Linear Vibration Motor(LRA)

A Linear Vibration Motor (LVM) operates by utilizing electromagnetic force to drive an internal moving mass in a controlled back-and-forth motion along a single axis. Unlike conventional ERM (Eccentric Rotating Mass) motors that generate vibration through rotational imbalance, a linear vibration motor creates vibration through linear oscillation, resulting in faster response times, greater precision, and improved energy efficiency.

When an alternating electrical signal is applied to the motor’s voice coil, a magnetic field is generated. This magnetic field interacts with a permanent magnet and spring system inside the actuator, causing the moving mass to oscillate at its resonant frequency. The rapid reciprocating motion produces a highly controlled vibration force that is transmitted directly to the host device.

Because the vibration is generated along a dedicated vertical axis, linear vibration motors can deliver crisp, consistent, and highly responsive haptic feedback while minimizing unwanted lateral vibrations. This precise motion control enables superior tactile performance in applications where user experience is critical.

Key Operating Principles

• Electromagnetic Actuation – Electrical current generates a magnetic field that drives the internal moving mass.
• Resonant Oscillation – The mass and spring system vibrate at a tuned resonant frequency for maximum efficiency.
• Linear Motion – Vibration is produced through controlled up-and-down movement rather than rotational motion.
• Fast Response – Rapid start-up and stop times provide accurate and responsive haptic feedback.
• Efficient Energy Transfer – Resonance-based operation maximizes vibration output while minimizing power consumption.