What Components Do I Need to Build a 200 lb Capacity DC Motor Cart?

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SUMMARY

To build a 200 lb capacity DC motor cart, a 1/2 hp, 12VDC wheelchair motor is recommended for optimal performance. This motor features dual field coils that can be configured for either increased torque or speed, making it versatile for the desired walking pace of 2-3 mph. Sprockets and a chain drive system are essential for connecting the motor to the cart's wheels. Sourcing these components from surplus suppliers can significantly reduce costs, as retail prices can reach $300 per motor.

PREREQUISITES
  • Understanding of DC motor specifications, particularly 12VDC and 1/2 hp ratings.
  • Familiarity with chain and sprocket systems for power transmission.
  • Knowledge of basic electrical wiring for configuring motor field coils.
  • Experience with sourcing surplus mechanical components.
NEXT STEPS
  • Research the specifications and performance of wheelchair motors suitable for cart applications.
  • Learn about chain and sprocket gear ratios to achieve desired speed and torque.
  • Investigate battery options that provide sufficient runtime for the cart's intended use.
  • Explore throttle control mechanisms compatible with DC motors.
USEFUL FOR

This discussion is beneficial for hobbyists, engineers, and DIY enthusiasts interested in building electric carts or similar vehicles, particularly those focusing on weight capacity and speed control.

RonB
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Newbee here, hope this is the place for this kind of question.

I want to fab a cart that will carry about 200 lbs. It will be something I will stand behind, holding like a handlebar at waist height with a throttle. Gearing (chain and sprocket is what I'm thinking) would need to give a top speed of a walking pace (2-3 mph) as a constant speed. Also need several hours of use before recharging.

I believe something like a scooter motor, battery, throttle, etc. is what I need but not sure what watt dc motor, sprockets, would be required to handle that weight, speed.

Thanks
RonB
 
Engineering news on Phys.org
Welcome to PF, Ron.
The easiest solution would be to visit a wheelchair supply company. I have 3 wheelchair motors that are 1/2 hp, 12VDC, with 2 sets of field coils that can be wired in either parallel or series for more torque or more speed. The outputs are worm drive to chain sprocket. Check into surplus places, though; these things cost about $300 each retail. I got them for $10 each from a guy who didn't want them any more.
 

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