Patent ID: 6917126
Filing Date: 2005-07-12
Classification: H02K

Abstract:
1. A sliding means with built-in moving-magnet linear motor, comprising a bed of magnetic material, a table of magnetic material arranged movable lengthwise of the bed in a sliding manner with respect to the bed, a field magnet arranged on a surface of the table, which opposes to the bed, the field magnet having unlike poles alternating in polarity in a moving direction of the table, armature windings installed on a surface of the bed, which confronts the field magnet of the table, and a means for monitoring a position of the table with respect to the bed, wherein said armature windings consist of three armature windings composed of coreless coils each having a substantially rectangular flat shape, said coils being arranged in juxtaposition in the lengthwise direction of movement of the table, each of said armature windings being connected to receive a respective phase of a three-phase current, so that the three-phase current flowing in the armature windings interacts with magnetic flux created by the field magnet to produce an electromagnetic force to drive the table along the bed in a sliding manner with a desired position control, wherein the field magnet is made of a permanent magnet of rare earth and has five poles for the three armature windings, and wherein the table fits on the bed in the lengthwise direction of movement of the table by virtue of a linear motion guide unit, which is composed of track rails provided on the bed and a slider mounted on the bed for sliding movement, the slider having the table thereon.