A miniature linear vibration motor usually comprises a vibration assembly and a stator assembly. At present, most of the miniature linear vibration motors accomplish their reciprocating and periodic vibration through the vibration assembly. The vibration assembly accomplishes the reciprocating vibration through an elastic sheet or a spring.
Normally, the elastic sheet or the spring located at two ends of the vibration assembly is welded on the shell of the motor. The shape and size of the elastic sheet or spring are variously designed in consideration of the shape and size of the vibration motor and the performance of the vibration motor. However, since the elastic sheet or spring is mostly fixedly connected to the shell, an obvious polarization occurs during the vibration. Meanwhile, the polarization of the elastic sheet easily leads to the stress concentration and the plastic deformation of the elastic sheet, so that its effective life is significantly reduced. Besides, the collisions caused by polarization will generate abnormal noise and relatively obvious heat.