I disassembled a drone. I want to re-use two of its motors to build a twin-engine RC model plane.

My motors are best for 3.7v, and according to their reference, draw 0.18A-0.20A of current.

What ESCs would I need, current-wise?

It seems like all ESCs on the market are from 6A and up; What am I missing?


closed as off-topic by uint128_t, Voltage Spike, Nick Alexeev Feb 26 '17 at 23:57

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  • \$\begingroup\$ Welcome to EE.SE. Shopping recommendations are off-topic, so your question is in risk of being closed unless you edit and reword it. \$\endgroup\$ – Enric Blanco Feb 25 '17 at 17:29
  • \$\begingroup\$ I hope it's better now. \$\endgroup\$ – Dor Feb 25 '17 at 17:38
  • \$\begingroup\$ I think you have those specs wrong. Not even a mini drone (smaller than a hand) uses such little power. \$\endgroup\$ – Bwinzey Feb 25 '17 at 18:04
  • \$\begingroup\$ Could be. I tried looking up their specs, this is what i found: ebay.com/itm/… \$\endgroup\$ – Dor Feb 25 '17 at 18:52
  • \$\begingroup\$ I suspect those are the "no load" current ratings, with just the shaft spinning and whatever internal friction is in the motor. If you connect it to a propeller in air the RPM will drop slightly and the current draw will go way up. That is, assuming the rating isn't just completely wrong. \$\endgroup\$ – Evan Feb 25 '17 at 19:32

0.18A and 0.2A are the no-load figures. Expect 2~5 times higher operating current depending on prop size, and ~10 times higher stall current.

It seems like all ESCs on the market are from 6A and up; What am I missing?

Here's one rated for 3A:-

HobbyKing 3A Single Cell ESC - Brushed Micro Motors

A 2A ESC would probably be fine, but there's little point producing such a small controller when a higher rating can be achieved at minimal extra cost. A 6A controller should be more robust and efficient, if perhaps a little heavier.

  • \$\begingroup\$ And the motor will only draw "as much as it needs"? There's no danger in putting in even a 10A ESC? \$\endgroup\$ – Dor Feb 26 '17 at 17:33

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