LRA motor diagram courtesy of Precision Microdrives. So it’s not “fundamentally surprising” that the vibration motor could be used to pick up sounds, the two wrote in their paper (PDF ...

However, due to its small size, the vibrations are often not as strong as those of a cylindrical vibration motor! Note that there is another similar motor worth mentioning called the LRA (Linear ...

Tiny motors used for haptic feedback and vibration come in a variety of shapes ... a coil which pushes the mass back and forth. The name LRA might not be familiar but Apple’s branded ...

Each board accepts either a eccentric rotating mass (ERM) or linear resonant actuator (LRA) — two types of vibration motors with ERM being what you might associate as a pager motor while the LRA ...