Vibration Motors

An eccentric rotating mass vibration motor (ERM) uses a small unbalanced mass on a DC motor when it rotates it creates a force that translates to vibrations. ... A linear resonant actuator (LRA) contains a small internal mass attached to a spring, which creates a force when driven.

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The working principle of vibrator motor In other words, there is an eccentric weight on the rotating shaft of the vibration motor, which generates centrifugal force when it rotates. This unbalanced force displaces it. Its high-Speed displacement causes it to swing, which is called “vibration”.