CN106952720B - Preparation method of cobalt-based amorphous iron core for magnetic amplifier - Google Patents
Preparation method of cobalt-based amorphous iron core for magnetic amplifier Download PDFInfo
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- CN106952720B CN106952720B CN201710110621.9A CN201710110621A CN106952720B CN 106952720 B CN106952720 B CN 106952720B CN 201710110621 A CN201710110621 A CN 201710110621A CN 106952720 B CN106952720 B CN 106952720B
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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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/04—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering with simultaneous application of supersonic waves, magnetic or electric fields
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
- H01F1/15316—Amorphous metallic alloys, e.g. glassy metals based on Co
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- Organic Chemistry (AREA)
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- Electromagnetism (AREA)
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Abstract
A method for preparing cobalt-based amorphous iron core for magnetic amplifier includes preparing belt by liquid quenching method, winding prepared cobalt-based amorphous belt material to be annular iron core, loading the annular iron core in heat treatment furnace under vacuum environment or high-purity argon protection environment or hydrogen protection environment, carrying out heat treatment in magnetic field, fixing the heat treated iron core in plastic protection box by normal temperature solidified silicon rubber or spraying epoxy resin on the iron core to complete preparation of cobalt-based amorphous iron core for magnetic amplifier. The iron core obtained by matching with the improved magnetic field heat treatment process has good squareness ratio and excellent loss characteristic, and can be widely applied to the choking coil of the magnetic amplifier.
Description
Technical Field
The invention mainly relates to the technical field of magnetic amplifiers, in particular to the technical field of cobalt-based amorphous iron cores for magnetic amplifiers.
Background
Magnetic amplifier control technology has become a quality reliability pronoun in the past 50Hz years, even in today's switching power supply applications. Today, magnetic amplifiers are mainly used in multi-output switching power supplies to control the output voltage. Push-pull forward converters with magnetic amplifier regulation and more recent buck converter principles have also been established.
In most power supplies, only one secondary output voltage is regulated in a closed loop by the primary voltage, and the other secondary output voltages are kept in an open loop state. The dynamic characteristics of these outputs are determined by the load and the primary switching voltage. To control the various output voltages independently of one another, different regulation principles are applied. Not only does the conventional linear regulator reduce conversion efficiency, but the output current is often limited to 1 or 2 amps. The regulator has higher price and poor reliability because it increases the circuit although it improves efficiency.
The magnetic amplifier regulation principle provides a low cost, efficient and reliable solution compared to linear regulators due to the simple design. It greatly meets the growing requirements for modern switching power supplies. Efficiencies of 90% or more can be achieved even at higher switching frequencies. Low Radio Frequency (RF) interference makes filtering more convenient.
The function of the magnetic amplifier can be described as a high-speed switch similar to a switching transistor. The rectangular B-H loop is associated with two operating states. As soon as the choke is magnetized, the switch is opened and no current can be output. Once the core material reaches saturation, the switch is turned on and current begins to be output. The core of the magnetic amplifier choke is a toroidal core made of soft magnetic alloy with a rectangular hysteresis loop. In most cases, only one set of coils is used for operation and control of the current. The specification requirements for the choke material are very high. In addition to low magnetic inversion loss (affecting thermal dispersion, controlling current, efficiency), a rectangular hysteresis loop featuring high coercivity (affecting the control range) and good saturation characteristics are also necessary. For this reason, a cobalt-based amorphous alloy core is accepted as an ideal material.
Therefore, how to manufacture a cobalt-based amorphous core for a magnetic amplifier having a good squareness ratio and excellent loss characteristics is an important issue of research currently being pursued by those in the art.
Disclosure of Invention
The invention provides a preparation method of a cobalt-based amorphous iron core for a magnetic amplifier, and the cobalt-based amorphous iron core for the magnetic amplifier prepared by the method has good squareness ratio and excellent loss characteristic.
The technical scheme adopted by the invention is as follows:
a preparation method of a cobalt-based amorphous iron core for a magnetic amplifier comprises the following steps:
(1) adopting a liquid quenching method to prepare the belt: quenching molten steel with the temperature of 1000-1400 ℃ by adopting a cooling roller with the roller surface linear speed of 20-50m/s to prepare a cobalt-based amorphous strip with the thickness of 20-28 mu m and the lamination coefficient of 0.75-0.89;
(2) winding an iron core: winding the cobalt-based amorphous strip into an annular iron core;
(3) carrying out heat treatment on the annular iron core: the annular iron core is put into a heat treatment furnace in a vacuum environment or an argon protection environment or a hydrogen protection environment for heat treatment: heating the annular iron core at a heating rate of 6-10 ℃/min for 50-70 min; after the temperature rise is finished, carrying out heat preservation treatment on the annular iron core, wherein the heat preservation time is 30-60min, and applying a longitudinal magnetic field to the annular iron core in the heat preservation treatment process, wherein the direction of the longitudinal magnetic field is arranged along the circumferential direction of the annular iron core, and the direction of the longitudinal magnetic field can be clockwise or anticlockwise; the magnetic field intensity of the longitudinal magnetic field is 0.8-20 KA/m; subsequently, the toroidal core is naturally cooled to room temperature.
The natural cooling of the annular iron core to the room temperature means that the annular iron core is naturally cooled to the room temperature in a vacuum environment, an argon protection environment or a hydrogen protection environment.
In order to protect the magnetic core with magnetic property after heat treatment, the preparation method can also comprise the step (4): the annular iron core is fixed in a plastic protection box by adopting normal temperature cured silicon rubber or sprayed on the annular iron core by adopting epoxy resin.
The cobalt-based amorphous iron core for the magnetic amplifier prepared by the method has the following magnetic properties:
core loss PFe65W/kg or less, measured with a sinusoidal drive voltage (f 50kHz) and a magnetic flux density amplitude B0.4T.
As can be seen from the above, the magnetic properties of the cobalt-based amorphous core for a magnetic amplifier manufactured by the above method were tested, and it was revealed that the core had a good squareness ratio and excellent loss characteristics.
In order to obtain a better magnetic core rectangular ratio, in the process of naturally cooling the annular iron core to the room temperature in the step (3), a longitudinal magnetic field is applied to the annular iron core, the magnetic field direction of the longitudinal magnetic field is arranged along the circumferential direction of the annular iron core, and the magnetic field strength of the longitudinal magnetic field is 0.8-20 KA/m.
The preparation width of the cobalt-based amorphous strip is 5mm, the outer diameter of the annular iron core is 19mm, and the inner diameter of the annular iron core is 15 mm.
The preparation width of the cobalt-based amorphous strip is 10mm, the outer diameter of the annular iron core is 25mm, and the inner diameter of the annular iron core is 20 mm.
The beneficial effects brought by the invention are as follows:
the cobalt-based amorphous iron core for the magnetic amplifier, which is prepared by matching the cobalt-based amorphous strip with the improved magnetic field heat treatment process, has a good squareness ratio and excellent loss characteristics, and can be widely applied to the choking coil of the magnetic amplifier.
Drawings
Fig. 1 is a static hysteresis chart obtained by measuring magnetic properties of an iron core in a first embodiment of the present invention;
fig. 2 is a static hysteresis chart obtained by measuring magnetic properties of the iron core in the second embodiment of the present invention.
Detailed Description
The first embodiment is as follows:
according to the preparation method of the cobalt-based amorphous iron core for the magnetic amplifier, the cobalt-based amorphous iron core for the magnetic amplifier is prepared by the following steps:
(1) adopting a liquid quenching method to prepare the belt: the roller speed is 20-50m/s, and the cooling speed is 106Quenching molten steel at the temperature of 1000-1400 ℃ by a cooling roller at the temperature of 1000/s to prepare a cobalt-based amorphous strip with the width of 5mm, the thickness of 20-28 mu m and the lamination coefficient of 0.75-0.89;
(2) winding an iron core: coiling the cobalt-based amorphous strip into an annular iron core with the outer diameter of 19mm and the inner diameter of 15 mm;
(3) carrying out heat treatment on the annular iron core: the annular iron core is put into a heat treatment furnace in a vacuum environment or an argon protection environment or a hydrogen protection environment for heat treatment: heating the annular iron core at a heating rate of 6-10 ℃/min for 50-70 min; after the temperature rise is finished, carrying out heat preservation treatment on the annular iron core, wherein the heat preservation time is 30-60min, and applying a longitudinal magnetic field to the annular iron core in the heat preservation treatment process, wherein the direction of the longitudinal magnetic field is arranged along the circumferential direction of the annular iron core (the direction of the longitudinal magnetic field can be clockwise or anticlockwise), and the magnetic field intensity of the longitudinal magnetic field is 0.8-20 KA/m; naturally cooling the annular iron core to room temperature;
(4) the annular iron core is fixed in a plastic protection box by adopting normal temperature cured silicon rubber or sprayed on the annular iron core by adopting epoxy resin.
The magnetic properties of the core of this example were tested and the static hysteresis loop of the core showed that the core had a good squareness ratio.
Further, in this embodiment, the time for applying the longitudinal magnetic field may be prolonged, that is, during the process of naturally cooling the annular iron core to room temperature in step (3), the longitudinal magnetic field is continuously applied to the annular iron core, and the magnetic field direction of the longitudinal magnetic field is set along the circumferential direction of the annular iron core, and the magnetic field strength of the longitudinal magnetic field is 0.8 to 20 KA/m.
Example two:
according to the preparation method of the cobalt-based amorphous iron core for the magnetic amplifier, the cobalt-based amorphous iron core for the magnetic amplifier is prepared by the following steps:
(1) adopting a liquid quenching method to prepare the belt: the roller speed is 20-50m/s, and the cooling speed is 106Quenching molten steel at the temperature of 1000-1400 ℃ by a cooling roller at/s to prepare a cobalt-based amorphous strip with the width of 10mm, the thickness of 20-28 mu m, the lamination coefficient of 0.75-0.89 and good toughness;
(2) winding an iron core: coiling the cobalt-based amorphous strip into an annular iron core with the outer diameter of 25mm and the inner diameter of 20 mm;
(3) carrying out heat treatment on the annular iron core: the annular iron core is put into a heat treatment furnace in a vacuum environment or a high-purity argon protection environment or a hydrogen protection environment for heat treatment: heating the annular iron core at a heating rate of 6-10 ℃/min for 50-70 min; after the temperature rise is finished, carrying out heat preservation treatment on the annular iron core, wherein the heat preservation time is 30-60min, and applying a longitudinal magnetic field to the annular iron core in the heat preservation treatment process, wherein the direction of the longitudinal magnetic field is arranged along the circumferential direction of the annular iron core, and the magnetic field intensity of the longitudinal magnetic field is 0.8-20 KA/m; naturally cooling the annular iron core to room temperature;
(4) the annular iron core is fixed in a plastic protection box by adopting normal temperature cured silicon rubber or sprayed on the annular iron core by adopting epoxy resin.
The magnetic properties of the core of this example were tested and the static hysteresis loop of the core showed that the core had a good squareness ratio.
Further, in this embodiment, the time for applying the longitudinal magnetic field may be prolonged, that is, during the process of naturally cooling the annular iron core to room temperature in step (3), the longitudinal magnetic field is continuously applied to the annular iron core, and the magnetic field direction of the longitudinal magnetic field is set along the circumferential direction of the annular iron core, and the magnetic field strength of the longitudinal magnetic field is 0.8 to 20 KA/m.
The above detailed description is specific to one possible embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A preparation method of a cobalt-based amorphous iron core for a magnetic amplifier is characterized by comprising the following steps: the method comprises the following steps:
(1) adopting a liquid quenching method to prepare the belt: quenching molten steel with the temperature of 1000-1400 ℃ by adopting a cooling roller with the roller surface linear speed of 20-50m/s to prepare a cobalt-based amorphous strip with the thickness of 20-28 mu m and the lamination coefficient of 0.75-0.89;
(2) winding an iron core: winding the cobalt-based amorphous strip into an annular iron core;
(3) carrying out heat treatment on the annular iron core: and (2) putting the annular iron core into a heat treatment furnace in a vacuum environment or an argon protection environment or a hydrogen protection environment for heat treatment: heating the annular iron core, wherein the heating rate is 6-10 ℃/min, and the heating time is 50-70 min; carrying out heat preservation treatment after the temperature rise is finished, wherein the heat preservation time is 30-60min, and applying a longitudinal magnetic field to the annular iron core in the heat preservation treatment process, wherein the direction of the longitudinal magnetic field is arranged along the circumferential direction of the annular iron core, and the magnetic field intensity of the longitudinal magnetic field is 0.8-20 KA/m; then, naturally cooling the annular iron core to room temperature; and in the process of naturally cooling the annular iron core to room temperature, applying a longitudinal magnetic field to the annular iron core, wherein the magnetic field direction of the longitudinal magnetic field is arranged along the circumferential direction of the annular iron core, and the magnetic field intensity of the longitudinal magnetic field is 0.8-20 KA/m.
2. The method for manufacturing a cobalt-based amorphous iron core for a magnetic amplifier according to claim 1, wherein: further comprising the step (4): and fixing the annular iron core in a plastic protection box by adopting normal-temperature cured silicon rubber or spraying epoxy resin on the annular iron core.
3. The method of manufacturing a cobalt-based amorphous iron core for a magnetic amplifier according to claim 1 or 2, characterized in that: the preparation width of the cobalt-based amorphous strip is 5mm, the outer diameter of the annular iron core is 19mm, and the inner diameter of the annular iron core is 15 mm.
4. The method of manufacturing a cobalt-based amorphous iron core for a magnetic amplifier according to claim 1 or 2, characterized in that: the preparation width of the cobalt-based amorphous strip is 10mm, the outer diameter of the annular iron core is 25mm, and the inner diameter of the annular iron core is 20 mm.
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| WO2002023560A1 (en) * | 2000-09-15 | 2002-03-21 | Vacuumschmelze Gmbh & Co. Kg | Half-cycle transductor with a magnetic core, use of half-cycle transductors and method for producing magnetic cores for half-cycle transductors |
| CN102360913A (en) * | 2011-07-27 | 2012-02-22 | 安徽芜湖君华科技材料有限责任公司 | Preparation method for novel amorphous transformer magnetic core |
| CN102761175A (en) * | 2012-07-20 | 2012-10-31 | 安泰科技股份有限公司 | Stator iron core for axial magnetic field, and manufacturing method thereof |
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| WO2016017578A1 (en) * | 2014-07-28 | 2016-02-04 | 日立金属株式会社 | Current transformer core, method for manufacturing same, and device equipped with said core |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103050210B (en) * | 2013-01-07 | 2016-04-27 | 钢铁研究总院 | A kind of amorphous soft magnet iron core and manufacture method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002023560A1 (en) * | 2000-09-15 | 2002-03-21 | Vacuumschmelze Gmbh & Co. Kg | Half-cycle transductor with a magnetic core, use of half-cycle transductors and method for producing magnetic cores for half-cycle transductors |
| CN102360913A (en) * | 2011-07-27 | 2012-02-22 | 安徽芜湖君华科技材料有限责任公司 | Preparation method for novel amorphous transformer magnetic core |
| CN102761175A (en) * | 2012-07-20 | 2012-10-31 | 安泰科技股份有限公司 | Stator iron core for axial magnetic field, and manufacturing method thereof |
| CN103334067A (en) * | 2013-05-31 | 2013-10-02 | 全椒君鸿软磁材料有限公司 | Ti-Ta-Hf system Fe-based amorphous alloy thin strip and preparation method therefor |
| WO2016017578A1 (en) * | 2014-07-28 | 2016-02-04 | 日立金属株式会社 | Current transformer core, method for manufacturing same, and device equipped with said core |
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Application publication date: 20170714 Assignee: Guangdong Yaoda Financial Leasing Co.,Ltd. Assignor: FOSHAN ZHONGYAN AMORPHOUS TECHNOLOGY Co.,Ltd. Contract record no.: X2021980004311 Denomination of invention: A preparation method of cobalt based amorphous core for magnetic amplifier Granted publication date: 20200501 License type: Exclusive License Record date: 20210602 |
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