In recent years, with the increase in consumers’ requirements for tactile feedback, linear resonant actuators have become more and more popular. A linear resonant actuator contains a moving mass attached to a wave spring, which creates a force when driven. Compared to the ERM vibration motor, the linear vibration motor has faster acceleration. It takes only 50ms from the standstill to the highest vibration level, while the ERM vibration motor needs 100ms~200ms. Higher accelerations result in better haptic feedback, so more and more mobile phones are starting to use linear motors instead of traditional motors.