The "heart" of FPV: the motor

                  The motor is the core component of the power system of a drone, responsible for driving the propellers to rotate and generate lift and thrust. Also known as an engine, the motor converts electrical energy into mechanical energy, enabling the drone to take off, hover, land, and move. The power and efficiency of the motor directly affect the drone’s performance and flight time. Motors are classified into DC motors and AC motors. DC motors are further divided into brushed DC motors and brushless DC motors. Drones mainly use brushless DC motors, while a small number of low-cost or toy-grade drones may adopt brushed motors.

            Brushed DC motors mainly consist of a stationary magnetic pole stator, a rotatable coil rotor, a commutator, and a pair of brushes (brushes are mainly made of graphite, so they are also called carbon brushes). Brushed DC motors adopt mechanical commutation: the magnetic pole stator and brushes remain stationary, while the coil rotor and commutator rotate. Friction occurs between the brushes and the commutator, allowing current commutation in the coil at a certain frequency, thus achieving continuous rotation of the rotor.
☆：Advantages: simple structure, low cost, and simple control circuit.
☆：Disadvantages: low efficiency, short service life (brushes are prone to wear), mostly used in micro toy drones.
            Brushless DC motors mainly consist of a magnetic pole rotor, a multi‑stage coil winding stator, and a Hall‑effect position sensor (optional). Their operating principle is based on electromagnetic induction and magnetic field interaction. The stator comprises multiple coils, usually wound with insulated wire and fixed to the motor housing. The rotor is made of permanent magnets, generally arranged in a specific pattern. Brushless motors must be controlled by an **ESC (Electronic Speed Controller)**, which converts DC power from the battery into three‑phase AC power and adjusts the motor speed according to flight control signals.
☆：Advantages: high efficiency, long service life, low heat generation, strong power, and maintenance-free (no brush wear).

☆：Disadvantages: Requires a matching Electronic Speed Controller (ESC) for control, resulting in higher cost.

               
              Key Motor Parameters >> **KV Rating**: Indicates the motor’s speed per volt (RPM/V) under no load. For example, a 1000KV motor runs at approximately 10,000 RPM at 10V. - **Low KV**: Suitable for large propellers (e.g., long-endurance or large drones). - **High KV**: Suitable for small propellers (e.g., racing drones, high speed but low torque). >> **Size Label**: Usually expressed in numbers (e.g., 2205, 2306). The first two digits represent the stator diameter (mm), and the last two represent the stator height (mm). For example, a 2306 motor has a diameter of 23 mm and a height of 6 mm. Larger size generally means higher torque and power, but increased weight. >> **Power and Efficiency**: Power is determined by voltage, current and KV rating, and must match the propeller load. High-efficiency motors extend flight time.
             The selection of a drone motor requires comprehensive consideration of the aircraft type, load, endurance, and flight purpose. Brushless motors have become the mainstream due to their reliability, and the matching of KV rating, size, and propellers is the key to performance optimization.