CN1031848C - Production of amorphous magnetic core for magnetic-compensation Hall current sensor - Google Patents
Production of amorphous magnetic core for magnetic-compensation Hall current sensor Download PDFInfo
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- CN1031848C CN1031848C CN 91111757 CN91111757A CN1031848C CN 1031848 C CN1031848 C CN 1031848C CN 91111757 CN91111757 CN 91111757 CN 91111757 A CN91111757 A CN 91111757A CN 1031848 C CN1031848 C CN 1031848C
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Abstract
The present invention relates to a cutting magnetic core for a magnetic compensation type Hall current sensor. The constituents of the present invention are FezNiyMxSi7-10B12-5 (wherein M is Mo or Mn; X is from 0 to 5; y is from 0 to 40; z is from 36 to 78). The residual magnetism is reduced and the high-frequency characteristics are improved by special partial crystallization annealing or transverse magnetic field annealing, and semi-flexible epoxy resin is formed by packaging, solidification and cutting finally. Compared with the traditional permalloy magnetic core, the weight of the non-crystalline magnetic core of the present invention has the advantages of low raw material and manufacture cost, and easy manufacture. The present invention has good frequency characteristics and low residual magnetism and coercivity, and can improve the response time and the precision of the sensor.
Description
The invention belongs to novel soft magnetic core, the high magnetic permeability 80Ni-Fe that replaces original tradition to use is a permalloy material magnetic core, have extremely low remanence strength, low-coercivity and better frequency characteristic, the magnetic core of amorphous magnetic core specific adaptation of the present invention in magnetic compensation formula Hall current sensor.
Magnetic compensation formula Hall current sensor is a kind of high accuracy, noncontact, but the transducer of the various waveform electric currents of observing and controlling, and it is widely used in the emerging power electronic technology, and magnetic core is one of its two big critical component.Usually require magnetic core to have following characteristic: 1) low remanence strength Br; 2) low coercivity H; 3) good frequency characteristic; 4) high saturated magnetic strength Bs; 5) good manufacture craft performance.
The available technology adopting of magnetic compensation formula Hall current sensor be the permalloy tape wound core that contains Ni80% that provides by West Germany, tape thickness is about 0.1mm.Through annealing--after dipping lacquer solidifies, its magnetic levels is: Bs0.8T, Br0.24T, Hc2.1A/m (0.0260e) carries out the air gap cutting to magnetic core then, the hall device of packing into uses, because band is thicker, high-gradient magnetism is relatively poor, and this has limited this improvement of transducer response time, its remanent magnetism Br and Hc are all bigger, have reduced the precision of transducer.In addition, as the soft magnetism band around the cutting magnetic core, in the prior art, also can adopt amorphous cutting magnetic core, patent CN1050108A for example, used Fe-based amorphous tape wound core, solidify the cutting method for making through annealing and epoxy perfusion, be used for power supply inductance magnetic device, because patent CN1050108A has adopted the Fe-based amorphous composition of ni content 0～4% (at), though Bs is higher, but Br and Hc value are also very high, respectively greater than 0.8T and 6.4A/M, and the magnetic after solidifying produces serious deterioration, and is not suitable for the requirement of Hall current sensor to its magnetic core.Though in recent years the development of power electronic technology, the TT﹠C requirement of high frequency, non-sinusoidal waveform electric current is increased gradually.Therefore need a kind ofly have better frequency characteristic, lower remanent magnetism and coercitive cutting magnetic core to satisfy the requirement of novel sensor.
This transducer that sell the domestic and international market is produced by Switzerland LAM company, provides the perm magnetic core by West Germany entirely, does not find to use in Hall current sensor the patent and the report of non-crystaline amorphous metal magnetic core so far.About traditional sensors in Vo1.9.No.8 (1989), 48, the quick man of straight well, mulberry field are good bright, in " wooden youngster's sub-prime type high-precision current " technology report are arranged.
The objective of the invention is to replace traditional permalloy magnetic core with amorphous iron core, and make band around cutting magnetic core to overcome the shortcoming of Fe base amorphous by the adjustment of amorphous component, improve the precision and the high frequency characteristics of transducer, and raising processing performance, reduce the deterioration tendency of solidifying, be applicable to production in enormous quantities magnetic.
Summary of the invention comprises: the chemical composition of non-crystaline amorphous metal (at%) is:
FezNiyMxSi7-10B12-15 (wherein M is Mo or Mn), 0.5＜X≤5,32＜Y≤40, z is a surplus, this non-crystaline amorphous metal has good high-frequency soft magnetic performance and belt making process performance, can reach Hc＜1.6A/M under the annealing conditions of routine, Bs reaches 0.9T, saturated bysteresis coefficient of dilatation 10 * 10
-6Resistivity is 1.35 μ Ω .m.
The present invention adopts vacuum induction furnace smelting and casts bar-shaped mother metal, makes the amorphous band that requires width with single-roller method, is wound into annular or track-shaped magnetic core then.
The magnetic core of mentioned component can be undertaken by following annealing process:
Horizontal magnetic anneal, 400～430 ℃ of annealing temperatures, it is cold to be incubated 10～30 minutes stoves, and magnetic field intensity is greater than 1600A/M.The purpose of horizontal magnetic anneal is in order to reduce Br and to improve frequency characteristic.
A/m。The purpose of horizontal magnetic anneal is in order to reduce Br and to improve frequency characteristic.
Magnetic core after the annealing is cured processing, can adopts encapsulating method, also can adopt the method for encapsulation.Use low stress half flexible-epoxy to pour into, its formula components is:
Kind allocation ratio (weight)
Epoxy resin 100
Curing agent (anhydrides etc.) 8～16
Increase sword agent (poly-S rubber etc.) 5～30
Extender (Si micro mist etc.) 30～50
Solidifying stoving process is 150 ℃, 3 hours
Magnetic core after solidifying is cut into the size of gaps of required size with emery wheel slicing machine or wire cutting machine, so that put into the Hall semiconductor device.Above technology can guarantee not produce resin cracks in cutting process, takes off between belt to split and defectives such as air gap distortion.
Reach advantage compared with the prior art: now in magnetic and process aspect following difference is arranged with permalloy magnetic core and magnetic core of the present invention:
(1) now adopt the permalloy that contains Ni80% with magnetic core, the present invention adopts Fe-Ni base amorphous magnetic core.
(2) the present invention adopts process annealing (400～450 ℃), does not need coating, and the processing cycle is short, and not tight to the requirement of protection gas, technology is simple.(1050 * 4hr), its annealing operation is very complicated and now must adopt conventional insulation electrophoretic coating and high temperature to anneal often with the perm magnetic core.
(3) the present invention adopts epoxy resin enclosed curing, and now adopts dipping paint method with the perm magnetic core.Former approach can guarantee that soft magnet performance changes not quite after solidifying, and the latter then makes magnetic property descend greatly.For example concerning coercivity H, magnetic core of the present invention increases by 0～30% after solidifying, and now generally is increased to 400% with technology.
(4) dc magnetic of magnetic core before and after the cutting, both can do following comparison:
Table 1 is for solidifying the preceding magnetic core DC performance of back cutting relatively.Fig. 1 is then for cutting the contrast of back magnetic core magnetic hysteresis loop.(a) is magnetic core of the present invention among Fig. 1; (b) for now using the perm magnetic core.This shows that magnetic core of the present invention has the low advantage of Bs height, Br and Hc, and the linearity of curve is higher, is more suitable in Hall current sensor.
(5) about high frequency characteristics:
Under the state after curing before the cutting to magnetic core of the present invention with now carried out frequency characteristic comparison with the perm magnetic core, make electric bridge method, under Bm=5mT magnetic strength condition, measured of the variation of the elastic magnetic inductivity of two kinds of magnetic cores with operating frequency, the Dispersion of its magnetic permeability is shown in table 2, is begun obviously to descend from the 10KHz frequency by the visible traditional perm magnetic core of table.When 50KHz, magnetic permeability has been lower than 1000, only reduces by 18% and magnetic core of the present invention rises to the 150KHz magnetic permeability by 10KHz, and this magnetic core is particularly suitable for the observing and controlling to high-frequency current voltage.
Table 1: solidify the preceding magnetic core DC performance of back cutting relatively
| Now use perm Ni80 | The present invention | |
| Bs(T) | 0.8 | 0.9 |
| Br(T) | 0.24 | 0.07 |
| Hc(A/m) | 2.1 | 2.1 |
Table 2: the Dispersion that cuts the elastic magnetic inductivity of preceding two kinds of magnetic cores
| Frequency KHz | 10 | 20 | 50 | 70 |
| Now use perm Ni80 μ | 2850 | 1670 | 876 | 694 |
| Magnetic core μ of the present invention | 5104 | 5030 | 4087 | 4760 |
| Frequency KHz | 100 | 120 | 150 | 200 |
| Now use perm Ni80 μ | 548 | 492 | 417 | ** |
| Magnetic core μ of the present invention | 4560 | 4420 | 4190 | 3860 |
Further specify technical scheme of the present invention below by embodiment 1.
The present invention adopts vacuum induction furnace smelting chemical composition (at%) to be: the mother metal of Fe38Ni38Mn2Si8B14, and adopt single-roller method to make the wide amorphous band of 10mm, be wound into the magnetic core of Φ 18/ Φ 24 * 10mm.Carry out horizontal magnetic anneal, magnetic field intensity 1600A/M then.Adopt 410 ℃, 10 minutes annealing back stoves cold, magnetic core with the epoxy resin enclosed overall dimensions of making Φ 15/ Φ 26 * 11.5mm, is cut the wide gap of 1.8mm on the emery wheel slicing machine.Obtain the direct current magnetic hysteresis loop as shown in Figure 1.Its average magnetic permeability is 125mH/M, and the static magnetic field when reaching capacity is 40AT/cm.
Make the magnetic compensation formula Hall current sensor that the rated quantity electric current is 100A (50Hz) with this magnetic core, the result shows, its certainty of measurement＜1%, and measuring range expands to 0～150A, and the response time is satisfied instructions for use less than 1 μ S.
Claims (2)
1, a kind of soft magnetic amorphous cutting magnetic core method for making that is specially adapted to magnetic compensation formula Hall current sensor, adopt single-roller method to make amorphous band, coiled annular or track-shaped magnetic core, magnetic core carries out horizontal magnetic anneal, again through the cured moulding, carry out the air gap cutting at last, it is characterized in that chemical composition (at%) is:
FezNiyMxSi7-10B12-15 (wherein M is Mo or Mn), 0.5＜X≤5,32＜Y≤40, z is a surplus, horizontal magnetic anneal technology is: 400～430 ℃ of annealing temperatures.
2, method for making according to claim 1 is characterized in that, horizontal magnetic anneal technology is: it is cold to be incubated 10～30 minutes stoves, and the aspect, magnetic field is along the band horizontal direction, and magnetic field intensity is greater than 1600A/M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91111757 CN1031848C (en) | 1991-12-29 | 1991-12-29 | Production of amorphous magnetic core for magnetic-compensation Hall current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91111757 CN1031848C (en) | 1991-12-29 | 1991-12-29 | Production of amorphous magnetic core for magnetic-compensation Hall current sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1069823A CN1069823A (en) | 1993-03-10 |
| CN1031848C true CN1031848C (en) | 1996-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91111757 Expired - Fee Related CN1031848C (en) | 1991-12-29 | 1991-12-29 | Production of amorphous magnetic core for magnetic-compensation Hall current sensor |
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| Country | Link |
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| CN (1) | CN1031848C (en) |
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|---|---|---|---|---|
| CN100490028C (en) * | 2005-12-07 | 2009-05-20 | 安泰科技股份有限公司 | Block-shaped soft magnetic alloy lamination element and its manufacturing method |
| CN102737829B (en) * | 2012-06-21 | 2014-03-12 | 四川大学苏州研究院 | Heat treatment process of low-loss amorphous alloy iron core for transformer |
| CN103969488B (en) * | 2013-01-31 | 2017-09-29 | 西门子公司 | Current transformer and its current detection circuit |
| CN103258612B (en) * | 2013-05-22 | 2017-07-21 | 安泰科技股份有限公司 | A kind of low magnetic conduction magnetic core and its manufacture method and purposes |
| CN105580095B (en) * | 2013-08-13 | 2017-07-18 | 日立金属株式会社 | Fe bases amorphous transformer core and its manufacture method and transformer |
| CN104200982A (en) * | 2014-03-28 | 2014-12-10 | 北京冶科磁性材料有限公司 | Manufacturing method of nanocrystalline magnetic core for high-frequency electrostatic dust collection power transformer |
| CN106916928A (en) * | 2015-12-24 | 2017-07-04 | 上海光线新材料科技有限公司 | A kind of amorphous or the heat treatment method of nanocrystalline material for magnetic screen piece |
| CN107190135A (en) * | 2017-06-02 | 2017-09-22 | 深圳市信维通信股份有限公司 | A kind of magnetic field heat treatment process of amorphous or nanocrystalline shielding piece |
| CN108329021A (en) * | 2017-12-25 | 2018-07-27 | 日照亿鑫电子材料有限公司 | Low-frequency current sensor core material and preparation method thereof |
| CN110160693A (en) * | 2019-07-08 | 2019-08-23 | 无锡集磁科技有限公司 | The measuring method of orientation silicon steel magnetic core resin solidification stress |
| CN111235495B (en) * | 2020-02-21 | 2022-10-04 | 中国电力科学研究院有限公司 | Amorphous nanocrystalline alloy, iron core manufacturing method and wide-range current transformer measuring method |
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1991
- 1991-12-29 CN CN 91111757 patent/CN1031848C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1069823A (en) | 1993-03-10 |
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Assignee: Beijing Shougang Co., Ltd. Assignor: Capital Iron & Steel General Company Contract fulfillment period: In May 5, 2017, 15 years, the patent expires Contract record no.: 200210042 Denomination of invention: Fabrication of amorphous magnetic core for magnetic compensated Holzer current sensor Granted publication date: 19960522 License type: Exclusive Record date: 20020603 |
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Free format text: LICENCE; TIME LIMIT OF IMPLEMENTING CONTACT: 2017.5.5, 15 YEARS, EXPIRATION OF PATENT RIGHT Name of requester: BEIJING SHOUDU STEEL CO., LTD. Effective date: 20020603 |
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