Superconductive AC dynamoelectric machines having two rotors

Claim 2

A superconductive AC dynamoelectric machine comprising: a stator having a stator winding located thereon; a first rotor connected to the drive shaft of the machine and mounted for rotation therewith, said first rotor having a first rotor winding located thereon; and a second rotor mounted for rotation and bearing a superconducting field winding designed to operate at cryogenic temperature located between said stator and said first rotor, said second rotor comprising a first shell adjacent said stator; and a second shell adjacent said first rotor, said first and second shells forming a chamber therebetween to contain said superconducting field winding and magnetic material forming magnetic poles.

Claim 3

A machine as claimed in claim 1 wherein said first rotor winding is a squirrel cage winding with both ends thereof shorted.

Claim 4

A machine as claimed in claim 1 wherein said first rotor is formed of magnetic material with one end connected to the drive shaft.

Claim 5

A machine as claimed in claim 1 wherein said superconducting field winding is enclosed in a dewar vessel separating it from said magnetic poles.

Claim 6

A machine as claimed in claim 1 wherein said first shell is constructed of electrically conductive material.

Claim 7

A machine as claimed in claim 1 wherein said first rotor winding is designed to operate near ambient temperature.

Claim 8

A superconductive AC dynamoelectric machine comprising: a housing; a generally cylindrical stator including an armature winding; a generally cylindrical first rotor including a first rotor winding; a first end plate integrally secured to one end of said first rotor; a drive shaft mounted for rotation, said drive shaft being affixed to said first end plate; a generally cylindrical second rotor located between said stator and said first rotor and including a superconducting field winding; a second end plate integrally Secured to one end of said second rotor; a support shaft mounted for rotation, said support shaft being affixed to said second end plate, said support shaft and said second end plate are adapted to convey refrigerant to said superconducting field winding; and said second rotor comprises a first shell adjacent said stator; and a second shell adjacent said first rotor, said first and second shells forming a chamber therebetween to contain said superconducting field winding enclosed in a dewar vessel and magnetic material forming magnetic poles.

Claim 9

A superconductive AC dynamoelectric machine comprising: a housing; a generally cylindrical stator including an armature winding; a generally cylindrical first rotor including a first rotor winding; a first end plate integrally secured to one end of said first rotor; a drive shaft mounted for rotation, said drive shaft being affixed to said first end plate; a generally cylindrical second rotor located between said stator and said first rotor and including a superconducting field winding; a second end plate integrally Secured to one end of said second rotor; a support shaft mounted for rotation, said support shaft being affixed to said second end plate, said support shaft and said second end plate are adapted to convey refrigerant to said superconducting field winding; and said second rotor comprises a first shell adjacent said stator; and a second shell adjacent said first rotor, said first and second shells forming a chamber therebetween to contain said superconducting field winding enclosed in a dewar vessel and magnetic material forming magnetic poles.

Claim 10

A machine as claimed in claim 7 wherein: said first rotor is concentric with said stator and located internally thereof; and said second rotor is concentric with said stator and said first rotor.

Claim 11

A machine as claimed in claim 7 wherein said second rotor further comprises a radially extending flange abutting said housing with a mounting permitting rotation of said flange with respect to said housing.