Coin Linear Vibration Motors (LRA’s)

Due to their fast Rise and Fall times, linear resonant actuators (LRA) vibration motors are an excellent choice for haptic / tactile feedback applications. Their simple internal construction offers high reliability and exceptionally long life when compared with brush type ERM coin vibration motors.  It should be noted that  LRA’s can not survive the high temperatures of a reflow oven and hence we do not offer a SMD reflow version.   HERE to see a cross section of a typical LRA and HERE for a comparison of LRA’s vs. Brush Type Motors.

LRA’s are unique in that they can be driven at very low voltage levels ( ~ 0.1 Vac ) with a current as low as 12 ma,  allowing engineers to tailor the vibration level to the minimum required, thus extending the devices battery life. Usability studies should to be conducted to determine the minimum acceptable  level of vibration G force for the application, and then the Haptic Driver IC programmed accordingly.

Our coin shaped linear resonant actuators oscillate along the Z axis, perpendicular to the motors surface. This Z axis vibration efficiently transmits vibrations in wearable applications. In Hi-Rel applications, they are a viable alternative to brushless vibration motors as the only internal parts that are subjected to wear / failure are the springs.         (continued below the table )

The “typical current” is the average current from 20 motors selected at random from a given production lot. Copies of the test report showing the data collected for all 20 motors are available upon request.