WO2015122527A1 - 高周波トランス用磁心、及びその製造方法 - Google Patents
高周波トランス用磁心、及びその製造方法 Download PDFInfo
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- WO2015122527A1 WO2015122527A1 PCT/JP2015/054221 JP2015054221W WO2015122527A1 WO 2015122527 A1 WO2015122527 A1 WO 2015122527A1 JP 2015054221 W JP2015054221 W JP 2015054221W WO 2015122527 A1 WO2015122527 A1 WO 2015122527A1
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- alloy ribbon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/04—Cores, Yokes, or armatures made from strips or ribbons
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/25—Magnetic cores made from strips or ribbons
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
- H01F41/0226—Manufacturing of magnetic circuits made from strip(s) or ribbon(s) from amorphous ribbons
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/58—Structural electrical arrangements for semiconductor devices not otherwise provided for, e.g. in combination with batteries
- H01L23/64—Impedance arrangements
- H01L23/66—High-frequency adaptations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2223/00—Details relating to semiconductor or other solid state devices covered by the group H01L23/00
- H01L2223/58—Structural electrical arrangements for semiconductor devices not otherwise provided for
- H01L2223/64—Impedance arrangements
- H01L2223/66—High-frequency adaptations
- H01L2223/6661—High-frequency adaptations for passive devices
Definitions
- the present invention relates to a magnetic core for a high-frequency transformer that is particularly excellent for high-power applications and a method for manufacturing the same.
- Patent Document 1 describes a configuration in which an Fe-based nanocrystalline soft magnetic alloy ribbon is used for the magnetic core of a high-frequency power transformer.
- Patent Document 2 although not a high-frequency power transformer, there is a description of a magnetic core in which a gap is formed in a magnetic core for a high-frequency accelerating cavity using a Fe-based nanocrystalline soft magnetic alloy ribbon.
- Patent Document 2 discloses a thickness of 10 to 30 ⁇ m (Claim 3).
- the Fe-based nanocrystalline soft magnetic alloy ribbon is typically cast to a thickness exceeding 15 ⁇ m.
- Patent Document 3 describes a modification method by mechanically polishing or chemically polishing an amorphous alloy surface in order to improve magnetic properties. Specifically, it describes that the surface that is not in contact with the roll is polished to 1 ⁇ m or less, preferably 0.5 ⁇ m or less.
- the high frequency magnetic core is manufactured by winding and laminating an amorphous alloy ribbon for an Fe-based nanocrystalline alloy and then heat-treating it at a crystallization temperature or higher. At this time, since it is necessary to ensure insulation between the layers of the alloy ribbon, an insulating film is formed by applying and drying silica powder or alumina powder on one side of the continuously cast alloy ribbon, thereby forming the alloy thin film. It is common practice to increase the insulation between the belt layers.
- an Fe-based amorphous alloy for an Fe-based nanocrystalline alloy that has been conventionally produced with a thickness exceeding 15 ⁇ m.
- An alloy ribbon in which the ribbon was thinned to a thickness of about 13 ⁇ m was manufactured, an insulating film was formed, wound, and then subjected to heat treatment to form a nanocrystalline alloy, thereby producing a magnetic core.
- the magnetic core has a predetermined length Lr (for example, 200 m) after fixing one end of an alloy ribbon in which an insulating film made of silica powder is previously formed on one surface of the alloy ribbon to a cylindrical inner core made of an insulator such as resin. Are wound and laminated with a predetermined tension (for example, 15 N).
- Lr the DC electric resistance value Ru per unit length in the longitudinal direction of the alloy ribbon is obtained in advance.
- the insulation degree is ideally 100%. However, when the thickness of the alloy ribbon is about 18 ⁇ m, the silica insulation film is actually partially peeled off and missing, so that the adjacent alloy ribbon is removed. Since there is a part where they are partially contacted and short-circuited, the value is usually 80 to 90%.
- the insulation degree is less than 50%, and it is considered that electrical contact is frequently made between the layers of the alloy ribbons wound and laminated. It was.
- the insulation degree is less than 50%, not only the expected eddy current loss cannot be reduced, but also when used in an actual high frequency magnetic core, a high voltage is generated between the alloy ribbons, and the magnetic core is not short-circuited. Risk of damage.
- the alloy ribbon is manufactured by a single roll method, but the surface on which the projection having the crater-like depression is formed is the surface opposite to the surface in contact with the cooling roll (hereinafter referred to as roll contact surface). It was also found out.
- roll contact surface the opposite surface is referred to as a free surface.
- the present invention has been made in view of the above, and an object thereof is to provide a low-loss magnetic core for a high-frequency transformer and a method for manufacturing the same.
- the present inventor impairs the excellent magnetic properties of the original Fe-based nanocrystalline alloy by increasing the loss due to the crater-like protrusions generated on the free surface of the Fe-based amorphous alloy ribbon for the Fe-based nanocrystalline alloy.
- “blunting” is used to mean that the top of a crater-like protrusion is polished and smoothed, and is not limited to a specific shape or a specific surface condition. The same applies to the following.
- Magnetic core for high-frequency transformer is a magnetic core having a shape in which a Fe-based nanocrystalline alloy ribbon having a roll contact surface and a free surface by a single roll method is wound through an insulating layer, A protrusion having crater-like depressions is dispersed on the free surface of the Fe-based nanocrystalline alloy ribbon, and the protrusion is a magnetic core for a high-frequency transformer characterized in that its top is polished and blunted.
- the thickness of the Fe-based nanocrystalline alloy ribbon is preferably 10 to 15 ⁇ m.
- the present invention is a manufacturing method of a magnetic core for a high frequency transformer, (1) producing a Fe-based amorphous alloy ribbon for Fe-based nanocrystalline alloy ribbon by a single roll method; (2) a step of bringing a rotating circumferential surface of a cylindrical grindstone into contact with a free surface of the Fe-based amorphous alloy ribbon, and applying pressure polishing to a top portion of a protrusion having a crater-like depression dispersed on the free surface; , (3) forming an insulating layer on the free surface and / or roll contact surface of the Fe-based amorphous alloy ribbon; (4) A step of winding the Fe-based amorphous alloy ribbon on which the insulating layer is formed, (5) heat treating the wound Fe-based amorphous alloy ribbon to form a Fe-based nanocrystalline alloy ribbon by nanocrystallization; It is a manufacturing method of the magnetic core for high frequency transformers characterized by having.
- an increase in loss due to crater-like protrusions dispersed on the free surface of the Fe-based amorphous alloy ribbon for Fe-based nanocrystalline alloy can be suppressed, and a low-loss magnetic core can be provided.
- the Fe-based amorphous alloy ribbon used in the magnetic core for a high-frequency transformer of the present invention is an alloy ribbon having a nanocrystalline structure after crystallization heat treatment, and is produced by a single roll method.
- molten molten metal is discharged from a nozzle onto a cooling roll and rapidly cooled, and the alloy ribbon after solidification is peeled off from the cooling roll, thereby continuously casting.
- the thickness of the alloy ribbon By setting the thickness of the alloy ribbon to 15 ⁇ m or less, a large number of protrusions having crater-like depressions having a diameter of about 20 to 50 ⁇ m and a height of 5 to 10 ⁇ m are formed on the free surface side of the alloy ribbon.
- it is necessary to take measures such as reducing the discharge amount of the liquid from the nozzle or reducing the gap between the nozzle and the cooling roll. It is considered that air is easily trapped by changing the condition setting.
- FIG. 2 shows a cross-sectional photograph of the protrusion having the crater-like depression. Moreover, the top view photograph of the protrusion 5 is shown in FIG. All show the state where polishing blunting is not performed on the top of the protrusion.
- FIG. 5 shows a schematic diagram of the equipment for blunting the top of the protrusion 5 according to the present invention.
- the unwinding reel 11 is obtained by winding the Fe-based amorphous alloy ribbon 1 after casting by a single roll method.
- the take-up reel 12 is obtained by winding the alloy ribbon 1 that has undergone the polishing blunting process.
- the cylindrical grindstone 7 has a function of polishing and blunting the top of the protrusion 5 having a crater-like depression.
- the cleaner roll 8 has a function of removing polishing powder adhering to the surface of the alloy ribbon after the polishing is slowed down.
- the tension adjusting roll 9 applies a predetermined tension to the traveling alloy ribbon 1 so that appropriate polishing blunting is performed.
- a large number of guide rolls 10 are arranged at appropriate locations so that the alloy ribbon 1 can travel along a predetermined path.
- the Fe-based amorphous alloy ribbon 1 wound on the unwinding reel 11 is unwound while controlling the running with a plurality of guide rolls 10.
- the top of 5 can be blunted.
- polishing powder adheres to the surface of the alloy ribbon after polishing and blunting, it is preferable to remove the polishing powder with the cleaner roll 8.
- a cylindrical grindstone 7 (grinding wheel roll) is in contact with the entire width of the surface of the free surface 3 of the alloy ribbon 1 but is selected only at the top of the projection 5 having a crater-like depression by optimizing the tension. Therefore, only the top of the projection 5 having a crater-like depression can be polished and blunted almost selectively.
- the cylindrical whetstone 7 can be a cylindrical electrodeposited whetstone. It can be manufactured by performing Ni plating with a Ni plating solution in which diamond powder or CBN (cubic boron nitride) powder having a number # 50 to 15000 (particle diameter 297 to 1 ⁇ m) is mixed with a cylindrical base metal.
- CBN cubic boron nitride
- a grinding wheel electrodeposited with diamond powder or CBN powder of number # 1000 to # 1500 (particle diameter 15 to 10 ⁇ m) is used at a peripheral speed of 400 to Polishing at 600 m / min is preferred.
- the grindstone is excellent in productivity and preferable in terms of durability and resistance to clogging.
- FIG. 1 shows a cross-sectional photograph of a portion where the top of the protrusion 5 having a crater-like depression is polished and blunted under the above conditions.
- FIG. 3 shows a plan photograph of a portion where the top of the protrusion 5 is polished and blunted. When the top of the protrusion 5 is polished, the tip is blunted and becomes gentle. The degree of polishing can be determined as appropriate.
- the tip of the top of the protrusion 5 directly contacts the roll contact surface side of the alloy ribbon 1 laminated thereon, thereby reducing the probability of short-circuiting. it can. Thereby, for example, a sufficient insulation between the layers of the Fe-based nanocrystalline alloy ribbon having a thin thickness of 13 ⁇ m can be obtained. Further, even when the thickness is relatively large, such as 18 ⁇ m, the top of the protrusion 5 having a crater-like depression can be formed on the surface of the free surface 3, so that the polishing blunting treatment as in the present invention is effective.
- the thickness of the alloy ribbon is preferably 15 ⁇ m or less, more preferably 14 ⁇ m or less.
- the thickness is preferably 10 ⁇ m or more.
- the Fe-based amorphous alloy ribbon for the Fe-based nanocrystalline alloy ribbon according to the present invention is mainly composed of Fe and at least one element selected from Cu and Au, and Ti, V, Zr, Nb, Mo, Hf, A material containing at least one element selected from Ta and W as an essential element is suitable.
- the Fe—Cu—Nb—Si—B system disclosed in JP-B-4-4393 the Fe—Cu—Nb—Zr—Si—B system, the Fe—Cu—Nb—Zr—B system, Fe— Examples thereof include a Mo—B system, a Fe—Nb—B system, a Fe—Zr—B system, a Fe—Cu—Zr—B system, and a Fe—Nb—Al—Si—B system.
- These alloys become a soft magnetic alloy ribbon having a nanocrystalline structure in which a bcc-Fe solid solution crystal having an average particle diameter of 100 nm or less accounts for 50% or more of the structure by heat treatment at a temperature higher than the crystallization temperature.
- the alloy ribbon 1 with the top of the projection 5 shown in FIG. 3 polished and blunted is once wound around the take-up reel 12 after the abrasion powder is removed by the cleaner roll 8. After being wound up once, a processing step of applying the insulating layer 4 again is performed.
- the apparatus for forming the insulating layer 4 is preferably a roll coater such as a known gravure coater.
- the take-up reel 12 on which the alloy ribbon 1 is wound can be set on a roll coater as an unwinding reel, and the insulating layer 4 can be applied to the surface of the alloy ribbon 1.
- the interlayer insulating film is formed by applying and drying silica or alumina.
- the drying method is a method that can form an insulating film continuously with high efficiency.
- the alloy ribbon 1 is taken up on the take-up reel 12 again.
- the heat treatment described above is performed in this reel state, and a Fe-based nanocrystalline alloy ribbon is produced.
- the insulating layer may be formed on the roll contact surface 2.
- An insulating layer may be formed on both the roll contact surface 2 and the free surface 3. In consideration of cost and ease of processing, it is preferable to form only on the free surface 3.
- each of the central part and the three end parts in the width direction of the alloy ribbon at any place in the longitudinal direction When a total of 3 fields of view with a field size of 5 mm ⁇ 50 mm were observed with a metallographic microscope, 10 protrusions having crater-like depressions could be confirmed within the 3 fields of view.
- silica insulating film was applied.
- An alloy ribbon was passed through a liquid in which silica powder was suspended in IPA (isopropyl alcohol) and then dried to form a 1.5 to 3 ⁇ m silica insulating film on one side (free surface) of the alloy ribbon.
- IPA isopropyl alcohol
- the alloy ribbon on which the silica insulating film is formed is wound to produce a toroidal magnetic core having an inner diameter of 28 mm and an outer diameter of 45 mm, and a nanocrystalline alloy is obtained by holding at a maximum holding temperature of 580 ° C. for 20 minutes in a nitrogen atmosphere. Thereafter, two conductors each having a diameter of 0.5 mm were wound around the magnetic core one time, and the loss was measured under the conditions of a frequency of 100 kHz and an excitation magnetic flux density of 200 mT, which was 200 kW / m 3 .
- the alloy ribbon on which the silica insulating film is formed is wound to produce a toroidal magnetic core having an inner diameter of 245 mm, an outer diameter of 800 mm, and a height of 25 mm, which is a shape for an acceleration cavity, and a maximum holding temperature of 580 ° C. in a nitrogen atmosphere.
- ⁇ p ′ ⁇ Q ⁇ f value (GHz) can be obtained from Rp.
- the ⁇ p ′ ⁇ Q ⁇ f value is used as an index for comparing the magnetic core characteristics even when the magnetic core shapes such as the inner diameter and the outer diameter are different.
- Rp ⁇ 0 ⁇ t ⁇ ln (b / a) ⁇ p ′ ⁇ Q ⁇ f
- ⁇ 0 vacuum magnetic permeability
- t magnetic core height
- a magnetic core inner diameter
- b magnetic core outer diameter
- ⁇ p ′ real part of complex magnetic permeability in parallel equivalent circuit
- Q magnetic core Q value
- f Frequency.
- a high shunt impedance Rp that is, a high ⁇ p ′ ⁇ Q ⁇ f value is desirable.
- the ⁇ p ′ ⁇ Q ⁇ f value (GHz) at each frequency in the acceleration cavity magnetic core is 3.4 (0.5 MHz), 4.1 (1 MHz), 6.4 (5 MHz), 7 .6 (10 MHz).
- Comparative Example 2 After melting 40 kg of the alloy mass having the same composition as Comparative Example 1 above the melting point, the molten metal was discharged from the nozzle to the cooling roll so that the width was 25 mm and the thickness was 18 ⁇ m by the single roll method, and the alloy ribbon was formed. About 12,200 m was obtained.
- each of the central part and the three end parts in the width direction of the alloy ribbon at any place in the longitudinal direction When a total of 3 fields of view of 5 mm ⁇ 50 mm were observed with a metallographic microscope, only one protrusion having a crater-like depression could be confirmed in the three fields of view.
- the alloy ribbon was passed through the liquid in which IPA was suspended and then dried to form a 1.5 to 3 ⁇ m silica insulating film on one surface (free surface) of the alloy ribbon.
- a toroidal magnetic core was produced by the same method as in Comparative Example 1 and the loss was measured. As a result, it was 250 to 300 kW / m 3 .
- Example 1 Of the alloy ribbon 16,900 m produced in Comparative Example 1, 500 m was polished on a free surface with an apparatus equipped with a cylindrical grindstone (grinding roll) (# 1000) electrodeposited with diamond powder as shown in FIG. .
- the diameter of the cylindrical grindstone was 60 mm, and the number of revolutions was 2500 rpm. Accordingly, the peripheral speed is 450 m / min.
- the alloy ribbon was subjected to a tension of 30 N ⁇ m, and the distance between the cylindrical grindstone and the alloy ribbon was 4.2 mm (8 ° in angle conversion).
- FIG. 1 Of the alloy ribbon 16,900 m produced in Comparative Example 1, 500 m was polished on a free surface with an apparatus equipped with a cylindrical grindstone (grinding roll) (# 1000) electrodeposited with diamond powder as shown in FIG. .
- the diameter of the cylindrical grindstone was 60 mm, and the number of revolutions was 2500 rpm. Accordingly, the peripheral speed is 450 m / min.
- the alloy ribbon was
- FIG. 1 shows a result of observing a cross section of a portion where the top portion of the protrusion having a crater-like depression on the free surface is polished and blunted (after the abrasion powder is removed by the cleaner roll).
- FIG. 2 shows a cross section of a protrusion having a crater-shaped depression on the free surface before polishing blunting. Compared to FIG. 2, it can be seen that in FIG. 1, the tops of the protrusions having crater-like depressions on the surface are polished and blunted.
- a silica insulating film was formed in the same manner as in the comparative example, and then the length of 200 m was wound around a resin core having an inner diameter of 180 mm, and the insulation degree was evaluated to be 85%.
- the degree of insulation is more than twice that of Comparative Example 1 in which the top of the protrusion having a crater-like depression on the free surface is not polished or blunted.
- the thickness of the alloy ribbon is 18 ⁇ m, and it is only 2% lower than that of Comparative Example 2 in which there are almost no projections having crater-like depressions, and is almost equivalent.
- the alloy ribbon on which the silica insulating film described in Example 1 is formed, the alloy ribbon is wound to produce a toroidal core having an inner diameter of 245 mm, an outer diameter of 800 mm, and a height of 25 mm, which is a shape for an acceleration cavity. Then, after being made into a nanocrystalline alloy by holding at a maximum holding temperature of 580 ° C. for 30 minutes in a nitrogen atmosphere, the shunt impedance Rp at each frequency was measured in the same manner as in Comparative Example 1, and ⁇ p ′ ⁇ Q ⁇ f value (GHz) ) Was calculated. The ⁇ p ′ ⁇ Q ⁇ f value (GHz) at each frequency was 4.2 (0.5 MHz), 4.9 (1 MHz), 7.1 (5 MHz), and 8.4 (10 MHz).
- Example 1 when comparing the ⁇ p ′ ⁇ Q ⁇ f values, at a frequency of 0.5 MHz, Example 1 is 0.8 larger than Comparative Example 1 and 1.0 larger than Comparative Example 2. At a frequency of 1 MHz, Example 1 is 0.8 larger than Comparative Example 1 and 1.1 larger than Comparative Example 2. At a frequency of 5 MHz, Example 1 is 1.1 larger than Comparative Example 1 and 1.3 larger than Comparative Example 2. At a frequency of 10 MHz, Example 1 is 0.8 larger than Comparative Example 1 and 1.2 larger than Comparative Example 2. It was confirmed that the relatively large ⁇ p ′ ⁇ Q ⁇ f value (GHz) showed excellent characteristics in actual high-frequency accelerated cavity applications.
- GHz ⁇ p ′ ⁇ Q ⁇ f value
- Example 1 is an apparatus provided with a cylindrical grindstone (grinding wheel roll) (# 1000), in which the top of a protrusion having a crater-like depression on the free surface is polished.
- a crater-like depression is obtained.
- the cylindrical grindstone electrodeposited with # 400 diamond powder was used.
- a toroidal magnetic core was produced in the same manner as in Comparative Example 1 and the loss was measured. As a result, it was 194 to 198 kW / m 3 . Therefore, it was confirmed that when the entire surface was polished, the loss was increased by about 15% as compared with the case where only the top of the protrusion having a crater-like depression was polished.
- the cause of the increase in loss is that the surface state of the alloy ribbon free surface is changed, so that the silica insulating film is easily peeled off, and the insulating properties between the layers are deteriorated.
Abstract
Description
本発明は、単ロール法によるロール接触面と自由面とを有するFe基ナノ結晶合金薄帯が絶縁層を介して巻回された形状を有する磁心であって、前記Fe基ナノ結晶合金薄帯における自由面には、クレーター状の窪みを有する突起が分散すると共に、前記突起は、その頂部が研磨され鈍化されていることを特徴とする高周波トランス用磁心である。
本発明は、高周波トランス用磁心の製造方法であって、
(1)単ロール法によるFe基ナノ結晶合金薄帯用Fe基アモルファス合金薄帯を作製する工程と、
(2)前記Fe基アモルファス合金薄帯の自由面に円柱状砥石の回転周面を接触させ、前記自由面に分散するクレーター状の窪みを有する突起の頂部を加圧研磨して鈍化する工程と、
(3)前記Fe基アモルファス合金薄帯の自由面及び/またはロール接触面に絶縁層を形成する工程と、
(4)前記絶縁層が形成されたFe基アモルファス合金薄帯を巻回する工程、
(5)前記巻回されたFe基アモルファス合金薄帯を熱処理し、ナノ結晶化させてFe基ナノ結晶合金薄帯とする工程と、
を有することを特徴とする高周波トランス用磁心の製造方法である。
原子%でCu:1%、Nb:3%、Si:15.5%、B:6.5%、残部Fe及び不可避不純物からなる合金溶湯(合金質量40kg)を単ロ-ル法により急冷し、幅25mm、厚さ13μmのFe基アモルファス合金薄帯を、約17,000m得た。
ここで、μ0:真空の透磁率、t:磁心高さ、a:磁心内径、b:磁心外径、μp’:並列等価回路での複素透磁率実数部、Q:磁心のQ値、f:周波数、である。
比較例1と同組成の合金質量40kgを融点以上で溶融した後、単ロール法により、幅25mm、厚さ18μmになるように、溶融金属をノズルから冷却ロールに吐出させて、合金薄帯を、約12,200m得た。
前記比較例1で作製した合金薄帯16,900mの内、500mについて、図5に示すダイヤモンド粉を電着した円柱状砥石(砥石ロール)(#1000)を備える装置で、自由面を研磨した。円柱状砥石の直径は60mmであり、回転数は毎分2500回転で行った。従って、周速は、450m/分となる。また、合金薄帯には、30N・mの張力がかかる状態で、円柱状砥石と合金薄帯の接する距離は4.2mm(角度換算で8°)で行った。自由面のクレーター状の窪みを有する突起の頂部が研磨、鈍化された部分(クリーナーロールにより磨耗粉が除去された後)の断面を観察した結果を図1に示す。図2には、研磨鈍化前の自由面のクレーター状の窪みを有する突起の断面を示す。図2に比べて、図1では表面のクレーター状の窪みを有する突起の頂部が研磨、鈍化されていることが分かる。
実施例1は、円柱状砥石(砥石ロール)(#1000)を備える装置で、自由面のクレーター状の窪みを有する突起の頂部を研磨したものであるが、比較例3では、クレーター状の窪みを有する突起の頂部だけでなく、自由面を全面研磨した。ただし比較例3では、#1000の円柱状砥石では目詰まりにより、全面を研磨できなかったため、♯400のダイヤモンド粉を電着した円柱状砥石を用いた。比較例1と同様の方法でトロイダル磁心を作製し、損失を測定したところ、194~198kW/m3であった。従って、全面研磨をすると、クレーター状の窪みを有する突起の頂部のみを研磨した場合に比べて、損失が約15%大きくなることが確認された。
2 ロール接触面
3 自由面
4 シリカ絶縁膜
5 クレーター状の窪みを有する突起
6 研磨鈍化部分
7 円柱状砥石(砥石ロール)
8 クリーナーロール
9 張力調整ロール
10 ガイドロール
11 巻出しリール
12 巻取りリール
Claims (3)
- 単ロール法によるロール接触面と自由面とを有するFe基ナノ結晶合金薄帯が絶縁層を介して巻回された形状を有する磁心であって、前記Fe基ナノ結晶合金薄帯における自由面には、クレーター状の窪みを有する突起が分散すると共に、前記突起は、その頂部が研磨され鈍化されていることを特徴とする高周波トランス用磁心。
- 請求項1に記載の磁心であって、前記Fe基ナノ結晶合金薄帯の厚さが10~15μmであることを特徴とする高周波トランス用磁心。
- 請求項1または2に記載の磁心の製造方法であって、
(1)単ロール法によるFe基ナノ結晶合金薄帯用Fe基アモルファス合金薄帯を作製する工程と、
(2)前記Fe基アモルファス合金薄帯の自由面に円柱状砥石の回転周面を接触させ、前記自由面に分散するクレーター状の窪みを有する突起の頂部を加圧研磨して鈍化する工程と、
(3)前記Fe基アモルファス合金薄帯の自由面及び/またはロール接触面に絶縁層を形成する工程と、
(4)前記絶縁層が形成されたFe基アモルファス合金薄帯を巻回する工程、
(5)前記巻回されたFe基アモルファス合金薄帯を熱処理し、ナノ結晶化させてFe基ナノ結晶合金薄帯とする工程と、
を有することを特徴とする高周波トランス用磁心の製造方法。
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CN201580009113.0A CN106030732B (zh) | 2014-02-17 | 2015-02-17 | 高频变压器磁芯及其制造方法 |
JP2015562887A JP6478160B2 (ja) | 2014-02-17 | 2015-02-17 | 高周波トランス用磁心、及びその製造方法 |
EP15748496.5A EP3109872B1 (en) | 2014-02-17 | 2015-02-17 | Core for high-frequency transformer, and manufacturing method therefor |
US15/119,279 US20170011829A1 (en) | 2014-02-17 | 2015-02-17 | Core for high-frequency transformer, and manufacturing method therefor |
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EP (1) | EP3109872B1 (ja) |
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JP2015167228A (ja) * | 2014-02-17 | 2015-09-24 | 日立金属株式会社 | 高周波加速空胴用磁心、及びその製造方法 |
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CN110291601B (zh) * | 2017-06-21 | 2022-01-04 | 日立金属株式会社 | 卷绕磁芯的制造方法、及卷绕磁芯 |
CN107452494B (zh) * | 2017-07-28 | 2018-11-27 | 天津大学 | 实现多磁导率连续变化环形磁芯电感的装置及方法 |
EP3859756B1 (en) * | 2018-09-26 | 2023-08-09 | Proterial, Ltd. | Method for manufacturing fe-based nanocrystalline alloy ribbon and an fe-based nanocrystalline alloy ribbon |
US11688551B2 (en) * | 2020-01-24 | 2023-06-27 | Toyota Jidosha Kabushiki Kaisha | Method for producing metal foils |
JP7375708B2 (ja) * | 2020-01-24 | 2023-11-08 | トヨタ自動車株式会社 | 金属箔の製造方法 |
CN113299452B (zh) * | 2021-07-27 | 2021-09-28 | 零八一电子集团四川力源电子有限公司 | 复合材料结构、磁芯本体及高压脉冲变压器用磁芯 |
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JPH01242755A (ja) * | 1988-03-23 | 1989-09-27 | Hitachi Metals Ltd | Fe基磁性合金 |
JP2000138099A (ja) * | 1998-08-25 | 2000-05-16 | Hitachi Metals Ltd | 高周波加速空胴用磁心およびこれを用いた高周波加速空胴 |
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JPS5739509A (en) * | 1980-08-21 | 1982-03-04 | Nippon Steel Corp | Moidification of amorphous electromagnetic material |
JP2001110647A (ja) * | 1999-10-13 | 2001-04-20 | Hitachi Metals Ltd | 高周波パワートランスおよびこれを用いた電力変換装置 |
US9290831B2 (en) * | 2009-09-14 | 2016-03-22 | Hitachi Metals, Ltd. | Soft-magnetic, amorphous alloy ribbon and its production method, and magnetic core constituted thereby |
KR101848725B1 (ko) * | 2013-07-30 | 2018-04-13 | 제이에프이 스틸 가부시키가이샤 | 철계 비정질 합금 박대 |
JP6481996B2 (ja) * | 2014-02-17 | 2019-03-13 | 日立金属株式会社 | 高周波加速空胴用磁心、及びその製造方法 |
-
2015
- 2015-02-17 JP JP2015562887A patent/JP6478160B2/ja active Active
- 2015-02-17 CN CN201580009113.0A patent/CN106030732B/zh active Active
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- 2015-02-17 EP EP15748496.5A patent/EP3109872B1/en active Active
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JPS61246318A (ja) * | 1985-04-24 | 1986-11-01 | Akai Electric Co Ltd | 非晶質磁性合金薄帯の表面性ならびに磁気特性改善方法 |
JPH01242755A (ja) * | 1988-03-23 | 1989-09-27 | Hitachi Metals Ltd | Fe基磁性合金 |
JP2000138099A (ja) * | 1998-08-25 | 2000-05-16 | Hitachi Metals Ltd | 高周波加速空胴用磁心およびこれを用いた高周波加速空胴 |
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JP2015167228A (ja) * | 2014-02-17 | 2015-09-24 | 日立金属株式会社 | 高周波加速空胴用磁心、及びその製造方法 |
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JPWO2015122527A1 (ja) | 2017-03-30 |
EP3109872B1 (en) | 2019-08-21 |
EP3109872A1 (en) | 2016-12-28 |
EP3109872A4 (en) | 2018-01-03 |
CN106030732A (zh) | 2016-10-12 |
US20170011829A1 (en) | 2017-01-12 |
JP6478160B2 (ja) | 2019-03-06 |
CN106030732B (zh) | 2018-09-04 |
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