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US 12,549,073 B2Granted
Two-phase liquid-cooled alternating current (AC) rotating electrical machine
AssigneeRaytheon Company
InventorStephen B. Kuznetsov
Life of this patent
Estimating the term…
Abstract
A two-phased liquid-cooled AC rotating electrical includes a plurality of cooling circuits that recirculate and transition respective engineered liquids between liquid and vapor states around closed-loop fluid paths to cool a plurality of machine components e.g., hollow conductor rotor and stator windings and a magnetic stator core. A portion of each fluid path is either integrated with or in thermal contact with its component. The engineered liquids are evaporated within the respective portions of the fluid paths to hold the operating temperatures at or near the respective and different phase transition temperatures.
Claims16
A two-phase liquid-cooled alternating current (AC) rotating electrical machine, comprising:
- a wound field electric machine including a rotor in which a hollow conductor rotor winding is wound around a ferromagnetic material and a stator including one or more hollow conductor stator windings supported by a magnetic stator core, said rotor configured to rotate about a central axis of the stator;
- a first cooling circuit including a first closed-loop fluid path in which a first engineered liquid selected from fluorinated ketones (FKs), hydrofluoroethers (HFEs), perfluorocarbons (PFCs), hydrofluorocarbons (HFCs), perfluorohexans (PFHs), perfluoropolyether (PFPEs) and chlorofluorocarbons (CFCs) is recirculated through the hollow conductor rotor winding, wherein the first engineered liquid is evaporated at a first phase transition temperature within the hollow conductor rotor winding to cool the hollow conductor rotor winding and hold its operating temperature at or near the first phase transition temperature;
- a second cooling circuit including a second closed-loop fluid path in which a second engineered liquid selected from FKs, HFEs, PFCs, HFCs, PFHs, PFPEs and CFCs is recirculated through the one or more hollow conductor stator windings, wherein the second engineered liquid is evaporated at a second phase transition temperature within the one or more stator windings to cool the one or more hollow conductor stator windings and hold its operating temperature at or near the second phase transition temperature;
- wherein said first and second engineered liquids exhibit different first and second phase transition temperatures and different heats of vaporization;
- a third cooling circuit including a third closed-loop fluid path in which a third engineered liquid selected from FKs, HFEs, PFCs, HFCs, PFHs, PFPEs and CFCs is recirculated around the magnetic stator core, wherein the third engineered liquid is evaporated at a third phase transition temperature to cool the magnetic stator core and hold its operating temperature at or near the third phase transition temperature, which differs from the first and second phase transition temperatures and heats of vaporization.
2 more elements
A two-phase liquid-cooled alternating current (AC) rotating electrical machine, comprising:
- a wound field electric machine including a rotor in which a hollow conductor rotor winding is wound around a ferromagnetic material and a stator including one or more hollow conductor stator windings supported by a magnetic stator core, said rotor configured to rotate about a central axis of the stator;
- a first cooling circuit including a first closed-loop fluid path in which a first engineered liquid selected from fluorinated ketones (FKs), hydrofluoroethers (HFEs), perfluorocarbons (PFCs), hydrofluorocarbons (HFCs), perfluorohexans (PFHs), perfluoropolyether (PFPEs) and chlorofluorocarbons (CFCs) is recirculated through the hollow conductor rotor winding, wherein the first engineered liquid is evaporated at a first phase transition temperature within the hollow conductor rotor winding to cool the hollow conductor rotor winding and hold its operating temperature at or near the first phase transition temperature;
- a second cooling circuit including a second closed-loop fluid path in which a second engineered liquid selected from FKs, HFEs, PFCs, HFCs, PFHs, PFPEs and CFCs is recirculated through the one or more hollow conductor stator windings, wherein the second engineered liquid is evaporated at a second phase transition temperature within the one or more stator windings to cool the one or more hollow conductor stator windings and hold its operating temperature at or near the second phase transition temperature;
- wherein said first and second engineered liquids exhibit different first and second phase transition temperatures and different heats of vaporization;
- wherein the magnetic stator core is connected in series with the hollow core stator winding in the second closed-loop fluid path such that the second engineered liquid vaporizes in the hollow conductor stator winding, wherein the magnetic stator core is cooled by one of a vaporization of a remaining portion of the second engineered liquid or an increase in temperature of the second engineered liquid in either its liquid or vaporized state.
2 more elements
A two-phase liquid-cooled alternating current (AC) rotating electrical machine, comprising:
- An electric machine including a rotor that provides a magnetic field and a stator including one or more hollow conductor stator windings supported by a magnetic stator core, said rotor configured to rotate about a central axis of the stator;
- a first cooling circuit including a first closed-loop fluid path in which a first engineered liquid selected from fluorinated ketones (FKs), hydrofluoroethers (HFEs), perfluorocarbons (PFCs), hydrofluorocarbons (HFCs), perfluorohexans (PFHs), perfluoropolyether (PFPEs) and chlorofluorocarbons (CFCs) is recirculated around the magnetic stator core, wherein the first engineered liquid is evaporated at a first phase transition temperature to cool the magnetic stator core and hold its operating temperature at or near the first phase transition temperature;
- a second cooling circuit including a second closed-loop fluid path in which a second engineered liquid selected from FKs, HFEs, PFCs, HFCs, PFHs, PFPEs and CFCs is recirculated through the one or more hollow conductor stator windings, wherein the second engineered liquid is evaporated at a second phase transition temperature within the one or more stator windings to cool the one or more hollow conductor stator windings and hold its operating temperature at or near the second phase transition temperature;
- wherein said first and second engineered liquids exhibit different first and second phase transition temperatures and different heats of vaporization.
1 more element
A two-phase liquid-cooled alternating current (AC) electrical machine, comprising:
- an electric machine including a rotor that provides a magnetic field and a stator including one or more hollow conductor stator windings supported by a magnetic stator core, said rotor configured to rotate about a central axis of the stator;
- and
- a cooling circuit including a closed-loop fluid path in which an engineered liquids selected from fluorinated ketones (FKs), hydrofluoroethers (HFEs), perfluorocarbons (PFCs), hydrofluorocarbons (HFCs), perfluorohexans (PFHs), perfluoropolyether (PFPEs) and chlorofluorocarbons (CFCs) is recirculated around the magnetic stator core and through the one or more hollow conductor stator windings, wherein the engineered liquid is evaporated at a phase transition temperature to cool at least one of the hollow conductor stator windings and hold its operating temperatures at or near the phase transition temperature and to cool the remaining hollow conductor stator windings and stator core;
- wherein the magnetic stator core is connected in series with the one or more hollow core stator windings in the closed-loop fluid path such that the engineered liquid vaporizes in the at least one hollow conductor stator winding, wherein the magnetic stator core is cooled by one of a vaporization of a remaining portion of the engineered liquid or an increase in temperature of the engineered liquid in either its liquid or vaporized state.
1 more element
Dependencies are inferred from the claim text.