The FPV Brushless Motor SZ2207 is the best FPV motors for your first drone build. Here’s my top pick of FPV motors, and everything you need to know about choosing the FPV Brushless Motor SZ2207.
What FPV motor is right for your drone?
There are many drone motor products on the market, some are expensive and some are cheap. Expensive motors may not be right for your drone, and cheap motors aren't necessarily bad either. So, how to choose the right drone FPV motor for you？
A good drone motor can generate thrust that is at least 10 times the weight of the drone. Small UAVs require large KV motors and small stators, while larger UAVs require small KV motors and large stators. High thrust is critical for speed, while high torque increases acceleration. Extend flight time with high-efficiency motors.
What are the features to check when shopping for the best drone motor?
Know the dimensions of your drone
First you need to know the size and weight of your drone.
The drone weight should include the batteries, wiring, the motors themselves, and everything else on the drone!
It is better to overestimate your weight than underestimate it. If you underestimate the weight, your drone may not be powered enough to fly properly.
A drone with a small frame may not be suitable for a large motor. Excessive power makes the drone difficult to operate. Also, a small motor is not suitable for powering a large drone, as it may not generate enough thrust to keep your drone flying.
The new propulsion design in born with agility and extreme corner shifting speed, Which helps you operate Your drone with ease whether in straight-line speeding or corner shifting.
Texture of FPV Brushless Motor SZ2207 Material
FPV Brushless Motor SZ2207 thrust
After determining the size and weight of the drone, the next step is to determine how much thrust is needed to get the drone flying fast enough.
The motors should produce a total of at least 10 pounds of thrust for every pound of the drone's weight.
Since you have 4 motors, this means each motor weighs 2.5 lbs.
The higher the thrust-to-weight ratio the faster the speed, the downside of a high thrust-to-weight ratio is that it can be difficult to control as your drone will be moving at high speed. On top of that, higher thrust also means higher current draw.
You need to make sure the battery is good enough to support the current draw and the flight time long enough.
So the next question is, how do I know how much thrust the motor is generating? Here is FPV Brushless Motor SZ2207 thrust data
Motor Size Selection
A brushless motor has a part called the “stator,” and this is the part that is referred to by the size classification of brushless motors, usually indicated as a 4-digit number, XXYY. XX, or the first two digits, refers to the diameter or width of the stator, and YY, or the last two digits, refers to the height of the stator.
The general rule for the size selection is if it has a taller stator, your drone will have greater power even at higher rotations per minute (RPM), aka max speed. On top of that, the motor becomes more responsive.
A wider stator will produce more torque at a lower RPM. Torque is essentially the factor that determines how fast your drone will reach your desired speed, aka acceleration – making it a factor that is crucial for precision and easier turning.
On top of that, wider stators dissipate heat faster due to larger surface area. This allows the motor to perform consistently without overheating. It is also more efficient, smoother, and lasts longer. However, wider stators are less responsive and less powerful.
Having said that, you shouldn’t always go for the biggest motor. As mentioned earlier, the size of frame and props play a role in deciding the size of your motor.
So, what exactly is a motor KV rating? Why is it important to look at motor KV when selecting motors for your drone?
KV in drone motors stands for velocity constant. It tells you roughly how fast (in RPM, revolution per minutes) the motor runs per volt when it is unloaded (without props). For instance, a motor with a KV of 2100 supplied with 4.2V runs roughly at 4.2 x 2100 = 8820 rpm.
Do know that the KV value does not tell you the efficiency, power, or even current capacity of the motor. In fact, you don’t even need to know how fast your motor can theoretically spin in order to build your own drone!
In a nutshell, high KV means higher speed but lower torque. FPV Brushless Motor SZ2207 have three KV Options Available (1750, 1950, 2750) - Different KVs match different batteries and propellers for different flying styles.
Higher speed is not necessarily good. Beginners may have issues adapting to the speed from high KV motors. Don’t chase after high KV motors if you are still new in this hobby.
On the other hand, lower torque is bad. This means the motors need to draw more current to start rotating the props. If you put a big prop on a high KV motor, it struggles even more to rotate the props. This causes overloading, which leads to overheating, and ultimately motor damage.
Due to that reason, lower KV motors are usually paired with larger drones (with larger props), while higher KV motors are utilized for smaller drones.
Battery voltage can also affect your decision on motor KV. 4S drones use higher KV motors to achieve the desired speed. On the other hand, the 6S equivalent uses lower KV motors to improve the torque, achieving the same speed.
The table below shows the recommended combination of frame size, prop size, stator size and KV. This is merely a recommendation and it is not casted into stone.[caption id="attachment_654" align="alignnone" width="512"] Common motor, frame and props combinations[/caption]
Weight of Motor
Obviously, FPV motors come with weight. The 4 motors make up quite a substantial proportion of the drone’s weight. In fact, it is the heaviest part besides the battery. Hence, getting a lightweight motor can improve the overall speed of your drone.
Because the motors are located at the edges of the frame, changing the flight direction when turning requires additional force to offset the existing momentum. Heavier motors mean higher momentum.
Since a lighter motor results in lower momentum, less force is required to change the movement, resulting in faster acceleration and deceleration. In races, it makes your drone turn faster and exit a corner quicker. However, it is not as durable to crash as a heavier motor.
Motor efficiency basically measures how much thrust a motor generates per watt or amp at different throttles. The higher the value, the more efficient the motor.
Certain motors are more efficient at medium throttle while some are more efficient at full throttle. When you are looking into this stat, you should consider your play style so that you choose one that fits your play style.
But why does it matter? A highly efficient motor makes the most out of your battery in terms of both flight times and battery life. Essentially you can fly longer and don’t need to buy new batteries as often.
A motor with a wider stator has higher low end torque, which makes it accelerate faster and hence respond faster when changing directions. Traditionally, drone racers often look at the stator size when choosing FPV motors so that they can get those with the highest torque.
However, with the advancement of technology, stator width is no longer the major factor that affects the torque.
Things like N54 magnets, curved magnets, thinner stator lamination, better flux ring design and tighter clearance between magnet and stator allow generation of high torque even by smaller stators. FPV motors with those designs should be prioritized.