Basic component of multi rotor UAV -- brushless motor

There is also a "power system" in the entire quadcopter (or other multicopter). This "power system" consists of an ESC, a motor and a blade. In this section, you will learn how to choose a "power system" for a quadcopter according to your needs.

The basis of making drones is brushless motors. To make the whole drone hover in the air, the combination of motor and propeller is necessary. To make the UAV's flight time as long as possible, it is necessary to find a balance between the weight of the motor, the propeller and the entire structure. Like all motors, brushless motors include bearings, coils, magnets (neodymium magnets for small motors, electromagnets for large motors), and a stator and end cover connected by bearings

The important features of brushless motors are KV value, weight, no-load current, maximum current and maximum voltage that can be carried.

The brushed motor is rotated by obtaining the force of the magnetic field in a fixed direction through the structural design of the brush and the inverter. The brushless motor has no brushes and inverters. How does it get the force of the magnetic field in a fixed direction? Simply put, by changing the alternating frequency and waveform of the current wave input to the stator coil of the brushless motor, a magnetic field is formed around the winding coil to rotate around the geometric axis of the motor. This magnetic field drives the permanent magnet on the rotor to rotate. The motor will spin up.