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Shrey Fadia
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 · AhmedabadIndia
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Accurate Motor for Wheelchair?

Hello, teammates!
I have been in search of accurate motors that can be compatible with Arduino and can withstand the person weight. Can anyone suggest me which motor shall I be using?
Thank you!

Arduino
Mechatronics
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Émile Blais-Villiard

Good knowledge!

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Student, Programmer
 · MontréalCanada
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The term “planetary” refers to the gearbox attached to the motor’s shaft. It’s a standard DC motor that can be driven with a DC motor driver of corresponding voltage and that can witstand the current draw of the motor. The planetary gearbox allows for very high torque to be built up while keeping the output shaft perfectly centered with the motor’s shaft. I believe that having all gears co-centric and alligned as such also allows for lower vibration.

The main drawback of planetary gearboxes is how many moving pieces they have, since the gears are actively moving and they’re not attached to individual shafts. This makes fixing them a real puzzle. For pushing a wheelchair, I believe it will need a pretty high torque too, so looking into metal gears is pretty much the only way to go.

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Shrey Fadia
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 · AhmedabadIndia
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Émile Blais-Villiard Nice explanation! Can you tell me whether it would be compatible with Arduino? Or do I need to switch to some other controller? As Arduino is easy and widely used, I was looking for compatible motors.
Can Planetary motor be compatible with Arduino?

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Student, Programmer
 · MontréalCanada
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Yes of course they will be compatible with Arduino. All you need is a motor driver (H bridge) that can take the voltage and current requiered by the motor(s) and that can work at your arduino board’s logic voltage. Of course you cannot hook up the motor(s) directly to the arduino board, you need a motor driver in the middle, so really, you should look into finding a compatible motor driver after the arduino board and motors have been selected, this way you’ll know what specs to look for.

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Shrey Fadia
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Yes, I know that I will need a motor driver and I have already used it in the prototype. But, I hope that H-Bridge motor driver works with Planetary motor too. I need to find the price of it. Do you know which planetary motor would be compatible or can you send me the link? It would be a great help.

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Student, Programmer
 · MontréalCanada
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Planetary motors are just gearmotors with different types of gears. So it all depends on what torque and output rpm you need. Also since the motors will be fixed, standard gearmotors might be a better option, since planetary gear motors are mostly used for when the motor itself might rotate and you need the output shaft to stay cocentric with its position.

So all you need to do is determine how much weigth you need to push and your wheels’ diameters. After that you’ll be able to know what’s the minimum torque you need. The wheel diameter is to calculate the leverage distance you have, since torque is usually a measure of mass/lenght. For exemple: kg/cm. So the larger the wheels, the more torque you’ll need since the lever “arm” will be longer.

After you’ve determined the motor’s specs you need, search online stores like ebay or if you have a local hobby shop or one that ships to your location it’s worth trying. You might also find something on large manufacturer websites such as Digikey.com. Then just search for “gearmotor” and find the ones that correspond to what you need.

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Josh Pinkley
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 · FredericktownU.S.
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You can find a lot of information that could be helpful looking at some of the different Arduino Segway builds.

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