DC Motors for Drones
DC motors for drones are powered by DC current from sources such as batteries or power supplies. They use a component called a commutator that reverses the direction of electric current in the rotor each time it rotates through half a turn. Without this, the motor would not continue to spin in the same direction, as the magnetic field will have changed direction.
Permanent Magnet Motors
Similar to brushless DC motors, permanent magnet motors are known for reliability, efficiency and cooler operating temperatures. They can also have a longer lifespan than other types of drone motor. The most common permanent magnet motors use neodymium magnets to create a constant magnetic field, however as a rare-earth material this can make PMSM motors expensive.
Drone Servo Motors
Drone servo motors can use various types of motor, such as simple brushed DC motors up to complex industrial AC induction motors. Servo motors, otherwise referred to as servos, can be controlled with precision using analogue or digital electronic signals, indicating to the motor the required position of the motor shaft. A high degree of precise positioning is reached by using feedback circuitry and a position encoder.