Application NFP-ELV1030A Linear Resonant Actuator LRA for Dive Watch Shearwater
Shearwater Research designs and manufactures computers for divers demanding more from themselves and their diving experience. The computer they used touch screen for diving. Haptic feedback is a must for the touch screen. They use our LRA - linear resonant actuator to finish the haptic feedback founction.
Linear Resonant Actuator (LRAs) is becoming more and more popular in tactile applications. As substitutes for Eccentric Rotating Mass (ERM) vibration motors, they have several obvious advantages: they provide super faster response, higher vibration efficiency, and provide longer life spans. Combined with the necessary drivers, they can provide more advanced haptic effects.
Generally the LRA motors are driven by an AC (alternating current), that's different from the traditional coin vibration motor. It has a specific peak amplitude and a specific frequency, and they are related to the structure of the motor. The LRAs driven by different frequency will cause different peak amplitude. Only when the LRAs are driven by the resonance frequency, it will create the biggest amplitude. Also the voltage will affect LRA's vibration strength too. So the resonant frequency and proper voltage are the key points to take care when design with the LRA motor.
The LRAs can driven by two ways typically. First, you can use a TI's IC DRV26XX series to drive them. Second, when during the prototyping or evaluation period, you can use a sine wave that generated from a signal generator to drive the LRAs. It's easy to operate, and can evaluate the linear vibration motor in a quick time. If you decide to use the linear resonant actuator, you should use the specific IC to drive the LRA. Because the IC can auto resonance with the linear vibration motor, and will create a biggest vibration strength.
|Vibration:||5.0m/s^2 at 100g Cubic Fixture(Organic Class)|
|Vibration Resonance Frequency:||175±5Hz|
|Norminal Operating Current:||80mA max|
|Max Input Voltage:||2Vrms|
|Mechanical Noise:||50dBA Max at 10cm|
|Operating Temperature Range:||-20℃ to +70℃|
|Storage Temperature Range:||-40℃ to +80℃|
You can buy the LRAs from the following link:
Choose the LRA driving IC from the following link:
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