DJI 2212-920KV Four-axis Brushless Motor

Description:
A brushless DC electric motor (BLDC motor or BL motor), also known as the electronically commutated motor (ECM or EC motor) and synchronous DC Motors, are synchronous motors powered by direct current (DC) electricity via an inverter or switching power supply which produces electricity in the form of alternating current (AC) to drive each phase of the motor via a closed-loop controller. The controller provides pulses of current to the motor windings that control the speed and torque of the motor.
A brushed DC motor has permanent magnets on the outside of its structure, with a spinning armature on the inside. The permanent magnets, which are stationary on the outside, are called the stator. The armature, which rotates and contains an electromagnet, is called the rotor.
A brushless DC motor is essentially flipped inside out, eliminating the need for brushes to flip the electromagnetic field. In brushless DC motors, the permanent magnets are on the rotor, and the electromagnets are on the stator. A computer then charges the electromagnets in the stator to rotate the rotor a full 360-degrees.
The advantages of a brushless motor over brushed motors are high power-to-weight ratio, high speed, electronic control, and low maintenance. Brushless motors find applications in such places as computer peripherals (disk drives, printers), hand-held power tools, and vehicles ranging from model aircraft to automobiles.
Brushless DC motors typically have an efficiency of 85-90%, while brushed motors are usually only 75-80% efficient. Brushes eventually wear out, sometimes causing dangerous sparking, limiting the lifespan of a brushed motor. Brushless DC Motors are quiet, lighter, and have a much longer lifespan. Because computers control the electrical current, brushless DC motors can achieve much more precise motion control.
DJI 2212 920Kv motor is a powerful replacement for any multirotor application.
It capable of producing up to half a kilogram of thrust on a standard DJI 9" prop.
The set includes four motors and mounting screws.

Features:
Rating: 920kv
Battery: Li-Poly (11.1V) 3S, Li-Poly (14.8V) 4S
Shaft: 8.0mm
Weight: 56gr (with Prop Adapter)
Standard Current: 15~25A
Max Current: 30A
Dimension: 28×24mm