If you are new to our how to build a drone series then the first task for you is to read: How to build a Drone: Part 1 where we discussed how to build the frame of your quadcopter. Today’s part 2 is more important than any other parts of this total series because this part will finalize that whether you will continue the how to build a drone series or not. Things get a bit tricky from now but trust us, if you can do whatever we suggest, you will definitely be able to build a drone on your own. Now that we are done with the ‘pre-talk’, it is time to get into the action.
How to Build a Drone: The Motors
Without having any idea about anything related to building drones, you can easily assume that motors are probably the most important part of a drone. Why is motor that important? The reason is because the motor will increase the flying time and carrying capability of the drone that you are making. This is the powerhouse of your flying machine and that is why, the motor is considered as the core of a drone or quadcopter. Each motor that you will find in market is different than the other. You will see that even though the stats are same for all of them, the actual result is different. Do not worry because later on we will be using something called flight controller which will take care of that situation.
For our quadcopter, we can select two types of motors. You can actually go for any of these types for this project. The types are known as:
- Brushed motors
- Brush-less motors
If you have no idea what they mean, you do not need to worry because even without knowing what they mean and how their internal operation works, you can build your drone. To make things a bit simpler, you can watch this video (optional).
Brushed motors are used in popular quadcopters such as Syma X5C or Cheerson CX-10. The problem with them is the short lifespan. These motors do not last for a long time compared to the brush-less motors. In short, brush-less motors are actually better but as we are basically doing a small and simple project in our How to Build a Drone Series, we will pick a drone from this list of Amazon: Brushed Motors For Drone
If you are an engineer, you must be wondering that why we are not talking about stuffs like inrunner & outrunner motor system and so on. You have to understand that we do not want you to be an engineer in this How to Build A Drone Series. We just want to make sure that you can build a drone on your own and that is it. Even though we do not want to make things complex, you must know about a few terms about motors which will help you later on.
Note: If you seriously want to do each and every step in an analog method on your own (by building everything in your garage), you can check PCBWeb. It is a CAD application that designers use to design the internal functions of their drones. If you are new, you won’t understand anything about it (don’t worry about that).
What is KV
KV is a rating system of motors and the KV will tell you that how fast a motor runs (rotates). For our quadcopter, we do need a motor that has a KV of around 1000-1500 at max. If you know this much, it should be fine but for your understanding, let’s do the math:
If the KV rating of a motor is 1000 rpm/v then when there will be a voltage of around 11.1V, the motor will be rotating at a speed of 11.1V times 1000 which is 11100 rpm. On the other hand, if you take a lower voltage (low powered battery for example) then the rpm will be lower.
A Bit More About Motors
Before ending today’s tutorial of how to build a drone, let’s know a few more facts about motors. If you buy a brushed motor, you will see that there are two connection parts (wires). Obviously, one of them will be considered positive and the other part will be the negative one.
If you buy a brushless motor, you will find three connections. As we are buying a brushed motor for this tutorial, let’s not talk about them as it will be complex to understand.
When you are buying the motor from Amazon, make sure that you are checking stuffs like previous reviews to make sure that you are not buying anything with defect. If you have any confusion, please feel free to ask us. Best of luck and we will see you in the third part of this tutorial.