PERMANENT MAGNET SYNCHRONOUS LINEAR MOTOR

摘要

A permanent magnet sychronous linear motor comprising a field yoke (1) having a plurality of permanent magnets (2) the polarity of which is alternated and which are arranged linearly and an armature (3) facing the array of the permanent magnets (2) through a magnetic air gap, wherein the armature (3) comprises an armature core (4) having main teeth (4b) and slots (4a), an armature winding (5) wound in the slots 4a of the armature core (4), and auxiliary teeth (6) provided at both the ends of the armature core (4). The distance tau p between the centers of the auxiliary teeth (6) and the pitch tau m of the field poles satisfy a relation tau p = (2n-1) x tau m/2 (n is a positive integer) and the length O of the auxiliary teeth (6) is in relation of O < Hd < Ht where Hd is the length of the auxiliary teeth (6) in the direction orthogonal to the array of permanent magnets and Ht is the length of the main teeth (4b) in the direction orthogonal to the array of permanent magnets. Thus a high performance permanent magnet synchronous linear motor having reduced cogging thrust can be provided.