What is this tiny rotating piece of hardware that I found inside my Samsung GE1202? It has E9C written in blue on it.


2 Answers 2


These types of motor configurations are used in the cellphone's vibrate/buzzer function. Here is a Youtube video demonstrating the vibrate function and two other references:

diagram of motor with eccentric rotating mass
Click on image for a larger version of the image.

These are called Eccentric Rotating Mass (ERM) vibration motors. This type of motor technology is also used in haptic feedback technology.



That is a micro vibrating motor to produce the "buzz" effect from your phone. I used much much larger vibrating motors, air driven, on the bottom of my Class 7 dump truck. Mounted under the bed, they would vibrate the bed, loosening the material so it would flow out cleanly.

  • 2
    $\begingroup$ +1 for the dump truck vibrator - I'd never seen them before $\endgroup$ Commented Jul 23, 2015 at 11:58

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