Canned rotodynamic flow machine for a molten salt nuclear reactor and an active magnetic bearing for use in a flow machine for a molten salt nuclear reactor
AssigneeCopenhagen Atomics A/S
InventorsAslak Stubsgaard, Thomas Jam Pedersen, Thomas Steenberg
Life of this patent
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Abstract
A canned rotodynamic flow machine (1) configured for operating with a working fluid such as molten salt of a molten salt nuclear reactor. The stator windings are formed by one or more electrically conductive solid bars (12).
Claims15
A canned rotodynamic flow machine (1) configured for operating with a molten salt or a cover gas working fluid at temperatures above 500° C., said canned rotodynamic flow machine (1) comprising:
- an impeller (6) arranged in a volute (3), said volute (3) having an inlet (4) for said working fluid and an outlet (5) for said working fluid,
- an induction or reluctance motor or generator comprising:
- a stator (10), a rotor (8),
- a can (18) in the form of a containment shell which separates a working fluid area from a dry area containing the stator (10), with the rotor (8) arranged in the working fluid area, said rotor (8) being operably coupled to said impeller (6) by a shaft (7), said stator (10) comprising stator windings for inducing a magnetic field that penetrates the rotor (8), said stator windings being distributed in slots (11) arranged in said stator (10), wherein the part of the stator windings inside said slots (11) is formed by one or more electrically conductive solid stator bars (12),
- one or more active magnetic bearings supporting said shaft (7),
- wherein said one or more active magnetic bearings comprise:
- a bearing stator (110,210) and a bearing rotor (108, 208), said bearing stator (110, 210) comprising bearing stator windings for inducing a magnetic field that penetrates said bearing rotor (108, 208), said bearing stator windings being distributed in one or more slots (111, 211) arranged in said bearing stator (110,210),
- the part of the bearing stator windings inside said one or more slots (111, 211) being formed by one or more electrically conductive solid bearing bars (112, 212), said dry area containing the bearing stator (110, 210), with the bearing rotor (108, 208) arranged in the working fluid area.
An active magnetic bearing for use in a canned flow machine that operates with a working fluid, said active magnetic bearing being configured to operate in an environment having a temperature above 500° C., said active magnetic bearing comprising:
- a stator (110,210) and a rotor (108,208),
- said stator (110,210) comprising stator windings for inducing a magnetic field that penetrates said rotor (108,208),
- means (201, 202) for detecting the position of said rotor (108,208) in communication with a controller configured for controlling a current supply to said stator windings,
- said stator windings being distributed in one or more slots (111, 211) arranged in said stator (110,210),
- the part of the stator windings inside said one or more slots (111, 211) being formed by one or more electrically conductive solid bearing bars (112, 212),
- characterized by
- said solid bearing bars (112, 212) being positioned inside said slots (111, 211) by one or more spacers (113, 213) for electrically insulating said one or more electrically conductive solid bearing bars (112, 212) from said stator (110,210),
- a can (18), separating a working fluid area, from a dry area containing the stator (110,210), with the rotor (108, 208) arranged in the working fluid area.
Dependencies are inferred from the claim text.