I'm trying to retrofit an electric motor (such as this) to a pull cart as depicted below. I got most things figured out except for how to slow down the motor to a pedestrian speed.

Could I slow it down by reducing the amperes? Or must I use a lower gear ratio?

enter image description here

  • $\begingroup$ So did you check out the pedal assist as per your post and the comments here: engineering.stackexchange.com/q/51117/10902 $\endgroup$
    – Solar Mike
    Jun 1, 2022 at 13:55
  • $\begingroup$ And the answer here: engineering.stackexchange.com/a/51115/10902 $\endgroup$
    – Solar Mike
    Jun 1, 2022 at 13:56
  • $\begingroup$ @SolarMike Thank you for reminding me. I missed it but I just replied them. $\endgroup$
    – ratib90486
    Jun 1, 2022 at 14:40
  • $\begingroup$ If you're trying to avoid a gearbox, which is understandable since gearboxes are expensive, you just use a chain drive or a belt. You need to attach a motor to each wheel anyways and it's unlikely that the motor can support the weight of the cart on its own shaft. $\endgroup$
    – DKNguyen
    Jun 1, 2022 at 14:59

1 Answer 1


The specific motor that you linked is a BLDC motor and requires a controller. The multitude of wires coming out is a tell.

This controller will be what will regulate the speed. By turning on and off certain coils in a rythm.

To set the speed to your liking you will need to program the controller to your needs.

  • $\begingroup$ When you said program the controller, how difficult will that be? Is the controller meant to be reprogrammed and comes with a manual for this? I mean are most are? $\endgroup$
    – ratib90486
    Jun 1, 2022 at 14:34
  • 1
    $\begingroup$ depends on the controller you get. Some are very locked off, and some let you rewrite the entire code. $\endgroup$ Jun 1, 2022 at 15:49
  • $\begingroup$ @ratib90486 You will need to buy a brushless motor controller (also known as ESC - electronic speed controller) to use this motor. A brushless motor won't spin if you just plug it into a power source. It needs the electronics. $\endgroup$
    – user253751
    Jun 8, 2022 at 16:27

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