MOVING MAGNET TYPE LINEAR SLIDER

摘要

There is provided a moving magnet type linear slider capable of eliminating a magnetic suction force caused by a linear motor so as to minimize the linear guide friction. The field of the linear motor is formed by a magnet track (2) formed by a magnetic yoke (4) having a U-shaped cross section and a pair of field permanent magnets (3) having magnetic poles arranged with alternating polarities along the longitudinal direction of the inner opposing surfaces of the magnetic yoke. The linear motor has an armature formed by an armature holder (12) attached in the perpendicular direction onto the side of a fixed base (1) and a planar coreless armature coil (11) arranged to be orthogonal to the armature holder (12). The length Lmg of the magnet track (2) in the stroke direction is set greater than the length La of the armature (10) in the stroke direction. Moreover, a gravity compensation spring (19) is arranged on the bottom of the magnet track (2) so as to oppose to the fixed base (1) for balancing with the weight of a movable element.