How to define micro DC motor?

Micro-DC motor, refers to the output or input for the DC power of the rotating motor.
Features miniature DC motors are:
1. Miniature DC motor efficiency generally higher than other types of motor, so to achieve the same output power, the size of the DC motor is generally relatively small. For a limited installation location, the micro-DC motor is relatively more appropriate.
2. Micro DC motor has a characteristic that the motor can be based on the size of the load, automatic deceleration, to achieve great starting torque. This AC motor is more difficult. In addition, the DC motor is relatively easy to absorb the sudden change of the load size, the motor speed can automatically adapt to the load size.

Usually shape refer to below:

4

Flat 280 motor