5 Things To Remember When Choosing Quadcopter Motors

quadcopter motors

Introduction:

There are certain considerations and rules which you must remember while selecting effective quadcopter motors.

5 Things to Remember:

Decide the Quacopter Motor Size:

The first thing you need think about is the motor size which you will need for your quadcopter. You need to ask yourself two questions for this purpose:

  • What is the size of your quadcopter’s frame?
  • What is the planned total weight of your quadcopter?

When talking about the size of the frame, you must be aware of the maximum propeller size that can be used in your model. When talking about the planned total weight, you must take everything into consideration including battery, frame, motors, wires, ESCs etc. By knowing the answer to these two questions, you can get a rough estimate of the size of motors you will be actually needing.

Thrust To Weight Ratio:

The rule of the thumb is that at least twice the amount of weight should be available as thrust. If the thrust provided by the motors is not sufficient, your quadcopter would not respond well to the control. It may even face difficulty while taking off. For FPV drones, the ratio between thrust and weight should be higher. Maybe 8:1 or 10:1. But if this ratio is too high, the quadcopter would become very hard to control.

Quadcopter Motor Size And KV:

The wider and taller the motor, the more torque it can generate.

KV is another important parameter which will influence your choice of motor. Theoretically, it means an increase in the motor’s rotations per minute when the voltage increases by 1 volt without load. Motors with higher KV would try to spin the propeller faster. Lower KV means usually generate a higher torque. It is for this reason that we tend to see larger props are matched with low KV motors whereas smaller props are attached with high HV motors.

N And P:

In case you see something like ‘12N14P’, you must not get confused. The numbers before letter ‘N’ (in this case ‘12’) denotes the number of electromagnets in the stator and the number ‘14’ denotes the permanent number of magnets in the motor.

In case you find that a particular motor has more electromagnets and permanent magnets, it simply denotes that the torque produced by that particular motor increases more efficiently.

Voltage:

Your motor will spin harder when a high voltage is applied and thus it will draw higher current. Thus it is always important to understand the voltage and current drawn by a motor before choosing it.

Comparing Quadcopter Motors:

Thus, in short, following factors need to be considered for selecting the best motor for your quadcopter:

  • Thrust
  • Efficiency
  • Current Draw
  • Weight

Other important factors which may influence your choice are:

  • Response
  • Best props
  • Vibration
  • Temperature

Some other features of motors which might grab your attention are:

  • Type of magnets
  • Solid/Hollow shafts
  • Cooling design
  • ESC integration
  • Arc magnets
  • Smaller air gaps
QUADCOPTER MOTOR

Check out the best quadcopter motors here

Top 5 Quadcopter Motors You Should Know About

quadcopter motors

So how do quadcopter motors work?

First off, the propellers of your drone are connected to a motor. These quadcopter motors cause the propellers to spin around and create the thrust which is needed to make the quadcopter fly. In the case of multiple motors, the thrust is generally upward which keeps the drone flying. In the case of fixed wing aircraft, the thrust generated is forward which pushes the machine ahead.

When dealing with quadcopters, you will have to deal with two kinds of quadcopter motors namely, brushed motors and outrunner brushless motors. Usually, brushed motors are found in toy grade drones. They are cheap to manufacture but have a very short lifespan. Brushless motors are stronger and more durable. Brushless motors mainly comprise of rotor and stator. The stator contains the electromagnets whereas the rotor is the part that rotates and has magnets mounted on it in a radial pattern.

They contain a bunch of electromagnets which are connected together in specific pairs. The electronic speed controller or motor controller controls the motor by activating and deactivating certain sections of the electromagnets at certain times which causes the motors to spin due to the magnetic force. These electromagnets are connected to three main sections.

The top 5 quadcopter motors are-

This particular battery model is a complete redesign of 22XX sized quadcopter motor. Lumenier RX 2206 motor has been engineered from the very beginning and is a perfect blend of high-end performance and elegance. These motors certainly have a lot to give.

PROS:


  • It is ultra light weight.
  • The flanged aluminum lock nut is attached to each motor which ensures that the propellers do not come loose during the flight.
  • It delivers a decent performance.
  • It is a cost-effective motor.

CONS:


  • It is not very powerful.

ROTORGEEKS 2204 2300 KV:

These motors have been recently launched in the market. These motors give a befitting competition to the legendary Cobra’s 2204 (5) 2300. These Cobra motors have been a huge success in the high-end FPV market since a year. As Cobra has been suffering from relatively poor quality controls, these Rotorgeek’s motors have managed to gain an upper hand in the drone motor market.

PROS:


  • These motors are very reliable.
  • Built in complete black, these motors are extremely elegant and minimal.
  • They are comparatively faster than Cobra models.

CONS:


  • They are not the most premium model available in the market. One can find better options.

RCX 2205 2633 KV:

These are by far the cheapest motors available on this list. RCX 2205 completely matches Cobra’s thrust tests and in many cases, even exceeds their numbers. These motors usually come balanced out of the shop which means that they are completely ready to fly.

PROS:


  • These are relatively cheap.
  • They are usually ready to fly.

CONS:


  • These motors may draw in excess of 30 A.
  • There have been many issues with bells flying off in the smallest of all the crashes.

X NOVA 2206 2000 KV:

X Nova is a very popular name in the 3D Heli world. It usually deliver a very high-quality performance and have built solid reliability. This particular model gives a maximum thrust of 1141 grams on 6045 tri blades. It is perfect for those pilots who want to push their 6 inches setups to extreme limits.

PROS:


  • This model is ideal in terms of thrust tests.
  • The temperature also remains low while these motors are in use.
  • These motors are as promising as Cobra’s and Tiger’s motors.

CONS:


  • One can find motors with greater thrust and efficiency in the market.

EMAX RS 2205:

This latest motor of Emax has a huge potential. It is an improved version of Emax 2206. The thrust numbers of Emax RS 2205 are huge. It produces over 1 kg of thrust on a 5045 bullnose propeller. So technically speaking, Emax RS2205 has a potential to outperform Cobra motors.

PROS:


  • Very high thrust number.
  • This motor is overall reliable and has a high quality.

CONS:


  • Not that we know of

Still confused about which motor to choose? Here are some pointers.