Abstract: A super-conductive, cryogenically-cooled electrical machine comprises a superconductive exciting winding located in a hollow rotor and a system for cooling the ends of the rotor shaft. The cooling agent is delivered from one end of said shaft to the rotor space through the axial passage of the shaft whose ends are made of at least two coaxial tubes secured together by threading. The cooling agent is removed through the clearances of said thread and such construction of the rotor shaft reduces heat influxes to the superconductive exciting winding at least threefold and lowers the weight-to-power ratio of the machine at least fivefold.

Abstract: A rotor of an electrical machine has a superconducting winding which is connected to a heat exchanger in the cavity of the rotor. The heat exchanger feeds coolant to and withdraws coolant from the rotor. A thermal/electromagnetic shield, radially spaced from the superconducting winding, is connected with a Ranque vortex tube disposed in the cavity of the rotor. The rotor also has power leads having cooling ducts connected to the Ranque vortex tube and to the coolant discharge line. In addition, the rotor has two reducer portions adjacent the superconducting winding, arranged in series along the axis of the rotor on either side of the superconducting winding and each having a cooling duct located in close proximity to the superconducting winding and connected to Ranque vortex tube. The outlets of the cooling ducts of the reducer portions are connected with the coolant discharge line.

Abstract: An electrical machine with cryogenic cooling having a superconducting exciting winding secured to the rotor shaft and accommodated in a cavity in the rotor filled with a coolant. At the places where the superconducting winding is secured to the rotor shaft, there are provided grooves which communicate with a channel for the supply of the coolant, extending along the axis of the shaft at one of its ends, and with a channel for the removal of the coolant, extending along the axis of the shaft at its opposite end. The coolant is removed from the rotor cavity through channels provided at both ends of the rotor shaft. The rotor shaft accounts for an improved thermal protection of the superconducting exciting winding which is cooled only by the liquid phase of the coolant at a temperature of about 4.5 K.

Abstract: A cryogenically cooled electrical machine comprises a superconducting field winding placed inside a hollow rotor surrounded by a cooled magnetic shield and a heat shield. The magnetic shield is arranged within the heat shield and is cooled by a coolant circulating in ducts made in the heat shield, the heat and magnetic shields being arranged within an evacuated space between the rotor and the shell of the electrical machine. This embodiment of the electrical machine makes it possible to increase the efficiency of thermal protection of the superconducting field winding.