The SDS system only focuses on damping low frequency shaft rigid body and housing resonances and ignores higher frequencies, such as synchronous displacement, allowing the shaft to rotate about its mass center. This minimizes the SDS power and damping required during nominal operation. A SDS magnet is radially imbedded into the bearing shaft in conjunction with a passive radial bearing shaft magnet assembly. Each pole of the damper magnet is equipped with magnetically conductive pole shoes to ensure uniformity of the magnetic fields generated by the damper magnet around the rotor axis. A damper sleeve is installed over the outer diameters of the damper magnet, and the damper pole shoes to hold them in place, prevent relative motion during rotation and hermetically seal the magnet from the environment.
Whether for slow speeds for pumps or higher speeds for compressors, the radial passive magnetic bearings are fully compatible with the working fluids of an oil or gas well, can support a rotor in almost any environment and do not have any wear characteristics that impact the life of the bearing, making them the ideal non-contact bearings for all downhole applications.