LVM-SERIES LINEAR VIBRATION MOTORS ELV-1411A
|14mm x 11mm x 2.5mm||AC 2.0 Vrms||150 ± 0.1 Hz||90mA||1.5 G|
Need-For-Power Motor offers its LVM-series linear resonant actuator vibration motors
Due to their fast rise and fall times and superior braking ability, NFP’s linear resonant actuators (LRA) vibration motors are an excellent choice for haptic applications. Their relatively simple internal construction also offers high reliability and exceptionally long life when compared with brushed ERM motors. NFP’s LRA’s have an internal mass that oscillates back and forth along the X-axis at its resonant frequency. They are an excellent alternative to brushless vibration motors as the only internal parts that are subjected to wear / failure are the springs.
- Long life
- Consistent resonant frequency
- Custom FPC and SMD connection methods are possible
- Superior rise and fall times
- Wearable devices
- Any light weight device requiring a silent alert or haptic feedback
When compared to standard brushed ERM vibration motors, LRA do have some disadvantages of LRA’s are:
– higher price point
– higher power consumption
– must be used with external driver IC
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 IC drivers for linear vibration motors that supply the correct drive signals and contain a library of haptic effects you can choose from. TI is one such company that makes LRA drivers IC’s. TI makes and evaluation board that incorporates the TI DRV2605L haptic driver IC. See below link for info:
It should be noted that 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 which in the case of our 2 LRA’s is either 180 or 200 hz. Due 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, none at all.