a stator unit formed by stator segments successively connected to each other, wherein the stator unit comprises a frame and coil windings mounted on the frame and arranged sequentially along an extending direction of the frame;

mover units movable relative to the stator unit, wherein each of the mover units comprises a mover slidably connected to the stator unit and movable relative to the frame, and a magnet fixed to the mover; and

actuators,

wherein the magnet is arranged directly opposite to and spaced from the coil winding, and the coil winding drives the magnet to cause the mover to move,

wherein the frame comprises alternatingly arranged feedback segments and transition segments,

wherein the stator unit further comprises hall elements mounted on the transition segments and fixed at intervals to the frame, each of the actuators corresponds to multiple ones of the coil windings, each of the hall elements is arranged corresponding to one of the coil windings, and each of the actuators is electrically connected to the hall element and the coil winding; the hall element is spaced from the magnet; the hall element and the coil winding are located on a same side; and

wherein a magnetic field variation is produced when the mover unit moves to a magnetic field range of one of the coil windings, and one of the hall elements within the magnetic field range outputs a hall signal according to a magnetic field variation detected; the actuator corresponding to the hall element calculates an electrical angle based on the received hall signal and calculates a drive current according to a preset initial velocity of the mover unit and the electrical angle, and one of the coil windings corresponding to the hall element drives the magnet according to the drive current to move to realize position correction.