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I've been planning to make an electric skateboard for a while now. All the tutorials that I have seen use brushless motors. However, where I live, its not possible to get the exact ones as shown in those tutorials.

The ones I can buy are somewhat like this.

The one shown in the tutorials is this.

I am new to brushless motors. The one in the tutorial in 270kv and the one I can buy is 1000kv (and above) but they both differ greatly in size. Plus there's this "outrunner" thing. The ones I can buy seem to be made for quadcopters and similar stuff.

So am I okay using the ones I can buy? The little 1000 kv ones, considering the fact that they need to run a 14T to 36T pulley system with approx 70kgs of weight on the board.

Or maybe I could just use the 12v 10Amp 1000RPM DC Motor that I have lying around?

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2 Answers 2

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Check the legal requirements of the motors for your area.

The little 1000kV motors wouldn't have sufficient torque...

Look for anything below 600kV and the motor should be equal to or under the legal limit of the motor wattage.

Just to let you know...

kV means RPM per volt

The 'k' is the constant The 'V' is the volts

So...

1000 kV means 1000 RPM per volt

Normally, higher kV motors have less torque and they are mainly used for small multicopters

Higher kV would have a lower top speed and much higher torque and they can be used for larger multicopter or projects like electric long board or e-bikes.

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  • $\begingroup$ What about using a dc motor only? $\endgroup$
    – YaddyVirus
    Commented May 30, 2017 at 17:58
  • $\begingroup$ @YaddyVirus I'm not completely sure what you mean, the motors that we are talking about are DC but they all have different specifications and only fit certain needs... $\endgroup$
    – SidS
    Commented May 30, 2017 at 18:15
  • $\begingroup$ I mean brushed DC motors like this one amazon.in/Johnson-geared-Specially-Robowar-competitions/dp/… $\endgroup$
    – YaddyVirus
    Commented May 31, 2017 at 19:23
  • $\begingroup$ @YaddyVirus you could use brushed motors but they require brushed ESCs and they tend to last not that long... The motor that you've linked is not powerful enough, if you look at the torque it's 10kg/cm which means it will output 10kg of force for every centimetre of rotation which is hardly anything compared to the weight of a person and the skateboard. $\endgroup$
    – SidS
    Commented May 31, 2017 at 21:57
  • $\begingroup$ No, I'll be using the motor with a gear assembly to increase torque. The gear assembly will have a ratio of approx 3:1 $\endgroup$
    – YaddyVirus
    Commented Jun 1, 2017 at 22:36
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The 1000kv motor will probably not have enough torque, and the 10A motor will drain your battery (I am assuming you will be running on a battery) way too fast. The motors you want are a lower kv that might not spin as fast, but will have enough starting torque to get you moving from a standstill.

Here is some good information on the types of motors you are talking about that might help you out. It applies to quadcopters but will help you understand the basics about motors and what their values and capabilities are.

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  • $\begingroup$ Torque was also my main concern for the 1000kv motor. Thanks for the link though. I'll read it and get back to you $\endgroup$
    – YaddyVirus
    Commented May 29, 2017 at 19:31

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