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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
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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.

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