Superconducting dynamoelectric machine having a liquid mental shield

Abstract From the Canadian patent

A superconducting synchronous motor or generator which utilizes separate radiation and damper shields around a superconducting field winding on the machine rotor. The damper shield includes a pair of concentrically disposed cylinders held in radial spaced relationship with each other by pillar type structural members. A liquid metal fills the space between the concentric cylinders and as the rotor including the cylinders, is accelerated to its operating speed, the liquid metal likewise will reach synchronous speed as a result of viscous drag between the liquid metal and the cylinder walls. During operation the rotor shield-, ing function is performed by the electrically conducting liquid …