An assembly comprises a shaft, and a support structure surrounding the shaft; and a magnetic seal system comprising an annular seal assembly including a ring sealingly mounted to a shaft to rotate therewith and slidingly axially displaceable along the shaft, and an annular seal supported by the ring. An annular magnet assembly is configured to be non-rotatingly supported adjacent to and surrounding the shaft, the annular magnet assembly configured and positioned relative to the ring to exert a sufficient attracting force on the ring to biasingly displace the ring axially along the shaft into sealing contact with the magnet. A cooling fluid feeding conduit, a cooling fluid exhaust conduit distinct from the cooling fluid feeding conduit are provided. An annular cavity is defined at least partially by or in a radially outer surface of the annular magnet, the annular cavity being in fluid communication with the cooling fluid feeding conduit, and with the cooling fluid exhaust conduit, for circulation of cooling fluid in the annular cavity.

A dynamic conformal aerodynamic seal that bridges the gap between an aircraft control surface and an aircraft wing, stabilizer or tail. The seal has a first edge and a second edge, where the first edge of the seal is rigidly coupled to the aircraft wing, stabilizer or tail and the second edge of the seal is slidably coupled to the control surface by magnetic coupling so that when the control surface pivots relative to the aircraft wing, stabilizer or tail, the second edge of the seal slides along the control surface.

A method to control an axial separation between a rotating ring and a stationary ring of a dry gas seal. The dry gas seal restricts leakage of a gas or other fluid to or from a rotating device. At least one property of the gas or other fluid is sensed. At least one of the axial separation between the rotating ring and the stationary ring, and a time rate of change of the axial separation, is sensed. A stiffness of a film between the rotating ring and the stationary ring is estimated. A field strength of at least one magnetic device is adjusted based on at least two of the sensed axial separation, the sensed time rate of change of the separation, and the estimated film stiffness. The axial separation between the rotating ring and the stationary ring is adjusted.