An actuator may include a stator, a pole; a bobbin; and windings provided around an exterior surface of the bobbin. The stator may include a stator body; and a plurality of magnets circumferentially arranged around an inner surface of the stator body. The stator, the pole, and the bobbin may be coaxial. An outer diameter of the pole may be smaller than an inner diameter of the bobbin such that the bobbin is movable in an axial direction over an exterior surface of the pole. An outer diameter of the bobbin may be smaller than an inner diameter of the stator such that the bobbin is movable in an axial direction inside the plurality of magnets circumferentially arranged around the inner surface of the stator body.