Take this motor as an example - https://www.robotshop.com/en/12v-100rpm-583-oz-in-brushed-dc-motor.html

it has torque of 42kg.cm

I know all the calculation to find the payload of dc motor from here - https://www.quora.com/How-do-I-calculate-how-much-weight-can-DC-motor-carry

My main concern is the output power. Power formula is:-

power = voltage x Stall Current = 12 x 2A = 24W

But the specification says that the power is 5W. Which value should I use in my calculation?

  • Do the same calculation with the rated values. What do you get? – Majenko Dec 25 '18 at 15:30
  • then the value is too low, I want to make a mobile robot whose weight is 5kg. I want to use 2 dc motor for this project. – Sultan Morbiwala Dec 25 '18 at 15:58
  • The stall current tells that the driver should be able to give that current or else the driver will get damaged. The 24W is only a calculation. I assume that the maximum mechanical power will be a few watts less. The 5W power is probably an average for normal operation. Perhaps the motor and gears are not designed to operate a long time near the stall current. Perhaps the motor gets too hot if used for a long time with more than 5W. – Jot Dec 25 '18 at 17:17

With a current rating of 0.68 A at 12 V you get the normal power requirement of 8.6 W for a 7Kg.cm torque.

If, for any reason, you stall the motor, your driver must be capable to output 2.2 A or 26.5 W to avoid a permanent damage.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.