Abstract: An electrical machine with cryogenic cooling has a hollow rotor filled with a coolant and comprising a superconducting winding provided with at least two supply leads being cooled. One of the supply leads is connected to a plus sign current-collecting means and is disposed in at least one cooling duct for cooling one end part of the hollow shaft of the rotor. The cooling ducts for cooling both end parts of the hollow shaft of the rotor are connected, via respective exhausting means for withdrawing the coolant from the rotor, with respective coolant collecting chambers. The other supply lead is coupled to a minus sign current-collecting means. The hollow shaft of the rotor is provided with a passage for feeding the coolant to the superconducting winding, said passage being connected with an inlet means for introducing the coolant to the rotor, the inlet means being disposed in one end part of the hollow shaft of the rotor.

Abstract: The invention relates to devices for checking the conditions of the coolant at the output of the coolant feed unit of an electrical machine with cryogenic cooling.The device for checking the condition of the coolant comprises a hollow rotor, in which cryogenic temperature is maintained. Located inside the hollow rotor at one end and coaxially with the rotor is a coolant feed unit having a stationary part made in the form of two coaxial tubes disposed with a gap with respect to each other and a movable part. One end of the coolant feed unit communicates with a coolant supply tank while the other end communicates with a coolant collecting chamber, which, in turn, communicates with a unit for transferring the coolant into a liquid coolant receiver tank disposed at the other end of the hollow rotor and made, identically to the unit, in the form of two coaxial tubes.

Abstract: A super-conductive cryogen-cooled electrical machine comprises a rotor disposed within a hollow stator with an annular gap which is evacuated and kept under vacuum by means of at least two shells furnished with ports and position concentrically with a clearance or gap therebetween. One of said shells is supported in a cantilevered fashion by the rotor on the end face thereof to be coaxial therewith and the other being supported in a cantilevered fashion by the stator on the end face thereof opposite said end face of the rotor. The ports in the rotor-supported shells are made so that their axes form an acute angle .alpha. with tangent lines drawn to the shell periphery from the points where the port axes intersect the shell envelope in the direction of the rotor rotation, while the ports in the stator supported shells are made so as to form, in a similar way, an angle .beta.=180.degree.-.alpha..

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: An electrical machine with cryogenic cooling, comprising a superconducting field winding rigidly fixed to the shaft of a hollow rotor. The rotor is filled with a coolant which flows from the cavity of said rotor through heat exchangers mounted on the end face portions of the rotor. The design of the proposed machine provides for an increased effectiveness of thermal isolation of the superconducting field winding.

Abstract: A device for delivering cryogen to a superconducting winding of a cryogen-cooled electrical machine comprising a pipe articulated along the axis of the electrical machine and intended to deliver cryogen. One end of said pipe is located in a rotary chamber which communicates through channels with the space of the electrical machine, and said space accommodating its superconducting winding. The said chamber accommodates a needle installed along the chamber axis, and the length of said needle is of sufficient length such that in the advanced position of said cryogen delivering pipe said needle reaches the end of the pipe.The layout of the electrical machine increases the reliability and effectiveness of the device for delivering cryogen to the superconducting winding, simplifies the design of the device and raises the efficiency of the electrical machine.

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.