For an experiment I need to use an electric motor, unfortunately I'm not an expert of electric machines. The electric motor I need has to comply with some requests:

  1. It must be brushless.
  2. It has always to turn at low speed, from 0 to max 6 rad/s.
  3. Its width can't exceed 2cm and its diameter can't exceed 11cm.
  4. It is energized by a battery.
  5. It has to develop a quite intense torque.

So I'd like to know which type of electric motor meets these requests (if any).

  • $\begingroup$ Gear it down. That will solve both 2 and 5. $\endgroup$ Commented Sep 10, 2017 at 14:45
  • $\begingroup$ @ratchetfreak I can't do it due to the position in which the motor has to stay $\endgroup$
    – Landau
    Commented Sep 10, 2017 at 16:14
  • $\begingroup$ 11x11x2 cm is quite a lot of space to gear down a small motor $\endgroup$ Commented Sep 10, 2017 at 16:28
  • $\begingroup$ Might be good tell us about the type of brushless motor you are currently considering. Also it would be if you can define intense Torque. What desired battery specification. Currently the question is too broad, and might not be able to be answered in this forum. $\endgroup$ Commented Sep 10, 2017 at 18:57
  • 1
    $\begingroup$ @Landau I believe the type of motor you're looking for is stepper motor. It's brushless, it can rotate at low speed, it can be powered by a battery, and it has one with 11 cm diameter, it's called NEMA 42 size. However, 2 cm length is not common, I'm not really sure you can find such a thin motor if you're not asking for it to be custom made.. And the torque, it will be far lower than your expectation. The largest NEMA 42 stepper motor that I know has about 40 nm torque, it's length is 23 cm. $\endgroup$
    – JohnDoe
    Commented Sep 11, 2017 at 21:05

1 Answer 1


Here are some source for you investing with regard to Brushless motors. Take look at the Hobby Robotic Motor Vendor. For the most part they a good source to visualize possible solution. Also it might be best to narrow down a target supply voltage and possible battery options.

High Volume Vendors

Hobby Robotic Motor Vendors

Hope these resource will help you get started.


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