Features Of Linear Resonant Actuator

LRA – Linear vibration motors are an excellent choice for haptic feedback applications requiring a device with high reliability and exceptionally long life. Compared to traditional ERM vibration motors, LRA’s are a superior choice for haptic applications due to their faster rise / fall times. Vibration energy is generated by an internal mass that oscillates back and forth along one axis at its resonant frequency.

Our LRA’s are designed to have a resonant frequency / vibration frequency in the 200 hz range which research has shown to be optimal for the nerve receptors of the skin.
LRAs are an excellent alternative to brushless vibration motors as the only internal parts that are subject to wear and failure are its internal springs. Unlike conventional brushed DC vibration motors, linear resonant actuators must be driven by an AC signal at the devices resonant frequency. A number of companies make haptic IC drivers for linear vibration motors that supply the correct AC drive signals and contain a library of haptic effects you can choose from. These driver ICs also provide over drive and braking signals to the vibration motor which further improves rise and fall times thus providing a superior haptic feedback experience for the user. Unlike brushed ERM vibration motors, varying the amplitude of the applied voltage will only change the amplitude of the vibration force, not the frequency of vibration. The frequency of vibration is fixed at the LRA’s resonant frequency. Due to the LRA’s Hi-Q, applying a frequency above or below the resonant frequency of the LRA will result in the LRA producing a lower vibration amplitude or if far from the resonant frequency, no vibration at all..

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Human Sensorimotor Control
Small vibro-tactile stimulators (NFP's encapsulated vibration motor) applied on a participant’s neck.

Tactile sleeve for social touch
TaSST (Tactile Sleeve for Social Touch), a touch-sensitive vibrotactile arm sleeve. The TaSST was designed to enable two people to communicate different types of touch over a distance.

TNO Tactile Feedback Glove
The glove is a perfect example of ideas regarding feedback on the hand. The glove is plug-and-play and is connected through the research environment using software API. Coin motors creates vibration feedback to different fingers.

Vibrating Alert For Wearables
Smart wearable devices are a new area that has become popular in recent years. The main application area is smart watches or smart bracelets. When receiving new information or telephone calls, the reminder by vibration is natural and effective.

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