Patent ID: 9079279
Filing Date: 2015-07-14
Classification: B23Q,F16C

Abstract:
1. An actively compensated stage comprising: a guide support having first and second guide surfaces perpendicular to each other; a table having first and second sides opposite the first and second guide surfaces and having air bearings on the first and second sides; a driving linear motor moving the table straight in an x-axial direction; and a plurality of magnetic actuators applying a magnetic preload between the guide support and the table and changing a magnetic force between the guide support and the table to compensate for 5-DOF motion errors generated in the table, wherein the magnetic actuators include: first and second actuators spaced in the x-axial direction on the first side; third and fourth actuators spaced in the x-axial direction on the second side; and a fifth actuator spaced from the third and fourth actuators in a z-axial direction on the second side, and the first to fifth actuators respectively include: a permanent magnet disposed opposite the guide support to generate a magnetic preload; an inner core supporting the permanent magnet; a coil wound around the inner core; and an outer core disposed around the coil in a ring shape to surround the coil.