Development and Experimental Investigation of New Seals for Cryoalternators
One of the vital problems in developing high-speed cryogenically cooled electrical machines with a cryostat common to rotor and stator is availability of reliable shaft seals. Depending on the electric machine design, reliable rotary seals are required both for working media sealing and for maintaining vacuum in rotating cryostats. Newly designed rotary seals employ the principles of radial hydrodynamic sealing. Tentative experimental studies proved the advantages of the new design over the traditional radial hydrodynamic seals. Pressure difference withstood by the new seals with no obvious sealed media leaks is about 1.5 times greater than that provided by a conventional seal.
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