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US 6,525,504 B1Granted
Method and device for controlling the magnetic flux in a rotating high voltage electric alternating current machine
AssigneeABB AB
InventorsJan-Anders Nygren, Bertil Berggren
Life of this patent
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Abstract
A rotating electric machine for direct connection to high-voltage networks, in which the magnetic circuit adapted for high voltage comprises a rotor, stator and main and auxiliary windings in operative relation. At least one of the windings is a conductor surrounded by a magnetically permeable, field confining insulation system.
Claims48
A high voltage rotating electric machine comprising a stator, a rotor opposing said stator, and
- at least two windings, wherein at least one of said windings comprises a main winding in the stator for direct connection to a power network for at least one of producing and consuming power and at least one of the windings comprises an auxiliary winding in the stator for controlling the magnetic flux in the machine, and wherein at least one of said windings further comprises a cable including at least one current-carrying conductor and a magnetically permeable, electric field confining insulating cover surround the conductor comprising an inner layer having semiconducting properties in electrical contact with the conductor, a solid insulating layer surrounding and being in intimate contact with the inner layer and an outer layer having semiconducting properties surrounding and being in intimate contact with the insulation layer, said cable forming at least one uninterrupted turn in the corresponding winding of the machine.
A high voltage rotating electric machine comprising:
- a stator;
- a rotor opposing the stator mounted for rotation relative to each other;
- a main winding for in the stator for connection to a power network;
- and
- an auxiliary winding in the stator for controlling the magnetic flux in the machine, at least one of said windings comprising a cable including at least one current-carrying conductor comprising at least one insulated element and at least one uninsulated cover including and being in intimate contact with an outer semiconducting layer surrounding the conductor and being in intimate contact therewith;
- said cable forming at least one uninterrupted turn in the corresponding winding of the machine.
3 more elements
A high voltage rotating electric machine comprising:
- a stator, and
- a rotor opposing said stator mounted for rotation relative to each other;
- a main winding in the stator for direct connection to a power network;
- and
- an auxiliary winding in the stator for controlling the magnetic flux in the machine, at least one of said windings comprising a cable including at least one current-carrying conductor and a magnetically permeable, electric field confining insulating cover surrounding the conductor, said cable forming at least one uninterrupted turn in the corresponding winding of the machine, and wherein the cover includes an inner layer surrounding the conductor having semiconducting properties and being in electrical contact with said conductor, a solid insulating layer surrounding the inner layer and being in intimate contact with the inner layer, and an outermost layer surrounding the insulating layer having semiconducting properties and being in intimate contact with the insulating layer, said inner and outermost layers for producing a corresponding equipotential, field confining surface.
2 more elements
Dependencies are inferred from the claim text.