All about vibration motors and how its frequency and amplitude be controlled in this app note from Precision Microdrives. Link here
We’re often asked how to adjust the vibration amplitude or frequency of our various vibration motors. In this article, we’ll look at how simple it is, why it can be useful, and how we can predict the behaviour of a motor using the driving voltage and Typical Performance Characteristics graph.
from Dangerous Prototypes http://bit.ly/2SFoYZz