Patent ID: 6831379
Filing Date: 2004-12-14
Classification: H02K

Abstract:
A permanent magnet synchronous linear motor comprising:a field yoke having a plurality of permanent magnets which constitute field poles so that a polarity thereof is alternated and which are arranged linearly, and an armature facing an array of the permanent magnets through a magnetic air gap; the armature comprising an armature core having main teeth and slots, an armature winding wound in the slot of the armature core, and auxiliary teeth provided at both ends of the armature core; a center-to-center distance &tgr;p of the auxiliary teeth and a pitch &tgr;m of the field pole satisfying a relationship of &tgr;p=(2nâˆ’1)Ã—&tgr;m /2 (n is a positive integer); and the field pole and the armature being relatively moved under the condition that one of the field pole and the armature is caused to serve as a stationary element and the other one is caused to serve as a movable element, wherein a length of the main teeth is constant and a length of the auxiliary teeth is set to be in the range of 0