VIBRATION ISOLATING DEVICE USING MAGNETIC LEVITATING DEVICE

摘要

A vibration isolating device capable of stably supporting a vibration isolating table to surely insulate a vibration-protected device from an external vibration, comprising a the vibration isolating table (10), magnetic levitating devices (31) to (34) supporting the vibration isolating table (10) in the state of non-contact with the table and applying a control force to the table, displacement sensors (41) to (44) detecting the relative displacement amount of the vibration isolating table (10) relative to a foundation and outputting displacement signals, acceleration sensors (61) to (63) outputting acceleration signals when detecting the vibration of the foundation, and a controller (5), the controller further comprising a first control loop for positioning the vibration isolating table (10) relative to the foundation by providing a feedback of the displacement signals to the magnetic levitating devices (31) to (34) and a second control loop for suppressing the transmission of vibration from the foundation to the vibration isolating table (10) by providing a feed-forward of the acceleration signals to the magnetic levitating devices (31) to (34) after compensation.