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US 4,058,746 AGranted
Dynamoelectric machinery utilizing superconductive windings
AssigneeWestinghouse Electric Corp.
InventorsCecil J. Mole, Robert F. Edwards
Life of this patent
Estimating the term…
Abstract
Iron or other ferromagnetic material is utilized in the magnetic circuit of dynamoelectric machines having superconductive field or excitation windings. In DC machines, a stationary salient pole field structure with a superconductive main field winding is utilized. An armature winding is wound about a smooth rotor. In AC machines, a ferromagnetic structure that encloses and rotates with a superconductive excitation winding is utilized. The ferromagnetic structure may include either salient poles interconnected by ferromagnetic shunts or a slotted or toothed rotor.
Claims38
In a dynamoelectric machine having a stator and a rotor, an improved field arrangement comprising:
- a superconductive field winding to produce magnetic flux;
- a salient pole ferromagnetic field structure formed to assist in distributing the magnetic flux produced by said superconductive field winding;
- and
- insulating means for thermally isolating said superconductive field winding from said salient pole ferromagnetic field structure and ambient conditions.
1 more element
A DC dynamoelectric machine comprising:
- a housing;
- a shaft mounted in said housing;
- a smooth rotor mounted on said shaft;
- an armature winding wound on said smooth rotor;
- a stationary salient pole ferromagnetic field structure surrounding said smooth rotor to aid in distributing magnetic flux in a desired fashion;
- a superconductive field winding to produce the magnetic flux which said salient pole ferromagnetic field structure aids in distributing;
- and
- insulating means for thermally isolating said superconductive winding from said salient pole ferromagnetic field structure.
5 more elements
An AC dynamoelectric machine comprising:
- a housing;
- a shaft mounted in said housing;
- a rotor mounted on said shaft, a first portion of said rotor comprising a superconductive field winding formed on a ferromagnetic core to provide a desired number of cryogenic magnetic poles;
- a second portion of said rotor comprising a salient pole ferromagnetic field structure completely surrounding said first portion;
- and
- insulating means for thermally isolating said first portion from said second portion of said rotor.
3 more elements
A dynamoelectric machine comprising:
- a housing;
- a shaft mounted in said housing;
- p1 a superconductive field winding mounted on said shaft for rotation therewith;
- insulating means for thermally isolating said superconductive field winding;
- a stator winding mounted in said housing;
- a structure of ferromagnetic material arranged to completely separate said superconductive field winding from said stator;
- and
- an auxiliary field winding wound on said structure of ferromagnetic material.
5 more elements
A DC dynamoelectric machine comprising:
- a generally cylindrical housing;
- a shaft mounted in said housing;
- a smooth cylindrical rotor mounted on said shaft;
- an armature winding wound about said smooth rotor;
- a salient pole ferromagnetic field structure having a plurality of ferromagnetic main field poles positioned about said smooth rotor, each of said main field poles having an outer neck portion and an inner head portion adjacent said smooth rotor, said head portion having a curved pole face adjacent said armature winding that covers a greater circumferential arc than does said neck portion;
- an auxiliary field winding wound about said neck portion of each of said main field poles;
- compensating windings located in the head portion of each of said main field poles;
- interpoles positioned between said main field poles, each of said interpoles having an outer neck portion and an inner head portion with a pole face of greater circumferential arc than does said neck portion;
- commutating windings placed about said neck portion of each of said interpoles;
- a stationary dewar vessel in the form of a cylindrical annulus located about said salient pole field structure, said dewar vessel comprising inner and outer insulating barriers, each of said barrier having concentric cylindrical walls forming a vacuum chamber therebetween;
- a thermal radiation shield located in each of said vacuum chambers;
- a plurality of cryogenic magnetic poles in said dewar vessel, each of said cryogenic magnetic poles positioned adjacent to a corresponding main field pole;
- a superconductive field winding placed about said cryogenic magnetic pole to produce magnetic flux;
- interpolar iron flux shunts located between said main field poles;
- and
- eddy current damper shields formed of conductive material included in the walls of said dewar vessel and in said radiation shield.
13 more elements
A DC dynamoelectric machine comprising:
- a generally cylindrical housing;
- a shaft mounted in said housing;
- a smooth cylindrical rotor mounted on said shaft;
- an armature winding formed about said smooth rotor;
- a salient pole ferromagnetic field structure comprising a cylindrical annulus of ferromagnetic material positioned about said smooth rotor and having a plurality of main field poles extending toward said smooth rotor therefrom, each of said main field poles having an arcuate trapezoidal cross-section with the equal length sides on radial lines extending from the central axis of the dynamoelectric machine, each of said main field poles having a first portion abutting said annulus of ferromagnetic material and bounded by the longer arcuate side and a second portion bounded by the shorter arcuate side and nearer said rotor than said first portion;
- a superconductive winding having a plurality of segments, each segment being wound about said first portion of an associated one of said main field poles;
- a dewar vessel having a radiation shield in the vacuum chamber thereof enclosing each of said segments of said superconductive winding;
- an auxiliary field winding wound about said second portion of each of said main field poles;
- compensating windings located in said second portion of each of said main field poles;
- interpoles positioned between said main field poles, each of said interpoles having an outer neck portion and an inner head portion with a pole face of greater circumferential arc than said neck portion adjacent said smooth rotor;
- commutating windings located about said neck portion of each of said interpoles;
- interpolar iron flux shunts located between said main field poles;
- and
- eddy current damper shields formed of conductive material included in the walls of said dewar vessel and in said radiation shield.
11 more elements
An AC dynamoelectric machine comprising:
- a generally cylindrical housing;
- a shaft mounted in said housing, said shaft having a reduced diameter portion within said housing;
- a ferromagnetic core rotatably mounted on said reduced diameter portion of said shaft;
- a superconductive field winding wound on said magnetic core in such a fashion as to produce a plurality of discrete cryogenic magnetic poles;
- flanges at either end of said reduced diameter portion of said shaft extending from said shaft a greater distance than the thickness of said ferromagnetic core;
- a cylindrical radiation shield having the ends thereof mounted on said flanges to form a first space between said ferromagnetic core with said superconductive field winding wound thereon and said radiation shield;
- a generally cylindrical rim of ferromagnetic material positioned about said radiation shield a distance therefrom to form a second space, said first and second spaces having the air pumped therefrom to form a vacuum and hence provide a dewar vessel for said superconductive field winding, said rim being mounted for rotation with said dewar vessel;
- a plurality of ferromagnetic main field poles integrally associated with said rim and extending therefrom, said main field poles being equal in number to said cryogenic magnetic poles and having a neck portion abutting said rim and a head portion at the other end thereof;
- eddy current damper shields formed of conductive material located on said radiation shield and said rim;
- damper starting windings located in said head portion of said main field poles;
- an auxiliary winding wound about said neck portion of each of said main field poles;
- a generally cylindrical stator core enclosing said rim and said extending main field poles and spaced therefrom;
- and
- a stator winding located in said stator core closely adjacent to said extending main field poles.
11 more elements
An AC dynamoelectric machine comprising:
- a generally cylindrical housing;
- a shaft mounted in said housing, said shaft having a reduced diameter portion within said housing;
- a ferromagnetic core rotatably mounted on said reduced diameter portion of said shaft;
- a superconductive field winding wound on said magnetic core in such a fashion as to produce a plurality of discrete cryogenic magnetic poles;
- flanges at either end of said reduced diameter portion of said shaft and extending from said shaft a greater distance than the thickness of said ferromagnetic core;
- a cylindrical radiation shield having the ends thereof mounted on said flanges to form a first space between said ferromagnetic core with said superconductive field winding wound thereon and said radiation shield;
- a generally cylindrical annulus of ferromagnetic material having slots formed therein and being positioned about said radiation shield a distance therefrom to form a second space, said first and second spaces having the air pumped therefrom to form a vacuum and hence provide a dewar vessel form said superconductive field winding, said annulus being mounted for rotation with said dewar vessel;
- eddy current damper shields formed of conductive material located on said radiation shield and said annulus;
- an induction winding wound in said slots of said annulus;
- a generally cylindrical stator core enclosing said annulus and spaced therefrom;
- and
- a stator winding located in said stator core closely adjacent to said annulus and separated therefrom by the air gap of the machine.
9 more elements
In an AC rotor adapted for both synchronous and asynchronous operation and having an armature and a field arrangement mounted for relative movement therebetween, an improved field arrangement comprising:
- an induction winding positioned adjacent the armature;
- a plurality of portions of ferromagnetic material;
- a superconductive field winding wound about said portions of ferromagnetic material to form a plurality of magnetic poles;
- insulating means thermally isolating said superconductive field winding from ambient conditions;
- first magnetic flux paths interconnecting adjacent poles during synchronous operation to provide main flux return paths;
- second magnetic flux paths interconnecting adjacent poles during asynchronous operation to shunt AC flux therebetween without penetrating said superconductive winding, said second flux path shunting a relatively small proportion of the magnetic flux between poles during synchronous operation;
- and
- means for preventing flux flow through said first flux path during asynchronous operation.
5 more elements
Dependencies are inferred from the claim text.