WO2022224994A1 - 絶縁被覆導線 - Google Patents
絶縁被覆導線 Download PDFInfo
- Publication number
- WO2022224994A1 WO2022224994A1 PCT/JP2022/018314 JP2022018314W WO2022224994A1 WO 2022224994 A1 WO2022224994 A1 WO 2022224994A1 JP 2022018314 W JP2022018314 W JP 2022018314W WO 2022224994 A1 WO2022224994 A1 WO 2022224994A1
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- WIPO (PCT)
- Prior art keywords
- bonded
- insulated
- insulation
- braided
- insulating portion
- Prior art date
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- 238000009413 insulation Methods 0.000 claims abstract description 91
- 239000000919 ceramic Substances 0.000 claims abstract description 63
- 239000000835 fiber Substances 0.000 claims abstract description 39
- 230000001464 adherent effect Effects 0.000 claims abstract 4
- 239000004020 conductor Substances 0.000 claims description 128
- 239000000853 adhesive Substances 0.000 claims description 18
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 18
- 230000001070 adhesive effect Effects 0.000 claims description 17
- 230000015556 catabolic process Effects 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
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- 238000005979 thermal decomposition reaction Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 abstract description 15
- 238000009954 braiding Methods 0.000 abstract description 9
- 230000005291 magnetic effect Effects 0.000 description 54
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 4
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
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- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
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- 239000011733 molybdenum Substances 0.000 description 2
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- 235000012239 silicon dioxide Nutrition 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
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- 239000010937 tungsten Substances 0.000 description 2
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- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
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- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/12—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances ceramics
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
Definitions
- the present disclosure relates to insulated conductors.
- an electrostatic acceleration propulsion device such as a Hall thruster obtains thrust by electrically ejecting ions in plasma.
- electrostatic acceleration propulsion systems are easier to miniaturize, and provide high propulsion efficiency and high specific impulse. Therefore, the application of the electrostatic acceleration type propulsion machine to a propulsion machine suitable for trajectory control and attitude control of a spacecraft in outer space is being studied.
- Insulated coated conductors are used for magnetic field generating coils mounted on spacecraft propulsion devices such as Hall thrusters (hereinafter also referred to as spacecraft-mounted propulsion devices).
- spacecraft propulsion devices such as Hall thrusters (hereinafter also referred to as spacecraft-mounted propulsion devices).
- As the insulated conductor wire used for the magnetic field generating coil of the spacecraft propulsion device it is conceivable to apply a general insulated conductor wire having a ceramic insulation layer or a resin insulation layer on the outer circumference of the conductor wire.
- the spacecraft-mounted propulsion device may reach a temperature higher than the melting temperature of the resin insulation layer or higher than the thermal decomposition temperature.
- the resin insulation layer is denatured into a carbide, and is peeled off from the insulation-coated conductor or decomposed.
- the spacecraft-mounted propulsion device repeats temperature changes accompanied by large temperature differences from extremely low temperatures to high temperatures. Such temperature changes cause cracking of the ceramic insulating layer and peeling of the ceramic insulating layer from the insulation-coated conductor. When the resin insulation layer peels off and the ceramic insulation layer cracks in this manner, dielectric breakdown occurs starting from these defective portions.
- Patent Document 1 describes a coated conductor in which an insulating coating layer made of a braided body of ceramic fibers is formed on the outer periphery of an inner conductor, and an outer conductor made of a conductive fine wire is formed on the outer periphery of the insulating coating layer. ing.
- the coated conductor of Patent Document 1 does not contain organic material.
- the coated conductor of Patent Document 1 can avoid carbonization of the resin insulation layer as described above.
- the outer conductor formed on the outer periphery of the insulating coating layer has a shielding effect against electrical interference from the outside. If the coated conductor disclosed in Patent Document 1 is used as an insulated coated conductor for a magnetic field generating coil of a propulsion device mounted on a spacecraft, an induced current flows through this coated conductor and a magnetic field cannot be generated. Thus, it is difficult to apply the coated conductor of Patent Document 1 to the insulated coated conductor for the magnetic field generating coil.
- An object of the present disclosure is to provide an insulated coated conductor that is used in a magnetic field generating coil, has excellent insulation properties in a vacuum and at high temperatures, can be easily manufactured, and can be miniaturized and increased in output. is.
- the electrical resistivity of the conducting wire is 1 ⁇ 10 ⁇ 5 ⁇ cm or less at 25° C.
- an insulated coated conductor that is used in a magnetic field generating coil, has excellent insulation properties under vacuum and at high temperatures, can be easily manufactured, and can be miniaturized and increased in output. can be done.
- FIG. 1 is a perspective view showing an example of an insulation-coated conductor according to an embodiment.
- FIG. 2 is an enlarged view of area a in FIG.
- FIG. 3 is an enlarged view of area b in FIG.
- FIG. 4 is a vertical cross-sectional view showing an example of the insulation-coated conductor wire of the embodiment.
- FIG. 5 is schematic which shows an example of the usage example of the insulation coating conductor of embodiment.
- the insulated conductor wire used for the generator coil has excellent insulation properties under vacuum and high temperature, and we have attempted to simplify the production, reduce the size, and increase the output.
- the insulated coated conducting wire 1 of the embodiment covers the conducting wire 10 and the outer circumference 10a of the conducting wire 10 without adhering, and a plurality of first ceramic fibers 21 composed of a plurality of first ceramic strands 22 are adhered to each other.
- the non-bonded horizontally wound insulating portion 20 formed by winding horizontally in the extending direction of the conductor 10 without bonding with an adhesive or the like, and the outer circumference 20a of the non-bonded horizontally wound insulating portion 20 are bonded with an adhesive or the like.
- a non-bonded braided insulating portion 30 formed by braiding a plurality of second ceramic fibers 31 composed of a plurality of second ceramic strands 32 in close contact with each other without bonding.
- FIG. 1 is a perspective view showing an example of an insulated conductor according to an embodiment.
- FIG. 2 is an enlarged view of area a in FIG.
- FIG. 3 is an enlarged view of area b in FIG.
- FIG. 4 is a longitudinal sectional view showing an example of an insulated conductor.
- FIGS. 1 and 4 show the end of the insulated conductor 1 exposed by peeling off the non-bonded laterally wound insulating portion 20 and the non-bonded braided insulating portion 30 .
- the insulated coated conductor 1 of the embodiment includes a conductor 10, a non-bonded horizontal winding insulation portion 20, and a non-bonded braided insulation portion 30.
- a conductor 10 that constitutes the insulated conductor 1 extends along the central axis of the insulated conductor 1 .
- Conducting wire 10 is composed of at least one or more strands.
- the conducting wire 10 may be composed of a single wire, a twisted wire obtained by twisting a plurality of wires, or a bundled wire obtained by bundling a plurality of wires without twisting them.
- Conductor 10 may be compressed.
- the cross-sectional shape of the conductor wire 10 in a cross section perpendicular to the longitudinal direction of the insulated conductor wire 1 may be circular or flat.
- a conductor 10 is an inner conductor of the insulated conductor 1 .
- the material constituting the conductor 10 has a low electrical resistivity and a high melting temperature or Metallic materials with high sublimation temperature are preferred, copper-based materials including copper alloys such as copper and brass, aluminum-based materials including aluminum and aluminum alloys, molybdenum-based materials including molybdenum and molybdenum alloys, tungsten and tungsten alloys A tungsten-based material containing carbon nanotubes is preferred.
- the electrical resistivity of the conductive wire 10 is 1 ⁇ 10 ⁇ 5 ⁇ cm or less at 25° C. under a pressure of 100 Pa, and 1 ⁇ at a temperature 100° C. lower than the melting temperature or thermal decomposition temperature of the conductive wire 10 under a pressure of 100 Pa. It is preferably 10 ⁇ 5 ⁇ cm or less.
- the electric resistivity of the conducting wire 10 is within the above range, the insulated conducting wire 1 has excellent insulation properties under vacuum and high temperature, and can achieve high output with space saving and power saving.
- the wire diameter of the conducting wire 10 has a lower limit of preferably 0.25 mm or more, more preferably 0.60 mm or more, and an upper limit of preferably 1.00 mm or less, more preferably 0.90 mm or less.
- the insulation coated conducting wire 1 can be miniaturized. Therefore, the insulated coated conductor wire 1 can be suitably used for a magnetic field generating coil mounted on a propulsion device of a compact spacecraft.
- the non-bonded laterally wound insulating portion 20 that constitutes the insulation-coated conductor 1 covers the outer circumference 10 a of the conductor 10 .
- the non-bonded laterally wound insulating portion 20 is not bonded to the outer circumference 10 a of the conductor 10 .
- the non-bonded laterally wound insulating portion 20 has a cylindrical shape and covers the outer circumference 10 a of the conductor 10 along the longitudinal direction of the insulation-coated conductor 1 .
- a space S ⁇ b>1 exists between the outer circumference 10 a of the conductor 10 and the inner circumference 20 b of the non-bonded lateral winding insulating portion 20 .
- the non-bonded transversely-wound insulating portion 20 is formed by winding a plurality of first ceramic fibers 21 transversely in the extending direction of the conducting wire 10 without adhering and adhering them to each other.
- Each of the plurality of first ceramic fibers 21 is composed of a plurality of first ceramic strands 22 .
- non-bonded laterally wound insulating portion 20 is covered with the non-bonded braided insulating portion 30 from the outside, bonding between the conductor wire 10 and the non-bonded laterally wound insulating portion 20 and bonding between the plurality of first ceramic fibers 21 are not required. be.
- the space S1 exists between the outer circumference 10a of the conductor wire 10 and the inner circumference 20b of the non-bonded transversely wound insulating portion 20, and the non-bonded transversely wound insulating portion 20 is positioned relative to the outer circumference 10a of the conductor wire 10. do not adhere.
- the non-bonded laterally-wound insulating portion 20 of the insulation-coated conductor 1 is more sensitive to the thermal expansion of the conductor 10 and the heat of the non-bonded laterally-wound insulating portion 20.
- the insulated conductor 1 has excellent insulation properties under vacuum and high temperature.
- the insulated coated conductor 1 when the insulated coated conductor 1 is used in the air such as on the ground, the space S1 exists between the conductor 10 and the non-bonded laterally wound insulation portion 20, so compared to the conventional general insulated conductor Therefore, the insulating properties of the insulated conductor 1 are low. Therefore, when the insulated lead wire 1 is used in the air, the withstand voltage of the insulated lead wire 1 is restricted.
- the space S1 between the conductor 10 and the non-bonded laterally wound insulation portion 20 exhibits insulation, and thus functions as a gaseous insulation portion.
- the non-bonded laterally wound insulating portion 20 of the insulation coated conductor 1 has thermal expansion of the first ceramic fibers 21 and the effect of the adhesive. It is possible to suppress cracking of the non-bonded laterally wound insulating portion 20 due to a temperature change accompanied by a large temperature difference caused by a difference in thermal expansion. Therefore, the insulated conductor 1 has excellent insulation properties under vacuum and high temperature.
- the insulated coated conductor 1 when the insulated coated conductor 1 is used in the air, since the gaps G1 exist between the plurality of first ceramic fibers 21, the insulation of the insulated coated conductor 1 is improved compared to conventional general insulated conductors. characteristics are low. Therefore, when the insulated lead wire 1 is used in the air, the withstand voltage of the insulated lead wire 1 is restricted. Regarding the insulated coated conductor wire 1, in a vacuum such as outer space, the gaps G1 between the plurality of first ceramic fibers 21 exhibit insulating properties and thus function as gaseous insulating portions.
- the material constituting the non-bonded horizontal winding insulating part 20, that is, the first ceramic element Wire 22 is preferably a ceramic material of high electrical resistivity and high melting or sublimation temperature. More preferably, the ceramic material is a combination of silicon dioxide, aluminum trioxide, diboron trioxide, calcium oxide, and magnesium oxide, and may contain trace amounts of metal oxides.
- the plurality of first ceramic strands 22 forming the non-bonded horizontal winding insulating portion 20 may be made of the same type of ceramic material or different types of ceramic material. Silicon carbide (SiC) ceramics and the like are conceivable as a sublimating ceramics material.
- the electrical resistivity of the non-bonded laterally wound insulating portion 20 is 1 ⁇ 10 6 ⁇ cm or more at 25°C.
- the insulated coated conductor 1 has excellent insulation properties under vacuum and high temperature, and achieves high output with space saving and power saving. can be done.
- the non-bonded horizontally wound insulating portion 20 is not thermally decomposed even when held at a temperature of preferably 400°C or higher, more preferably 600°C or higher for a long time, for example, 1 hour. Since the non-bonded laterally wound insulating portion 20 is not thermally decomposed within the above temperature range, the insulating state by the non-bonded laterally wound insulating portion 20 can be maintained even when the temperature of the insulation-coated conductor 1 increases. Therefore, the insulated lead wire 1 has excellent insulation properties in a vacuum and at high temperatures, and can achieve high output while saving space and power.
- the lower limit of the thickness of the cylindrical non-bonded laterally wound insulating portion 20 is preferably 10 ⁇ m or more, more preferably 25 ⁇ m or more, and the upper limit is preferably 100 ⁇ m or less, more preferably 50 ⁇ m or less.
- the insulated coated conductor 1 has excellent insulation properties under vacuum and high temperature, and can achieve high output with space saving and power saving. can.
- the non-bonded laterally wound insulating portion 20 is formed by laterally winding a plurality of first ceramic fibers 21 around the outer periphery 10a of the conductor 10 without using an adhesive. Therefore, the non-bonded laterally wound insulating portion 20 can be easily manufactured. The smaller the number of layers of the non-bonded horizontally wound insulating portion 20, the more easily the non-bonded horizontally wound insulating portion 20 can be manufactured. 20 can be produced most conveniently.
- the non-bonded braided insulating portion 30 that constitutes the insulated coated conductor 1 covers the outer circumference 20a of the non-bonded laterally wound insulating portion 20 .
- the non-bonded braided insulating portion 30 is not bonded to the outer circumference 20 a of the non-bonded laterally wound insulating portion 20 .
- the non-bonded braided insulating portion 30 has a cylindrical shape and covers the outer periphery 20a of the non-bonded laterally wound insulating portion 20 along the longitudinal direction of the insulation-coated conductor 1 .
- a space S ⁇ b>2 exists between the outer circumference 20 a of the non-bonded laterally wound insulating portion 20 and the inner circumference 30 b of the non-bonded braided insulating portion 30 .
- the non-bonded braided insulating portion 30 is formed by braiding a plurality of second ceramic fibers 31 in close contact with each other and without bonding them in the extending direction of the conducting wire 10 .
- Each of the plurality of second ceramic fibers 31 is composed of a plurality of second ceramic strands 32 .
- the non-bonded braided insulating portion 30 is formed by braiding a plurality of second ceramic fibers 31 . It is possible to suppress the unbonded braided insulating portion 30 having a braided structure from collapsing as compared with an insulating portion having a braided structure such as a horizontal winding. Therefore, it is not necessary to bond the non-bonded laterally wound insulating portion 20 and the non-bonded braided insulating portion 30 and bond the plurality of second ceramic fibers 31 to each other.
- the space S2 exists between the outer periphery 20a of the non-bonded laterally wound insulating portion 20 and the inner periphery 30b of the non-bonded braided insulating portion 30, and the non-bonded braided insulating portion 30
- the outer periphery 20a of the insulating portion 20 is not adhered.
- the non-bonded braided insulation portion 30 of the insulation-coated conductor 1 is more susceptible to thermal expansion and non-bonding of the non-bonded horizontal-wound insulation portion 20 than the braided insulation portion bonded to the outer periphery 20a of the non-bonded horizontal-wound insulation portion 20 via an adhesive.
- the insulated conductor 1 has excellent insulation properties under vacuum and high temperature.
- the non-bonded braided insulating portion 30 is a braided structure formed by braiding a plurality of second ceramic fibers 31 .
- the non-bonded braided insulating portion 30, which is a braided structure, has good stretchability in the radial direction. Therefore, cracking of the non-bonded braided insulation portion 30 due to temperature change accompanied by a large temperature difference due to thermal expansion and contraction of the non-bonded braided insulation portion 30 can be suppressed.
- the space S2 exists between the non-bonded laterally wound insulating portion 20 and the non-bonded braided insulating portion 30, so that conventional general insulation
- the insulation properties of the insulated coated conductor 1 are lower than those of the coated conductor. Therefore, when the insulated lead wire 1 is used in the air, the withstand voltage of the insulated lead wire 1 is restricted.
- the space S2 between the non-bonded laterally wound insulating portion 20 and the non-bonded braided insulating portion 30 exhibits insulation, so it is used as a gaseous insulating portion. Function.
- gaps G2 exist between the plurality of second ceramic fibers 31, and the plurality of second ceramic fibers 31 do not adhere to each other.
- the non-bonded braided insulation portion 30 of the insulation coated conductor 1 has thermal expansion of the second ceramic fibers 31 and the thermal expansion of the adhesive. Cracking of the non-bonded braided insulating portion 30 due to a temperature change accompanied by a large temperature difference due to a difference between . Therefore, the insulated conductor 1 has excellent insulation properties under vacuum and high temperature.
- the insulated coated conductor 1 when the insulated coated conductor 1 is used in the air, since the gaps G2 exist between the plurality of second ceramic fibers 31, the insulation of the insulated coated conductor 1 is improved compared to conventional general insulated conductors. characteristics are low. Therefore, when the insulated lead wire 1 is used in the air, the withstand voltage of the insulated lead wire 1 is restricted. Regarding the insulated coated conductor wire 1, in a vacuum such as outer space, the gaps G2 between the plurality of second ceramic fibers 31 exhibit insulating properties and thus function as gaseous insulating portions.
- the material constituting the non-bonded braided insulating part 30, that is, the second ceramic strand has excellent insulating properties under vacuum and high temperature, and from the viewpoint of achieving high output with space saving and power saving.
- 32 is preferably a ceramic material with high electrical resistivity and high melting or sublimation temperature. More preferably, the ceramic material is a combination of silicon dioxide, aluminum trioxide, diboron trioxide, calcium oxide, and magnesium oxide, and may contain trace amounts of metal oxides.
- the plurality of second ceramic strands 32 forming the non-bonded horizontal winding insulating portion 30 may be made of the same type of ceramic material or different types of ceramic material.
- the electrical resistivity of the non-bonded braided insulating portion 30 is preferably 1 ⁇ 10 6 ⁇ cm or more at 25°C.
- the insulated coated conductor 1 has excellent insulation properties under vacuum and high temperature, and can achieve high output with space saving and power saving. can.
- the non-bonded braided insulation part 30 is not thermally decomposed even if it is held at a temperature of preferably 400°C or higher, more preferably 600°C or higher for a long time, for example, 1 hour. Since the non-bonded braided insulation portion 30 is not thermally decomposed within the above temperature range, the insulation state by the non-bonded braided insulation portion 30 can be maintained even when the temperature of the insulation-coated conductor 1 is increased. Therefore, the insulated lead wire 1 has excellent insulation properties in a vacuum and at high temperatures, and can achieve high output while saving space and power.
- the lower limit of the thickness of the cylindrical non-bonded braided insulating portion 30 is preferably 25 ⁇ m or more, more preferably 50 ⁇ m or more, and the upper limit is preferably 200 ⁇ m or less, more preferably 100 ⁇ m or less.
- the insulated coated conductor 1 has excellent insulation characteristics under vacuum and high temperature, and can achieve high output with space saving and power saving. .
- the non-bonded braided insulating portion 30 is formed by braiding a plurality of second ceramic fibers 31 around the outer periphery 20a of the non-bonded horizontally wound insulating portion 20 without using an adhesive. Therefore, the non-bonded braided insulating portion 30 can be easily manufactured.
- the combined electrical resistivity of the non-bonded laterally wound insulating portion 20 and the non-bonded braided insulating portion 30 is preferably 1 ⁇ 10 3 ⁇ cm or more at 25°C.
- the insulated coated conductor 1 has excellent insulation properties in a vacuum and at high temperatures, and can achieve high output while saving space and power.
- the insulated coated conductor 1 As described above, in the insulated coated conductor 1, the plurality of first ceramic fibers 21 are horizontally wound without using an adhesive to form the non-bonded horizontally wound insulating portion 20, and the plurality of The non-bonded braided insulating portion 30 is formed by braiding the second ceramic fibers 31 .
- the insulated coated conductor 1 can be manufactured.
- the non-bonded laterally wound insulating portion 20 covering the outer circumference 10a of the conductor 10 is a braided insulating portion, it is necessary to braid the braided insulating portion and the non-bonded braided insulating portion 30 respectively. Therefore, the manufacturing process is complicated compared to the insulated coated conductor 1 of the embodiment.
- the non-bonded braided insulating portion 30 is formed by braiding that does not require an adhesive. Therefore, the insulated coated conductor 1 can be manufactured easily.
- the outer circumference 30a of the non-bonded braided insulating portion 30 is not provided with a shielding portion made of a metal material. Therefore, miniaturization of the insulated coated conductor 1 can be achieved.
- the insulated coated conductor 1 does not include an organic material such as resin or rubber.
- the organic material is not formed on the outer circumference 20 a and the inner circumference 20 b of the non-bonded laterally wound insulating portion 20 and the outer circumference 30 a and the inner circumference 30 b of the non-bonded braided insulating portion 30 .
- the non-bonded laterally wound insulation portion 20 and the non-bonded braided insulation portion 30 are not impregnated with an organic material. Even if the temperature of the insulated conductor wire 1 rises, the members constituting the insulated conductor wire 1 are not decomposed, and defects such as cracks and peeling do not occur. Therefore, the insulated lead wire 1 has excellent insulation properties in a vacuum and at high temperatures, and can achieve high output while saving space and power.
- the AC dielectric breakdown voltage of the insulated lead wire 1 in a vacuum of 100 Pa or less is 400 V or more.
- the dielectric breakdown strength of the insulated coated conductor 1 is within the above range, it has excellent insulation properties in a vacuum and at high temperatures, so that it can be applied to a high-power magnetic field generating coil.
- the AC breakdown voltage of the insulation-coated conductor 1 is measured according to JIS C 3216-5 (2011).
- the insulated coated conductor 1 has excellent insulation properties under vacuum and high temperature, can be easily manufactured, and is preferably used for magnetic field generating coils that are required to be downsized and have high output.
- a magnetic field generating coil is preferably a magnetic field generating coil mounted on a propulsion device of a spacecraft.
- Hall thrusters, MPD thrusters, etc. which require space saving, power saving, and high output. It is suitably used for a magnetic field generating coil mounted on a propulsion machine that requires a large magnetic field.
- FIG. 5 is a schematic diagram showing an example of how the insulated conductor 1 of the embodiment is used.
- the insulated lead wire 1 can be used as an insulated lead wire for an external coil 58 and an insulated lead wire for an internal coil 59 mounted on a Hall thruster 40, which is a thruster of a spacecraft.
- the Hall thruster 40 is a propulsion machine for a spacecraft that generates a propulsion gas plasma and ejects ions in the plasma using an electric field to obtain thrust.
- the Hall thruster 40 comprises an annular channel 41 , an anode 44 , a cathode 45 , a propulsion gas feed 46 , a magnetic circuit 47 and a cover 51 .
- the annular channel 41 is the flow path for the propellant gas and its plasma, defined by concentric inner and outer walls 42, 43 about the axis Z.
- the inner peripheral wall 42 and the outer peripheral wall 43 comprise tubular structures centered about the Z axis and extending along the Z axis.
- the length of the annular channel 41 along the axis Z is shorter than the ion cyclotron radius and longer than the electron cyclotron radius. Also, the length of the annular channel 41 along the axis Z is substantially greater than the width of the annular channel 41 in the radial direction.
- An inner peripheral wall 42 and an outer peripheral wall 43 defining the annular channel 41 are made of ceramics such as boron nitride.
- the inner peripheral wall 42 and the outer peripheral wall 43 connect in front of the Hall thruster 40 (on the upstream side of the annular channel 41 ) to form a closed end 41 a that seals the annular channel 41 .
- the inner peripheral wall 42 and the outer peripheral wall 43 form an open end 41b of the annular channel 41 behind the Hall thruster 40 (downstream of the annular channel 41).
- the open end 41b functions as an outlet for the propellant gas and its plasma.
- the anode 44 is arranged at the closed end 41 a of the annular channel 41 .
- Anode 44 generates an ion accelerating electric field with cathode 45 through annular channel 41 .
- a supply passage 46 for propellant gas opens in the surface of the anode 44 facing the closed end 41a of the annular channel 41.
- the cathode 45 supplies electrons to the annular channel 41 and neutralizes plasma discharged from the open end 41 b of the annular channel 41 .
- a cathode circuit 54 is connected to the cathode 45 .
- An acceleration circuit 55 is connected in series between the anode 44 and the cathode 45 .
- the acceleration circuit 55 forms an acceleration electric field for ions directed from the front to the rear of the Hall thruster between the anode 44 and the cathode 45 via the annular channel 41 .
- the propellant gas supply passage 46 communicates with the closed end 41 a of the annular channel 41 to supply the propellant gas into the annular channel 41 .
- the propellant gas is a rare gas such as xenon or krypton, which is less corrosive and easily ionized.
- the magnetic circuit 47 includes an external magnetic pole 48, an internal magnetic pole 49, and a yoke 50.
- the outer magnetic pole 48, the inner magnetic pole 49, and the yoke 50 are made of ferromagnetic material such as iron.
- the external magnetic pole 48 is arranged radially outward of the outer peripheral wall 43 .
- An external coil 58 for generating a magnetic field is installed on the external magnetic pole 48 .
- An external coil 58 which is a magnetic field generating coil, is provided with an insulated conductor 1 .
- An excitation circuit 56 including a power source is connected to the external coil 58 to control the magnetic field generated by the external coil 58 .
- the internal magnetic pole 49 is arranged radially inward of the inner peripheral wall 42 .
- An internal coil 59 for generating a magnetic field is installed in the internal magnetic pole 49 .
- An internal coil 59 which is a magnetic field generating coil, is provided with an insulated conductor 1 .
- An excitation circuit 57 including a power supply is connected to the internal coil 59 to control the magnetic field generated by the internal coil 59 .
- the yoke 50 is provided on the closed end 41a side of the annular channel 41, contacts the outer magnetic pole 48 and the inner magnetic pole 49, and magnetically couples them.
- the external magnetic pole 48 and the internal magnetic pole 49 are magnetically coupled via the yoke 50 on the front side of the Hall thruster 40 .
- the outer magnetic pole 48 and the inner magnetic pole 49 are separated from each other through the annular channel 41 near the open end 41b of the annular channel 41 . Therefore, when a magnetic field is generated by the outer coil 58 and the inner coil 59 , the magnetic field couples through the yoke 50 while leaking into the annular channel 41 on the aft side of the Hall thruster 40 .
- the leaked magnetic field is distributed axisymmetrically and radially about the axis Z, causing electrons emitted from the cathode 45 to undergo cyclotron motion.
- the Hall thruster 40 has a cover 51 for the magnetic circuit 47 behind it.
- the cover 51 is exposed rearward of the Hall thruster 40 at a position exposed to plasma of the propellant gas.
- Such a cover 51 protects the outer magnetic pole 48 and the inner magnetic pole 49 from the plasma distributed near the open end 41 b of the annular channel 41 .
- the cover 51 has heat resistance and electrical conductivity.
- the cover 51 includes an annular portion 51a and a circular portion 51b.
- the annular portion 51 a of the cover 51 covers the end surface 48 a of the external magnetic pole 48 located on the open end 41 b side of the annular channel 41 .
- An insulating member 52 is provided between the annular portion 51 a of the cover 51 and the end face 48 a of the external magnetic pole 48 .
- the circular portion 51b of the cover 51 covers the end face 49a of the inner magnetic pole 49 located on the open end 41b side of the annular channel 41 via the insulating member 53 .
- the cover 51 is electrically floating.
- the positive side of the acceleration circuit 55 is connected to the anode 44 and the negative side of the acceleration circuit 55 is connected to the electron emitting member of the cathode 45 .
- Acceleration circuit 55 forms a predetermined acceleration electric field between anode 44 and cathode 45 .
- Acceleration circuit 55 is not electrically connected to excitation circuit 56 or excitation circuit 57 .
- the cover 51 Since the cover 51 is electrically floating, the potential of the cover 51 is negative with respect to the common of the Hall thruster 40 and the magnetic circuit 47 while plasma is generated. Electrons emitted from the cathode 45, on the other hand, traverse the cover 51 on their way to the anode 44 in the annular channel 41 by the accelerating electric field. Since the potential of the cover 51 is negative with respect to the common of the Hall thruster 40 and the magnetic circuit 47, electrons are less likely to collide with the cover 51 and have a higher probability of reaching the anode 44 or ions in the plasma.
- the insulated conductor 1 of the Hall thruster 40 having such a configuration is used for the external coil 58 and internal coil 59, which are magnetic field generating coils, as described above.
- the insulation-coated conductor wire 1 of the Hall thruster 40 has excellent insulation properties under vacuum and high temperature, and can achieve high output while saving space and power.
- the magnetic field generating coil can be realized by focusing on the knitted structure of the two types of insulating parts that cover the outer periphery of the conductor, the non-adhesive covering state of these insulating parts, and the non-use of organic materials. It is possible to obtain an insulated coated conductor that is used, has excellent insulating properties under vacuum and at high temperatures, can be easily manufactured, and is small in size and has a high output.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Insulated Conductors (AREA)
- Inorganic Insulating Materials (AREA)
Abstract
Description
[2] 前記導線の電気抵抗率は、100Paの圧力下において25℃で1×10-5Ωcm以下であり、かつ、100Paの圧力下において前記導線の融解温度または熱分解温度から100℃低い温度で1×10-5Ωcm以下である、上記[1]に記載の絶縁被覆導線。
[3] 前記非接着横巻絶縁部と前記非接着編組絶縁部との合成電気抵抗率は、25℃で1×103Ωcm以上である、上記[1]または[2]に記載の絶縁被覆導線。
[4] 100Pa以下の真空中における交流絶縁破壊電圧が400V以上である、上記[1]~[3]のいずれか1つに記載の絶縁被覆導線。
[5] 前記非接着横巻絶縁部および前記非接着編組絶縁部は、400℃以上で熱分解されない、上記[1]~[4]のいずれか1つに記載の絶縁被覆導線。
10 導線
10a 導線の外周
20 非接着横巻絶縁部
20a 非接着横巻絶縁部の外周
20b 非接着横巻絶縁部の内周
21 第1セラミックス繊維
22 第1セラミックス素線
30 非接着編組絶縁部
30a 非接着編組絶縁部の外周
30b 非接着編組絶縁部の内周
31 第2セラミックス繊維
32 第2セラミックス素線
40 ホールスラスタ
41 環状チャネル
41a 閉鎖端
41b 開口端
42 内周壁
43 外周壁
44 陽極
45 陰極
46 供給路
47 磁気回路
48 外部磁極
48a 端面
49 内部磁極
49a 端面
50 ヨーク
51 カバー
51a 環状部
51b 円状部
52、53 絶縁部材
54 陰極回路
55 加速回路
56 励磁回路
57 励磁回路
58 外部コイル
59 内部コイル
S1、S2 空間
G1、G2 空隙
Claims (5)
- 導線と、
前記導線の外周に対して接着せずに被覆し、複数の第1セラミックス素線から構成される複数の第1セラミックス繊維を互いに密着かつ接着せずに前記導線の延伸方向に対して横巻きしてなる非接着横巻絶縁部と、
前記非接着横巻絶縁部の外周に対して接着せずに被覆し、複数の第2セラミックス素線から構成される複数の第2セラミックス繊維を互いに密着かつ接着せずに編組してなる非接着編組絶縁部と
を備える、絶縁被覆導線。 - 前記導線の電気抵抗率は、100Paの圧力下において25℃で1×10-5Ωcm以下であり、かつ、100Paの圧力下において前記導線の融解温度または熱分解温度から100℃低い温度で1×10-5Ωcm以下である、請求項1に記載の絶縁被覆導線。
- 前記非接着横巻絶縁部と前記非接着編組絶縁部との合成電気抵抗率は、25℃で1×103Ωcm以上である、請求項1または2に記載の絶縁被覆導線。
- 100Pa以下の真空中における交流絶縁破壊電圧が400V以上である、請求項1~3のいずれか1項に記載の絶縁被覆導線。
- 前記非接着横巻絶縁部および前記非接着編組絶縁部は、400℃以上で熱分解されない、請求項1~4のいずれか1項に記載の絶縁被覆導線。
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Citations (3)
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JPS6280917A (ja) * | 1985-09-30 | 1987-04-14 | タツタ電線株式会社 | 不燃電線 |
JPH05282924A (ja) | 1992-03-30 | 1993-10-29 | Japan Atom Energy Res Inst | 被覆導体 |
JPH1021757A (ja) * | 1996-07-01 | 1998-01-23 | Yokogawa Denshi Kiki Kk | 耐熱電線およびその製造方法 |
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JPS6280917A (ja) * | 1985-09-30 | 1987-04-14 | タツタ電線株式会社 | 不燃電線 |
JPH05282924A (ja) | 1992-03-30 | 1993-10-29 | Japan Atom Energy Res Inst | 被覆導体 |
JPH1021757A (ja) * | 1996-07-01 | 1998-01-23 | Yokogawa Denshi Kiki Kk | 耐熱電線およびその製造方法 |
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