Patent UA-101907-C2 (UA)
Title: Spindle bearing on permanent magnets
Inventor: HRYTSENKO VOLODYMYR ILLICH
IPC: F16C32/06
Filed: 2012-02-20
Abstract: A device relates to machine-tool construction and in particular to the systems of automated control and stabilization of position of form-forming elements of high-precision machines for processing precise elements of optics and mechanics and can be used for construction of precision bearings on permanent magnets. This is achieved by the fact that in spindle bearing on permanent magnets that includes sensors of position of the shaft of the bearing, the power magnetic pushers, device of automated control of position of the bearing shaft, the shaft is arranged as component and includes output shaft, bearing shaft and tail element, at the ends of the bearing shaft, in screens, shaft magnets are installed as hollow cylinders with poles at the inner and outer side surfaces, in bushings installed in the body of the spindle bearing on permanent magnets, over the magnets of the shaft of the spindle bearing, by axles of rectangular coordinate system, four power magnet pushers are installed, each power magnetic pusher includes a permanent magnet installed to the screen made of magnetic soft material, piezoelectric motor installed to ceramic insulator and control screw, at that the permanent magnets of the power magnetic pushers are directed with poles to same poles of magnets of the shaft, the power magnetic pushers and the magnet of the shaft that are installed in one cross section of the bearing form a power magnetic suspension of the shaft of spindle bearing on permanent magnets, in the body of the spindle bearing on permanent magnets in ceramic bushing by half-axes of the rectangular coordinate systems, where the axes are parallel to the axes of coordinate systems by which the power magnetic pushers are installed, and sensors of position of the shaft of spindle bearing on permanent magnets are installed. Device for automated control of position of the shaft of spindle bearing on permanent magnets includes drive, first differential amplifier of mismatch signal, second differential amplifier of mismatch signal., first gap value measuring device, second gap value measuring device, amplifiers, switch “on-off”, piezoelectric motors of power magnetic pushers, at that the sensors of position of the shaft of spindle bearing on permanent magnets are electrically connected to piezoelectric motors of power magnetic pushers, at that the output of the drive is connected to the first inputs of the first differential amplifier of mismatch signal, second differential amplifier of mismatch signal, the sensors of position of the shaft of spindle bearing on permanent magnets are connected to gap value measuring devices, and the outputs of those are connected to the second inputs of the first and the second differential amplifiers of mismatch signal. The first and the second outputs of the first and second differential amplifiers of mismatch signals are connected to the inputs of amplifiers, the outputs of amplifiers through the switches “on-off” are connected to the piezoelectric motors of power magnetic pushers. Improved spindle bearing is energy saving due to absence of gas consumption for bearing blow.