CN1440040A - Permanent magnet mechanism for generating remanent density of magnet field as times as that of common permanent materials - Google Patents
Permanent magnet mechanism for generating remanent density of magnet field as times as that of common permanent materials Download PDFInfo
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- CN1440040A CN1440040A CN 03111030 CN03111030A CN1440040A CN 1440040 A CN1440040 A CN 1440040A CN 03111030 CN03111030 CN 03111030 CN 03111030 A CN03111030 A CN 03111030A CN 1440040 A CN1440040 A CN 1440040A
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- 230000007246 mechanism Effects 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 title claims abstract description 6
- 239000000696 magnetic material Substances 0.000 claims abstract description 36
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 8
- 239000010935 stainless steel Substances 0.000 claims abstract description 8
- 230000005415 magnetization Effects 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 229910001172 neodymium magnet Inorganic materials 0.000 claims abstract description 6
- 150000002739 metals Chemical class 0.000 claims 2
- 230000004907 flux Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 description 13
- 230000005389 magnetism Effects 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 108010010803 Gelatin Proteins 0.000 description 2
- 230000004323 axial length Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229920000159 gelatin Polymers 0.000 description 2
- 239000008273 gelatin Substances 0.000 description 2
- 235000019322 gelatine Nutrition 0.000 description 2
- 235000011852 gelatine desserts Nutrition 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000002964 excitative effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003574 free electron Substances 0.000 description 1
- 230000002068 genetic effect Effects 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
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Abstract
本发明涉及一种强磁场永磁机构，其结构中永磁材料部分由8～64块梯形截面的钕铁硼永磁块组成，每个相邻永磁块的充磁方向依次相差360°/n度角，整个磁体的截面积为正n边形(n为8～64)，在水平方向和垂直方向上的45°角度范围内永磁块的中间为工业纯铁，靠近中心位置，在水平方向上放置的软磁材料为非磁性金属，非磁性不锈钢或铝，中心部分包围的区域为气隙，为强磁场工作空间，各组件用胶粘合成为中空的正八棱柱，最外面用非磁性金属外壳卡紧固定。优点：结构简单，制作容易，利用软磁材料工业纯铁和非磁性金属不锈钢，磁通密度达到永磁材料本身剩磁磁密3倍以上，对于钕铁硼永磁材料，磁密可达4T左右，可广泛应用于各种技术领域中。
The invention relates to a strong magnetic field permanent magnet mechanism, in which the permanent magnet material part is composed of 8 to 64 NdFeB permanent magnet blocks with trapezoidal cross-section, and the magnetization direction of each adjacent permanent magnet block is sequentially different by 360°/ At an angle of n degrees, the cross-sectional area of the entire magnet is a regular n-gon (n is 8 to 64), and the middle of the permanent magnet block is industrial pure iron within the angle range of 45° in the horizontal and vertical directions, near the center. The soft magnetic material placed in the horizontal direction is non-magnetic metal, non-magnetic stainless steel or aluminum. The area surrounded by the central part is an air gap, which is a working space for a strong magnetic field. The magnetic metal case snaps on and stays in place. Advantages: simple structure, easy to manufacture, using soft magnetic materials industrial pure iron and non-magnetic metal stainless steel, the magnetic flux density reaches more than 3 times the remanence magnetic density of the permanent magnetic material itself, and the magnetic density can reach 4T for the NdFeB permanent magnetic material It can be widely used in various technical fields.
Description
Technical field
The present invention relates to a kind of strong magnetic field permanent magnetic mechanism.
Background technology
According to the electromagnetism basic theories, charged particle will be subjected to the effect of Lorentz force when moving in magnetic field, therefore the motion path of charged particle beam can be controlled in the magnetic field of appropriate design, this principle is widely used in the systems such as travelling wave tube, magnetron, klystron, free-electron laser, bevatron and cathodic sputtering, in high-energy physics experiment, magnetic separation, controlling plasma, medical science diagnosis and treatment and some military equipment, often utilize deflection of high-intensity magnetic field controlling electron beam and focusing.The intensity that strengthens magnetic field is one of important goal of magnetic field application technology, in recent years, generally adopts superconducting coil to produce high-intensity magnetic field, though can reach the purpose that produces high-intensity magnetic field, but being superconducting apparatus, insufficient part needs huge cooling system, difficult in maintenance, and the cost costliness; In medical applications, the used helium of its cooling system also can cause harmful environment, if can adopt permanent magnet in the space of charging particle movement, to produce the magnetic field of IT-4T, thereby in the magnetic field range of this intensity, replace superconducting apparatus, just can reduce equipment cost greatly, this will be with a wide range of applications.
Forefathers have proposed a kind of special permanent-magnet structure, set of permanent magnets by piecemeal becomes spheroid or cylinder, be called magic ball and evil spirit ring, the magnetizing direction of each permanent magnets is pressed the certain angle difference and is changed, to produce all uniform magnetic fields of basically identical of direction and size in the cavity in the middle of spheroid or cylinder, the size of its magnetic flux density is
B wherein
rFor the remanent magnetism magnetic of permanent magnetic material close, R
1And R
2Represent its internal diameter and external diameter respectively, for magic ball k=4/3, for evil spirit ring k=1.
In theory, according to top formula, as long as the unlimited ratio that increases external diameter and internal diameter, above-mentioned permanent-magnet structure just can produce infinitely-great field intensity, but actual conditions are really not so, on the one hand, with the external diameter of bewitched ring and internal diameter than (R
2/ R
1) constantly increase, the volume and weight of magnet increases rapidly too, this makes the cost of making magnet increase sharply, the more important thing is, when internal air gap magnetic field constantly strengthens and during greater than the strong power of permanent magnetic material, degaussing just takes place in part near air gap in the magnetizing direction permanent magnets opposite with air-gap magnetic field direction inevitably, the degaussing phenomenon makes the magnetic of permanent magnet produce irreversible damage, thereby make the air gap field intensity can't reach the size and the uniformity of expection, in addition, the high-intensity magnetic field identical with the permanent magnet magnetizing direction will cause the saturated phenomenon of permanent magnetic material, this will cause the working point of permanent magnetic material to be in the first quartile of its magnetic hysteresis loop rather than second quadrant of normal operating conditions, simultaneously, because each permanent magnets magnetizing direction is all inequality, there are sizable repulsive force or attraction to each other, and magnetic field is strong more, magnetic force is just big more, be not easy to realize the bonding of each permanent magnets and assembling more, because these analyses, many difficult problems on designing technique and the manufacturing process make that adopting permanent magnet to produce high-intensity magnetic field is difficult to realize.
Summary of the invention
For increasing the magnetic field intensity that permanent magnet produced, purpose of the present invention provides a kind of can produce the permanent magnet mechanism that is several times as much as the close high-intensity magnetic field of the remanent magnetism magnetic of permanent magnetic material own.This special permanent magnet mechanism utilizes soft magnetic material to combine with permanent magnetic material and forms, and can produce magnetic flux density and reach the close high-intensity magnetic field more than 3 times of the remanent magnetism magnetic of permanent magnetic material own in working space.
The structural design that the present invention produces the permanent magnet mechanism of high-intensity magnetic field is achieved in that permanent magnet forms (as shown in Figure 1) by the Nd-Fe-B permanent magnetic piece of 8～64 trapezoid cross sections, the magnetizing direction of each permanent magnets has nothing in common with each other, the magnetizing direction of adjacent magnetic patch differs 360 °/n degree angle (n is the permanent magnets number) successively, the sectional area of whole magnet is a positive n limit shape (n equals 8～64), in the horizontal direction with vertical direction on 45 degree scope in the mid portion of permanent magnets embed soft magnetic material, be nonmagnetic metal near center of circle part in the horizontal direction, be in non-magnetic stainless steel (or aluminium), the little polygon institute area surrounded of core is an air gap, be the high-intensity magnetic field working space, each assembly is fixed with nonmagnetic metal shell chucking with the bonding positive polygon prism that becomes hollow of special gelatin, outermost.
Wherein, the high-intensity magnetic field permanent magnet can produce magnetic flux density and equal the close uniform magnetic field more than 3 times of permanent magnetic material remanent magnetism magnetic in working space, axially (promptly perpendicular to the paper direction) length is long more, then the magnetic field of working space is even more, when adopting Nd-Fe-Bo permanent magnet material, working space magnetic is close to be reached about 4T;
The magnetizing direction of each magnetic patch has nothing in common with each other, the magnetizing direction of adjacent magnetic patch differs 360 °/n angle successively, shown in the arrow among Fig. 2, n=8 among Fig. 2, magnetizing direction difference angle successively is 45 °, the cross sectional shape of whole magnet is a positive n limit shape, in the horizontal direction with vertical direction on 45 degree scope in the mid portion of permanent magnets embed soft magnetic material, be Armco iron, its size is identical in twos, is installed near the center, as dash area among Fig. 2, have 4 blocks of soft magnetic materials this moment, the soft magnetic material of Fang Zhiing is a nonmagnetic metal near center of circle part in the horizontal direction, is non-magnetic stainless steel, the little octagon institute area surrounded of core is an air gap, be the high-intensity magnetic field working space, each assembly is fixed with nonmagnetic metal shell chucking with bonding positive eight prisms that become hollow of special gelatin, outermost.
The soft iron part can be made arc-shaped curved surface rather than plane towards the surface of air gap, can improve the uniformity of air gap internal magnetic field.
Advantage of the present invention: simple in structure, fabrication and installation are easy, utilize soft magnetic material Armco iron and nonmagnetic metal stainless steel to be embedded in the permanent magnet, can increase the magnetic field intensity that is produced, working space magnetic is close surpass permanent magnetic material remanent magnetism magnetic close more than 3 times, when using Nd-Fe-Bo permanent magnet material, magnetic flux density can reach about 4T, can be widely used in Medical Devices and some military equipment.
Description of drawings
Fig. 1 is the permanent magnet mechanism principle schematic of high-intensity magnetic field;
Fig. 2 and Fig. 3 are the permanent magnet mechanism structural representation of high-intensity magnetic field of the present invention;
Fig. 4 is the permanent magnet mechanism dimensional structure figure of high-intensity magnetic field of the present invention;
Fig. 5 is the magnetization curve figure of the permanent magnet mechanism Armco iron DT4 of high-intensity magnetic field of the present invention;
Fig. 6 is the magnetic line of force distribution map of the permanent magnet mechanism of high-intensity magnetic field of the present invention;
Fig. 7 is the permanent magnet mechanism central area magnetic line of force distribution map of high-intensity magnetic field of the present invention;
Near when Fig. 8 is the plane for the permanent magnet mechanism soft magnetic material end face of high-intensity magnetic field of the present invention the air gap magnetic line of force distribution map;
Near when Fig. 9 is the plane for the permanent magnet mechanism soft magnetic material end face of high-intensity magnetic field of the present invention the air gap the close size distribution figure of magnetic;
When Figure 10 is the permanent magnet mechanism arc-shaped curved surface of high-intensity magnetic field of the present invention, near the magnetic line of force distribution map the air gap;
When Figure 11 is the permanent magnet mechanism arc-shaped curved surface of high-intensity magnetic field of the present invention, near the close size distribution figure of magnetic the air gap.
Embodiment
The present invention's embodiment and operation principle are illustrated in conjunction with the accompanying drawings.
Its structure is that 8 magnetic patch are formed by shown in Figure 2, among the figure: 1 Nd-Fe-B permanent magnetic piece, 2,3,4,5 is soft magnetic material, Armco iron, 6,7 is nonmagnetic metal, non-magnetic stainless steel, 8 is the high-intensity magnetic field working space of hollow, 9 is the nonmagnetic metal shell.
The magnetizing direction of each magnetic patch is by shown in Figure 3, differ 45 successively, if a plurality of magnetic patch, magnetizing direction differs 360 °/n degree successively, n is an even number permanent magnets number, wherein one of embodiment size as shown in Figure 4, whole magnetic patch width is 414.20mm, work cavity internal diameter 24.2mm, axial length is 85mm, because above-mentioned high-intensity magnetic field permanent magnet is combined by soft magnetic material and permanent magnetic material, the magnetic characteristic of soft magnetic material is non-linear (magnetization curve as shown in Figure 5), therefore be difficult to obtain the analytic solutions of its Distribution of Magnetic Field,, need to adopt and tie the shaped position optimization method mutually with the magnetic field numerical analysis in order to carry out the optimal design of this magnet.The computer software that the present invention adopts Finite Element Magnetic Field Analysis and genetic algorithm, compound method to combine is obtained optimizing design scheme.
The effect of soft magnetic material: the magnetic permeability of soft magnetic material is thousands of times of permanent magnetic material, and it act as and converges the magnetic flux that permanent magnets produces, the magnetic field that strengthens the air gap part, and attraction weakens the effect of demagnetizing field near the air-gap flux of magnetic pole pole-face with this.When working space magnetic is close when reaching 4T, some the part magnetic in the soft iron is close also will to be reached more than the 4T.This is because but in permanent-magnet structure shown in Figure 2, the special construction owing to permanent magnets has produced very strong magnetic field intensity in the part, is equivalent to very high excitatory ampere-turn, just causes the local high-magnetodensity of soft iron material naturally.
Wherein Fig. 2 and Fig. 3 are the permanent magnet mechanism structural representation of high-intensity magnetic field of the present invention, and the permanent magnets number equals 8 among the figure; Fig. 4 strong magnetic field permanent magnetic mechanism size is given an example, (service area cavity internal diameter: 24.2mm, axial length: 85mm); The magnetization curve figure of Fig. 5 Armco iron DT4; The magnetic line of force distribution map of Fig. 6 strong magnetic field permanent magnetic mechanism; Fig. 7 high-intensity magnetic field permanent magnet central area magnetic line of force distribution map; Near when Fig. 8 soft magnetic material end face is the plane air gap magnetic line of force distribution map; Near the distribution map of the close size of magnetic air gap when Fig. 9 soft magnetic material end face is the plane, white portion is a homogeneity range in the working region; Near when Figure 10 soft magnetic material end face is arc-shaped curved surface the air gap magnetic line of force distribution map; Near when Figure 11 soft magnetic material end face is arc-shaped curved surface the air gap the close distribution map of magnetic, white portion is a homogeneity range in the working region, the homogeneity range of comparing with Fig. 9 enlarges.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03111030 CN1217353C (en) | 2003-02-20 | 2003-02-20 | Permanent magnet mechanism for generating remanent density of magnet field as times as that of common permanent materials |
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|---|---|---|---|
| CN 03111030 CN1217353C (en) | 2003-02-20 | 2003-02-20 | Permanent magnet mechanism for generating remanent density of magnet field as times as that of common permanent materials |
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| CN1440040A true CN1440040A (en) | 2003-09-03 |
| CN1217353C CN1217353C (en) | 2005-08-31 |
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|---|---|---|---|
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1862718B (en) * | 2005-05-09 | 2011-06-08 | 中国科学院电工研究所 | Bipolar permanent magnet |
| CN102456464A (en) * | 2010-11-05 | 2012-05-16 | 信越化学工业株式会社 | Dipole ring magnetic circuit |
| CN102628187A (en) * | 2012-01-04 | 2012-08-08 | 宁波大学 | Device for constraining complex crystal growth by strong magnetic field relying on magnetic circuit technological principle |
| CN104992892A (en) * | 2015-07-17 | 2015-10-21 | 中国工程物理研究院应用电子学研究所 | Permanent-magnet packaging relativistic magnetron |
| CN106772164A (en) * | 2016-12-20 | 2017-05-31 | 中国科学院电工研究所 | Nmr magnet with voluntarily temperature compensation function |
| CN108591346A (en) * | 2018-06-18 | 2018-09-28 | 北京光宇之勋科技有限公司 | A kind of combined type damping |
| CN111799055A (en) * | 2020-07-23 | 2020-10-20 | 苏州英磁新能源科技有限公司 | Magnetizing and using method of polygonal magnetic steel |
| CN112039309A (en) * | 2020-10-04 | 2020-12-04 | 西安航天动力测控技术研究所 | Magnetic circuit structure of a voice coil motor |
| CN112989643A (en) * | 2020-12-23 | 2021-06-18 | 珠海格力电器股份有限公司 | Permanent magnetic circuit design method |
| CN118571697A (en) * | 2024-07-03 | 2024-08-30 | 国网河北省电力有限公司保定供电分公司 | Optimization method and device for permanent magnet mechanism in circuit breaker |
-
2003
- 2003-02-20 CN CN 03111030 patent/CN1217353C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1862718B (en) * | 2005-05-09 | 2011-06-08 | 中国科学院电工研究所 | Bipolar permanent magnet |
| CN102456464A (en) * | 2010-11-05 | 2012-05-16 | 信越化学工业株式会社 | Dipole ring magnetic circuit |
| CN102628187A (en) * | 2012-01-04 | 2012-08-08 | 宁波大学 | Device for constraining complex crystal growth by strong magnetic field relying on magnetic circuit technological principle |
| CN104992892A (en) * | 2015-07-17 | 2015-10-21 | 中国工程物理研究院应用电子学研究所 | Permanent-magnet packaging relativistic magnetron |
| CN106772164A (en) * | 2016-12-20 | 2017-05-31 | 中国科学院电工研究所 | Nmr magnet with voluntarily temperature compensation function |
| CN108591346A (en) * | 2018-06-18 | 2018-09-28 | 北京光宇之勋科技有限公司 | A kind of combined type damping |
| CN108591346B (en) * | 2018-06-18 | 2024-10-25 | 南阳威奥斯图车辆减振器有限公司 | Combined damping mechanism |
| CN111799055A (en) * | 2020-07-23 | 2020-10-20 | 苏州英磁新能源科技有限公司 | Magnetizing and using method of polygonal magnetic steel |
| CN112039309A (en) * | 2020-10-04 | 2020-12-04 | 西安航天动力测控技术研究所 | Magnetic circuit structure of a voice coil motor |
| CN112989643A (en) * | 2020-12-23 | 2021-06-18 | 珠海格力电器股份有限公司 | Permanent magnetic circuit design method |
| CN118571697A (en) * | 2024-07-03 | 2024-08-30 | 国网河北省电力有限公司保定供电分公司 | Optimization method and device for permanent magnet mechanism in circuit breaker |
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| CN1217353C (en) | 2005-08-31 |
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