Patent ID: 9726851
Date: 2017-08-08
CPC Classifications: G02B,H02K

Claim:
1. A voice coil motor, comprising: a stator assembly, a rotor assembly and an elastic connecting piece, the rotor assembly being connected to the stator assembly by means of the elastic connecting piece, the stator assembly comprising a stator sleeve, the rotor assembly comprising a rotor sleeve sleeved with the stator sleeve, wherein: one of the stator sleeve and the rotor sleeve is a permanent magnetic material sleeve, and the other thereof is a non-magnetic material sleeve; an assembly to which the non-magnetic material sleeve belongs also comprises: a pre-magnetic element made of a permanent magnetic or magnetized material and fixed with respect to the non-magnetic material sleeve, and a drive coil arranged at an inner surface or an outer surface of the non-magnetic material sleeve, a pre-existing magnetic force between the pre-magnetic element and the permanent magnetic material sleeve reaches equilibrium with an elastic force of the elastic connecting piece in a case without powering the drive coil.