, which occurs at the stalled torque, if the rubber does not slip on the roadway.
 

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