How To Choose The Best Motor For Your Drone


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There are several different drone motor to choose from while making your drone. Mostly, brushless motors used for drones have the following advantages over brushed ones. Due to the absence of brushes, wear and tear are very less, thus making them more reliable and durable. High RPM is possible without much heating. They respond more quickly to variations in speed than brushed motors, making them ideal for drones since continuous changes in speed facilitate maneuver of drones. These create less heating and noise. Thus they are more efficient. For similar advantages, coreless motors work best in some lightweight drones.

How To Choose The Best Motor For Your Drone
How To Choose The Best Motor For Your Drone

Best Drone Motor

Coreless motors are brushed motors, with the only difference that the armature does not have steel pole with winding on it. Instead, the winding itself acts as an armature. Thus, they have negligible rotational inertia, thus providing more agility in terms of speed control, which is a must for drones.

Also, steel pole apart, coreless motors are incredibly lightweight, have excellent heat dissipation, and can achieve higher RPM. Controllers for coreless motors are much cheaper and easier to use than brushless motors (same as standard brushed motors). The engine itself is costly, though.

Drones are popular now due to their maneuverability, speed, and range for things like taking photos, and electronics scanning equipment. Our current society has not progressed past the need for cranes, trucks, and other stable vehicles for hauling weight. Once cars start hovering or we start looking at serious space travel, we might see drones and robots implemented more into everyday actions than they are now

When building a drone, it’s your choice to use between brushed motors and brushless motors. As far as my knowledge, most hobbyists use brushless motors. I did build a drone once but using brushed motors (considering its cost and size since I made it for educational purposes)

How To Choose The Best Motor For Your Drone
How To Choose The Best Motor For Your Drone

Advantages Of Brushed Motor Over Brushless

They are lightweight and available cheaper. You also do not need ESCs with brushed motors.

But the problem is they are not big enough to have changeable brushes and commuters due to which they have maintenance problems which you don’t find in case of brushless (more efficient). These are the few things you can consider before buying the one which suits you. Which type of motor you want to use – In-runners or Out-runners. In-runners spin faster, but Out-runners can produce more torque, hence their use.

The size/weight of the motor and its KV rating (KV coupled with supply voltage) decides your motor’s RPM. For faster flying drones, you should expect this ratio to be very high up to 10:1 due to which quad’s performance would much more agile and dynamic, it would accelerate much faster and hover better. But remember high ratio means it might be hard to control because a little increase in throttle is enough to shoot the quad nowhere.

How To Choose The Best Motor For Your Drone
How To Choose The Best Motor For Your Drone

Efficiency: Higher thrust gives you top speed, but that affects productivity. With less ability, you not only wasting a lot of energy (and thus flight time) but also you get little thrust on full throttle. 

Last but not least, remember the inverse law- Higher KV rated motors spin at higher RPM but swung smaller Propellers. Lower KV motors spin at lower RPM but rotate larger Propellers. That’s the reason more massive quads use large props, which mean lower KV motors.

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