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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Abstract
A permanent magnetic mechanism with high-intensity magnetic field uses 8-64 pieces of permanent magnetic block in neodymium ferroboron with trapezoidal section to form the permanent magnetic material part of its structure as the magnetic charging direction of each adjacent permanent magnetic block will be in difference of 360 deg/n angle with the section area of the entire magnetic body to be n square (n referring to 8-64). There will be industrial pure iron at the middle of permanent magnetic block with in the range of 45 deg at direction of horizontal and vertical, soft magnetic material placed at horizontal direction near the centre will be nonmagnetic metal, stainless steel and aluminium as the area surrounded by the central part is air gap which is working space for high density magnetic field.
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.
Claims (3)
1, a kind of generation is several times as much as the permanent magnet mechanism of the close high-intensity magnetic field of the remanent magnetism magnetic of permanent magnetic material own, it is characterized in that permanent magnet is made up of the Nd-Fe-B permanent magnetic piece of 8～64 trapezoid cross sections, the magnetizing direction of each magnetic patch has nothing in common with each other, the magnetizing direction of adjacent magnetic patch differs 360 °/n degree angle successively, the sectional area of whole magnet is positive n limit shape (n is 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 Armco iron, be installed near the center, the soft magnetic material of Fang Zhiing is a nonmagnetic metal near center of circle part in the horizontal direction, be 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 glued positive eight prisms that become hollow, and outermost is fixing with nonmagnetic metal shell chucking.
2, by the described high-intensity magnetic field permanent magnet of claim 1, it is characterized in that permanent magnet is made up of the Nd-Fe-B permanent magnetic piece (1) of 8 trapezoid cross sections, the magnetizing direction of each magnetic patch has nothing in common with each other, the magnetizing direction of adjacent magnetic patch differs 45 successively, the sectional area of whole magnet is an octagon, the magnetic patch mid portion is soft magnetic material (2) at interval up and down, (3), (4), (5), be Armco iron, in the middle of four, measure-alike in twos, the left and right sides, position that is installed near the center is nonmagnetic metal (6) near center of circle part, (7), be non-magnetic stainless steel, the little octagon institute area surrounded of core is air gap (8), is the high-intensity magnetic field working space, each assembly is glued positive eight prisms that become hollow, and outermost is fixing with nonmagnetic metal shell (9) chucking.
3, by the described strong magnetic field permanent magnetic mechanism of claim 1, it is characterized in that 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.
Priority Applications (1)
| 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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Cited By (9)
| 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 | Voice coil motor magnetic circuit structure |
| 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 |
-
2003
- 2003-02-20 CN CN 03111030 patent/CN1217353C/en not_active Expired - Fee Related
Cited By (9)
| 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 | Voice coil motor magnetic circuit structure |
| 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 |
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| CN1217353C (en) | 2005-08-31 |
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