Linear motor and machine tool having the same mounted thereon

摘要

Linear motor (1 ) with permanent magnet mover (2) for use in a punching machine. The permanent magnet mover is alternately polarised in axial direction. A small iron ring (13) around the permanent magnet mover (2) serves as a magnetic holder for the vertical mover (2) when the machine is stopped. For the stop position the mover is shifted outside the stroke range (L) so that a high field gradient faces the ring (13). During punching operation the ring (13) is passed within a low field gradient region of the mover (2) in order to achieve a homogenous stroke force.