Rotatable shaft bearing with electromagnetically controlled support impedance

A system for controlling shaft displacement within a support structure, the system comprising:

• a rotatable shaft;
• at least one bearing supporting the shaft, wherein the at least one bearing comprises an inner race rotatable along with the shaft and an outer race circumferentially surrounding the inner race;
• an electromagnet assembly positioned about the shaft along a longitudinal axis thereof;
• and
• a controller configured to detect a radial motion of the shaft and determine a corrective force to reduce the radial motion of, or a parameter related to, the shaft, the controller being configured to command the electromagnet assembly to generate the corrective force to act on the shaft,
• wherein the electromagnet assembly comprises a plurality of phases spaced circumferentially about the shaft, the controller being configured to command different phases of the electromagnet assembly to generate the corrective force so that a vector of the corrective force rotates about the longitudinal axis of the shaft.