Abstract: In a seal oil system utilized to supply oil to shaft seals of a generator for preventing pressurized gas inside the generator from escaping through an interface of the generator shaft and the generator frame, wherein seal oil is supplied to said seals via a main supply line at a predetermined pressure, the improvement comprising at least one differential pressure accumulator including a barrel having an upper inlet end and a lower outlet end, and a piston slidably mounted in said barrel and movable between said inlet end and said outlet end; a first chamber above said piston having liquid supplied thereto at a pressure equal to internal gas pressure of the generator; a second chamber below said piston charged with generator seal oil; and means for enabling said at least one accumulator to discharge generator seal oil to said main supply line upon temporary decrease in pressure in said main supply line.

Abstract: A superconducting single phase alternator is connected by a circuit breaker across the breech ends of a pair of conductive launching rails. At a predetermined point on the alternator voltage wave a projectile establishes a current path between the rails to initiate a transient, sinusoidal current pulse effective in accelerating the projectile along the rails. A switch is actuated in response to the projectile exiting the muzzle ends of the rails to impose a short circuit across the rails. The circuit breaker disconnects the alternator from the rails as the current pulse goes to zero. The system provides higher launcher efficiency and reduced muzzle flash with minimum barrel length penalty.

Abstract: In a seal oil system utilized to supply oil to shaft seals of a generator for preventing pressurized gas inside the generator from escaping through an interface of the generator shaft and the generator frame, wherein seal oil is supplied to said seals via a main supply line at a predetermined pressure, the improvement comprising at least one differential pressure accumulator including a barrel having an upper inlet end and a lower outlet end, and a piston slidably mounted in said barrel and movable between said inlet end and said outlet end; a first chamber above said piston having liquid supplied thereto at a pressure equal to internal gas pressure of the generator; a second chamber below said piston charged with generator seal oil; and means for enabling said at least one accumulator to discharge generator seal oil to said main supply line upon temporary decrease in pressure in said main supply line.

Abstract: Active compensation in the form of a pair of trim coils and passive compensation in the form of a solenoidal-shaped magnetic shunt are disclosed for shaping the magnetic field existing in the liquid metal current collector region of an acyclic generator such as to minimize the field component normal to the stator and rotor collector surfaces and thereby substantially eliminate the generation of circulating currents in the liquid metal medium.