ULTRA HIGH TEMPERATURE CIRCUIT COUPLING
First Claim
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1. A circuit coupling in a high temperature device with stable inductance throughout an operating temperature range, the circuit coupling comprising:
- a primary induction coil assembly comprising a laminated primary core with a Curie temperature exceeding a maximum of the operating temperature range around which a primary coil is wound which maintains electrical conductivity of itself and maintains electrical isolation from nearby conductors at temperatures in excess of the maximum of the operating temperature range;
a secondary induction coil assembly comprising a laminated secondary core with a Curie temperature exceeding a maximum of the operating temperature range around which a secondary coil is wound which maintains electrical conductivity and maintains electrical isolation from nearby conductors at temperatures in excess of the maximum of the operating temperature range; and
wherein the primary and secondary induction coil assemblies are disposed within the device in proximity to one another with an air gap distance there between effective to maintain an inductance of the circuit coupling to an inductance value stable within 10% throughout the operating temperature range from ambient to at least 250 degrees Celsius.
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Abstract
An inductance-stable ultra high temperature circuit coupling transformer (50) used to transmit and receive alternating current power and/or data signals (29″, 33″). Primary (30″) and secondary (34″) windings are formed on nanostructured laminated (31′) primary and secondary steel cores (32″) having a Curie temperature exceeding an ultra high operating temperature. The operating range can extend from ambient to 250° C. or to in excess of 550° C. or up to 700° C. with a change in inductance of less than 10% in various embodiments.
11 Citations
16 Claims
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1. A circuit coupling in a high temperature device with stable inductance throughout an operating temperature range, the circuit coupling comprising:
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a primary induction coil assembly comprising a laminated primary core with a Curie temperature exceeding a maximum of the operating temperature range around which a primary coil is wound which maintains electrical conductivity of itself and maintains electrical isolation from nearby conductors at temperatures in excess of the maximum of the operating temperature range; a secondary induction coil assembly comprising a laminated secondary core with a Curie temperature exceeding a maximum of the operating temperature range around which a secondary coil is wound which maintains electrical conductivity and maintains electrical isolation from nearby conductors at temperatures in excess of the maximum of the operating temperature range; and wherein the primary and secondary induction coil assemblies are disposed within the device in proximity to one another with an air gap distance there between effective to maintain an inductance of the circuit coupling to an inductance value stable within 10% throughout the operating temperature range from ambient to at least 250 degrees Celsius. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. In a gas turbine engine having first and second casing sections removably joined together along a joint during operation of the engine, a circuit coupling comprising:
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a primary side of an open core transformer attached to the first casing section proximate the joint and exposed to a range of temperatures from ambient to an operating temperature within the engine; a secondary side of the open core transformer attached to the second casing section proximate the joint and proximate the primary side of the transformer and exposed to the range of temperatures within the engine; and core portions of the open core transformer each comprising a plurality of laminae of a material with a Curie temperature exceeding a maximum of the range of temperatures, such that the circuit coupling exhibits an inductance variation when incorporated in an electrical circuit of less than 10% over the range of temperatures.
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16. In a gas turbine engine having a rotating component disposed within a stationary component and a sensor element disposed on the rotating component, a circuit coupling comprising:
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a primary side of an open core transformer attached to the rotating component and receiving a signal from the sensor element; a secondary side of the open core transformer attached to the stationary component; the primary side and the second side of the open core transformer periodically disposed in proximity to one another with an air gap distance there between during operation of the gas turbine engine for the transmission of the signal across the air gap; and a core portion of both the primary and secondary sides of the open core transformer comprising respective pluralities of laminae of a nanocrystalline steel material effective to maintain variation in inductance across the air gap distance to less than 10% from ambient to at least 250°
C.
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Specification
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Current AssigneeSiemens Energy Incorporated (Siemens AG)
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Original AssigneeSiemens Energy Incorporated (Siemens AG)
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InventorsMitchell, David J., Schillig, Cora, Waits, Rod, Kulkarni, Anand A.
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current60/796
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CPC Class CodesF02C 3/04 having a turbine driving a ...F02C 7/00 Features, components parts,...G01R 15/183 using transformers with a m...G01R 15/186 using current transformers ...H01F 38/14 Inductive couplings for wir...
