Why Choose Brushless Motors For Multi-Rotor Drone?

Agility, durability, and reliability are crucial for multi-rotor drones, one crucial component: is the brushless motor. As drones continue to soar to new heights in popularity and functionality, understanding why brushless motors for multi-rotor drone reign supreme in this domain becomes increasingly imperative.

The Foundation: Brushless Motors

multi-rotor BLDC motors

There is also a “power system” in the entire quadcopter (or other multi-copter). This “power system” consists of ESC, motor and propellers.

Brushless motors serve as the essential powerhouses propelling these unmanned aerial vehicles into the skies. Unlike their brushed counterparts, brushless motors operate with a refined design, offering efficiency, durability, and enhanced performance crucial for sustained flight.

At the heart of brushless motors lies a sophisticated assembly of components, including bearings, coils, and magnets. Neodymium magnets, renowned for their strength, are employed in smaller motors, while larger counterparts utilize electromagnets.

The arrangement comprises a rotating shaft encased within bearings, interconnected by a stator and end cover, forming a robust foundation for propulsion.

Key attributes define the capabilities of brushless motors, notably the KV value, weight, no-load current, maximum current, and voltage tolerance.

These specifications serve as benchmarks guiding engineers in selecting the optimal motor-propeller combination, ensuring equilibrium between power and efficiency.

Unlike brushed motors reliant on brushes and phase commutators to establish a fixed magnetic field direction, brushless motors employ a revolutionary approach.

By manipulating the frequency and waveform of the current input to the stator coil, a dynamic magnetic field emerges, enveloping the motor’s core.

This magnetic field impels the rotation of permanent magnets adorning the rotor, initiating the motor’s operation without the constraints of conventional mechanisms.

bldc working table

UAV Multirotor Motor Use Brushless Motors Reason

Most brushless motors for multirotor drones due to their superior performance and efficiency. With lower friction and reduced losses, brushless motors offer enhanced energy conservation compared to brushed alternatives. They also excel in heat dissipation, ensuring prolonged operation without overheating.

Additionally, their long lifespan, minimal noise output, smooth operation, and lower maintenance costs make them an ideal choice for drone propulsion systems.

Overall, brushless motors provide the reliability and efficiency necessary for sustained flight in various applications.

KV Value In Brushless Motor

1. The KV value stands as the paramount parameter defining the performance of a brushless motor. It represents the speed per volt input, showcasing the direct relationship between voltage and motor idle speed.

For instance, a motor with a 1000KV rating rotates at 1000 revolutions per minute at 1 volt. This linear correlation persists, where at 10 volts, the speed escalates to 10000 RPM under no load.

2. The motor’s nomenclature reveals essential dimensions. The first two digits denote the stator diameter in millimeters, while the last two indicate its height.

For example, “2212” signifies a motor with a 22mm diameter and a 12mm stator height.

3. Motors may feature turn count parameters like “12T” or “8T,” representing the winding turns.

More turns yield lower KV values, reduced maximum output current, yet heightened torque, and the shape of the motor is flat and thick. Conversely, fewer turns result in higher KV values, increased output current, but diminished torque, and the shape of the motor is thin and tall.

Choose Motor Laminations Manufacturer

Our expertise in stamping, winding, and rotor die casting is crucial. Motorneo product series includes BLDC motor laminations, servo motor laminations, direct drive motor laminations, axial flux stator laminations, amorphous motor iron cores, generator laminations, and linear motor laminations.

At our factory, we have multiple stamping machines(such as progressive stamping, compound stamping, and single-slot notching), automation winding, stacking machines, welding machines, die-casting equipment, adhesive bonding machines, injection molding machines, and epoxy power lines. The test equipment includes CMM, 2D imager projector, x-ray inspection, etc. 

With advanced technology and dedicated craftsmanship, we guarantee prompt delivery without compromising on precision or performance.

compound stamping motor laminations


In conclusion, brushless motors represent a pinnacle of efficiency and performance in the realm of drone technology. Their seamless operation, combined with precise control and longevity, makes them the preferred choice for powering multi-rotor drones.

By understanding the nuances of motor specifications and performance metrics, drone enthusiasts and professionals alike can optimize their aerial platforms for various applications.

As the drone industry continues to evolve, brushless motors are poised to remain at the forefront of innovation, driving advancements in efficiency, reliability, and versatility.


What are brushless motors, and how do they differ from brushed motors?

Brushless motors are electronic motors used in multi-rotor drones that operate without brushes, unlike traditional brushed motors. They offer higher efficiency, better power-to-weight ratio, and longer lifespan compared to brushed motors.

How do brushless motors contribute to flight stability and maneuverability?

Brushless motors offer precise control over rotational speed, allowing for more stable flight and precise maneuvers. Their quick response time and high torque output enable drones to adjust their position and orientation swiftly, enhancing overall flight stability and agility.

What factors should I consider when choosing brushless motors for my multi-rotor drone?

Important factors include motor size, KV rating (RPM per volt), power output, efficiency, weight, and compatibility with your drone’s frame and propulsion system. Additionally, consider the specific requirements of your drone’s intended use, such as payload capacity and desired flight characteristics.

Are there alternative motor lamination materials used in brushless motors for multi-rotor drones?

While silicon steel is the most common material for motor laminations, we use alternative materials such as amorphous metals or powdered metal alloys. These materials offer specific advantages such as even lower core losses or enhanced mechanical properties in certain applications, but they may come at a higher cost.

Try to contact us for high-quality motor cores in China.